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Join Date: Feb 2017
Posts: 12

Regarding Test

02/16/2017 1:38 AM

hi .,

i am newly joined in piping sector. in pressure test , if we have pressure reducing valve, check valve, in pipe line. whether shall we have to remove those thing for pressure test?

if we remove then we have to install it back again. for installation again we need to loosen the bolts of temporary spool. so we lost a pressure proof over the mechanical joints. how to assure that it will be good enough at required testing pressure ?

pls help me to get cleared

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#1

Re: regarding test

02/16/2017 2:38 AM

This is an interesting, and perhaps complex, question. If there is a way to adjust the pressure reducing valve to zero reduction, then the downstream piping can be tested to the full available pressure. A small bypass line and valve could manage this, also.

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#2

Re: regarding test

02/16/2017 3:18 AM

Ask the Engineer/Surveyor from the Insurance Company that is supplying burst/collapse indemnity insurance, as this individual will want to witness the test and will determine how it is to be set-up before arrival.

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#3

Re: Regarding Test

02/16/2017 11:14 AM

There are no energy removing bypass lines around these devices? Those IMHO should be there for lock-out/tag-out purposes during any repair or testing work.

Bypasses also assist in setting up test parameters in the system without interfering with spool in bolting.

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#4

Re: Regarding Test

02/16/2017 12:11 PM

Why don't you just copy the entire test and show us all at once?

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#5

Re: Regarding Test

02/16/2017 1:33 PM

You could perform the pressure test from the downstream section of piping from the check valve if you have an access point.

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#6

Re: Regarding Test

02/16/2017 3:43 PM

How was it done the last time it was done?...

That wasn't necessarily the correct way, but someone there should at least be able to tell you that way...

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#7

Re: Regarding Test

02/17/2017 4:42 AM

Water column. Regarding Test. What has your employer with regards procedures and what has your commissioning team got available?

Decide if you are testing a system or a pipe. Are you testing the integrity of the weakest points; flanges and seals?

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