MULTISTAGECENTRIFUGALBLOWERSZM 31

Curves are based on atmospheric conditions of 1 Atm, 68F/20C, 36% RH, and 3550 rpm

General Performance Speci�cations Standard

Technical DataNumber of Stages ............... 1 to 11

Inlet Connection .................. 3” �ange, ASA 125# / ANSI 150# drilling

Optional DIN 80 adapter �ange

Outlet Connection ................ 3” �ange, ASA 125# / ANSI 150# drilling

Optional DIN 80 adapter �ange

Operating Speed .................. Fixed speed 3550 RPM (60 Hz), 2960 RPM (50 Hz)

Variable speed option available

Casing Pressure..................... 15 PSIG (1 bar)

Seals (air) ............................ Labyrinth type

Seals (gas) .......................... OPTi Seal/ Stu�ng box type/ Carbon ring type/

Custom available

Bearings .............................. Ball, 10-year minimum life per AFBMA L10 standard

Lubrication .......................... Standard Grease

Impeller Diameter ................ 14.50 in (368.3 mm)

Impeller Tip Speed .............. 225 ft/s (68.5 m/s) direct, 321 ft/s (97.9 m/s) belt

First Critical Speed .............. 6320 RPM (11-stage)

Drive Type ........................... Direct coupled or Belt driven,

Inlet driven (standard) or Outlet driven

Shaft End ............................ 1.125 in (28.58 mm) diameter at coupling

Vibration Tolerance ............. .25 in/s (6.4 mm/s) ISO overall speci�cation,

1.25 mils (0.03 mm) peak to peak

Rotor Balance ...................... Military standard 167-1. Individual impellers and rotating assembly dynamically balanced

Materials of ConstructionCasing ................................. Cast iron ASTM A48 grade 25/30

Bearing Caps & Housings ... Cast iron ASTM A48 grade 25/30

Shaft ................................... Carbon steel AISI 4140 (stainless steel available)

Impellers ............................. Cast aluminum ANSI AA319/356 (stainless steel/custom alloys available)

Seals (air) ............................ Cast iron ASTM A48 grade 30 with lead babbitt insert Zinc-Alloy, ZA-12

Seals (gas) .......................... Consult Factory

Tie Rods .............................. .50 in (12.7 mm) diameter, high strength steel ASTM A193-B7/B7M available

Blower Base ........................ Welded structural steel ASTM A36 ASME/AWS D1.1

Motor Pedestal .................... Welded steel plate ASTM A36

Joint Sealing Compound .... RTV silicone

Base Isolation Pads ............. Neoprene rubber

Finish .................................. Standard 2 part epoxy, 7011 Atlas Copco Dark Gray

1

mbar PSIG

0

2

40

120

160

200

INLET FLOW RATE

0

2

4

5

7

8

9

SHA

FT IN

PUT

POW

ER

DIS

CHA

RGE

PRES

SURE

BHP kW

4

3

1

6

2

5

ZM 31 Blower

0

1

2

3

4

0

2

mbar inHg

27

213

240

INLET FLOW RATE

SHA

FT IN

PUT

POW

ER

INLE

T VA

CUU

M

BHP kW

1

4

6

ZM 31 Exhauster

5

187

160

133

6

3

2

3

0

100

50 100 300

m3/hr

CFM

150 250 350 400 450 500

150 200 250

1

7

3

1

10

3

4

30020050

0

100

50 100 300

m3/hr

CFM

150 250 350 400 450 500

150 200 250

30020050

4

8

7

6

5

5

7

6

53

107

80

280

240

80

www.atlascopco.uswww.e�ciencyblowers.com

ZM 31 MULTISTAGE CENTRIFUGAL BLOWER

Inlet and Outlet Orientation OptionsThe orientation of the inlet and outlet is selectable from any of three di�erent positions, as viewed when facing the exterior of the part:

General Arrangement

Weight and Inertia

*Standard con�guration.

Dimensions* Model A B F† L†

3101 4.13 (105) 4.94 (125) 35 (889) 39 (991) 3102 6.31 (160) 7.13 (181) 35 (889) 39 (991) 3103 8.50 (216) 9.31 (237) 41 (1041) 45 (1143) 3104 10.69 (271) 11.50 (292) 41 (1041) 45 (1143) 3105 12.88 (327) 13.69 (348) 46 (1168) 50 (1270) 3106 15.06 (383) 15.88 (403) 46 (1168) 50 (1270) 3107 17.25 (438) 18.06 (459) 53 (1346) 57 (1448) 3108 19.44 (494) 20.25 (514) 53 (1346) 57 (1448) 3109 21.63 (549) 22.44 (570) 56 (1422) 60 (1524) 3110 23.81 (605) 24.63 (625) 56 (1422) 60 (1524) 3111 26.00 (660) 26.81 (681) 61 (1549) 65 (1651)

*Dimensions in inches and (millimeters) and are approximate. Do not use for construction purposes.

†Dimension may vary depending on motor frame size.

Weight* Wk2†

Model lb kg lb-ft2 kg-m2

3101 140 64 1 0.04 3102 180 82 2 0.08 3103 220 100 3 0.12 3104 260 118 4 0.16 3105 300 136 5 0.20 3106 340 154 6 0.23 3107 380 172 7 0.27 3108 420 191 7 0.31 3109 460 209 8 0.35 3110 500 227 9 0.39 3111 540 245 10 0.43*Approximate weight for blower only.† Inertia based on cast impellers.

E-TS-ZM031-001, REV 00 11/28/2012

8

POSITION 1*

POSITION2

POSITION 1*

POSITION3

OUTLETPOSITIONS

INLETPOSITIONS

POSITION2

POSITION3

3" OUTLET3" INLET

F

L

3.00(76.2)

9.50(241.3)

A2.00

(50.8)

6.31 (160.3)

4.38 (111.1)

B9.06(230.2)

ISOLATION PADS

Ø7.50 (190.5)Ø6.00 (152.4) B.C.

Ø7.50 (190.5)

18.25(463.6)

Ø3.00 (76.2)

5/8-11 UNC TAP(4) HOLES

Ø6.00 (152.4) B.C.

1.00(25.4)

Ø .88 (22.2)(4) HOLES

Ø3.00 (76.2)

5/8-11 UNC TAP(4) HOLES

22.63(574.7)

11.75(298.5)

17.00(431.8)

20.25(514.4)

10.13(257.2)9.19

(233.4)

19.25(488.9)

21.69(550.9)

12.50(317.5)

7.00(177.8)