Trying to do a root cause analysis of a pre 1974 2inch WKM gate valve. Dont really have enough information to help get this completed satfisafcatory.
My question is does any one have any experience with stem failure of this valve and causes.
I have found through research that 2inch valves are...
This is the likely composition of the stream that enter into the economiser
Inlet gas 250C ,40psig
compositon : Nitrogen 65% ,water 15% ,NO2 13% ,O2 7%
Boiler water treatment :
Pre-treatment
Lime softened
Base exchanged
Dearation...
is it better to buy a nitric acid plant economiser made of carbon steel than one made of zirconium.?
if the temperatures in the economiser are about 120C
