GRASSO Screw Comp_Product Information

7/21/2019 GRASSO Screw Comp_Product Information

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Refrigeration Division Grasso

2004/4 _040000_pi_sc__gbr_.doc

SCREW COMPRESSORS

Series SH, MC and LT

Product Information


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Copyright Grasso GmbH Refrigeration Technology

The contents of this documentation and the enclosed drawings, sketches and diagrams are intended only for plantusers and operating personnel. They may be neither duplicated nor divulged to third parties or firms withoutwritten consent.

The technical data, figures, dimensions and weights presented in the documentation may be more closely defined

or otherwise specified as a result of contractual agreement and are binding only after our confirmation in writing.The stipulations set forth in the contract have precedence over those in this documentation.

We reserve all rights to introduce technical modifications in the course of further development.


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GrassoRefrigeration Division

PRODUCT INFORMATION

SCREW COMPRESSORSDIRECTORY

03.2004/2 040 010gbr - 1/1

Introduction 040 015gbr

Philosophy of Series 040 040gbr

Product name 040 200gbr

Compressor Design Citeria 040 300gbr

Limits of Application 040 310gbr

Main Dimensions Series SH Types C, D 040 400gbr

Main Dimensions Series SH Types E, G 040 410gbr

Main Dimensions Series MC Types H, L, M, N 040 420gbr

Main Dimensions Series LT Types P, R, S, V, W, Y, Z, XA, XB, XC, XD 040 430gbr

Main Dimensions Series LT Types XE, XF 040 440gbr

Conditions for Refrigerant Connections 040 500gbr

Conditions for Lubricating Oil Connections 040 510gbr

Electric Connections 040 520gbr

Installation Conditions, Sound, Vibration 040 600gbr

Coupling Requirements 040 610gbrStarting Conditions 040 620gbr

Operational Monitoring 040 630gbr

Lubricationg Oils 040 721gbr

Hints for Selection of Refrigeration Oil 040 730gbr

P+I Diagrams Series SH, MC 040 800gbr

Series SH Overall Concept AISH02-1gbr

Description of Design AISH03-1gbr

Schematic Diagram, Connections AISH04-1gbr

Series MC Overall Concept AIMC02gbr

Description of Design AIMC03gbr

Connections, Oil Passage AIMC04gbr

Series LT Overall Concept AI_LT_02gbr

Description of Design AI_LT_03gbr

Connections Types P, R, S, T, V, W, Y AI_PY_04gbr

Connections Types Z, XA, XB, XC, XD, XE, XF AI_Z_XF_04gbr


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INTRODUCTION

SCREW COMPRESSORS

03.2002/1 040 015e - 1/2

SCOPE OF APPLICATION

The screw compressors are oil injected dual rotor

positive displacement machines.The machines are available as standard refrigerationcompressors for single-stage operation, as boosters aswell as heat pump compressors.

The compressors can be applied in cold storage houses,in food industry (slaughter houses, breweries, dairies,food- and vegetable processing), air conditioning,chemical and petrochemical industries, refrigerating,cooling and air conditioning plants onboard ships aswell as heat pump operation.

The refrigerants NH3, R22, R134a, R404A, R507 andrefrigerant mixtures can be used up to a dischargepressure of 362.5 psia (28 bar abs.).

For these refrigerants, lubricating oil is chosen inaccordance with data sheet 040 700e.

The compressors are directly driven by the electricmotor through a flexible coupling and are designed forspeeds of 50Hz and 60Hz.

Supply range

The whole supply range of screw compressors comprises19 types subdivided into the following 3 series:

Series SH, SemiPacks, including 4 types (C, D, E, G) witha theoretical swept volume ranging from 231 to372 m/h.

Series MC, Compact-Screw compressors, including4 types (H, L, M and N) with a theoretical swept volumeranging from 471 to 860 m/h.

Series LT, High Performance-Screw compressors,including 11 types (P, R, S, V, W, Y, Z, X,XB, XC, XD)with a theoretical swept volume ranging from 805 to5800 m/h.

The 3 series differ from each other in the degree ofintegrated functional components of the oil and

refrigerant circuits.The SemiPacks of the series SH are equipped with acheck valve on the suction and the discharge sides,respectively, a suction filter, an oil filter, an overflowvalve, an internal oil management system, a flanged oilpump, a coupling and coupling casing with a centringflange for flange-mounting motors as well as attachedsolenoid valves for capacity control and Vi adjustment.Variations of this are therefore possible. The finisheddesign will be specified on the ordering list.

The components of series MC - Compact-Screwcompressors - include an internal oil system, a flanged

oil pump, a check valve on the suction side, suctionfilter and attached solenoid valves for capacity controland Vi adjustment.

Series LT - High Performance Screw compressors -

require external filters and valves as well as a separateoil feed system (exception: types W, Z, XA, XB,XCand

XD with attached solenoid valves).

All compressors feature stepless capacity control andcan be provided with self-adjusting, variable volumeratios (parallel slides, system PS with series SH and MC;tandem slides, system TS with series LT). Compressorswith built-in Vifixed volume ratios 2.6 to 4.8 ie: 5.5 areavailable. The value Vi is calculated for the specificoperation condition in the compressor selectionprogram COMSEL.

All types are fitted with an economiser connection as

well as connections for refrigerant injection (liquidinjection) and for returning oil from the plant system.Compressors with high pressure ratios are equippedwith a self-adjusting system for vibrationfree partialload operation.

Before delivery, each compressor is subjected to a testrun with nitrogen in the pressure range of the futureapplication which is proven by a works test certificateaccompanying each compressor. On request, acertificate of acknowledged classification societies, e.g.TV, Lloyds Register of Shipping, Germanischer Lloyd,Norske Veritas, Bureau Veritas, will be provided.

A comprehensive quality assurance system based onDIN ISO 9001 and comprising all stages from design/development, manufacturing, assembly and testingthrough to customer service guarantees excellentquality of the Grasso Screw compressors.

The compressors are delivered without oil.

All connections are closed, and the compressors arefilled with dry nitrogen (0.2 psig.).

Each compressor comes complete with a users manualwith instructions on operation, installation,maintenance and repair and showing the set of toolsand spare parts required.


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INTRODUCTION

SCREW COMPRESSORS

040 015e - 2/2 03.2002/1

TECHNICAL FEATURES

RotorsThe rotors are made of forged tool steel. They aredesigned according to low energy consumption criteria(patented profile with optimised main dimensions). Theprimary rotor is driven by the motor, whereas thesecondary rotor is directly driven by the primary rotorby means of a thin oil film.

CasingsThe casings are made of laminated grey cast iron andcan be applied with discharge pressures up to 406.1psia (28 bar abs.).

StoringThe compressors of the series SH and MC arecompletely equipped with rolling bearings. Capacityimproving cylindrical-roller bearings for radial load andball bearings of angle-contact design for axial loadensure a nominal service life up to 100.000 operatinghours. A hydraulically loaded balance piston reducesaxial loads and increases the designed service life of thethrust bearings. In compressors of the series LT, low-wear friction bearings carry the radial loads of the rotorshafts on a thin oil film without contact, whereas theangle-contact ball bearings take the axial load.

Shaft sealingThe driven main shaft is sealed by means of a ringbearing oil seal with a rotating ring and a fixed ring(impregnated carbon/ steel). The seal is designed torelieve load variations whilst containing the oil chargeand the thin oil film between the rings results in a longservice life.

Capacity controlStepless adjustment of the hydraulic mechanism enablesboth the suction volumetric capacity to be changedwithin the full load range of the compressor from 100%to minimum capacity. Compressors with a variablevolume ratio operate according to a system ofcombined Vi partial-load control.

Position indicationFor positioning the hydraulic systems of the capacity controland the Vi adjustment, a hermetic path sensor is used whichprovides an output signal between 4 and 20mA.


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PHILOSOPHY OF SERIESSCREW COMPRESSORS

03.2002/1 040 040e - 1/2

231

265

321

372

471

544

690

860

805

1040

1290

1640

1940

2296

2748

3250

4150

4900

5800

0 1000 2000 3000 4000 5000 6000

C

D

E

G

H

L

M

N

P

R

S

V

W

Y

Z

a

b

g

d

Type swept volume in m/h

XA

XB

XC

XD

swept volume in m/h (at 50 Hz)

Series SH

SemiPacks

Series MC

Compact Screws

Series LT

High Performance


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GrassoGeschftsbereichKltetechnik

PHILOSOPHY OF SERIESSCREW COMPRESSORS

040 040e - 2/2 03.2002/1

SH - SEMIPACKS

extremly high degree of component integration,

exclusively antifrictional bearings,

Vi- , partload control (PS - system).

type swept volume in m/h(50 Hz)

swept volume in CFM(60 Hz)

C 231 164

D 265 188

E 321 228

G 372 264

MC - COMPACT-SCREW COMPRESSORS

high degree of component integration,

exclusively antifrictional bearings,

stepless Vi- , partload control (PS - system).

type swept volume in m/h(50 Hz)

swept volume in CFM(60 Hz)

H 471 335

L 544 387

M* 690 490N* 860 611

LT - HIGH PERFORMANCE SCREW COMPRESSORS

long life time for highest performance,

sleeve type for radial and ball type for thrustbearings,

stepless Vi- and partload control (TS - system).

