Pig Receiver/Launcher related terms
Pig Receiver/Launcher related terms
(OP)
I rarely involved in Pig Launcher/Receiver design.. Once I Involved i found terms such as "barred tee" , "end closures" and "Kicker line".
What i want to know what the definitions of them?,
Is there Kicker line have same meaning as "bypass line"?
Is there Barred tee have same meanins as "pig trap"?
Thank you for opinions and comments
regards
ZA
What i want to know what the definitions of them?,
Is there Kicker line have same meaning as "bypass line"?
Is there Barred tee have same meanins as "pig trap"?
Thank you for opinions and comments
regards
ZA





RE: Pig Receiver/Launcher related terms
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Pig Receiver/Launcher related terms
Your explanation was more than I expected. Informative
Regards
Zachari Alamsyah
RE: Pig Receiver/Launcher related terms
Typically you tend to see two pipe sizes bigger than the main line for the barrel size.
also try and avoid sloping the pig trap - Does very little and just gets in the way. Make the barrel flat.
See attached typical P & ID which has everything you possibly need. Whether you need double isolation is up to you depending on your isolation philosophy and pipeline engineers vary in their designs on this point.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pig Receiver/Launcher related terms
- Balancing line: I've seen it on drawings, but never in real life
- Actuated valves surrounding the barred tee (never seen either, let alone both. I have seen actuators on the barrel isolation valve, and seen the side valve tied into the ESD system, but never those two valves)
- Check valve on side: I don't know why you'd even want that
- Check valve on the purge connector turns a useful vent into a worthless connection (I put a vent there in case I get a small amount of leak by on the barrel isolation valve you can still launch a pig)
- Taking the PSV to flare is a dangerous waste of time (that PSV is usually sized for thermal relief, mL/min capacity)
- PSV on side valve: I've seen them rarely, but I don't know what code would require them
- Two drains is redundant, I don't even put one drain on a launcher and I have no idea why you'd ever put a spectacle blind on the drain lines.
You can't stop people from calling things whatever they want to call them. My approach has always been to call things by their proper name and if someone calls a "side valve" a "bypass" or the "bypass valve" on a receiver a "kicker" I just ignore their mistake and use the right name next time I speak.David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Pig Receiver/Launcher related terms
Balancing lines I design in and have seen them.
The SDV actuated is possibly a step too far, but I've seen plenty of ESD valves in that location. As the bypass valve (side valve) is often the operational isolation valve then it is commonly actuated, sometimes with the infamous "inching facility"
check valve I agree with you - not normally required
Purge connector NRVs- pretty common
PSV to flare - also is the primary vent down line For a fully liquid system would normally go to the closed drain system
PSV on bypass/side line - I agree
Two drains - I've seen two, especially on longer, larger traps just to get the flow working. If you have a liquid line and no drain, how do you open the door to insert a pig without getting your feet wet??
Bypass to me bypasses the pig trap so seems very logical. Side valve could be anywhere really.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pig Receiver/Launcher related terms
Major barrel: An enlarged section of the barrel used for loading or retrieving pigs
Reducer: A between major and minor barrel
Minor barrel: A section of the barrel between the pig trap valve and the reducer.
RE: Pig Receiver/Launcher related terms
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Pig Receiver/Launcher related terms
RE: Pig Receiver/Launcher related terms
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pig Receiver/Launcher related terms
- Have a pressure telltale as an integral part of the seal mechanism
- Be supported by hinges or davits that would prevent the closure from becoming a projectile in an open-under-pressure situation
- Be able to release pressure while still captured
This list is why I never specify Huber closures (since they fail on the first and last criteria) and always call for a Y-Yoke closure like the Tube Turns Y-Yoke closure, since the telltale is built into the locking mechanism and the outer seal ring releases pressure before the door can swing free.David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. —Galileo Galilei, Italian Physicist
RE: Pig Receiver/Launcher related terms
Zdas04, They look like good closures, but if you look at the latest question, he's talking about having the main pig trap isolation valves and the drain valve open at the same time(!) There are some very odd end closures out there alright, many scare the living daylights out of me ,a bit like this latest idea of dismantling safety equipment because it doesn't fit your perceived mode of operating....
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pig Receiver/Launcher related terms
RE: Pig Receiver/Launcher related terms
I understand what pigging involves, what you haven't said is why you apparently want to operate with the main pig trap inlet valve open and the drain valve open at the same time?? Your downstream system should be able to accept water and air if you're doing this sort of operation, not messing about with drains on a pig trap. Diverting to a slops tank is quite common.
Is this liquid H/C??
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pig Receiver/Launcher related terms
RE: Pig Receiver/Launcher related terms
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way