Accumulators___Accessories.pdf

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Local Solutions for

Individual Customers

Worldwide

S

T A

U

F FAccumulators & Accessories



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Accumulators & Accessories Page

Introduction 3

Material Options & Features 4, 5

Bladder Accumulators - STBA

Dimensions 6

Ordering Codes 7

Diaphragm Accumulators - STDA

Dimensions 8

Ordering Codes 9

Safety Blocks - STASB

General Information and Ordering Code 10

Bladders - STBDimensions 11

Ordering Codes 7

Anti-Extrusion Rings (AER) 11

Accessories

Accumulator Adaptors 10

Clamps and Brackets 12Charging Kit - STA-CK-1 13

Services and Sizing

Precharging Procedure 14

Maintenance 15

Installation 16

Disassembly and Reassembly Instructions 17,18

Accumulators Sizing Chart for Storage Applications 19

Contents



3

Introduction

Accumulators provide a means of regulating the performance of a hydraulic system. They are suitable for storingenergy under pressure, absorbing hydraulic shock, dampening pump pulsation and flow fluctuations. Bladder or diaphragm accumulators provide excellent gas and fluid separation ensuring dependable performance, maximumefficiency, and long service life.

Why use an Accumulator?

• Improves your system efficiency • Accepted world wide

• Supplements your pump flow • High/ low temperature tolerance

• Supplies extra power in an emergency • Extremely safe (cannot be disassembled under pressure)

• Compensates for any system leakage • Quick response

• Absorbs hydraulic shocks • Wide range of compounds for a variety of fluids

Accumulator Function

The design of the Stauff accumulator makes use of the difference in the compressibility between a gas (nitrogen) anda liquid (hydraulic fluids). The bladder contained in the shell is pre-charged with nitrogen gas to a pressure determinedby the system pressure.

After pre-charging, the work can be split into three steps.

Step 1. When the hydraulic fluid enters the accumulator, the nitrogen contained in the bladder is compressed andits pressure is increased.

Step 2. The compression of the bladder stops when the pressure of the fluid and nitrogen are equal (balanced).During this step the bladder is not subject to any abnormal mechanical stress.

Step 3. On demand, as system pressure falls, the accumulator’s stored fluid is returned to the system under pressure applied by the compressed nitrogen. On completion of the hydraulic system functions, theaccumulator reverts to step 1.

Accumulators and Accessories



4

Material Options and Features

MainComponents

StandardMaterial

MaterialOptions

Features

Shell

• Alloyed Steel

• All Sizes Comply with AS1210 MaterialsSpecifications

• Bare Metal

• Epoxy paint external

Consult Stauff

• Seamless shell construction

• Documentation to AS4343provided

• Available with Foreignor Domestic Certificates(Consult Stauff)

Bladder • Low temperature Buna-N

(NBR)

Viton - (V)

EPR - (E)Hi-Temp Buna (HBR)

Consult Stauff for other options

• 1 piece fully enclosed

moulded bladder • With moulded steel valve

stems

• Wide range of operatingtemperatures

Oil Port Assembly

• AISI 4130 material spec. Consult Stauff

• Proven design and reliability

• Port options available, refer to ordering code

Bladder Accumulator Maximum Flow Rates

• Test Pressure (bar): 1.25 x Design Pressure

• Min/Max Working Temperature acceptable (°C): -20 / ±80

• Min/Max Storage temperature (°C): -40 / ±80

• Meets AS1210 and AS4343 specifications

• Meets 4 –1 design factor at normal operating pressures.

• Available with foreign certificates (upon request)

• Generally available from stock.

Size (litres)Max. Recommended Flow

LPM

1 & 2.5 336

4 564

10 - 57 1176




5

1 ShellBladder accumulator shells are made from chrome-molybdenum alloy steel (SA372) with forged endsfor maximum strength. All sizes comply with AS1210material specifications, and documentation to AS4343are provided.

2 Bladder

Stauff bladders are manufactured from the most

advanced elastomers which are capable of meetinga wide range of systems requirements. Bladders areoffered in a variety of compounds to meet a, wide rangeof fluids and operating temperatures. Standard materialis low temperature Buna –N (NBR).