Typ swept volume in m/h(50 Hz) swept volume in CFM(60 Hz)

P 805 572

R 1040 739

S 1290 917

V 1640 1165

W 1940 1378

Y 2296 1632

Z 2748 1953

XA 3250 2309

XB 4150 2949

XC 4900 3482XD 5800 4122


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PRODUCT NAME

SCREW COMPRESSORS

03.2002/1 040 200e - 1/5

Name X - 9 (Z)

Screw Compressor Type

Screw Compressor Vi Version

Coupling Type(only for screw compressor types C, D, E, G)

X Screw Compressor Type

Series Code letter Theoretical swept volume at2940 rpm in m/h*) Series Code letter Theoretical swept volume at2940 rpm in m/h*)

SH C 231 LT P 805D 265 R 1040E 321 S 1290G 372 V 1640

W 1940MC H 471 Y 2296

L 544 Z 2748M 690 XA 3250N 860 XB 4150

XC 4800*)50Hz power system; for a 60Hz system, multiply the values by 1.2. XD 5800

9 Screw Compressor Vi Version

key number

1 Standard refrigeration compressor Vi =2.6




5 Standard refrigeration compressor Vi =variable

SH series

51 Vi =2.6/4.8 stepped



MC series

5 Vi =2.6...5.5 stepless

LT series51 Vi =2.2...4.0 stepless



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PRODUCT NAME

SCREW COMPRESSORS

040 200e - 2/5 03.2002/1

6 Booster application

61 Vi =2.6

62 Vi =3.6

7 Heat pump compressor

Vi - fixed

71 Vi =2.6

72 Vi =3.6

Vi - variable

SH series

751 Vi =2.6/4.8 stepped

752 Vi =2.6/4.0 stepped

MC series


LT series

751 Vi =2.2...4.0 stepless

8 Commercial refrigeration compressor LH series in 2 rating classes 50% and 100%

81 Vi =2.6

82 Vi =3.683 Vi =4.8

9 Speed controlled refrigeration compressor

SH series only type G


MC series only type N stepless

95 Vi =2.6...5.5

Examples of designation

P - 61 Screw compressor 805m/h (P), Booster with an internal volume ratio Vi=2.6 (61)

C-2(E) Screw compressor 231m/h (C), internal volume ratio Vi=3.6 (2), coupling housing withcoupling for KN7 225M - 75kW electric motor (E)


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PRODUCT NAME

SCREW COMPRESSORS

03.2002/1 040 200e - 3/5

(Z) Coupling Type (coupling housing with coupling)for screw compressor types C, D, E, G only

Electric flange motor, type IM B 5 *) coupling type

manufacturer output in kW name enclosure sc type C/D sc type E/G

Siemens AG 15 160M 1LA5 IP 54 A M

18,5 160L 1LA5

22 180M 1LA6 B N

30; 37 200L 1LA6 C P

45 225M 1LA6 D R

55 250M 1LA6 E S

75 280S 1LA6 F T

90 280M 1LA6110 315S 1LA6 - U

132 315M 1LA6

150 1PL6186-4HL - W/1Speed controlled

ABB 75, 90 250 SA2 IP 23 K

110 250 MA2 - U

132 280 SMA2

55 M2BA 250 SMA IP 55 E -

75 280 SA F T

90 280 SMA110 315 SA - U

132 315 SMA

Leroy Somer 15 P160MG IP 23 G V

18,5 P160L

30 P180M C P

37 P180L

55 PLS200LP H W

75 P225M E S

90 P250S

110 P250M - U

132 P280M

15 LS 160M IP 55 A M

18,5 LS 160L

22 LS 180MT B N

30 LS 200LT C P

37 LS 200L

55 LS 250MP F S

75 LS 280 SP/MP T

110 LS 315 SP/MP - U


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PRODUCT NAME

SCREW COMPRESSORS

040 200e - 4/5 03.2002/1

Electric flange motor, type IM B 5 *) coupling type

manufacturer output in kW name enclosure sc type C/D sc type E/G

AEG 30 KN7 180M IP 23 C P

(Schorch) 37 KN7 180L

45 KN7 200M H W

55 KN7 200L

75 KN7 225M E S

90 KN7 250S

110 KN7 250M

132 KN7 280M- U

22 KA7 180M IP 54 B N

30 KA7 207L C P

37 KA7 200L

45 KA7 225M D R

55 KA7 250M E S

75 KA7 280S F T

90 KA7 280M

110 KA7 315S - U

132 KA7 315M

Frank & Dvorak 15 160 MB IP 55 A M

18,5 160 L

22 180 M B N

30 200LA C P

37 200LB

45 225M D R

55 250M E S

75 280S F T

90 280M

VEM 15 K11R 160MX2 IP 55 A M

18,5 K11R 160 L2

22 K11R 180 M2 B N

30 K11R 200 L2 C P37 K11R 200 LX2

45 K11R 225 M2 D R

55 K11R 250 M2 E S

75 K11R 280 S2 F T

90 K11R 280 M2

110 K11R 315 S2 - U

132 K11R 315 M2

WEG 75 225 S/M IP 23 - S

special request Z Z

*)according to IEC standard 34-7; type IM B 35 (flange motor with mounting feet) may also be used.


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PRODUCT NAME

SCREW COMPRESSORS

03.2002/1 040 200e - 5/5

coupling type

manufacturer output in PS name enclosure sc type C/D sc type E/G

USA 40 40HP - 286 TS IP 23 D/1 R/1

(Nema-face) 50 50 HP 324 TS

60 60 HP 326 TS

75 75 HP 364 /5 TS D/2 R/2

100 100 HP 364 / 5TS

125 125 HP 404 / 5TS

USA 50

RAM Industries 60

(C-face) 75 E/ FES S/ FES

100125

150


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COMPRESSOR DESIGN CRITERIA

SCREW COMPRESSORS

03.2002/1 040 300e - 1/1

compressortype

theoreticalswept vol.

ZM/ZF Vi-adjustment Vi-Version compressorequipment

bearingradial/ axial

oilsupply

drivemotor

m/h(0) (1) (2) (3) (4) (5) (6) (7)

C 231 5/6 PS2 1235678 D W/W O F

D 265 5/6 PS2 1235678 D W/W O F

E 321 5/6 PS2 1235678 D W/W O F

G 372 5/6 PS2 12356789 D W/W O F

H 471 5/6 PS0 123567 C W/W O E

L 544 5/6 PS0 123567 C W/W O E

M 690 5/6 PS0 123567 C W/W O E

N 860 5/6 PS0 1235679 C W/W O E

P 805 5/6 TS0 1234567 A G/W M E

R 1040 5/6 TS0 1234567 A G/W M ES 1290 5/6 TS0 1234567 A G/W M E

V 1640 4/6 TS0 123567 A G/W M E

W 1940 5/6 TS0 1234567 B G/W M E

Y 2296 4/6 TS0 123567 A G/W M E

Z 2748 5/6 TS0 123567 B G/W M E

XA 3250 5/6 TS0 123567 B G/W M E

XB 4150 5/6 TS0 1234567 B G/W M E

XC 4900 5/6 TS0 1234567 B G/W M E

XD 5800 5/6 TS0 1234567 B G/W M E

(0) at 2940rpm (50Hz power system; for a 60Hz power system, multiply values by 1.2

(1) ZMZF

numbers of lobes, male rotornumbers of lobes, female rotor

(2) PS parallel slide system, PS0: stepless Vi-adjustmentPS2: 2-stage Vi- adjustment

TS tandem slide system TS0: stepless Vi-adjustment

(3) 12345678

9

Vi =2.6Vi =3.6Vi =4.8Vi =5.5Vi =variablebooster applicationheat pump compressorcommercial refrigeration compressor

speed controlled refrigeration compressor(4) A

BCD

standard equipment without additional componentssolenoid valves for capacity and Vi-adjustment on the compressorsolenoid valves, suction filter, check valve on the suction side, oil pump on the compressorsolenoid valves, suction filter, check valves (suction/ discharge sides), oil pump, overflow valves (suction/ discharge sides) onthe compressor

---- : underlined components are optional (operation with external pump is possible)

(5) WG

antifriction bearingssleeve bearings

(6) OM

compressor operation with flanged oil pump for capacity controlcompressor operation with external oil pump

(7) FE

flange motormotor and compressor installed separately


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LIMITS OF APPLICATION

SCREW COMPRESSORS

07.2003/2 040 310gbr - 1/1

The screw compressors can be operated under the mostvaried operation conditions within the given limits ofapplication according to the requirements involved. Thelimits of application listed below for the screw compres-sors are based on the operational principle of the screwcompressor and thermodynamic relations and are theresult of practical operating conditions and design.

