×
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

Re-Calibration of Pressure Relief Valves & Vacuum Breakers

Re-Calibration of Pressure Relief Valves & Vacuum Breakers

Re-Calibration of Pressure Relief Valves & Vacuum Breakers

(OP)
Good morning,

We have 4 - 67,000 gallon Aqueous Ammonia storage tanks with a 1" inlet - 150# raised face flange, 2" outlet RFFL pressure relief valve. It is set for 30 psi to vent to a safe location.

My question is besides initial calibration by the manufacturer , how often will the plant need to re-calibrate a valve like this ? Everything I have found in ASME Sec. VII , Div. 1 has talked about the manufacturer's requirements but I can't find anything about maintenance.

The same question applies to the vaccum breakers - It is an OCECO 2" inlet 150# RFFL - set at -0.2 psig.


Thank you for your time.

RE: Re-Calibration of Pressure Relief Valves & Vacuum Breakers

You'll NEVER find maintain & run info in Sect VIII - it is a design & build Code {only]. National Board and API recommend a maximum 5-year interval for PRV's between each Test & Reset. API further suggests that 10-years, based on the Test & Reset history of PRV's in benign service may be acceptable. Ammonia is not considered benign, unless the discharge is captured in a flare/vent header.

Your OCECO is probably a Vacuum Conservation Vent, with a pallet that rises to give the venting. It's an API device, but there is no Reset, just an internal Inspx for debris, bad gaskets, etc. And ensure that the necessary pallet weights [if any] have not been changed.

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