3 Bladder Stem

All bladder accumulators, sizes 4 litre and larger, arefitted as standard with two-piece bladder stems withreplaceable gas valve cartridge for ease of serviceability.

4 Port AssembliesStandard oil service ports are made from high-strengthalloy steel for maximum durability.

5 Fluid Port

BSPP(standard), NPT and Split Flange Adapters areavailable (See page 10). Bleeder ports (plugged) areincluded as standard on sizes 4 litre and larger.

6 Gas Valve All accumulators are fitted with a gas valve for ease of gas pre-charging. 4 litre and larger units are equippedwith a cored gas valve cartridge (ISO-4570-8V1) for ease of maintenance. For safety, the gas valve will ventif unscrewed.

Material Options and Features

1

2

3

4

6

5




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Stauff Bladder Accumulator Dimensions and Specifications(Conforming to AS 1210)

NominalCapacity(Litres)

Max.W.P.(bar)

DimensionsNet

Weight

A B C ød øD øF G øH SW on flatsKg

mm mm mm mm mm BSPF Bleed Plug mm mm

1.1 400 321 54 80 22.5 117 G3/4” N/A 101 32 5.7

2.5 400 522 54 80 22.5 118 G3/4” N/A 101 32 10

4 345 446 65 80 22.5 168 G1 1/4” Hex 19 a/f 101 70 14

10 210 585 103 80 22.5 222 G2” Hex 19 a/f 101 70 27

20 210 891 103 80 22.5 222 G2” Hex 19 a/f 101 70 42

25 210 1041 103 80 22.5 222 G2” Hex 19 a/f 101 70 55

37 210 1428 103 80 22.5 222 G2” Hex 19 a/f 101 70 66

50 210 1933 103 80 51 222 G2” Hex 19 a/f 101 70 92

57 345 2003 103 80 22.5 229 G2” Hex 19 a/f 101 70 125

ø D

BSWG

ø F

A

ø d

C

ø H

For Support Brackets and Clamps refer to page 12.

Advantages

• Medium Pressure: 4-57 Lt• High Pressure: 1.1-2.5 Lt• Small diameter • Improved corrosion protection for fluid port and protection cap

• Stronger gas valve• Standard 1176 L/Min High flow fluid port




7

Stauff Bladder Accumulators Ordering Codes

Model Code

STBA - Stauff Bladder Accumulator

Type

O - Oil Service Bladder (Standard)

W - Water Service Bladder (Optional)

Other approvals on request

STB - Bladder only

SizeCode

CapacityLitres

011 1.1025 2.5

040 4

10 10

20 20

25 25

37 37

50 50

57 available in T style only 57

Bladder Material

NBR - Low Temp. Buna-N (Standard) 4 - 57L (-15 to 80˚C)

HBR - High Temp Buna-N (Optional) (0 - 130˚C)

V - Viton (Optional) (-20 to 140˚C)

E - EPR (Optional) (-40 to 120˚C)

Pressure Rating

P3 - 3000 PSI / 210 Bar (Standard) 10 - 50L

P5 - 5000 PSI / 345 Bar (Standard) 4 & 57L

P6 - 6000 PSI / 400 Bar (Standard) 1.1 & 2.5L

Fluid Port Connection

B - BSPF Threaded (Std) 1.1 - 57L

F - Code 62 Split Flange (Optional) 4 - 57L Available with Split Flange Adaptor **

** Not available on water service

Style

B - Bottom Repairable (Standard)

T - Top Repairable (Optional)

Design Code

1 - Standard (Australian Standard) AS 1210

* - Special design No. to be assigned

STBA O 011 HBR P3 B B 1

STB O 011 HBR




8

Part No.VolumeLitres

PressureBar

ChargingThread

Connection(øF)

Dimensions (mm) WeightKgA B SW øD G

STDA032NBRP3BN1 0.32 210 G1⁄4” G1⁄2” 140 20 32 95 29 1.7

STDA050NBRP3BN1 0.5 210 G1⁄4” G1⁄2” 152 22 41 106 34 2.0

STDA075NBRP3BN1 0.75 210 G1⁄4” G1⁄2” 169 22 41 124 34 2.9

STDA100NBRP1BN1 1 200 G1⁄4” G1⁄2” 180 22 41 136 34 3.5

STDA032NBRP3BN1M 0.32 210 M 28 x 1.5 1⁄2” BSP 140 20 32 95 29 1.7

STDA050NBRP3BN1M 0.5 210 M 28 x 1.5 1⁄2” BSP 152 22 41 106 34 2.0STDA075NBRP3BN1M 0.75 210 M 28 x 1.5 1⁄2” BSP 169 22 41 124 34 2.9

