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!

*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.

Jobs

check valve (FSV) as safety device in API 14C

check valve (FSV) as safety device in API 14C

(OP)
Hello.
I am looking into safe design of an offshore heating medium system using combustible heat transfer medium heated in a power generation turbine exhaust duct.
API 14C recommends a single FSV in the heating medium line downstream the Exhaust-Heated Component, to prevent backflow of combustible fluid into the exhaust heater chamber in the event of tube rupture.
In my experience as a process designer in the North Sea, a single FSV is considered to limit backflow only in an operational context. In the safety context I have specified two dissimilar FSVs in series as primary overpressure protection with a PSV as secondary protection. In this case I have further assumed that when a demand is placed on the FSVs, they will leak at a rate corresponding to 10% of the cross sectional area of the pipe in which they are installed.
In my experience as a process support engineer I have never come across a performance standard for regular verification of FSVs, such as would be applied to ESD valves in hydrocarbon service.
So now I am inclined to specify an ESD valve in the heating medium line instead of FSVs, since backflow of heating medium would risk escalation of a fire event in the exhaust heater chamber.
Any comments please folks?

RE: check valve (FSV) as safety device in API 14C

Sounds like a good plan to me. I assume you would need one anyway on the inlet side of the tube bundle so another one on the exit is not a big deal IMHO. what size pipe are we talking here and would you add a FSV as well as the ESD or only the ESD valve? I'm thinking about closure speed and activation time for the ESD system to detect a tube rupture and close the valve(s).

I didn't follow the issue about two dissimilar FSVs unless you were talking about a different case.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: check valve (FSV) as safety device in API 14C

You've probably answered your concern yourself : 2 dissimilar FSVs' are preferred when there is a risk of overpressure (and loss of containment) due to reverse flow.

In this case, the loss of containment has already occured with the tube rupture, so you're not really minimising the risk of an overpressure here - all we want to do is to minimise the severity of the potential fire in the waste heat recovery unit.

Adding an SDV on the exit (in addition to the one that would be somewhere on the inlet line) further reduces the severity of the potential fire in the WHRU, but this would be viewed as a supplementary risk reduction device, while the check valve would be the primary.

RE: check valve (FSV) as safety device in API 14C

Hi

I want to design a heat recovery system from Exhaust gas of gas turbine ,to heat up oil of hot oil system. can anyone give tips to how size the heat exchanger to be used.
Many thanks in advance for any help.

RE: check valve (FSV) as safety device in API 14C

Please don't hijack other people's threads. Just start your own one and provide as many details as you can.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

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


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