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

[smain06]

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

 

[Artisi]

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.

 

[SJones]

http://www.google.com/custom?domain...000000;GFNT:0000FF;GIMP:0000FF;FORID:1;&hl=en

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdoweb/

 

[d23]

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

 

[ShawnLu]

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.