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how to choose materials for the internal parts of the submerge pump

how to choose materials for the internal parts of the submerge pump

how to choose materials for the internal parts of the submerge pump

(OP)
I would like to know how to choose materials for the internal parts of the submerge pump.
this pump will be use in the sea (salt problem)
please help
thank you

RE: how to choose materials for the internal parts of the submerge pump

It will depend on what life you need from the pump unit giving 2 choices: cast iron or stainless steel, although you could use bronze but are usually difficult to source.

Are you talking about an electric submersible pump or just a submerged wetend, also - what size pump unit are you considering.

RE: how to choose materials for the internal parts of the submerge pump

RE: how to choose materials for the internal parts of the submerge pump

smain06

I think you will find for seawater that the salt content is not the problem; it’s the oxygenated water.  I would suggest duplex stainless or Nichol – aluminum – bronze impellers.  

D23

RE: how to choose materials for the internal parts of the submerge pump

The cheapest choice should be GG25 hydraulic parts and pump/motor casing with Zinc Anodes fixed on the pump body/suction or impeller channel. Seal parts using the Viton material. Do remember that Zinc anodes are required to replace every half or one year. A good maintenance insure a long lifetime of the pump which is substantiated in many projects.
If cost is not the most important factor, Ni-Al-Bronze material is perfect. It was commonly used on marine fire-fighting ships.

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