Flanged PSV versus threaded
Flanged PSV versus threaded
(OP)
I need to install a PSV in Nitrogen line. A different model relief valve was received (27EA34-120 is flanged) instead of 27EA34-M20, which is threaded.
Would it be okay to install a flanged PSV in nitrogen service?
Would it be okay to install a flanged PSV in nitrogen service?





RE: Flanged PSV versus threaded
Sometimes its possible to do all the right things and still get bad results
RE: Flanged PSV versus threaded
The question is why the "threaded" PSV allowed for the N2 system in your plant.
RE: Flanged PSV versus threaded
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: Flanged PSV versus threaded
Our piping spec allows thredded piping for 1.5" diameter pipe or smaller.
RE: Flanged PSV versus threaded
You have answered your own question.
You say your piping specs call for piping 1-1/2" and smaller to be threaded, then you can use a threaded PSV.
Sometimes its possible to do all the right things and still get bad results
RE: Flanged PSV versus threaded
Thanks for your input.
RE: Flanged PSV versus threaded
Is the added threaded piping in the spec for the N2 specifically? Was the fitting designed for using in the certain process fluid?