STDA100NBRP1BN1M 1 200 M 28 x 1.5 1⁄2” BSP 180 22 41 136 34 3.5

Stauff Diaphragm Accumulators Dimensions and Specifications

1/4” BSP gas valve connection for easy use

with Stauff charging kit #STA-CK-1

For diaphragm accumulator sizing consult your local Stauff office.

Advantages• Non-repairable diaphragm

accumulator • Compression ratio of 8:1• Electron beam welded steel shell• Standard nitrile rubber high strength diaphragm

• European certification - CE• Charging thread G¼” or M28 x 1.5

1 0 m m


4 0 m m

G1/4”

ØD

M 28 x 1,5

2 2

A

B

1 4 m i n

0 , 5

SW (hex)

ØG

ØF



9

STDA 032 NBR P3 B N 1 M

Stauff Diaphragm Accumulators Ordering Code

Model Code

STDA - Stauff Diaphragm Accumulator

SizeCode

CapacityLitres

032 0.32

050 0.5

075 0.75100 1

Pressure Rating

P1 - 2900 PSI/200 Bar (Standard) 1L

P3 - 3000 PSI/210 Bar(Standard) 0.32,0.5,0.75L

Fluid Port Connection

B - G1/2 BSPF (Standard)

Style

N - Non Repairable (Standard)

Design Code

1 - Standard (Certified European - CE)

* - Special design No. to be assigned

Diaphragm Material

NBR - Low temp Buna - N (Standard) -15 to 80˚C

Charging Thread

- G¼

M - M 28 x 1.5




10

• Provides manual isolation (ball valve) of the accumulator from the circuit

• Stauff Test 20 coupling supplied for sampling or pressure monitoring

• Safety blocks are also available with an electric dump valve option (AC/DC).Price on application

Safety Blocks

Stauff CodeNominal

SizeIsolation

Accumulator Connection

Recommended SeriesWeight

kg

STASB-10-M-1-5-350A-S12 NG10 manual BSPM 3/4” 4 litre - 350 bar 5.6

STASB-20-M-1-5-350A-S13 NG20 manual BSPM 1 1/4” (10 to 57 litre) - 350 bar 12.1

STASB-32-M-1-5-350A-S309 NG32 manual BSPM 2” (10 to 57 litre) - 350 bar 12.1

Accumulator Adaptors

Description Stauff Code

2” BSPP Plug with O-Ring STAP-0-32

Reducing Bush 2” BSPPM x 1/2” BSPPF STRB-32-08

Reducing Bush 2” BSPPM x 3/4” BSPPF STRB-32-12

Reducing Bush 2” BSPPM x 1” BSPPF STRB-32-16

2” Bonded Washer ATB036

1/2” Bonded Washer ATB025

3/4” Bonded Washer ATB027

1” Bonded Washer ATB030

SAE Flange Inserts with Captive Seals1/2”SAE Code 61 x 1/2” BSPPM STFI-3-0808M

1/2” SAE Code 62 x 1/2” BSPPM STFI-6-0808M


3/4” SAE Code 62 x 3/4 “ BSPPM STFI-6-1212M


SAE Flanges

Code 61, 1/2” Split Flange Pair SFC308

Code 61 , 3/4” Split Flange Pair SFC312

Code 61 , 11/4 “ Split Flange Pair SFC320

Code 61, 2” Split Flange Pair SFC332

Code 62, 1/2” Split Flange Pair SFC608

Code 62, 3/4” Split Flange Pair SFC 612

Code 62, 11/4” Split Flange Pair SFC 620

TP • Other options available on request

10, 20 & 32 - Nominal Size

M - Manual Relief

1 - High Tensile Steel Body

5 - Seal (NBR)

350 - Relief Valve Setting (factory set at 350 bar)

A - Connection for P & T Ports - BSPP Standard

S -

STASB

12 Adaptors - G1/2" (NG10)

13 Adaptors - G1" (NG20)

309 Adaptors - G1 1/2" (NG32)




11

Stauff offer a wide range of bladder materials to suit most applications. Please consult Stauff for details of bladder compatibility, with fluid and fluid temperature.

