Pressure transmitter with diaphragm seal for very high salinity application
Pressure transmitter with diaphragm seal for very high salinity application
(OP)
I have to use a pressure transmitter with a flanged (Raised Face rating 600#) diaphragm seal on a the on the outlet of a well. The material engineer specified that the wetted parts shall be Hastelloy-C, so i chose the diaphragm material to be hastelloy-C. What should the diaphragm seal flange material be? should it be Hastelloy-C as well ? or is it ok to use a carbon steel flange, and rely on the gaskets to make the process fluid does not contact the flange ?
Also note that i can not use 316 SS flange because this will lead me to increasing the rating to 900# instead of 600#, as piping is working at the edge of rating 600# for carbon steel.
With regards to carbon steel, i am worrying about galvanic corrosion between the seal carbon steel flange and the hastelloy-C flush ring.
What do you think ?
Also note that i can not use 316 SS flange because this will lead me to increasing the rating to 900# instead of 600#, as piping is working at the edge of rating 600# for carbon steel.
With regards to carbon steel, i am worrying about galvanic corrosion between the seal carbon steel flange and the hastelloy-C flush ring.
What do you think ?





RE: Pressure transmitter with diaphragm seal for very high salinity application
RE: Pressure transmitter with diaphragm seal for very high salinity application
In general, is it a standard solution to use a rubber coated diaphragm seal flange or a hastelloy-c flange? most catalogues like emerson specify hastelloy-c for their diaphragm and 316 SS or CS for the flanges. why would some one select CS or 316 SS flanges with hastelloy-c seal if the process fluid requires the use of hastelloy-c wetted parts ?
RE: Pressure transmitter with diaphragm seal for very high salinity application