×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

check valve Vs piggability

check valve Vs piggability

check valve Vs piggability

(OP)
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
 

RE: check valve Vs piggability

There is no Check Valve that can be "Pigged"

RE: check valve Vs piggability

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

RE: check valve Vs piggability

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

RE: check valve Vs piggability

(OP)
Thaks very much to everybody!

Stefano

RE: check valve Vs piggability

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

RE: check valve Vs piggability

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*

RE: check valve Vs piggability

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

David

RE: check valve Vs piggability

"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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources