Pig bypass
Pig bypass
(OP)
I need a formula to help me disign the proper bypass on a pig i know how much gas,oil and water go into the line, what happens is when i send the pig the plant gets hit hard and we usually cause a upset is there any way to design this so this does not happen and i do not have to shut in production to accomdate sending the pig, also need to know for waxy lines so i dont get a build up in front of pig.I know to much bypass will cause pig stalling. Many thanks for any input.





RE: Pig bypass
I think the point you may be missing is that a pig must have a differential pressure across it to push it down the line which may be your real problem. If the line contains wax then the differential pressure may be even higher than normal. Hence, the pressure bump of the pig going through may be causing operating problems in the facility.
This a general answer but perhaps if you provided some more details then the forum could be more helpful. Be sure to describe what type of pig you are using.
RE: Pig bypass
RE: Pig bypass
installing a bypass, as you described, will not serve any purpose.
installing pig signals in piping system for monitoring pig location would help.
RE: Pig bypass
Integral bypass with pig is not likely to achieve your goal - ports would block, particularly with waxy lines - back to square one, and if it did work, then you are basically leaving liquids in the line which kind of defeats the purpose.