×
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

Which medium to use?

Which medium to use?

Which medium to use?

(OP)
Hello,

I am currently designing the safety valve for a gasfilter system. My sizing case will be when the blowback valves (of the cleaning system) will fail.

The filtervessel itself is approximately 35 m3 and filled with the process gas.

When the blowback valve fails, approximately 200 kg/hr / 165 Nm3/hr of plant air might set off the PSV. What is the medium I will design my PSV for?

Thank you for thinking along in advance!  

RE: Which medium to use?

Enkelaar, first I suggest checking to see if it's safe for this process vapor to be suddenly mixed with air. It depends on the fluid, but in most cases that will generate the risk of a flammable mixture. If so, that's a scenario you probably ought to prevent from happening, by using a SIS or HIPS.

Back to your original question.....the PSV should be sized for the fluid(s) that will actually pass through the valve during the worst case scenario. In cases like this you might have one scenario involving process vapor and another involving air. The PSV size must be based on the scenario that requires the largest orifice.  

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