×
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

custody transfer metering requirement for double block and bleed valve

custody transfer metering requirement for double block and bleed valve

custody transfer metering requirement for double block and bleed valve

(OP)
I am working on  projects for ship loading facilities, custody tranfer.
All systems I have seen so far has double block and bleed valves up and down stream of the meters. Most experts explain that it is in OIML, API or MID -> nobody can point it out.
the only phrase I found is regarding bypassing the meter.
Does anybody knows why these expensive valves are applied?  

RE: custody transfer metering requirement for double block and bleed valve

Probably so you can take the meter out easily for periodic testing. The double block and bleed arrangement is often for safety reasons.
Regards
Roy

RE: custody transfer metering requirement for double block and bleed valve

I've seen a DBB requirement for meter station bypass lines (i.e., you lock both valves shut and the bleed open to have certain proof that all the product is being measured).  DBB on the meter station inlet/outlet is not required by any code or safety regulation.  If you are doing hot work on the meter run (never allowed by measurement practices) then DBB might be needed, but for fiscal isolation it is definitely not required.

David

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