Pre-Launching inspection
Pre-Launching inspection
(OP)
Please guys will need assistance on a pre-launching inspection(steps) done prior to launching a pig. Thanks.
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Pre-Launching inspection
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Pre-Launching inspectionPre-Launching inspection(OP)
Please guys will need assistance on a pre-launching inspection(steps) done prior to launching a pig. Thanks.
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RE: Pre-Launching inspection
Each system is different (is it gas or liquid) and has different issues. Use of the P & ID to come up with a procedure using valve numbers is recomended using the following basic parameters.
Assuming you know how to safely de-pressurise, drain or vent your trap, with all isolations locked closed then:
Insert pig and push as hard as posisble into the neck of the trap.
Close the door and ensure full sealing
Pressurise / fill slowly, ensuring that there is piping connection (equalisation line) between the space infront of the pig and behind it
When fully pressurised / full open pig trap kicker lines fully open.
Open main valve
close main bypass valve
pig should leave trap
Have some checks, person hear / feel the pig go through the first tee / valve, pref with magnetic pig sig.
close pig trap valves, islate pig trap, de-prssurise / drain, open oddr to ensure pig has actually left....
If you can't close the main valve - maybe pig is stuck in main pig trap valve(!)
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pre-Launching inspection
Cleaning pig launching is normally a bit less critical.
Independent events are seldomly independent.
RE: Pre-Launching inspection
If you don't really know whats there then start with a flexible pig (foam), then gradually get more aggressive to check for bend radius, wall thickness change etc and run a guage then a caliper / orientation pig.
killer things are unbarred tees, <3D bends, change of diameter and internal objects (e.g. thermowells)
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pre-Launching inspection
Independent events are seldomly independent.
RE: Pre-Launching inspection
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pre-Launching inspection
Independent events are seldomly independent.