check valve Vs piggability 1

[fuz83]

Does exist a check valve type which keep the piggability (gel pig) of the line where it is installed? (could it be useful a flapper valve type?)

Thanks,
Stefano

 

[pennpiper]

There is no Check Valve that can be "Pigged"

 

[BigInch]

Tom Wheatley full swing check valves are piggable.

http://www.c-a-m.com/forms/Product.aspx?prodID=6f85297c-23c0-479a-9389-c3fd38bebd34

http://www.scribd.com/doc/46921788/Wheatley-Swing-Check-Valves

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[dcasto]

I would think a gel pig would go through a flapper check.

 

[zdas04]

Been there, done that, I have both the tee shirt and shreaded pig. We looked at the specs and came to the same conslusion that BigInch and dcasto came to, that it could be done. We didn't run a gel pig, we ran a low-density poly coated foam pig. We picked it up with a rake an shovel--we removed the check valve and got bits and pieces of that mess for 6 months.

I personnaly wouldn't do it again. If I got pushed into it I'd run something like a turbo pig that can tolerate a lot more abuse (might take 50 psid to push the pig through the valve, but it can be done).

David

 

[fuz83]

Thaks very much to everybody!

Stefano

 

[BigInch]

Don't do it with cotton balls either, but a hard rubber ball pig, a scraper pig, a brush pig, a ribbed for your pleasure pig, or smart pig will all make it through a Wheatley check.

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[11echo]

I've seen mainline check valves on pipelines pigged! The ones I'm thinking of are on the Alaskan pipeline and they are swing checks. Although they did stick a "smart pig" at check valve #55 back in 79 ...that was a fun fix! *G*

 

[zdas04]

I guess it works better in 48" lines than in 8" lines. I'm betting the pigs were pretty substantial too.

David

 

[BigInch]

"Elephants" or crocodiles might have been better words, although I suspect PIG comes from a rearrangment of "pipe-gaging-inspection" ???.

The swing checks can be mechanically held in the open position to assist in passing a big one when necessary, but sometimes you cannot avoid an occasional cutout when luck (and everything else) goes against you.

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus