Grundfos Submersible wastewater pump SL1.75.100.185.2.52S.N.51D.A

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 75 mm and is suitable for wastewater with a dry matter
content of up to 3 %.
A SmartTrim impeller clearance adjustment system makes it possible to maintain maximum performance. For
installation on auto coupling, the Grundfos SmartSeal gasket system provides a leak-proof connection.
The pump comes with a high efficient Grundfos motor built on IE3 motor components.
Further product details
Typical applications are transfer of liquids such as:
• drainage and surface water
• domestic wastewater
• municipal wastewater
• industrial wastewater
• process and cooling water.
The pumps are ideal for pumping the above liquids from places such as:
• municipal network pumping stations
• inlet pumping stations in wastewater treatment plants
• primary clarification pits in wastewater treatment plants
• secondary clarification pits in wastewater treatment plants
• stormwater pumping stations
• public buildings
• residential buildings
• factories and industry.
The pump is suitable for both temporary and permanent installation. The lifting brackets fitted on the pumps enables
easy transportation to and installation on the site.
Pump
The pump housing and motor top are made of cast iron (EN-GJL-250) and the impeller is made of ductile cast-iron
(EN-GJS-500).
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 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.
This pump is equipped with the unique SmartTrim impeller clearance adjustment system that enables easy restoring
of factory-set impeller clearance.
By tightening the adjustment screws on the exterior of the pump housing, peak pumping efficiency can be
maintained.
This can be done on site, quickly and easily, without dismantling the pump and without using special tools.
The shaft seals of the pump consist of two mechanical seals that ensure a reliable sealing between the pumped liquid
and motor. The shaft seal is a cartridge seal that enables easy service.
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. Furthermore, this design minimises the risk of incorrect fitting and can
be installed on site without the need for special tools.
– Primary seal: Silicon carbide/silicon carbide (SiC/SiC)