Pig launcher and receiver valve selection?
Pig launcher and receiver valve selection?
(OP)
Hello everybody!!
What kind of valve should be used as a mainline trap valve
at a pig launcher and receiver(6"x8")?
Is a ,full bore, ball valve better to use,than a gate valve for pig traps?
Any help would be appreciated!
What kind of valve should be used as a mainline trap valve
at a pig launcher and receiver(6"x8")?
Is a ,full bore, ball valve better to use,than a gate valve for pig traps?
Any help would be appreciated!





RE: Pig launcher and receiver valve selection?
Further, I always specify trunnion ball valves for the barrel-isolation valves (over floating ball valves) because they give you two seating surfaces between the line pressure and the trap - it can be a real pain if the barrel-isolation valve leaks through while you are trying to launch a pig.
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The Plural of "anecdote" is not "data"
RE: Pig launcher and receiver valve selection?
Would you suggest this valve to be pneumatic, gear&pneumatic or just gear operated??
Thanks again for your time!
RE: Pig launcher and receiver valve selection?
The sequence I require for launching valves is (starting with the trap isolated and blown down, see my web page under "Samples" "Rules of Thumb for Gathering Equipment" for a description of what I think should go into a launcher design):
1. Load pig
2. Open kicker
3. Open barrel-isolation valve
4. Shut side valve
5. Re-open side valve after pig has left
6. Shut barrel-isolation valve
7. Shut kicker and blow barrel down.
With that sequence you never have any dP across the big valves so I think an actuator is a waste of money and an addition of unnecessary complexity.
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The Plural of "anecdote" is not "data"