PRESSURE DROP DURING HYDROSTATIC TEST OF PIPELEINES

Dear Friend

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In the area I live in, the government regulator of oil and gas pipelines has the final say on how much of a pressure drop is acceptable, and under what conditions.

Is there some local or national standard in effect in the area you are working in that you could refer to?

My definition of hydrostatic would be a no flow situation with nothing but liquid in the pipeline. Based on my understanding you should be able to calculate the pressure drop per installed footage of pipe if it's a very large system and find pressure points that corelate to installed guages. This could be transferred to a map of plan and used to document any loss of pressure in a section. In the steady state youwill not have to figure flow pressure loss. if the entire system in steady state does not lose pressure once you've stopped pumping it up. You should be leak free or at least a measure of leakage. As to the temperature influence I would think you could start with checking the temperature and recording drop along with other influences such as weather and ambient temperatures and get a handle on the effects of temperature. This is from a pipefitter at 10,000 feet.

The <...PRESSURE DROP WHICH CAN BE ALLOWED...> can be judged from the records that are produced <...EVERY YEAR...>, as, logically, they have been <...ALLOWED...> in previous years.

A <...TEST...> without a pass/fail criterion having been determined before hand isn't a <...TEST...>; it's a "measurement".

Go back to the records and assess the pass/fail criterion there, preferably having turned off Caps Lock first, as many consider it akin to SHOUTING, and rather rude.

Establish the correct <...TEST...> pass/fail criterion before proceeding further, preferably by taking the advice of the Engineer/Surveyor for the company providing burst/collapse indemnity insurance cover on the equipment first. Do turn off Caps Lock before making the phone call.