×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Compressor Suction Relief

Compressor Suction Relief

Compressor Suction Relief

(OP)
Should compressor suction drum relief valve always be checked/sized for compressor recycle valve failing open scenario.

RE: Compressor Suction Relief

I would say that it is never wrong to check any viable scenario, but in terms of sizing the only accumulations into the suction drum would be the fresh feed and the power input from the compressor.  The amount of fresh feed coming into the system during a relief case should be known to you. Since the recycle flow to the drum ultimately comes from the drum, there is no additional material accumulation due to the recycle, however, the power input of the compressor could be significant- i.e. in the extreme case of total spillback without an aftercooler, the entire power input will be manifested as a temperature and pressure rise. Even if there were no fresh material entering, the energy input would have to leave the system through the PSV.

These are just my thoughts. Best wishes, sshep

RE: Compressor Suction Relief

If the recycle valve wide open has greater capacity than the compressor you could get additional backflow from the high pressure system.  That is something that will need to be checked as well as what other safeguards you may have to address backflow.  Even if it turns out that it is not a sizing basis for the relief valve, you might as well include that in you relief system documentation that you looked at it and found it to be no concern.

RE: Compressor Suction Relief

Good point about the backflow EGT01! -sshep

RE: Compressor Suction Relief

If the recycle valve fails open then there should not be any pressurisation of the compressor suction. If the compressor is considered as a black box then taking all the discharge to the suction stops the flow of gas into and out of the box but does not increase the contents (and therefore pressure) in the box.

The risk of backflow through the recycle from the discharge system into the suction system should be considered during the design and suitable precautions taken to prevent problems in the lower pressure system - installation of NRV, slam-shut valve etc.

Suction drums should be rated for settle-out pressure when the compressor is stopped.

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close