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Plate thickness for end of pipe Hydrostatic Test

Plate thickness for end of pipe Hydrostatic Test

Plate thickness for end of pipe Hydrostatic Test

(OP)
Kindly give me a calculation of plate thickness to be used for hydrostatic test..

RE: Plate thickness for end of pipe Hydrostatic Test

carlo....I would generally suggest that it would be helpful when you ask a question if you would give a bit of information along with it; however, you seem very unfamiliar with hydrostatic testing, which can be very dangerous if not done properly.  I would suggest that you get someone locally, who is familiar with hydrostatic testing, to assist you.

As BigH suggests, if you have a flanged connection, a blind flange will already be sized for your pressure application according to the flange class and the pipe class. If you are just using a blocking plate, get someone local to help you as it will entail thickness design and weld design.

RE: Plate thickness for end of pipe Hydrostatic Test

Don't even think of welding a flat plate to the end of your pipe to hydrotest.

RE: Plate thickness for end of pipe Hydrostatic Test

You can also use a weld cap, then cut it off after the test.

RE: Plate thickness for end of pipe Hydrostatic Test

Well, yes, a welded-on cap could be used, but then you get into the circular logic of having to cut off a perfectly good, temporary tested joint, and then re-welding that same joint into the permanent configuration, then having to re-test the final joint you just welded.

it would be valid only for a shop test - but then the final hydro reqmt is still not met.   

A operational pressure test with the operating fluid is OK to accept a bolted (flanged) joint if the piping system welds have been hydro'ed, but the higher hydro test is required for your butt-welded joints at some point in time.   Or a 100 percent X-ray.  Or both - depending on your insurance/pressure/temperature.   HP/HT Steam, LT/HP main feed water, LT/LP/flammable turbine lube oil, and low temperature low pressure condensate water will have different requirements when new pipes are added.

 

RE: Plate thickness for end of pipe Hydrostatic Test

(OP)
Ron, i appreciate your concern. I am familiar in hydrostatic testing but of course I am not familiar in special case like this. If I will ask some local consultant, I think I don't need to raise this question in this forum.
The reason I need the calculation is because we need to fabricate blind flange from the steel plate.

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