The tabulated data apply for single, two-stage and heat-pump operation. The appropriate compressor modeldesign (1-7) should be selected for the particularoperating conditions *) Depending on the specificoperating conditions, there might occur reductions ofthe limits given in the table due to the CompressorSelection Programme COMSEL/GSCREW.

suction temperature compressor inlet t0h C min > - 60

discharge pressure (condensing pressure) p bar (a) max < 28

discharge temperature at compressor outlet te C max < 120

pressure ratio (p/p0) - min > 1,5

pressure difference (p - p0)

pbar min > 0,8

compressor type C / D E / G H / L M /N

maximum driving power (kW) 50 Hz60 Hz

105126

150180

200240

300360

maximum nominal torque Nm 350 500 640 960

maximum speed limits rpm 6.000 6.000 4.500 4.500

compressor type P R / S/ T V /W/ Y Z / XA XB, XC, XD XE, XF

maximum driving power (kW) 50 Hz60 Hz

330400

530640

9001080

12501500

18002160

30003600

maximum nominal torque Nm 1060 1700 2900 4020 5730 9500

maximum speed limits rpm 3.600 3.600 3.600 3.600 3.600 3.600

Instructions:

Minimal over-heating on suction side: wet operation to be avoided.

The minimum compressor discharge temperature te must be sufficientlyabove the oil temperature for supplyto the bearings for compressor with sleeve bearings.

Limits for temperature differences will be considered in COMSEL/GSCREW

Gas pulsation protection required for 8 only.

SH and MC series: Minimal speed control in integrated oil pump 2000 min -1

Rotation direction: view to compressors driving shaft: clockwise

For p= p-po 4 bar is an external oil pump to be taken into considerationFor operation conditions with speeds differing from 50 or 60 Hz, the manufacturer should be contacted

Comments :

1. For each individual application all conditions given in the tables should be taken into consideration andadhered to.

2. Should the given limit values be exceeded in any particular case, the manufacturer must be consulted.

3. In addition to the application limits given in the tables, consider the operating conditions which must beobserved for the corresponding type of the compressor (e.g. start-up regime, oil pressure, oil quantity etc.).

4. The oil temperature at the compressor inlet must be least 18C.

5. Ensure that the oil viscosity will be 7...70 cSt at n 2950 min-1for the oil supply to bearings. Take into

account the drop in viscosity due to refrigerant dissolved in the oil!

6. Economizer operation between the 100% and 85% control slide positions.


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MAIN DIMENSIONSSCREW COMPRESSORS

SH SERIES - SEMIPACKS, TYPES C, DFES DESIGN

040 400 2/2 Screws SH Series 09/2001 Rev.2

25

350

450

H1

492

285

135

190

D1

D2

280

257

110

51

Maindimensions

coupling housingwith coupling

Order No.

Booster

250165:28D50

High stage

250175:28D50

High stagespecial design250174:28D50

L1 (overall length) (mm) 918 [948] 910 [940]

L2 (mm) 381 373

L3 (mm) 381 [411] 383 [413]

B1 (overall width) (mm) 526 576

H1 (overall height) (mm) 510 560

D1 (locating flange-) (mm) 266,7 317,5 406,7

D2 (hole-circle-) (mm) 228,6 279,4 355,6

m (thread size) (mm) 15,5 17,5

n (number of bolts) 4 8

suction side DN80

N discharge side DN65

W supercharging DN25

refrigerant injection DN8

approx.weight, max. (kg) 328 [338] 364 [374] 368 [378]

[...] for screw compressor Type D


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SH SERIES - SEMIPACKS, TYPES E, G

09/2001 Rev.2 Screws SH Series 040 410e - 1/2

maindimensions

coupling housingwith coupling *) M; N P; V R W S; T U

l1 (overall length) (mm) 975 [1004] 1005 [1034]

l2 (mm) 362 392

l3 (mm) 432 [461] 462 [491]

b1 (overall width) (mm) 620 675

h1

(overall height) (mm) 595 615 670

d1 (locating flange-) (mm) 250 300 350 450 550

d2 (hole-circle-) (mm) 300 350 400 500 600

m (thread size) M16 M20


suction side DN 100

N discharge side DN 65

W supercharging DN 25

refrigerant injection DN 8

approx.weight, max. (kg) 412 [423] 418 [429] 423 [433] 442 [452] 438 [448] 461 [472]

[...] for screw compressor Type G*) see product name Data sheet 040 200E


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SH SERIES - SEMIPACKS, TYPES E, GFES DESIGN

040 410E - 2/2 Screws SH Series 09/2001 Rev.2

maindimensions

coupling housingwith coupling

order no.

Booster

250166:28G50

High stage

250177:28G50

High stagespecial design250176:28G50

L1 (overall length) (mm) 1005 [1034] 997 [1026]

L2 (mm) 392 384

L3 (mm) 395 [424] 397 [426]

B1 (overall width) (mm) 545 595

H1 (overall height) (mm) 510 560D1 (locating flange-) (mm) 266,7 317,5 406,7

D2 (hole-circle-) (mm) 228,6 279,4 355,6

m (thread size) (mm) 15,5 17,5


suction side DN100

N discharge side DN65

W supercharging DN25

refrigerant injection DN8

approx.weight, max. (kg) 451 [461] 509 [519] 513 [523]

[...] for screw compressor Type G


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MC SERIES, TYPES H, L, M, N

00.09 Screw MC Series 040 420e - 1/1

Type H L M N

theoretical swept volume in m/h 471 544 690 860

b1 425 510

b2 350 425

b3 109 138

b4 132 150

dm 18 22

h1 537 646

h2 215 270

h3 36 50

h4 23 26

l1 938 974 1094 1145

l2 350 386 406 457

l3 165 219

l4 245 296

l5 219 260

l6 60 55

l7 75 95

weight 366 381 660 690

nominal sizes suction side NB 125 NB 150

of connections discharge side NB 80 NB 100

supercharging NB 32 NB 40


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LT SERIES - TYPES P, R, S, T, V, W, Y, Z, XA, XB, XC, XD

07.2003/2 Screws LT Series 040 430gbr - 1/2

connectiosuperfee

suctio

liquiin ectio

discharg

female male

2

4

5** 1

h4

3

1

1

3

21

side

l4

l

e

b

rotor rotor

side

type P R S T V W Y

theoretical swept volume(in m/h)

805 1040 1290 1460 1640 1940 2296

b1 600 660 750

d1 26 26 26

d2 60 h6 60 h6 80 h6

e1 375 418 485 525 480 535 600

e2 500 566 600

e3 160 176,3 200

e4 170 195 200

e5** 250 283 300

h1 525 570 670

h2 290 330 350

h3 50 70 70

h4 110 130 145

l1 817 965 1085 1125 1040 1095 1160

l2 272 347 360

l3 95 115 130 105 130

l4 65 45 100

driving shaft HR* HR* HR*

nominal suction side DN 150 DN 175 DN 250

sizes of discharge side DN 100 DN 100 DN 150

connec- superfeed DN 32 DN 40 DN 65

tions liquid injection DN 15 DN 15 DN 15

weight: max [kg] 598 890 960 1060 1134 1195 1283

* male rotor** position discharge connection


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LT SERIES - TYPES P, R, S, T, V, W, Y, Z, XA, XB, XC, XD

040 430gbr - 2/2 Screws LT Series 07.2003/2

connection

superfeed

suction

liquid

injection

discharge

female male

2

4

5** 1

h4

3

1

1

3

21

side

l4

l

e

b

rotor rotor

side

type Z X XB XC XD

theoretical swept volume in m/h 2748 3250 4150 4900 5800

b1 760 900

d1

26d2 80 h6 90

e1 630 705 650 717 800

e2 660 800

e3 220,3 272

e4 230 278

e5** 353 443

h1 700 850

h2 400 495

h3 70 90

h4 140 195

l1 1315 1390 1387 1444 1527l2 435 462

l3 128 122

l4 85 120

driving shaft HR* HR*

nominal suction side DN 250 DN 300

sizes of discharge side DN 150 DN 200

connections superfeed DN 100 DN 125

liquid injection DN 15 DN 18

weight: max [kg] 1670 1740 2400 2560 2650

* male rotor** position discharge connection


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MAIN DIMENSIONSSCREW COMPRESSOR

SERIES LT TYPES XE, XF

07.2003/ 0 040_440gbr.doc - 1/1

Main oilinjection

Economizerport

l t3

d

t2

l t4

e t3

h

t3

e t4

e t5

b t1

h

t2

l t2e t1

h

t4

l t1

h

t1

e t2

Suctionside

MRFR

d t1

injectionLiquid

Dischargeside

type X XF

theoretical swept volume in m/h 7170 8560

b1 1078

d1

33

d2 110 h6

e1 806 905

e2 800

e3 320

e4 255

e5** 430

h1 980

h2 580

h3 95

h4 220

l1 1614 1713

l2 500

l3 124

l4 130

driving shaft Male rotor

nominal suction side DN400

sizes of discharge side DN250

connections superfeed DN150

Oil injection DN80

liquid injection DN25

weight: max [kg] 3500 3800

** position discharge connection


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CONDITIONS FOR REFRIGERANT CONNECTIONS

SCREW COMPRESSORS

07.2003/2 040 500gbr - 1/1

Connection Filter mesh size

[m]

Remarks

Suction

Discharge During pressure equalisation after stopping of thecompressor, care should be taken to prevent foreign matterwhich are bigger than the mesh size in the suction filter fromgetting into the compressor together with refrigerant vapourflowing back from the plant components arrangeddownstream of the compressor.

