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

Floating roof tanks pressure relief

Floating roof tanks pressure relief

Floating roof tanks pressure relief

Dear all!

I have a doubt regarding if a floating roof tank must have a pressure-vacuum valve or it is not necessary. I mean, usually the roof floats on the liquid surface but if there is a very sudden temperature change or, even worse, if the roof gets blocked anyhow, how is the pressure in the tank keep under allowable limits?

Thank you for any help and sorry if the question is too obvious (I am a bit new)

RE: Floating roof tanks pressure relief

To protect the tank there are usually circulation vents for an internal floating roof tank.  You'll never suck one in if it has API 650 Appendix H circulation vents.  The floater has it's own PV vents.

RE: Floating roof tanks pressure relief

I meant external floating roofs and if during a sudden increase of temperature (i.e external fire) there is a possibility for a very quick vaporization of the contents and an increase in internal pressure which could make necessary to install a pressure relief device.

Thank you

RE: Floating roof tanks pressure relief

The floating roof should have adequate pressure relief devices, and it should be heavy enough to remain stable for most conditions.  If however, there is a water bottom that gets hot enough to boil you could have an uncontrollable and dangerous situation.  From just radiant heat of a nearby fire you should be OK.  I expect you would be water cooling the tank anyway.

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


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