×
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

Reduce Gas Spikes to Flare when Pigging

Reduce Gas Spikes to Flare when Pigging

Reduce Gas Spikes to Flare when Pigging

(OP)
We are investigating installing an isolation device in Flareheader to aid gas recovery. Isolation device is likely to be an in-line  buckling pin, with a pressure control valve in a by-pass for upstream pressure control. The control valve would be sized for the "normal abnormal" flows of gas, so that the isolation device is only activated by relief events, or those events with an equally low frequency.

Unfortunately, the approximately weekly pigging operation generates "spikes" of gas flow which is fine for the present operation, but which would tend to cause the isolation device to be activated in the new situation.

Are there any ideas out there on how I might modify our pigging operation, attenuate the flow/ pressure spikes, or otherwise deal with this gas generated during pigging?

thank in anticipation.

RE: Reduce Gas Spikes to Flare when Pigging

We've increased the pigging frequency, that smoothed over the gas flow deviations in each "spike".

but this depends on your system. Please describe it more detailed.

RE: Reduce Gas Spikes to Flare when Pigging

(OP)
more details of pigging system for joisy:

Pipeline comes into a pig receiver. Just upstream of the receiver is a barred tee. when the pig has moved past the tee, the oil/gas passes through tee branch to separator. The barring prevents the pig from going to the separator.

The separator level is normally controlled by means of a control valve in this inlet line. At times of pigging, this control system is in manual with the valve shut. On pig arrival, the valve is opened slowly in manual by the operator to avoid flooding the separator and prevent the system being overwhelmed by too much gas being released (on pressure let down), whilst st the same time trying to maintain a decent production rate.

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