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Carbon Steel to Stainless Steel Flange connections

Carbon Steel to Stainless Steel Flange connections

Carbon Steel to Stainless Steel Flange connections

(OP)
Is it possible to connect a stainless steel flange to carbon steel flange (24" piping) with river water as the flowing fluid? what type of problem would the flange connection experience? do I need insulating kit? any help would be appreciated

RE: Carbon Steel to Stainless Steel Flange connections

You can expect contact corrosion between stainless steel and steel especially if water is involved. So, any insulation between the flange contact surfaces is recommended. Can't you coat the steel flanges?

RE: Carbon Steel to Stainless Steel Flange connections

(OP)
Its desired to install insulating flange gasket kit. But how would the corrosion affect the stainless steel surface?

RE: Carbon Steel to Stainless Steel Flange connections

Not much as the steel part will mainly corrode. It is the ignoble metal.

RE: Carbon Steel to Stainless Steel Flange connections

Remember to use an insulating gasket as well. It needs to be a thicker gasket, because the water can act as an electrolyte, creating a bridge between the two flanges, giving the opportunity for corrosion.
Thus a bolting and gasket insulation kit is recommended.

RE: Carbon Steel to Stainless Steel Flange connections

(OP)
Thank you all for the help

RE: Carbon Steel to Stainless Steel Flange connections

Remember: if you do use a coating, coat the stainless steel only!!

Study NACE SP0286 for isolation guidance.  

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04
 

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