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