Table 1 gives the range of bladder materials available with their corresponding working temperature when handlingnon-aggressive fluids.

Table 2 can be used to distinguish bladder capacities by overall dimensions. For other bladder materials consultStauff.

Stauff Code Bladder MaterialTemperature Range

from ̊C to ̊C

NBR Low Temperature Buna-N(Standard) -15 80

HBR High Temperature Buna-N 0 130

V Fluorocarbon(Viton) -20 140

E Ethylene Propylene (EPR) -40 120

Accumulator Capacity (l)

Nominal

DimensionH mm

DimensionD mm

0.16 154 41

0.6 132 73

1.1 147 91

2.5 335 100

4.0 203 142

10.0 283 198

20.0 610 198

37.0 1128 198

50.0 1603 198

57.0 1703 198

Table 1

Table 2

Bladder Kit

Bladder Dimension Tables

H

D

Anti Extrusion Ring Assembly

Stauff Part No. Accumulator Size Connection to Accumulator BSPM

STB-AER-01 1.1, 2.5L G3/4”

STB-AER-02 4L G1 1/4”

STB-AER-03 10 - 57L G2”

• Anti extrusion ring (AER) assembly includes the moulded anti extru-sion ring with split ring, fluid port (or top plug) O-ring and back-up ring& bleed plug bonded seal for 4 to 57 litre.

• Oil service AER supplied in nitrile carbon steel split ring (standard).For water service, AER incorporates a stainless steel split ring.

Interchangeability

Stauff bladders are fullyinterchangeable withcommon Europeanbrands.

Always quote full Part No. e.g.STB-O-011-NBR, capacity, NitrileRubber, 1/4” BSP.

The kit comprises of :

- Bladder - Back up ring

- Gas valve - Protective Cap*

- Lock nut - Bleed plug seal*

- Fluid port ‘O’-Ring

*4L capacity and above only

Anti-extrusion ring assembly suppliedseparately, refer below.

Fluid port assemblies are available on request.

Description Stauff Code

Bladder Assembly to suit 1.1L Accum. STB-0-011-NBR

Bladder Assembly to suit 2.5L Accum. STB-0-025-NBR

Bladder Assembly to suit 4L Accum. STB-0-040-NBR






Bladder Kit - Ordering Codes




12

Clamps and Brackets

Support Brackets

• Saddle clamps manufactured from mild steel with zincplated finish

• Rubber strips are made from nitrile

• Support brackets manufactured from mild steel with zincplated finish

• Cushion rings made from nitrile

Saddle Clamps Stauff Part Number

1 to 2.5 litre AMP114

4 litre AMP170

10 to 57 litre AMP228

Support Brackets Stauff Part Number

4 litre BB120R

10 to 57 litre BB170R

4 Litre

10 - 57 Litre

Saddle Clamps

4 Holes ø17

2 Holes ø17




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- Stauff recommend the use of nitrogen gas only for pre-charging of accumulators.

- Always wear protective safety glasses.

- Pressure gauge is a safety pattern type to AS1349-1986

The kit has adaptors to connect the hose to the nitrogen cylinder as well as adaptors to connect the control valve to theaccumulator.

- Optional: 0-17000 kPa outlet nitrogen regulator. Code SAR017000

Charging Kit #STA-CK-1

SAA 10143SAA 50019

SAA 2069TSAAGAS531

SAA 50510

SAA 2069

Note: Pictures not to scale.

Order Code Description

1 STA -CK -1 Accumulator Charge Kit

Comprising of:

2 SAA50019 0.302 x 32 TPI adaptor

3 SAA10143 7.8” UNF adaptor

4 SAA50510 ¼” ISO 228 adaptor

5 SAAGAS531 Type 50 - ¼” BSPT bottle adaptor

6 SAA2069 Valve

7 SAA2069T Valve tool

8 SAAPC2156/250Charging/pre - loading/gauge set,0-250 BAR

9 SMS20/B ¼-2000BGAS Hose assembly - 2m

To maintain optimum performance in hydraulic systems employing accumulators, it is recommended that the gaspre-charge pressure be checked regularly. A loss in the gas pre-charge pressure will cause a drop in the systemefficiency and may cause damage to the accumulator bladder, diaphragm or piston.

