Submersible Pumps Designed For Large Flows and Unscreened Sewage, Including Wipes

Submersible Pumps Designed For Large Flows and Unscreened Sewage, Including Wipes
Submersible line (SL) pumps from Grundfos Pumps

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The submersible line (SL) of wastewater pumps from Grundfos Pumps are designed to handle raw, unscreened sewage, effluent, large volumes of surface water and process water in municipal, utility and industrial applications.

The pumps, made for submerged installation, are available with a SLV/SuperVortex impeller or SL1/S-tube impeller that can accommodate up to 4-inch solids and large flows of raw sewage.

“The biggest difference is the SL1 is a tube-style impeller that is completely enclosed, whereas the SuperVortex or SLV is a recessed impeller,” says Russell Smith, wastewater large product manager for Grundfos.

“Whether you choose a tube-style impeller or a vortex-style impeller has to do with the hydraulic design condition of your lift station and the type of installation,” he says. “Both are very capable of handling solids. Both produce certain types of flows and heads. It just depends on what the station is looking for. The enclosed impeller can produce higher efficiencies and flows. A vortex impeller typically delivers lower flows at higher head conditions but is not as efficient as an enclosed impeller.”

The entire range of SL pumps can handle flows up to 5,000 gpm and spherical solids up to 6.25 inches, including wipes.

“Flushable wipes inside wastewater lift stations is a growing concern within the wastewater pump community,” Smith says. “Wipes alone are not difficult to deal with, but when they combine with grease, oils and other types of material it causes the wipes to grow in size. That’s why it’s important when you install a wastewater pump that you install one that not only can handle the wipes but can handle larger-size debris, such as grease and wipes when combined together.”

The SL pump features IE3 premium motor components, quick removable pump housing clamps, cartridge seals, quick removable plug-in cord, and smooth exterior components for optimal performance and easy service. The modular design enables cartridge shaft seals, cable plugs, wear rings and other components to be shared across the product line, reducing the amount of inventory required and overall cost of ownership.

The pumps are available in standard, FM-approved explosion-proof models and FM-approved explosion-proof sensor models. Sensor options within the pump enable the operator to monitor stator temperature, seal chamber oil status, moisture penetration, bearing temperatures and vibration either locally or remotely from a computer. Certain models can also be configured in a dry pit submersible with a closed-loop cooling jacket, and mounted either horizontally or vertically. 800/921-7867; us.grundfos.com.



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