×
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

Commissioning LPG pipeline

Commissioning LPG pipeline

Commissioning LPG pipeline

(OP)
Hello all,

With reference to my earlier thread:
http://www.eng-tips.com/viewthread.cfm?qid=354614

as a result of the stuck pig in C4 pipeline, another pipeline is to be used for C4.
This line is currently used for fuel gas.
Can you please help me on how to commission C4 pipeline that has fuel gas.

RE: Commissioning LPG pipeline

How did you get on with the pig?

Commissioning should relatively simple - pressure the gas to the minimum pressure you need to maintain liquid state of the C4, put a pig in and then pump C4, maintaining the gas pressure at the receiving end until the pig arrives.

Might be a good idea to run a couple of clenaining pigs in the gas line before you do that....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: Commissioning LPG pipeline

(OP)
Hi LittleInch,
Thanks for your continuous help.

The pig is still stuck, they have decided to force it to move by creating the pressure drop I discussed earlier. At the same time they will have the fuel gas line to be used in case of any need. We will see how this issue will end.

We already ran the cleaning pig, and the fuel gas line is clean. It is pressurized up to 400 psig currently.

We keep a pressure of 120 psig usually for Butane at the terminal end. So I was just thinking of depressurizing the fuel gas line to that pressure and then lunch the pig. Is this ok?
Also, what happens if I just depressurize the line to 120 psig and start pumping butane without sending a pig? Is this to do with the pipeline topography?

RE: Commissioning LPG pipeline

Ummm, I wouldn't stnad anywhere near the pipeline when they're trying that...

Yes, you can de=pressurise, but try to keep a reasonable margin. You need to use a pig otherwise you will create a two phase pipeline which will slug and surge and deliver gas with your butane for some time after the pig has arrived.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

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