Economizer port The operating range is between control slide positions of100% and 85%. At part-load operation, care should be taken

to maintain the projected intermediate pressure.

Liquid injection port

Series SH, MC:

100 m

Series LT :

140 m

Refrigerant injection should only be used in conjunction withinertia-free temperature measurement on the compressor

discharge side (k


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CONDITIONS FOR LUBRICATING OIL CONNECTIONS

SCREW COMPRESSORS

07.2003/4 040 510gbr - 1/2

type function, purpose oil- Q p

oil

t viscosity

filter

pump l/min bar C mm/s m

min max min max max min max

C, D,

E, G

functional oil1) without see instructions p+0,55)

p-1,0p+3,55) 80 7 70 154)

functional oil2) without p+0,55)

p-2,5p+3,55) 80 7 70 15

, L,

M, N

oil injection without

see instructions

p2,5 p+3,55) 100 1 70 140

functional oil3) with p+0,5 p+5,0 80 7 70 15, R,

S, T


see instructions

p2,5 p+3,55) 100 1 70 60

capacity control with 2 6 Room 16) p+0,5...5,0

Room 26) p0+7 bar

Room 36) p0+ 4,5 bar

80 1 70 15

balancing piston,

heat pump

without 10 20 p1,5 p 100 1 70 15

V, Y functional oil3) with p+0,5 p+5,0 80 7 70 15


see instructions

p2,5 p+3,55) 100 1 70 140

capacity control with 3 7 Room 16) p+0,5...5,0

Room 26) p0+7 bar


80 1 70 15

balancing piston,

heat pump

without 15 25 p1,5 p 100 1 70 15

functional oil3) with p+0,5 p+5,0 80 7 70 15


see instructions

p2,5 p+3,55) 100 1 70 140

balancing piston,

heat pump

without 20 30 p1,5 p 100 1 70 15

W, Z,

XA XB

XC, XD

XE, XF

capacity control 7) with 2 6 Room 16) p+0,5...5,0

Room 26) p0+7 bar


80 1 70 15

poil oil pressure at the espective connection point of compressor

p pressure on the discharge side of compressor

1 functional oil

for bearing, shaft seal, balancing piston, oil injection, internal oil pump, capacity control and Vi-adjustment

2 functional oil

for bearing, shaft seal, balancing piston, internal oil pump, capacity control and Vi-adjustment

3 functional oil for bearing, shaft seal, balancing piston (+ capacity control, and Vi-adjustment for types Z, XA, XB, XC, XD)

4 oil filter in compressor

5 oil pressure with use of external oil pump

6 rooms 1,2 and 3 are defined in diagram

7 for external oil supply of capacity control (operation without integrated solenoid valve block)


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CONDITIONS FOR LUBRICATING OIL CONNECTIONS

SCREW COMPRESSORS

040 510gbr - 2/2 07.2003/4

Hints:

1. Use the selection programme Kabcom/GSCREW to choose the screw compressor. It gives additionalinformation about the oil circuit of the compressor and application limits of the compressors belonging to theseries SH and MC with integral oil pump. The selection programme specifies for which operating conditions anexternal oil pump for the functional oil circuit will be required (External oil pump required).

2. Depending on the operating conditions of the compressor, the oil flow rates required for safe compressoroperation are shown in the selection programme Kabcom/GSCREW. The oil pump must have a delivery ratereaching at least the value 1.5 x functional oil flow.

In the Kabcom/GSCREW selection programme, the terms

functional oil flow

total oil flow (with additional oil injection, if required)

are used.

3. Series LT

Hydraulic chambers for capacity control and Vi-adjustment:

1, 2 : Hydraulic chambers for capacity control; connections K, L

1, 2, 3 : Hydraulic chambers for combined Vi-partload adjustment; connections K, L, M

1 2

K L

3

M


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ELECTRIC CONNECTIONS

SCREW COMPRESSORS

07.2003/2 040 520gbr - 1/2

POSITION SENSOR / VALVE BLOCKS

component connected load output signal function screw compressortype

position sensor 24V (DC) 4-20 mAcontrol slide/ primary slideposition display

H, L, M, N, P,R, S, V, Y, Z, XA,XB, XC, XD, XE, XF

Vi slide position display H, L, M, N

position sensor 24V (DC) 20-4 mA control slide position display C, D, E, G

valve block 2valve block 4

24V DC24V AC48V AC

110V AC

230V AC

- Operates capacity control withvalve block 4 or combined Vi part load adjustment with valveblock 2 and 4

C, D, E, G, H, L, M, N,R, S, T, W, Z, XA, XB,XC, XD, XE, XF

Position sensor connection diagram

1

2

3

0V (ground)

+24V DC

4 - 20 mA

output signal:

For all SV typescontrol slide min. pos.: 4mA1)control slide max. pos.: 20mA

1) As distinct from the values indicated, values inexcess of 4 mA are also realized as minimum positionfor the control slide. (adjustment values for minimumposition are shown on the position sensor coil)

For all MC seriesVi slide position for small Vi: 4mAVi slide position for large Vi: 20mA

SOLENOID VALVES

Valve block 2 connection diagram Valve block 4 connection diagram

Y6 Y5

Y2

Y3Y4

Y1


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ELECTRIC CONNECTIONS

SCREW COMPRESSORS

040 520gbr - 2/2 07.2003/2

Valve bock 4: installed in all compressors

primary slide or control slidemoves in direction suction side : Y1 and Y4 open

Y2 and Y3 closed

primary slide or control slidemoves in derection discharge side: Y2 and Y3 open

Y1 and Y4 closed

Valve block 2: only in compresssors with variable Vi

SH and MC series

Vi reduction: Y6 open

Y5 closed

Vi increase: Y5 openY6 closed

LT Series

secondary slidemoves in direction suction side: Y5 open

Y6 closed

secondary slidemoves in direction discharge slide Y5 open

Y6 closed

Instructions:

The control of the magnetic valve blocks is outlined in data sheet 635014 Compressor Control.


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INSTALLATION CONDITIONS, SOUND, VIBRATION

SCREW COMPRESSORS

03.2002/1 040 600e - 1/1

INSTALLATION CONDITIONS:

compressor mounting surfaces - overall evenness of mounting feet: 0,5 mm- shim thickness: 25 mm

ambient temperature 18C*... 50 C

permissible vibration velocityfor compressor operation

Vmax: C G = 2,0 mm/sH N = 2,5 mm/sP S = 3,0 mm/sV - XA = 3,5 mm/sXB, XC, XD = 4,0 mm/s

* At low ambient temperatures the oil must be heated to 18C.

permissible piping forces compressor type

and moments: C, D, E, G H, L, M, N P R, S V, W, Y, Z, XA XB, XC, XD

suction port force F [N] 2500 3000 5000 5500 6000 7000

moment M [Nm] 1200 1800 2500 3000 3500 4000

discharge port force F [N] 2000 2500 4000 4500 5000 3500

moment M [Nm] 1000 1500 2000 2500 3000 3500

driving shaft radial force [N] 500 700 900 900 1300 1500

axial force [N] 200 300 400 400 600 800

sound power level: compressor type

C D E G H L M N Psound power level LWA dB (A) 82 83 84 85 86 87 88 88 88

sound power level: compressor type

R S V W Y Z XA XB XC XD

sound power level LWA dB (A) 89 90 91 91 92 93 94 96 96 96

vibration: compressor type

C, D, E, G, H, L, M, N, P, R, S, W, Z, XA, XB, XC, XD V, Y

main exciting

frequencies at3000 rpm(3600 rpm)

f1

f2f3f4f5

Hz

HzHzHzHz

50 (60)

100 (120)250 (300)500 (600)

6000 ...8000

structure-borne noise

50 (60)

100 (120)200 (240)400 (480)

5000 ...7000

Critical torsional natural frequency(with consideration to the total mass moment of inertia of rotor pair)

Type C N,P, R, S

V Z XB XC XD XE XF

Torsional frequency (Hz) above 200 174,6 115,4 97,6 90,8 84,0 77,1 70,9


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COUPLING REQUIREMENTS

SCREW COMPRESSORS

03.2002/1 040 610e - 1/1

The following requirements must be met when using a coupling not supplied by Grasso:

parameter compressor type

C /D E/G H/L M/N P R/S V/W/Y Z/XA XB, XC,XD

maximum drivingpower (60 Hz) kW

102 145 210 320 300 480 760 1080 1800

nominal torque Nm 280 390 570 865 810 1300 2050 2850 5730

maximum startingtorque Nm

700 980 1450 2150 2050 3250 5150 7200 14500

maximum speed min-1 3600

maximum dynamicunbalance allowable mNm 2 3 4 5

permissibleradial force FR

1)

permissibleaxial force FA

N

N

500

200

700

300

900

400

1300

600

1500

800

shaft diametercompressor mm 40-0,02-0,04 50h6 60h6 80h6 90

distance betweenshaft endscompressor/motor

mm 60+5 70+5 70+5 80+5 90+5

1) Maximum forces which are allowed to act on the compressor shaft end. The coupling must be selected andaligned in such a way that these forces are not exceeded.