The charging kit allows hydro-pneumatic accumulators, whether bladder type, diaphragm type or piston type, to be

charged with nitrogen to the desired pressure. For this purpose, the kit is connected to a commercially availablenitrogen cylinder by a flexible hose.

The kit can also be used by technicians to check the current gas pre-charge pressure. The control valve incorporatesa pressure gauge to permit direct pressure readings as well as a check valve to prevent back flow in the case of low pressures in the nitrogen cylinder. A manual bleed valve allows excess pressure to be reduced to the desiredoperating pre-charge level.

Please contact your local Stauff office for other adaptors.

1

2

5

3

6

4

7

9 8




14

• Prior to commissioning a hydraulic system, any accumulators in the system should have their pre-chargepressure checked and adjusted.

• The condition of the accumulator is primarily determined by periodic checking of the pre-charge pressure.

• Hydraulic Accumulators are pressure vessels and only qualified personnel should perform maintenance.• Drain all fluid completely from accumulator before performing any maintenance.

• DO NOT weld or braze directly on accumulator shell.

• DO NOT use automotive type valve cores as high pressure accumulator gas valves.

• The most accurate pre-charge readings can only be taken when fluid pressure is at zero.

• Always observe the maximum working pressure and operating temperature ranges.

Precharging Procedure

General Information

Pre-charging Bladder Accumulators

A Isolate the accumulator from the system, open the drain valve and make sure hydraulic fluid pressure is zero.

B Remove gas valve protection cap and valve cap from the accumulator.

C To charge the accumulator, use a charging hose and gauge assembly from the Stauff Charging Kit # STA-CK-1rated for 250 bar maximum.

D Before using the charging assembly (Figure 1.) make sure that valve A is completely open (counter-clockwise),and that bleed valve B (Figure 1.) is closed.

E Connect the charging unit to the gas fill valve on the accumulator by means of knurled cap D (Figure 1.).

F Fit the gas bottle adaptor (included in Stauff charging kit) to the nitrogen bottle, make sure that the gas valve onthe nitrogen bottle is closed (see Figure 2.) then attach gas hose to the gas bottle adaptor on the nitrogen bottle.

G Connect the other end of gas hose to the Stauff test coupling C (Figure 1.), after taking off its cap.

H Turn valve A (Figure 1.) clockwise to the point where resistance is felt or pressure is registered on thegauge(only if there is an existing pre-charge).

I SLOWLY open valve on nitrogen bottle (Figure 2.) and allow the gas to flow to the accumulator.J When the pressure in the accumulator is slightly higher than is required, close the valve on the nitrogen bottle.

K Open valve A (Figure 1.) (counter-clockwise) and reduce the pressure in the gas hose and charging assembly tozero by means of bleed valve B (Figure 1.).

L Remove hose from non-return Stauff test coupling C (Figure 1.) and replace cap.

M Close the bleed valve B (Figure 1.) and wait a few minutes for pressure to stabilise.

N Screw valve A (Figure 1.) clockwise until pressure can be read on gauge. This should be slightly higher than therequired pressure.

O Adjust pressure by means of bleed valve B (Figure 1.), then unscrew valve A (Figure 1.), counterclockwise.Open valve B (figure 1) then remove charging unit.

P Replace gas valve cap and protective cap on accumulator. Accumulator is now ready for use.

NOTE: Allow accumulator to rest about 10-15 minutes after gas pre-charging. This will allow gas temperature to adjustand equalise. Recheck gas pre-charge pressure and adjust if necessary. Check accumulator gas valve for any leakswith soapy water. Always wear safety glasses.

Figure 1 Figure 2

A

B

C

D

- Safety pattern gauge.




