Hydrostatic Testing Of Buttweld Fittings

please note: your high psi limit is only going to be as great as your lowest rated component. The pressures you are describing are enormous.

May I ask what kind of system you are working on?

Dear friends,

I had noted your poins,thank you.

Actually, I wanted carry out this kind of test, in order to et registered our buttweld fitting made as per asme b16.9 duly forged & machined. so I had submitted my dimensional catalog ,list of matl. is used and the calculations of hyd.testing as per ASME B16.9. The concern authority said you calculations are correct but now, you have to prove the same by carry out test and submit the report in order to get approval .(CRN)

We have got there approval for our flanges form 1/2" to 48" - 150# to 2500# as per ASME B16.5 & 16.47.

Thank you.

v.d.deodhar.

Piping is normally tested at 1.5 times the maxmum operating pressure / Design pressure unless the operating temp. is high enough to reduce the allowable stress in which case the allowable stress to be considered will also be lower giving higher wall thickness. Also in such a case the test pressure at ambient temp will become higher.

Hence I don't understand why do you need to test the fittings at proof test pressure.

Surely fittings don't need to be tested individually? To do so would overlook the joints and other clutter needed to join everything together. Wouldn't it be better to proof-test the entire system as an assembled entity by demonstrating it to the satisfaction of the local insurance company's inspecting engineer?