Further requirements:

design of the compressor shaft end: cylindrical without key

attached to the compressor shaft end: by means of a firmly tightened clamping joint

direction of rotation: clockwise and anticlockwise

startup and shutdown frequency: maximum 20 per hour

operating temperature range: - 20 C to +55 C for dynamic operating load


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STARTING CONDITIONS

SCREW COMPRESSORS

03.2002/1 040 620e - 1/1

STARTING CONDITIONS WHEN COMMISSIONING

When commissioning the compressor, the followingconditions must be met:

A COMPESSOR SERIES SH AND MC:TYPES C, D, E, G, H, L, M, N

1. Min-position of the regulating slide Control of solenoid valves Y1 up to Y4 before

starting driving motor.

At startup the current signal from position sensor ofregulating slide must be: 4,0...10 mA.

If the named current signal is not reached after180 sec, the starting condition is expanded to acurrent signal of 15 mA (ca. 70%).

By starting driving motor the solenoid valves Y1 toY4 are closed and the solenoid valves Y2 and Y3 areopened (minimum direction).

2. Oil pressure For oil pressure see Data sheet 040510E.

3. Oil temperature The oil temperature upstream of the compressor

must be at least 18C.

4. Limiting time periods Within 15 sec after the driving motor has started the

oil pressure after the oil pump must be:poil=p +1,0 barp =discharge pressure

B COMPRESSOR SERIES LT:TYPES P, R, S, V, W, Y, Z, XA, XB, XC, XD

1. Min-position of the regulating slide Control of solenoid valves Y2 and Y3 (minimum

direction).

Starting the external oil pump.

At startup the current signal from position sensor of

regulating slide must be: 4,0...5,0 mA (0%...6%).

2. Oil pressure For oil pressure see Data sheet 040510E.

3. Oil temperature The oil temperature upstream of the compressor

must be at least 18C.

4. Time sequence and limitation Start the oil pump prior to commissioning the

driving motor. Start the driving motor, when both the required

Minimum position of the regulating slide and theoil pressure have been reached within the first15 sec after start-up of the oil pump.

If one or both requirements are not fulfilled withinthis time, the oil pump keeps running until bothrequirements have been met. However, the drivingmotor must not be started immediatelyafterwards.

After shutdown of the oil pump, an interval of600 sec is required prior to restarting the oil pump

and commissioning the driving motor. If the oil pump keeps running for more than

180 sec, a further start-up must not be performed.Find out the reason. The compressor control devicemust give a fault signal.

After start-up of the driving motor, a failure of theoil pressure poil is permissible for 10 sec within thefirst minute, and afterwards for 6 sec.


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OPERATIONAL MONITORING

SCREW COMPRESSORS

00.09 040 630e - 1/1

The following parameters must be recorded and monitored during operation of the compressor:

parameter to be recorded purpose

current of the compressor motor upper limit value(rated current limitation)

protection of motor and compressor

position of the control slide(primary slide)

minimum position ensures unloaded startup

entire adjustment length betweenMIN and MAX position of the slide

for capacity control andVi adjustment

position of the Vi-slide entire adjustment length betweenVimaxand Vimin

1)

Vi-adjustment

suction pressure lower limit value protection against lowsuction pressure

suction pressure within themeasuring range to be specified

controlled variable for capacitycontrol and Vi adjustment

discharge pressure upper limit value protection of compressor anddownstream plant components

discharge pressure within themeasuring range to be specified 1)

controlled variable for Vi-adjustment

discharge temperature 2) upper limit value protection of compressor anddownstream plant components

oil temperature upstream ofcompressor

oil feed temperature for bearingsand shaft seal within the measuringrange to be specified

protection of compressor

compressor oil inlet pressure(after oil pump)

differential pressure between oilpressure upstream of compressorand compressor discharge pressure

protection of compressor

1)Only for the corresponding compressor model.

2)Collected by transmitters with a low time constant k (k < 10 sec).


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LUBRICATING OILS FORSCREW COMPRESSORS

03.2002/2 040 721e - 1/3

Special refrigerator oils must be used for refrigerant compressors. The selection of the type of oil not onlydepends on its viscosity and its chemical properties, but also on the operating conditions of the respectiverefrigeration plant.

The oils given in the table can be used for screw compressors. The choice depends on the refrigerant, viscosity (atleast 7cSt for oil temperature before entering the compressor), vaporisation temperature (pour point) andrequirement made of the oil separation behaviour (flash point, viscosity or specially treated oils* hydrotreated).

The oils in Table 1 are recommended especially if minimum oil carry over is important.

Table 1:Lubricating oils for R717 (Ammonia)

Recommended oils

Manufacturer Oil type Basis Viscosity at40C in cSt

Flash point inC

Pour pointin C

Comment

CPI CP 1009-68 M* 68 226 - 40hydrotreated,only for R717

Petro Canada Reflo 68A M* 58 236 - 42hydrotreated,only for R717

Table 2:Lubricating oils for R22 and R717 (Ammonia)

Permissible oils

Manufacturer Oil type Basis(see footnote)

Viscosityat 40C in cSt

Flash pointin C

Pour pointin C

Comment

Castrol Icematic 299 M 56 180 - 34

Castrol Icematic 2294 PAO 69 233 - 60 for R717

CPI CP-4600-46 PAO 46 268 - 51 only

ELF Elfrima FR 46 M 46 171 - 37

ESSO Zerice 46 M 46 204 - 41

ESSO Zerice S46 AB 46 172 - 36

FUCHS-DEA Reniso S68 AB 68 190 - 33

MOBIL SHC 226E PAO 67 266 - 54 only for R717

MOBIL SHC 326 AB+PAO 61 211 - 54

MOBIL SHC 426 AB 65 176 - 36

MOBIL Gargoyle Arctic Oil300

M 64 202 - 40

MOBIL Gargoyle Arctic Oil CHeavy

M 44 187 - 50

Shell Shell Clavus G46 M 44 195 - 39 only for R22

Shell Shell Clavus G68 M 65 205 - 36 only for R22

Shell Shell Clavus 46 M 44 195 - 39 only for R717

Shell Shell Clavus 68 M 65 205 - 36 only for R717TEXACO Capella Premium M* 67 262 - 42 hydrotreated,

only for R717


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040 721e - 2/3 03.2002/2

Table 3:Lubricating oils for R134a; R404A; R407C; R410A; R507

Permissible oilsManufacturer Oil type Basis

(see footnote)Viscosity at40C in cSt

Flash point inC

Pour point inC

Comment

Castrol IcematicSW 68

E 68 250 - 39


E 100 255 - 30


E 220 290 - 26

CPI Solest 68 E 64 266 - 43

CPI Solest 120 E 125 262 - 27CPI Solest 220 E 216 271 - 27

FUCHS-DEA Reniso TritonSE 55

E 53 270 - 51

FUCHS-DEA Reniso TritonSEZ 80

E 80 275 - 39

FUCHS-DEA Reniso TritonSEZ 100

E 91 288 - 39

FUCHS-DEA Reniso TritonSE 170

E 170 260 - 24

Shell Shell ClavusR 68

E 64 250 - 54

Shell Shell ClavusR 100

E 93 280 - 45

MOBIL EAL 68 E 63 254 - 43

MOBIL EAL 100 E 96 250 - 37

Table 4:Lubricating oils for 290 (Propan)

Permissible oils

Manufacturer Oil type Basis(see footnote)

Viscosityat 40C in cSt

Flash point inC

Pour pointin C

Comment

Shell Madrela Oil T PAG 185 260 -30

CPI CP-1516-150 PAG 153 260 -34

Mobil Glygoyle 22 PAG 161 229 -41

Abbreviations used for the lubricating oils basis:

AB Alkylbenzene PAO Polyalphaolefin

E Polyolester PAG PolyalkylglycolM Mineral oilM* Mineral oil with special treatment (hydrotreated oil)


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03.2002/2 040 721e - 3/3

Table 5:Use of O-ring elastomers in screw-type compressors dependent on refrigerant and lubricant:

Oil

Refrigerant

M M* AB E PAO AB/PAO PAG

R717 (Ammonia) CR CR1) CR - HNBR CR HNBR

R22 CR - CR - - - -

R134a, R404A, R407C, R410A, R507- - - HNBR - - -

R 290 (Propan)- - - - - - HNBR

Abbreviations used for the elastomers:

CR Chloroprene (Neoprene caoutchouc)HNBR Hydrogenated nitrile butadiene caoutchouc

1) for shaft seal : HNBR

Note:

The pour point describes the cold fluidity of an oil and represents a non-guaranteed guide value for theminimum evaporating temperature.[ The pour point is defined as the temperature at which the fluidity of an oil decreases to an extent that itdoes not leave a jar within 5 sec under certain conditions.]

Compressors are equipped with suitable elastomers at the sealing point, which are selected dependent on the

refrigerant and lubricant. (Table 4) When selecting the type of oil, the compatibility of the sealant material used in the compressor for o-rings

(elastomer quality) must be taken into consideration in addition to the refrigerant. (see Table 4)

Not all the listed oil types can be used for an existing compressor. Allocation of the oil type dependent on theelastomer used is necessary, even for the same refrigerant.

Oil types are not always compatible with each other (not miscible).

Changing from one oil type to another can lead to disruptions in the operation of the compressor and toleakages at the sealing points. The compressor manufacturer should always be contacted before changing theoil type.

