• Design
  • Mechanical
  • Fluid
  • Manufacturing
  • Category Tags
Design
Brand
Imo
Product Type
Pumps > Three-screw
Related Industries
General Industry,
Marine
Mechanical
Pressure Discharge
Maximum: 2200bar-d
Driver
Magnetic
Fluid
Fluid Temperature Range
Maximum: 225°F
Flow
Maximum: 400ft³/h
Viscosity
4mm²/s to 5400mm²/s
Manufacturing
Construction Features
Bearing
Categegory Tags
Design Types
base plate
Installation
horizontal, vertical, dry

Product Description

Three-Screw pump Single Suction up to 150 bar

Ductile iron cased three screw pump for high pressure (2500 psi or 178 bar) applications.

Series 12D Imo pumps are intended for relatively high pressure service on petroleum or similar viscosity liquids. Typical applications include crude oil pipeline service, fuel atomization for burning in a steam boiler, fuel injection for combustion gas turbines, fluid power service on hydraulically operated machinery, gas sealing in centrifugal compressors and hydrostatic bearing support.

These pumps are hydraulically balanced in both the axial and radial directions which eliminates bearing loads due to discharge pressure. The single bearing is external to the liquid pumped and does not rely on the lubricating qualities of the pumped liquid. The single mechanical seal is exposed only to inlet pressure. Very low airborne noise levels are normal for Imo three screw positive displacement pumps as are high operating efficiencies and non-pulsating delivery of flow.

12D

SERIES

Nominal flow rate, GPM/LPM, at 2200 PSI (152 BAR), 200 SSU (43 CST)

SPEED RPM

Size

3500

2900

1750

1450

1150

960

106

12/45

9/35

4/15

-

-

-

118

17/66

14/51

6/23

-

-

-

137

28/107

22/84

11/40

8/29

-

-

156

43/165

35/131

18/67

13/50

9/34

-

187

77/293

62/235

33/125

25/96

18/67

13/49

218L

101/383

81/308

44/166

34/128

24/91

18/67

218

126/479

102/387

56/211

44/165

32/119

24/90

250

191/725

155/588

86/326

68/257

50/189

38/145

275E

217/822

176/667

98/370

77/292

57/215

44/166

275

-

209/792

117/442

93/351

69/260

53/202

312P

-

248/939

140/529

112/422

83/315

65/247

312

-

313/1186

178/673

142/539

107/406

85/321

350

-

-

255/966

206/778

156/590

125/472

400P

-

-

309/1169

250/945

190/721

153/578

Series 12D Specifications

Casing- High shock capacity ductile (nodular) iron. Cast steel optional, sizes 118-218.

Rotor Housing- Pearlitic gray iron for rotor sizes 106 through 187; bronze sizes 218 and larger. Special bimetallic housings available in some sizes for low viscosity, high pressure services.

Power Rotor-Alloy steel, nitride hardened and thread ground.

Idler Rotors- Pearlitic gray iron, induction hardened and thread ground for sizes 106 through 187; alloy steel, nitride hardened and thread ground.

Gaskets- Cellulose and non-asbestos fiber.

Seal & Bearing- Type B: Buna N bellows mechanical seal, Buna N o-rings and standard external, permanently grease packed, deep groove ball bearing- recommended for distillate fuels and lubricating oil or hydraulic fluids. Type H: Positive drive mechanical seal, fluoroelastomer o-rings and external high temperature, permanently grease packed, deep groove ball bearing.

Accessories- Completely mounted, built to order pump/driver assemblies are available with baseplates, ANSI RF spool pieces, NEMA 'C' face adapters.

Outlet Pressure- 2200 PSIG (152 BAR) maximum for lube, seal and hydraulic oils. 1500 PSIG (103 BAR) maximum for distillate, residual and crude oils. Minimum recommended differential pressure is 40 PSI (2.8 BAR).

Inlet Pressure- Type B & H: 75 PSIG (5 BAR) maximum, distillate fuel, lube- sizes 106-187. 50 PSIG (3 BAR) maximum, distillate fuel, lube- sizes 218-400. Type H: 40 PSIG (2.7 BAR) maximum, residuals and crude oil- sizes 106-187. 10 PSIG (0.7 BAR) maximum, residuals and crude oil- sizes 218-400

Viscosity- 33 SSU (2.0 CST) minimum. Type B: 3000 SSU (650 CST) maximum (consider cold start). Type H: Viscosities above 3000 SSU (650 CST)

Temperature- Type B: 0 to180°F (-18 to 82°C). Type H, sizes 106-187: 0 to 250°F (-18 to 121°C) for <1800 RPM, 0 to 225°F (-18 to 107°C) for > 1800 RPM. Sizes 218 and up: 0 to 200°F (-18 to 93°C).

Drive- Direct only. Magnetic Drive configurations also available.

Rotation- Clockwise facing pump shaft . Consult Imo for counterclockwise.

Mounting- May be foot mounted in any orientation. Flange mounting optional for certain applications.

Filtration- Inlet strainers are required to keep contaminants and abrasives out of the pump. They must be selected in consultation with the strainer vendor to prevent pump starvation. Normally, 60 mesh (0.01 inch- 238 micron) for light and 1/8-3/16 inch (3-5mm) openings for heavy oils are recommended.

Maximum Speed- Do not exceed 1800 RPM pumping residual fuels or crude oil due to the presence of abrasives and contaminants:

Maximum RPM*

Size:106118137156187218250275312350400
RPM44004400440044004400360036003000250025002500

* Assumes minimum inlet pressure requirements are met.

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