WEMCO Screw-Flow

• 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

• Sludges
• Raw & unscreened sewage
• Paper stock & wood chips
• Wet well cleanup
• Crystalline compounds
• Bacterial Floc
• Easily damaged fruits & vegetables
• Coal
• Configurations
• Horizontal
• Vertical
• Submersible
• Prerotation

3 to 10 inch

6 to 270 feet (2 to 82 metres)

32F to 180F (0C to 82C)

150 to 10000 GPM (34 to 2275 m³/hr)

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

The single vane impeller of the WEMCO® Screw Centrifugal 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.

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 Centrifugal 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.

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.