Grundfos S Series - Submersible and dry installed
pumps for aggressive environments
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Select from four basic versions
(1.1 kW – 520 kW)

In addition to cast iron, you can choose between the following four versions of the S, SL, and SE pumps in
stainless steel.
Typical applications

The Grundfos ranges of stainless steel SL, SE and S wastewater pumps with large free passage ensure that
you always have the correct pump built with the right materials for the application. All pumps can be further
customised, depending on your requirements and the media to be pumped.
One of two SE pumps for pumping wastewater
containing chemicals with large variations in pH
from the CIP process at a dairy producing cheese.
One of two S pumps used at a glass wool
manufacturing plant for pumping process water
with a high content of abrasive particles.
Why corrosion and erosion is an issue

There are a number of environmental variables that affect the corrosion resistance of metals and alloys,
not least that all types of materials and coatings inevitably deteriorate at a given rate of corrosion or
erosion. Furthermore, in a corrosive environment, erosion can further accelerate corrosion of the pump.
This deterioration must be considered and calculated into the expected lifetime for the pump.

The causes of corrosion
Corrosion is the deterioration of a metal caused by a reaction with its environment. Corrosion of a pump
involves the loss of metal and occurs in various forms ranging from a generalised attack over the entire
surface to a severe concentrated attack, which eventually can cause the pump to fail.

A variety of different media and the specific environment can induce corrosion of a pump. These include:
> pH
> Oxidising agents (such as oxygen)
> Temperature
> Concentration of solution constituents (such as chlorides)
> Biological activity
> Operating conditions (such as velocity, cleaning procedures and shutdowns)
> Chemicals

In situations where metallic parts are exposed to these environmental variables, stainless steel is
considered more corrosion-resistant than cast iron. This is due to the fact that stainless steel contains a
defined minimum content of chromium, and this chromium content promotes the formation of passive,
invisible oxide film on the surface that prevents surface corrosion and protects the metal beneath.

How erosion happens
Erosion by particle impingement can be damaging to pump parts by itself and it can furthermore accelerate
corrosion in aggressive environments. Erosion is a localised process that constantly removes material from
the pump parts.

Erosion occurs primarily in areas with high velocity and turbulent flow, and it is thus typically seen on
impellers and volutes. Stainless steel has an erosion-resistant oxide film on the surface, which makes it
more resistant towards media with a high content of abrasive particles, compared to standard cast iron
pump parts.
The right material for optimum resistance

The following graphs are intended as a general guide for selecting the suitable pump materials for your
specific application, evaluated according to pH value, chloride concentration and wear. The suitable pump
variant should be selected from a cross-reading between several of the graphs.

For final specification and selection of your pump, exact media data and variations should be obtained.
Grundfos can give you further support to match pump materials to the media to be pumped.
pH
The pH value is a good indicator for corrosive behaviour, however pH is insufficient on its own to evaluate
a media as its composition and variations must be considered before final pump configuration.
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