In exceptional cases, oils other than those listed in the table can be used, if the compressor manufacturer is

contacted first.

Attention:

The lubricant viscosity range downstream of the compressor given in data sheet 040 510emust always beobserved. At the same time, it must be noted that refrigerant/oil combinations are possible in which,dependent on the pressure and temperature in the oil reservoir (oil separator), the refrigerant dissolves in theoil. This leads to a reduction of the viscosity of the pure oil and to the formation of foam when the solutionequilibrium is altered due to pressure reduction or temperature increase.In this case, the oil must be cooled by a minimum temperature difference, which is calculated in thecompressor selection programme Comsel for the given operating conditions (11 to 14 K dependent on therefrigerant and operating condition). The compressor may only be operated if the oil entry temperature iscomplied with in accordance with the compressor selection programme.

The oil separation behaviour of the types of oil given in the Table can vary greatly (e.g. influence of oil vapourpressure, oil viscosity, solubility, final compression temperature).


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SCREW COMPRESSORSHINTS FOR SELECTION OF REFRIGERATION OIL

00.09/ 0 040 030e - 1/4

The properties of the refrigeration oil have an influence on the operation of refrigerating plants with oil-floodedscrew compressors, as it cannot be excluded that residues of the refrigeration oil get into the refrigerant circuitdespite of highly effective oil separators. For this reason, when selecting the oil consider besides

a sufficient lubricity of the oil at the bearing points of the screw compressor (minimum oil viscosity withconsideration of the solubility of refrigerants in oil depending on both the pressure and temperature),

the vapour pressure of the oil for a proper separation behaviour in the oil separator,

a sufficient fluidity of the oil at both the evaporating and suction temperature

the requirements upon the miscibility of the liquid phases of the refrigerant and the oil (miscibility gap).

The refrigerant used, the operation conditions and the specific plant design determine the required characteristicsof the refrigeration oil.

At present, five different base oil brands are used:

1. Mineral oils for ammonia and R22

2. Polyalphaolefins for ammonia

3. Alkyl benzene for ammonia and R22

4. Polyglycol (PAG-oil) for ammonia

5. Ester oil for R 404A, R 134a and R 507 as well as other new refrigerant blends such as R 410A or R 407C

Besides the pure base oil components there are also used blends of mineral oil and alkyl benzene or ofpolyalphaolefin and alkyl benzene.

The characteristics of the refrigerants with relation to the oils mentioned differ greatly.

Two basic requirements are placed upon the working media combination of refrigerant and refrigeration oil:

a.

Minimum oil viscosity of 7 cSt at the compressor inlet with consideration for the refrigerant solubility in oiland

b.

Miscibility of both liquid phases of a certain portion of the oil (ab. 1 to 2 %) and the refrigerant.

Besides the requirement of a sufficient viscosity of the lubricating oil, the discharge temperatures in thecompressor must be high enough to enable a subcooling of the refrigerant-laden oil by at least 10 K in order toprevent foaming in the compressor in case of decrease in pressure and/or increase in temperature, before the oilgets to the bearing points.The basic requirement b) is not met by mineral oil, alkyl benzene and polyalphaolefin in connection withammonia, as there exists a miscibility gap of 100 %, and neither a solubility of the refrigerant vapour in the oilnor a miscibility of liquid phases is given. Nevertheless these oils are preferably used in NH3-plants. Oil fineseparation stages prevent greater portions of the oil from getting into the refrigerant circuit.

The base oil versions mentioned will bring about differing oil carry-over rates as the flash points of the oils citeddiffer greatly from each other (lowest flash point of alkyl benzene at ab. 160 C, highest flash point ofpolyalphaolefin considerably above 200 C).

Although the fluidity of the oil is characterized by the pour point indicated by the oil manufacturers, the base oilbrands mentioned above feature different VT-characteristics so that at the same initial viscosity of say 68 cSt,

there may arise differences in viscosity at low temperatures in the evaporator in the range of ab. 1500 and20000 cSt at 20C.


48/134



040 030e - 2/4 00.09/ 0

With relation to oils, the refrigerants feature the following properties:

Ammonia

Exclusive of PAG-oil, ammonia is not soluble with other lubricants. However, mechanical intermixing is veryintensive so that the oil always carries along ammonia. Due to the low portion of the ammonia the lubricity of

the oil will not be changed. The miscibility between the liquid phases of oil and refrigerant is not given, too.For this reason, an efficient oil separation is required.

HFC (e.g. R134a, R404A, R507)possess no chlorine and are not limited in their application. Ester oils are used for these refrigerants. Thehigher solubility of these refrigerants in ester oil has to be considered when selecting an oil as the initialviscosity of the oil might drastically change by the refrigerant solved in the oil. However, the fluidity of the oilin the evaporator is given due to proper miscibility over a wide range.

The most important properties of the main oil groups are described in the following:

1.Mineral oil

Naphthenic base mineral oils are most suitable for refrigeration systems, but paraffinic base oils are also used.Due to special treatment (dewaxing) paraffinic base oils have more or less the same properties as naphthenicbase oils. Mineral oils are characterized by a relatively low miscibility with HCFCs (e. g. R22) at low

temperatures. Mineral oils feature a relatively high viscosity index and a low vapour pressure (higher flashpoint) whereby oil carry-over is positively affected.

2.Alkyl benzene(known also as alkyl benzole)

Alkyl benzenes represent synthetic oils produced from natural gas. They are characterized by high miscibilitywith HCFCs (e.g. R22) even at lower evaporating temperatures. Alkyl benzenes feature higher thermalstability than mineral oils (use of ammonia in piston compressors). Due to the lower flash point, however, theyhave a tendency to heavy foaming in the oil separator and to higher oil carry-over. After changing frommineral oil to alkyl benzene it should be considered that alkyl benzenes have a considerable cleaning effectcausing in its turn the filters to clog faster than usually in the time immediately after the oil change.

3.

PolyalphaolefinsPolyalphaolefins represent synthetic oils of high chemical and thermal stability. Therefore, they are preferablyused in compressors operating at high discharge temperatures e.g. in heat pumps.Polyalphaolefins are also employed in ammonia systems. The very low pour point permits very lowevaporating temperatures. The high flash point of the polyalphaolefins leads to smaller oil carry-over rate.Attention: The high aniline point of polyalphaolefins causes a relatively high shrinkage of O-rings wherebyleakages may occur even at static seals, when mineral oils or alkyl benzenes are replaced bypolyalphaolefins. For this reason, the use of pure PAO-oils in Grasso-compressors is not permitted at present.Shrinkage is prevented by adding of alkyl benzene. Therefore synthetic oil blends comprising polyalphaolefinand alkyl benzene may be employed.

4.Ester oils

In contrast to mineral oil, alkyl benzene and polyalphaolefin ester oils are soluble in the new non-chlorinatedHFCs (R 134a, R 404A, R 507 etc.). Therefore, the ester oils are the only lubricants at present which may be

used for the HFCs. Ester oils possess a higher flash point whereby the oil vapour portion from the oilseparator and hence the oil carry-over rate are favourably affected. Ester oils are hygroscopic. They absorbwater when getting in contact with the atmosphere. For this reason, ester oils have to be stored in closed

tanks. Prior to oil charging, the compressor has to be thoroughly evacuated.

5.Polyglycol oilPolyglycol oils are ammonia soluble and very hygroscopic. Thats why the same requirements have to beimposed as when handling ester oil. When selecting the oil take into consideration the reduction of viscositycaused by the refrigerant solved in the oil. Check the fluidity of the oil in the evaporator with consideration of

the miscibility between the lubricating oil and refrigerant at the corresponding evaporating temperatures.


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00.09/ 0 040 030e - 3/4

PARAMETERS USED FOR OILS:

Specific gravityThe difference in specific gravity between the refrigerant liquid and the oil may be of interest for oil return.

In this case it should be considered that alkyl benzene has a lower specific gravity than mineral oil and polyglykolhas a higher specific gravity than mineral oil. The method for specific gravity measurement is described in DIN51757.

ViscosityAccording to ISO standard 3448 lubricants are classified in viscosity grades indicated as ISO VG numbers. TheISO-no. is a nominal guide value only, i. e. the actual viscosity may vary in certain ranges (DIN 51562). Theviscosity indicated refers to 40 C and to 100 C.

Viscosity indexThe viscosity index gives the relationship between the change in viscosity depending on the temperature (ISO2909). A high viscosity index means smaller changes in viscosity at temperature changes as compared to a lowviscosity index.

Flash pointThe flash point indicates at which temperature the vapours escaping from a heated cup may be ignited over aflame. The method of measurement is described in ISO 2592. Oils with high flash point have a low oil vapourpressure. This will enhance the possibilities of oil separation from a compressed gas in the oil separator andreduce the oil carry-over rate from the compressor into the plant.

Pour pointThe pour point is the temperature at which the fluidity of an oil decreases to an extent that under certainconditions it will no more leave a jar within 5 sec. According to standard the pour point temperature is by 3 %lower than the measured temperature (method of measurement according to ISO 3016). The pour point isinteresting for working media combinations which are not soluble with each other. Oils having a low pour pointcan be returned to the suction side more easily than oils having a high pour point. The practice, however, shows

that oils may be used even at evaporating temperatures lower than the pour point without any operatingproblems.

