Thank you all for your comments,
Mr. Failure, you are the most guy who could understand me..
anyway I showed it to a corrosion specialist and he commented it looks like hydrogen crack
it's easy to say send to metallurgical lab, but what kind of test and what is the target of testing? what are the suspected mechanism?
I am waiting for experts !
Spring is always live
There is no much salts in the treated water
Conductivity is 6400 micro simens/cm
Chloride < 2000 ppm
There is no indication of bending or permanent deformation
Oxygen < 10 ppb
I dont think 17-7 PH is not suitable for this service
What kind of metallurgical testing will...
Hi,
we are suffering from PSV spring crack
Material: 17-7 PH stainless steel
operating temperature: 221 F
set pressure: 1760 psig
size: 2"
service: boiler feed water, good quality and well treated
There is some corrosion in the spring but it is not on the carbon steel piping!
See attached...
