Weir Specialty Pumps

WEMCO® Screw-Flow Pump

Weir Specialty Pumps is dedicated to providing the most advanced technology, always striving to increase product performance, reducing cost and improving lead time.

1. Low NPSH: The screw portion of the WEMCO® Screw-Flow impeller performs as an inducer, pulling liquid into the impeller, resulting in low NPSH requirements.

2. Solids Handling: The single vane impeller of the WEMCO® Screw-Flow pump creates a single channel flow, allowing for larger solids passage. The large solids passage provides better solids handling capabilities than any other pump type. The steep head-capacity curve provides ample reserve pressure to clear temporary clogs.

3. Sludge Handling | Positive Suction: The combination of a low NPSH requirement and large solids channels provides a powerful pump for handling thick sludges. The steep head-capacity curve of the WEMCO® Screw-Flow pump also allows for pumping of varying sludge consistencies without the need to change speed. An additional benefit is the reserved head for clearing temporary line blockages.

4. Adjustable Liner Consistent impeller to liner clearance is imperative to the performance of the pump. As the pump components wear, clearance between the impeller and liner can be adjusted to ensure optimal performance.

The WEMCO® Screw-Flow pump is equipped with a classic single vane screw-centrifugal impeller. The long-established screw-centrifugal design provides clog-resistant pumping for trouble free movement of solids, and fibrous and stringy materials. The steep head-capacity curve produced by the impeller provides additional head to help push through any partial blockages.

Features:• High efficiency• Low NPSH requirements• Steep head/capacity curve• Flushless tandem mechanical seals• Adjustable liners• Large solids passage• Solids Passage: 2.5 - 4.75 in• High Chrome Iron impeller & liner

ASTM A532 Class III Type A

Type: S Features• Packing• SS 420 Shaft Sleeve• Flush Required

9 Flushless Tandem Mechanical Seals

Optional Impeller Flush Port

Oil Bath

10

11

12 Packing (Mechanical Seals Optional)

Flush Port

Scupper drain

13

14

WEMCO® Screw-Flow Pump | Bearing Frames

Type: S/SM Bearing Frame

Type: W Features• Tandem Mechanical Seal• Oil Bath• Flushless• AES Seals

1

2

3

45

6

9

10

11

8

12

14

13

Type: W Bearing Frame

Type: SM Features• Customer Specified

Mechanical Seal• Multiple Seal Options

Bearing Frame Features• 50,000 hour bearing life• 1045 Steel Shaft• Belt Drive• Direct Connect• Greased Bearings

Configurations• Horizontal• Vertical• Submersible• Prerotation

7

1 HCI Screw-Flow Impeller

Adjustable, HCI, Grooved Liner

Regulator Nuts

Pump-out Grooves

Thrust Bearings

Radial Bearings

Labyrinth Bearing Seal

Case Vent & Drain

2

3

4

5

6

7

8

Applications:• Sludges• Raw & unscreened sewage• Paper stock & wood chips• Wet well cleanup• Crystalline compounds• Bacterial Floc• Easily damaged fruits & vegetables• Coal

Submersible motor

• 50,000 hour bearing life

• Locally serviceable motors

• Class 1, Division 1, Group C & D Hazardous Area

• Inverter duty

• 3 N/C thermostats

• Moisture probes

• Epoxy cable entry

• Class F insulation

Submersible Configurations

• Prerotation

• Wet pit

• Submersible legs

• Fastout discharge elbow

WEMCO® Screw-Flow Submersible Pump

The WEMCO® Prerotation Basin was designed to direct flow to the tangential entrance channel. The direction of flow through the channel creates a rotation of the fluid inside the prerotation basin, before it enters the pump. The rotation of the fluid inside the basin folds floatable solids off the surface and into the pump flow stream, allowing removal from the wet well, resulting in a wet well that automatically cleans itself every time the prerotation pump runs through its operating cycle.

Benefits

• Floatables are folded into the suction of the pump

• Settled solids are carried to the pump

• Less maintenance than traditional wet well installations

• No manual, labor intensive, and time consuming wet-well wash-down

• Easy retrofit to existing stations

Installation Benefits

• Maximum flexibility in site specific, individual applications

• Operates with or without a VFD

WEMCO® Prerotation Basin

Weir has joined forces with Baldor® to equip the WEMCO® Screw-Flow Submersible pump with a tried and true submersible motor. With thousands of engineering and design hours, the WEMCO® Screw-Flow Submersible pump provides the same clog-resistant pumping for trouble free movement of solids, and fibrous and stringy materials, for submersible applications.

Applications:• Clarifier scum• Collection systems• Railroad and truck wash• Storm water equalization• Slaughterhouse waste

Weir Specialty Pumps

440 West 800 South Salt Lake City, UT 84101 USA

T 801 359 8731 www.weirsp.com

Copyright © 2016, 2015 Envirotech PumpSystems, Inc.. All rights reserved. WEIR and WEIR (logo) are trademarks and/or registered trademarks of Weir Engineering Services Ltd. WEMCO is a trademark of FLSmidth A/S used under license by companies forming part of The Weir Group PLC. BALDOR is not a trademark belonging to any company forming part of The Weir Group PLC.

WEMCO Screw-Flow Pump Brochure Version 3, July 2016