3 replies to this topic

[giseledall]

Hi everyone!

 

I am trying to specify relief valves to be installed at the discharge of dosing pumps (chemical injection at petroleum platforms). All pumps are for very low flow (from 6 l/h to 900 l/h) and high pressure (from 275 barg to 640 barg) and I think I could use non-ASME PSVs, like Swagelok, but my chief insists that we need to apply ASME VIII PSVs.

I understand that valves with ASME VIII certificate will be oversized.

Could you help me, please?

 

Thanks!

[latexman]

You are correct.  Why would you use ASME VIII PSVs on piping?  Consult the piping standard you are using, B31.X or other.

[fallah]

giseledall,

 

If the governing code of your system is ASME VIII, your chief is right and you have to use a code valve; i.e. a valve that has already undergone capacity certification per ASME testing procedure.  But you don't have to use an API 526 valve (D-T orifice designation) and you can refer to the Red Book (Code Certified) to use a smaller code valve that isn't necessarily an API 526 valve...

[giseledall]

There is no information on the documentation received from client about code requirements, but when the classification society checked our documentation, they asked about code valves. So, though I think we don,t need code valve, I don,t have any document to support my point of view.

My fear is that a PSV oversized could operate badly and not protect the system satisfactorily.

 

Thanks fallah and latexman for your answers.