×
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

Relief Header Question

Relief Header Question

Relief Header Question

(OP)
This should be simple...just need some clarification.  Thermal relief valve (bellows)on a 4" pipe (150# spec), flammable material.  Valve is 1x2, 3 gpm required capacity.  Relieves into larger pipeline (not technically a relief header) that is 8" (150# spec).  This second pipeline is a feed line to a storage tank of the same relieving material.  

So, there is 100 psig constant back pressure (feed pump) and that is calculated into the design...but, the 8" feed line can be blocked in.  

Should I recommend that the feed line block valve be car-sealed open so that there is a relief path to the storage tank or is the small relief flow not enough to cause a problem with the larger 8" line?

RE: Relief Header Question

RV is feeding the tank (presumed operate at ATM). Why the constant back pressure is 100 psig ? Any sketch to clarify ?

If the 8" feed line can be blocked in then there is no clear relief path for the relief valve. CSO or LO is required. You wouldn't pass the HAZOP...

 

JoeWong
Chemical & Process Technology

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