Overview
The document provides detailed information about Grundfos SL, SE, and S pump variants designed for aggressive environments. These pumps are suitable for handling wastewater, process water, seawater, and unscreened raw sewage, and are made from high-grade stainless steel to ensure durability and reliability.

Specifications
The pumps are available in power ranges from 1.1 to 520 kW and can be installed submerged or dry. They are constructed to resist corrosion and erosion, with specific variants offering different levels of stainless steel protection.

Applications
Typical applications include water intake for desalination plants, cooling in power plants, process water for fish farming, and wastewater management in industrial settings. The pumps are also suitable for environments with high chloride levels, such as coastal areas.

Material Variants
- Variant R: All parts in contact with media are made of stainless steel EN 1.4408, with the shaft upgraded to EN 1.4462.
- Variant D: Critical parts are upgraded to EN 1.4517 for casted parts and EN 1.4539 for plate material.
- Variant Q: Stainless steel impeller in EN 1.4408, with a cast iron volute and motor housing.
- Variant S: Stainless steel hydraulic parts in EN 1.4408, with the shaft upgraded to EN 1.4462.

Corrosion and Erosion
The document explains the causes of corrosion and erosion, emphasizing the importance of selecting the right materials to prevent pump failure. Stainless steel is highlighted for its corrosion resistance due to its chromium content, which forms a protective oxide film.

Protection Strategies
Coatings and sacrificial aluminium anodes are recommended for additional protection in environments with high chloride levels. Regular inspection of coatings and anodes is advised to maintain protection.

Graphical Data
The document includes graphs to guide the selection of pump materials based on pH value, chloride concentration, and wear resistance. These graphs are intended for preliminary specifications and should be used with caution, considering specific media compositions.

Conclusion
Grundfos pumps are designed to provide reliable operation in aggressive environments, with customizable options to match specific application needs. The document emphasizes the importance of material selection and maintenance to ensure long-term pump performance.