15

Maintenance

General Information

The condition of the accumulator is primarily determined by periodic checking of gas pre-charge pressure. Onlyqualified personnel should perform any maintenance on accumulators. Nitrogen gas pre-charge pressure shouldbe checked at least once during the first week of operation to ensure that no leak has developed. The pre-chargepressure and ambient temperature should be recorded at installation and checking done at the same temperature if

possible. If there is no loss of gas pre-charge pressure, it should be rechecked in approximately 4 months. Thereafter,it should be checked annually. Check pre-charge if the system is acting sluggishly. If pre-charge is low, check gasvalve for leakage and recharge.

Bladder Accumulators

1 Use appropriate valving in the hydraulic system to discharge all hydraulic fluid from accumulator.

2 To check or adjust pre-charge pressure, HYDRAULIC PRESSURE MUST BE REDUCED TO ZERO.Pre-charge pressure should be checked periodically.

3 Charging and checking should be done with an accumulator charge kit similar to Stauff Part # STA-CK-1.

4 Remove gas valve protection cap and valve cap as per pre-charge procedure instructions (B) on page 14

5 Attach gauge assembly to accumulator gas valve.

6 Make sure bleed valve B (Figure 1.) is closed, depress gas valve core gently by turning valve A (Figure 1.)clockwise. Gas pressure can now be read on gauge.

7 To reduce pressure, open bleed valve B (Figure 1.) carefully, allowing gas to escape until desired pressure isobtained. It the pre-charging pressure is less than required, refer to the pre-charging procedure on page 14

NOTE: Allow accumulator to rest about 10-15 minutes after gas pre-charging. This will allow gas temperatureto adjust and equalise. Recheck gas pressure and adjust if necessary. Check accumulator gas valve for any

leaks with soapy water.

Figure 1

The kit has adaptors to connect the hose to the nitrogen cylinder as well as adaptors to connect

the charging/pre-loading/gauge set to the accumulator.

A

B

C

D

- Safety pattern gauge. According to AS 1349-1986.

- Stauff recommend the use of nitrogen gas only for pre-charging of accumulators.

- Always wear protective safety glasses.




16

Installation

Item Spare Parts

1 Bladder Kit

2* Bladder assembly

3* Gas valve assembly

4 Gas valve cap

5 Fluid port assembly

6 Anti extrusion ring

7* Drain plug with seal (1)

8* Seal kit

(1) For accumulators 10 to 57 Litre

* These parts are supplied as a kit with instructions.

How to order the Bladder Kit

When placing your order, please indicatethe accumulator part number.

Example:

Bladder kit to suit: STBA O 011 HBR P3 B B 1

Prior to any installation, it is necessary to visually check theaccumulator in order to detect any possible damage incurredduring transport. For optimal operation, the accumulator needs to be located as close as possible to the “application”.It may be installed vertically (gas valve facing up), or

horizontallly.

• Avoid standing in the alignment of the connections.

• Consider the environmental conditions and if needed,protect the accumulator against heat sources, electrical andmagnetic fields, lightning strikes, humidity and foul weather

• Keep 200mm over the top of the gas valve free of encumbrance to allow the use of a charging head

• Allow free access to the oil drain

• Keep all markings visible

• Install in such a way so as to prevent any undue stress on

the pipework, either directly or indirectly• Clamp the accumulator tightly to a fixed support or alternatively guard it to limit its displacement in case of aconnection failure to the hydraulic system

• Connect the accumulator to the hydraulic system using theright connectors or flanges

• Check the compatibility of the fluid with the materials used

• Ensure that the maximum design pressure of theaccumulator exceeds the maximum system pressure

• Ensure that pressure and temperature limits are notexceeded

• Equip the hydraulic system with a pressure relief device

• If necessary, add-on a burst disk to account for risks of over pressure associated with thermodynamic effects

• Install an appropriate Stauff filtration unit and/or organiseregular internal inspections as often as is necessary whendealing with abrasive fluids

It is strictly forbidden to:

• Weld, screw or rivet anything onto the accumulator body

• Operate in any way that may alter the mechanical propertiesof the accumulator

• Use the accumulator for construction purposes. (No stressor loading)

• Modify the accumulator without prior approval from themanufacturer

• Use any other gas than nitrogen for precharging

Commissioning

Refer to commissioning instructions supplied with theaccumulator.

