×
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

Tank Spec for DBBL Valves

Tank Spec for DBBL Valves

Tank Spec for DBBL Valves

(OP)
This question has been asked before but the answer wasn't exactly what I was looking for.

What specs (Api etc..) dictate the operation of double block and bleed valves in a mutli product tank storage/ manifold?

The previous answer was API 6D but I beleive that is the valve spec. I would like to know the tank storage spec if there is one.

Thanks

RE: Tank Spec for DBBL Valves

There is no standard or code mandating the use of DB&B valves in any particular service, apart of safety application in the ASME I, to prevent the steam pressure reaching the isolated boiler during the maintenance work.
I have seen many specifications requesting the use of these valves, as prove of positive isolation of two incompatible systems (between tanks, between the pressurised equipment and associated instruments-pressure, temperature, etc, including the bleed on the ambient side). I have seen large DB&B valve between the potable water line and the fire water system;- however, I only have seen some local authority regulations for the use of such valves to protect the potable water system from contamination due to return of fire water into the potable water system. The applications are many and mostly client spec driven.
Hope this helps,
cheers,
gr2vessels

RE: Tank Spec for DBBL Valves

Double block valves are mentioned in API RP 1595  for aviation airfield storage, Publication 346 for underground pipe leak detection, API RP 2023 for heated petroleum, API Soec 11N for LACT unit custody transfer, STD 2015 for sefe entry of storage tanks, STD 2610 for terminal and tank facilities, ...

RE: Tank Spec for DBBL Valves

Looking at my typing, clearly I was asleep when I sent that message.  We need spell check here.  winky smile

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