MOVs in Hydrotesting

[mike mufdi]

We are installing a new oil manifold which has MOVs in inlets and test header outlets, Contractor is insisting on including the MOVs in the hydrotest of the manifold. is there any precautions needed or are we putting the valves in any serious danger by not dropping the valves? Project designed on ASME B31.3 and shell DEP. class rating 1500lb , testing at 340barG

 

[LittleInch]

Assuming the valves are open, your issue will be leakage out of the stem seal. They are usually only good for 1.1 x design pressure.

But not normally done this easy.

Also it's not 1500lb, it's Asme b16.5 class 1500....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Dhurjati Sen]

Take same precautions as that mentioned for block valves in Shell DEP.

DHURJATI SEN

 

[mk3223]

The Contractor can't be responsibe for the MOV damage if hydro testing with the piping in the field.

Since MOV has been fully tested in the shop similar to the control valve, it doesn't required in the piping hydro in the field.