For end user requirements regarding regulationinspection and registration, please consult your local Stauff office for details.


Accumulators are consideredas pressure vessels.



17

Disassembly Instructions

Bladder Type

NOTE: It is good practice to disassemble accumulators in a clean areato keep all parts free of foreign matter.

Remove protective cap

Remove gas valve cap

Release nitrogen from theaccumulator using Stauff charge kit #STA-CK-1

Remove complete gas valveor gas valve core only

Remove locknut and metal label

Remove bleed plug(2 different models shown)

Undo lock ring and removeflange washer

Squeeze the anti extrusionring(AER) through the opening

Push fluid port inside of shelland remove o-ring and back upring

Remove the fluid port and bladder

1

2

3

4

5

6

7

8

9

10




18

Neatly fold the bladder (logitudinally) and squeeze itinside the shell through the fluid

end. Locate the gas valve andpush it through the opening atthe gas end

Remove the gas valve.Squeeze the bladder todischarge air from it. Lubricatethe inside of the shell by turningit around on its axis. Use theprocess fluid or similar liquid

Pace the fluid port inside theshell (poppet first). Fold andplace it inside the shell so thatmetal components are locatedon the shell opening

Pull the fluid port through the AER. Assemble o-ring, backupring, flange washer and lockingring (in that order)

Ensure that the fluid port iscentred

Tighten the locking ring

Tighten the bleed plug

Mount the metal plate. Tightenthe locking nut (on the gas side)and fit the gas valve or gasvalve core

Reassembly Instructions

Bladder Type

NOTE: It is good practice to assemble accumulators in a clean area tokeep all parts free of foreign matter.1

2

3

4

5

6

7

8

The steps outlined in theprocedures above show thesuggested sequence of eventsto carry out maintenance onaccumulators utilising widelyaccepted general engineeringfitting practices and are notmeant to be of a technicalnature.These procedures may varyaccording to accumulator types

NOTE:




19

Above volumes in litres discharged between P3/P2

Sizing Chart for Storage Applications

Pressure

RatioP3/P1≤5

BLADDER ACCUMULATORS

STANDARD BLADDER ACCUMULATORSTRANSFER BARRIER WITH 50L GAS

BACK-UP BOTTLE (BUB) FITTED

P3/P2 OB OF 11 O3 O4 10 20 28 37 50/54 5728+ 1BUB

37+ 1BUB

37+ 2BUB

54+ 1BUB

54+ 1BUB

P3/P2

1.05 0.005 0.018 0.035 0.08 0.12 0.29 0.57 0.78 1.07 1.49 1.6 2.2 2.46 3.87 2.87 4.28 1.05

1.10 0.01 0.035 0.066 0.14 0.22 0.34 1.09 1.49 2.03 2.84 3.03 4.18 4.69 7.37 5.49 8.16 1.1

1.15 0.015 0.049 0.094 0.21 0.31 0.78 1.55 2.12 2.9 4.04 4.31 5.96 6.73 10.56 7.88 11.73 1.15

1.20 0.019 0.063 0.12 0.26 0.39 0.98 1.97 2.69 3.68 5.13 5.48 7.58 8.6 10.06 14.97 1.2

1.25 0.022 0.074 0.143 0.31 0.47 1.17 2.35 3.2 4.39 6.12 6.53 9.06 10.2 11.94 17.76 1.25

1.30 0.026 0.086 0.149 0.36 0.54 1.35 2.69 3.68 5.03 7.02 7.49 11.91 13.94 1.3

1.35 0.029 0.096 0.183 0.4 0.6 1.5 3.01 4.11 5.62 7.84 8.37 13.11 15.35 1.351.40 0.032 0.104 0.201 0.44 0.66 1.65 3.29 4.51 6.16 8.6 9.17 16.77 1.4

1.45 0.034 0.113 0.217 0.47 0.71 1.78 3.56 4.87 6.65 9.28 9.9 18.09

1.50 0.036 0.121 0.231 0.5 0.76 1.9 3.8 5.2 7.11 9.98 10.58 19.33

1.55 0.038 0.128 0.245 0.53 0.81 2.01 4.03 5.51 7.53 10.5 11.2 Above volumes in litres discharged between P3/P2

HOW TO USE CHART ABOVE

1. Use above chart in same way as left butlimiting volume discharged to that shown, so

that V1-V3 does not exceed 0.80 of actual

accumulator shell volume.

