Grundfos Submersible wastewater pump SL1.50.65 .11.2.50B

Non-self-priming, single-stage, centrifugal pump designed for handling wastewater, process water and unscreened
raw sewage.
The pump is designed for intermittent and continous operations in submerged installation. The revolutionary S-tube®
impeller provides free spherical passage of solids up to 50 mm and is suitable for wastewater with a dry matter
content of up to 3 %. A unique stainless-steel clamp assembling system enables quick and easy disassembly of the
pump from the motor unit for service and inspection. No special tools are required.
Further product details
The pump is suitable for both temporary and permanent installation either as free-standing on ring stand or on an
auto-coupling system.
Pump
The pump housing, motor top and impeller are made of cast iron (EN-GJL-250).
All surfaces of the cast iron parts are protected with cataphoresis coating.
The surface of the cast iron pump parts is afterwards painted with environmental friendly powder coating (type NCS
9000N (black), gloss code 30, thickness 100 µm) which ensures high impact and corrosion protection.
The final pump is assembled from already painted parts which ensures that no rust or scale can be formed in grooves
between parts, etc.
The S-tube® impeller is providing free spherical passage through the impeller and pump housing and creates a
natural extension of the pipework connected to the pump.
The S-tube® impeller is a wet-balanced and tube-shaped channel impeller placed in a pump housing that matches
the smooth tube shape leaving no obstructions or dead zones.
The key to the S-tube® design is simplicity, with no cutting or moving functions that can get worn over time, thereby
ensuring constant, superior efficiency. The simple design means lower life cycle costs because abrasive wear is
reduced and there are fewer clogging incidents.
The shaft seal consists of two mechanical seals that ensure a reliable sealing between the pumped liquid and motor.
The shaft seals are incorporated in a single-unit cartridge shaft seal system that is easy to replace in the field without
use of special tools.
The combination of the primary and secondary seals in a cartridge shaft seal system results in a shorter assembly
length compared to conventional shaft seals.
– Primary seal: Silicon carbide/silicon carbide (SiC/SiC)
– Secondary seal: Carbon/Ceramics
The shaft seal is bidirectional, meaning it operates correctly in case of backflow through the pump.