Floc pointThe floc point indicates the temperature at which liquid R12 with the addition of 10 % oil will show flocculationby wax particles precipitating from the oil when chilled (method of measurement according to DIN 51351).The floc point is of interest when oil and refrigerant can be mixed. The floc point indicates that an oil containsbut a few wax particles and that plants employing HCFC (e. g. R22) can be operated at low evaporating

temperatures. When wax precipitation from the oil takes place, problems are to be expected at the expansionvalve or at the regulating valves. For ester oils a critical solution temperature is given measured with a mixture of10 % oil and 90 % of R134a. The critical solution temperature is the temperature at which the oil completelyprecipitates from the refrigerant (non-standardized value).

Aniline pointThe aniline point indicates the temperature at which the oil concerned shows a homogenous mixture with pureaniline. The aniline point is the measurement of the quantity of unsaturated carbon which can be found in theoil. It is an indication of the compatibility of different sealing materials coming into contact with the oil (method

of measurement according to ISO 3977). Most lubricating oils possess a low aniline point. Neoprene andchloroprene will swell. For this reason, O-rings have to be replaced after dismantling. Polyalphaolefin has a highaniline point causing neoprene to shrink. (use of HNBR required).

Neutralization numberThe neutralization number gives the acid content of an oil and is determined by titration with potassiumhydroxide solution (KOH). The value is given in mg of KOH per g of oil (method of measurement according toDIN 51558). Fresh oils should have a low neutralization number.

Hints for oil changePrior to changing the oil brand or the manufacturer of an oil, consult the compressor manufacturer to preventproblems in plant operation. In case of incompatible oil brands precipitations from the oil can occur which mightlead to problems within the plant (oil filter, lubrication of bearings, oil return not guaranteed). If, however, itshould be necessary to employ another type of oil, it is of vital importance to remove all the oil from the plantand to thoroughly clean both the compressor and oil separator (if possible, perform additional scavenging).

Oil selection tableAll oils permitted for the Grasso-screw compressors are given in the oil selection table. Depending on the specificconditions of a plant consider the above technical features when selecting an oil.


50/134



040 030e - 4/4 00.09/ 0

TABLEREFRIGERANT OIL COMPATIBILITY

Ammonia(NH3)

R22 R134a R404A R507

Mineral oil (M) x x - - -

Polyalphaolefins(PAO)

*

Alkyl benzene(AB)

x x - - -

Polyglycol(PAG)

* - - - -

Ester oil - - * * *

M + AB x x - - -

PAO + AB x - - - -

x = suitable, use of CR-O-rings* = suitable, use of HNBR O-rings

- = not suitable


51/134


P + I DIAGRAMSSCREW COMPRESSOR

SERIES SH AND MC

06.10.00/ 0 040 800e - 1/20

I. Screw compressors for single stagescrew packages

Oil pump P+I-No

A Mono-Packs: 1 screw in 1 package

for refrigeration/a.c./heat pump (cooled injection oil) intern SM11

for booster / for refrigeration and a.c. with low condending temperature(external oil pump for functional oil supply only)

extern SM12

heat pump (uncooled injection oil) intern SM13

for ammonia chiller with PAG oil(external oilpump for mechanical shaft seal only)

extern SM14

B Duo-Packs: 2 screws in 1 packagepart load range of each 15%/100%, with position indicator)

for refrigeration/a.c./heat pump (cooled injektion oil) intern SD11

for booster / for refrigeration and a.c. with low condending temperature(external oil pump for functional oil supply only; 2 oil stop valves eachcompressor)

extern SD12

for booster/ for refrigeration and a.c. with low condending temperature(external oil pump for whole oil supply; 1 oil stop valve each compressor)

extern SD13

for heat pump (uncooled injection oil) intern SD14

II Screw compressors for two stage packages Oil pump P+I-No

A as high pressure stage (external oil pump for functional oil supply only) extern SM21

B as Booster (with side load at intermediate pressure)(external oil pump for 4 - solenoid valve block only)

extern SM22

Remarks: Oil Pump - intern means: oil pump is a part of the screw compressor- extern means: oil pump is a part of the package

The P & I diagramms have to be used for all permitted refrigerants including ammonia and all permitted oils.For use of the combination of Ammonia and PAG-oil please contact Grasso R.T. in Berlin.

Screw compressors for DuoPacks are suitable for use in Multi-Packages with more than 2 screw compressors

The external oil pump has to supply functional oil with a pressure of pk+0,5 bar < poil< pk+2,5 bar.

The delivery flow of external oil pump has to be selected depending on compressor size (see compressorselection program) and depending on the number of compressors in a package. The compressor selectionprogram calculates the oil volume flow for 1 screw compressor.

The integrated oil pump delivers 3 l/min only and supplies it to the hydraulic system (solenoid valve block);the oil pressure of the integrated oil pump is limited by means of a integrated oil pressure control valve to 6bar over pressure of functional oil.

Screw compressors for heat pump application are equipped with one side acting thrust bearings. It is notallowed to use an external oil pump in screw compressors series SH and MC for heat pump application.


52/134


53/134



SERIES SH AND MC

06.10.00/ 0 040 800e - 3/20

P + I DIAGRAM SM12SERIES SH

MONOPACK, SINGLE STAGE, EXTERNAL OIL PUMP

oil supply

injected oil

functional oil

from oil filter

to oil filter

C

basic plate

oilmanagement block 1

closing stopper

K

external oil pump

external oil pressure control valve

solenoid valve block,internal supply

RX2

p

at discharge side of external oil pumpmeasuring oil pressure

measuring oil pressurebehind integrated oil filter

oil flow control valveinjected oil

p

X1

(0,5...2,5 bar)

Package

Screw

cooled oil

L

compressor


54/134



SERIES SH AND MC

040 800e - 4/20 06.10.00/0


MONOPACK, HEAT PUMP, INTERNAL OIL PUMP

oil supply

injected oil

functional oil

from oil filter

to oil filter

C

basic plate


K

solenoid valve block

RX2

at discharge side of oil pump

measuring oil pressure


p

X1

L

integrated oil pump, flanged housing

H

behind filter


p

uncooled oil

external oil filter functional

Z

Screw

Package

closing stopper

functional oil

oil cooler functional oil

p

integrated oil pressurecontrol valve

compressor


55/134



SERIES SH AND MC

06.10.00/ 0 040 800e - 5/20

P + I DIAGRAM SM14SH SERIES

MONOPACK, DX CHILLER, EXTERNAL OIL PUMP

N

oil supply

injected oil

functional oil

from oil filter

to oil filter

C

basic plate


K

external oil pump

solenoid valve block,external supply

RX2

p

at discharge side of oil pumpmeasuring oil pressure


behind integrated oil


p

X1

external oil pressure control valve(0,5...2,5 bar)

Package

Screw

cooled oil

L

functional oil

discharge housing

Closing stopper

shaft seal

and functional oil

compressor

closingstopper

Closing expander


56/134



SERIES SH AND MC

040 800e - 6/20 06.10.00/0

P + I DIAGRAM SD11SERIES SH

DUO PACK, SINGLE STAGE/HIGH STAGE, INTERNAL OIL PUMP

oil supply

injected oil

functional oil

from oil filter

to oil filter

C

basic plate oilmanagement block 2

N


RX2

measuring oil pressure behindfilter and solenoid stop valve


X1

L

integradet oil pump, flanged housing

solenoid stop valve

control valveintegradet oil pressure

cooled oil

Z

check valve

ScrewCompressor

p


57/134



SERIES SH AND MC

06.10.00/ 0 040 800e - 7/20


DUO PACK, EXTERNAL OIL PUMP, SINGLE STAGE, BOOSTER

oil supply

Injected oil

functional oil

C

basic plate oilmanagement block 2

closing stopper

K

external oil pump external oil pressure


RX2

p

behind filtermeasuring oil pressure


discharge side oil pump, functional oil


p

X1

(0,5...2,5 bar)

Package

Screwcompressor

cooled oil

external oil filter

control valve

solenoid stop valve

solenoid stop valve

L


58/134



SERIES SH AND MC

040 800e - 8/20 06.10.00/0


DUO PACK, EXTERNAL OIL PUMP, SINGLE STAGE

oil supply

injected oil

functional oil

C

basic plate oilmangement block 2

K


RX2

p

measuring oil pressuredischarge side of oil pump, functional oil


X1

Screw

external oil pumpbehind filtermeasuring oil pressure

p

Package

cooled oil

external oil filter

external oil pressure(0,5...2,5 bar)control valve

solenoid stop valve

for whole oil supply

compressor


59/134



SERIES SH AND MC

06.10.00/ 0 040 800e - 9/20


DUO PACK, INTERNAL OIL PUMP, HEAT PUMP

Regulierventilldruck-

injected oil

injected oil

functional oil

from oil filter

to oil filter

C

basic plate


K


RX2

at discharge side of oil pumpmeasuring oil pressure


p

X1

L

integradet oil pump,

H


p

uncooled oil

external oil filter functional oil

Z

Verdichter

Package

closing stopper

functional oil


p

integradet oil pressurecontrol valve

solenoid stop valve

flanged housing


60/134



SERIES SH AND MC

040 800e - 10/20 06.10.00/0


MONOPACK, TWO STAGE/HIGH PRESSURE STAGE, EXTERNAL OIL PUMP

oil supply

injected oil

functional oil

C

basic plate


closing stopper

K


RX2

p

measuring oil pressure at discharge sideof external oil pump and functional oil


X1

Screw

external oil pump external oil pressure contro lvalvebehind filtermeasuring oil pressure

p

(0,5...2,5 bar)