The corresponding pressure ratio is seenunder P3/P2 column.

HOW TO USE THE CHART LEFT

Problem: What Size of Accumulator will

discharge 1.4L of liquid between 140bar and

120bar.

1. P3/P2 = 1.17

2. Find the value of P3/P2 which is equalto or next lowest to 1.17. In this case the

value is 1.15.

3. Select accumulator reference equal to or

next greater to 1.4L from the values locatedin the row 1.15 i.e. 1.55 Project upwards

and read off accumulator reference i.e. 20.

NOTES

P3 = Maximum system pressure

P2 = Minimum permitted system pressure

P1 = 90% of P2Volumes delivered based on

P1V1 = P3V3 = Isothermal Compression

P3V3n = P2V2n = Adiabatic Expansionwhere n = 1.4

1.60 0.041 0.135 0.258 0.56 0.85 2.12 4.23 5.79 7.89 11.04 11.78

1.65 0.042 0.141 0.27 0.59 0.89 2.21 4.43 6.05 8.27 11.54 12.31

1.70 0.044 0.146 0.28 0.61 0.92 2.3 4.6 6.3 8.6 12.01 12.81

1.75 0.046 0.152 0.29 0.63 0.95 2.38 4.77 6.52 8.91 12.44 13.27

1.80 0.047 0.157 0.3 0.65 0.98 2.46 4.92 6.73 9.2 12.84 13.7

1.85 0.048 0.161 0.31 0.67 1 2.53 5.06 6.93 9.47 13.21 14.09

1.90 0.049 0.165 0.32 0.69 1.04 2.6 5.2 7.11 9.71 13.56 14.46

1.95 0.051 0.169 0.325 0.71 1.06 2.66 5.32 7.28 9.95 13.88 14.81

2.00 0.052 0.173 0.331 0.72 1.09 2.72 5.44 7.44 10.17 14.19 15.14

2.10 0.054 0.179 0.344 0.75 1.13 2.83 5.65 7.73 10.56 14.74 15.72

2.20 0.056 0.186 0.355 0.77 1.17 2.92 5.84 7.98 10.91 15.23 16.24

2.30 0.057 0.191 0.365 0.8 1.2 3 6 8.21 11.22 15.66 16.7

2.40 0.059 0.195 0.374 0.82 1.23 3.07 6.18 8.41 11.49 16.04 17.11

2.50 0.06 0.2 0.382 0.83 1.26 3.14 6.28 8.58 11.74 16.38 17.47

2.60 0.061 0.203 0.389 0.85 1.28 3.2 6.39 8.74 11.95 16.68 17.79

2.70 0.062 0.207 0.395 0.86 1.3 3.25 6.5 8.88 12.15 16.95 18.07

2.80 0.063 0.21 0.401 0.87 1.32 3.29 6.59 9.01 12.32 17.19 18.33

2.90 0.064 0.212 0.406 0.88 1.34 3.34 6.67 9.12 12.42 17.41 18.56

3.00 0.065 0.215 0.411 0.89 1.35 3.37 6.75 9.22 12.61 17.6 18.77

3.20 0.066 0.219 0.419 0.91 1.38 3.44 6.88 9.4 12.85 17.94 19.12

3.40 0.067 0.222 0.425 0.92 1.4 3.49 6.98 9.54 13.04 18.2 19.41

3.60 0.068 0.224 0.43 0.94 1.41 3.53 7.06 9.65 13.2 18.42 19.64

3.80 0.069 0.227 0.434 0.95 1.43 3.57 7.13 9.75 13.33 18.6 19.83

4.00 0.07 0.228 0.437 0.96 1.44 3.59 7.18 9.82 13.43 18.74 19.98

4.50 0.075 0.231 0.443 0.97 1.46 3.64 7.28 9.45 13.61 18.98 20.24

140

120

The chart below is designed as a quick guide only for sizing of accumulators. It does not take into account actualisothermal or adiabatic conditions. For accurate system design requirements consult your Stauff Office.




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