Package

cooled oil

external oil filter

L

compressor


61/134



SERIES SH AND MC

06.10.00/ 0 040 800e - 11/20


MONOPACK, TWO STAGE/BOOSTER, EXTERNAL OIL PUMP

oil supply

injected oil

functional oil

C

basic plate


K

solenoid valve blockexternal supply

RX2


X1

Screw

external oil pumpbehind filtermeasuring oil pressure

Package

cooled oil

external oil filter

L

p

closing stopper



62/134



SERIES SH AND MC

040 800e - 12/20 06.10.00/0

I. Screw compressors for single stage screw packages Oil pump P+I-No

A Mono-Packs: 1 screw in 1 package

for refrigeration/a.c./heat pump (cooled injection oil) intern MM11

for booster / for refrigeration and a.c. with low condensing temperature(external oil pump for functional oil supply only)

extern MM12

heat pump (uncooled injection oil) intern MM13

for ammonia chiller with PAG oil(external oil pump for mechanical shaft seal only)

extern MM14

B Duo-Packs (2 screws in 1 package/ part load range of each 15 or 30%/100%,

with position indicator)

for refrigeration/a.c./heat pump (cooled injektion oil) intern MD11

for booster / for refrigeration and a.c. with low condensing temperature(external oil pump for functional oil supply only;2 oil stop valves each compressor)

extern MD12

for heat pump (uncooled injection oil) intern MD13

II Screw compressors for two stage packages Oil pump P+I-No

A as high pressure stage (external oil pump for functional oil supply only) extern MM12

B as Booster (with side load at intermediate pressure)(external oil pump for 4 - solenoid valve block only)

extern MM21

Remarks: Oil Pump - intern means: oil pump is a part of the screw compressor- extern means: oil pump is a part of the package

The P & I diagramms have to be used for all permitted refrigerants including ammonia and all permitted oils.For use of the combination of Ammonia and PAG-oil please contact Grasso R.T. in Berlin.

Screw compressors for DuoPacks are suitable for use in Multi-Packages with more than 2 screw compressors

The external oil pump has to supply functional oil with a pressure of pk+0,5 bar < poil< pk+2,5 bar.

The delivery flow of external oil pump has to be selected depending on compressor size (see compressorselection program) and depending on the number of compressors in a package. The compressor selectionprogram calculates the oil volume flow for 1 screw compressor.

The integrated oil pump delivers 9 l/min only and supplies it to the hydraulic system (solenoid valve block);the oil pressure of the integrated oil pump is limited by means of a integrated oil pressure control valve to 6bar over pressure of functional oil.

Screw compressors for heat pump application are equipped with one side acting thrust bearings. It is notallowed to use an external oil pump in screw compressors series SH and MC for heat pump application.


63/134



SERIES SH AND MC

06.10.00/ 0 040 800e - 13/20

P + I DIAGRAM MM11SERIES MC

MONOPACK, SINGLE STAGE, INTERNAL OIL PUMP

injected oil

functional oil

D

solenoid valve blockat discharge side of oil pumpmeasuring oil pressure

oil flow control check valve

p

SE


control valve

integrated oil pressure

cooled oil

C1

oil supplyfunctional oil

Screwcompressor

oil supplyinjectedl oil

C2


64/134



SERIES SH AND MC

040 800e - 14/20 06.10.00/0


MONOPACK, SINGLE STAGE, EXTERNAL OIL PUMP

external oil pump


cooled oil

injected oil

functional oil

D



p

S

E

C1


Screwcompressor

oil supply

injectedl oil

Package

internal supply

Package

C2

oil filter


65/134



SERIES SH AND MC

06.10.00/ 0 040 800e - 15/20


MONOPACK, HEAT PUMP; INTERNAL OIL PUMP


uncooled oil

external oil filter functional oil

Package


p

injected oil

functional oil

D



p

SE


control valveintegrated oil pressure

uncooled oil

C1


Screwcompressor


cooled oil

C2

external oil filter injected oil


66/134



SERIES SH AND MC

040 800e - 16/20 06.10.00/0


DX CHILLER, EXTERNAL OIL PUMP

functional oil

external oil pump external oil pressure control valve(0,5...2,5 bar)

cooled oil

injected oil

Functional oil shaft seal

D

solenoid valve blockdischarge side oil pumpmeasuring oil pressure

Oil flow controlcheck valve

p

S

E

C1

functional oil, oil pump pressure

Screwcompressor

oil supplyinjected oil

internal supply

Package

C2

Functional oil dischargehousing

closing expander, only types H and L

external oil filter

injected oil check valve


67/134



SERIES SH AND MC

06.10.00/ 0 040 800e - 17/20

P + I DIAGRAM MD11SERIES MC

DUO PACK, SINGLE STAGE/HIGH PRESSURE STAGE, INTERNAL OIL PUMP

injected oil

functional oil

D



p

S

E



cooled oil

C1


Screwcompressor


C2

Package

solenoid stop valve


68/134



SERIES SH AND MC

040 800e - 18/20 06.10.00/0


DUO PACK, SINGLE STAGE, EXTERNAL OIL PUMP

injected oil

functional oil

D



p

S

E

C1


Screwcompressor


internal supply

external oil pump


cooled oil

Package

C2

solenoid stop valve

oil filter

solenoid stop valve


69/134



SERIES SH AND MC

06.10.00/ 0 040 800e - 19/20


DUO PACK, HEAT PUMP, INTERNAL OIL PUMP


uncooled oil

external oil ilter unctional oil

Package


p

injected oil

functional oil

D



p

SE



uncooled oil

C1


Screwcompressor


cooled oil

C2

external oil filter injected oil

solenoid stop valve


70/134



SERIES SH AND MC

040 800e - 20/20 06.10.00/0


MONOPACK, TWO STAGE/BOOSTER, EXTERNAL OIL PUMP

external oil pump

external oil pressure controlvalve(0,5...2,5 bar)

cooled oil

injected oil D

solenoid valve block(discharge side oil pump)measuring oil pressure

p

S

E

C1

Screw

external supply

Package

C2

functional oil

closing stopper


functional oil(discharge pressure)

compressor


71/134


72/134


OVERALL CONCEPT

AISH02-1_gbr.doc - 2/3 03.2002

BRIEF DESCRIPTION

Screw compressors of oil-flooded construction withcontinuously variable capacity control and anadjustable Vi-volume ratio. The compressors arecompactly designed and have the following integratedsubassemblies:

Check valve suction side

Suction filter

Oil filter system

Flanged oil pump

Overflow valve between discharge and suction side

Check valve discharge side

Solenoid valve blocks to control the capacity controland Vi-adjustment

Flange connection between compressor and drivemotor

The following subassemblies are optional:

heck valve suction side

Check valve discharge side

Suction filter

Oil filter

Oil pump

Overflow valve

The corresponding design can be seen from the List ofParts supplied with the compressor concerned.

6 74

41 2 3

58

Figure 1 Screw comp ressor SH Series

1 Centering flange

2 Check valve suction side

3 Suction filter

4 Solenoid valves for capacity control and Vi-Adjustment

5 Oil filter

6 Check valve discharge side

7 Overflow valve

8 Oil pump


73/134


OVERALL CONCEPT

03.2002 AISH02-1_gbr.doc - 3/3

DESIGN FEATURES

Theoretical suction volume:C: 231 m/hD: 265 m/hE: 321 m/hG: 372 m/h

Lateral arrangement of the connecting flangesuction side

Optional lateral or lower arrangement of theconnecting flange discharge side

Asymmetrical rotor profile with a lobe ratio malerotor/ female rotor of 5 : 6

Capacity control and Vi-adjustment with 2 inde-

pendently operating slides which are hydraulicallyadjustable (parallel slide system PS)

Hermetically sealed electronic modules fordisplaying the position of the control slide

Shaft sealing by means of balanced and oil-sealedmechanical seal

Cylindrical roller bearings and ball bearings toabsorb radial and axial forces

Partial compensation of the axial forces by meansof a balancing piston

Mechanism to prevent gas pulsations in the lowerpart-load range at high operating pressure levels

Operation of the compressor with flanged orexternal oil pump

Operation of the capacity control with flanged oilpump

An oil connection to the internal oil system for:

Shaft sealing

Bearing lubrication

Oil pump

Partial compensation of the axial forces

Oil injection into the working area

Solenoid valve on oil connection (special design)

ADDITIONAL CONNECTIONS:

For a second volume flow (e.g. for coupling aneconomizer)

For injecting liquid refrigerant (additional cooling)

For oil return from the refrigerating plant

For preventing gas pulsations

For adjusting the capacity

Documents

GRASSO Screw Comp_Product Information