Vent header sizing

[Buchi]

Hi all,

I am trying to perform a capacity check on an existing vent header. My largest venting load has been determined. Is there some sizing criteria that one can apply to ensure a suitable vent header size. I know that relief header considers the mach number and the rhov2 criteria in ensuring that it is not undersized. what are the criteria that applies to vent header?

cheers.

Buchi

 

[GregLamberson]

Buchi

Apart from volume (which you have), time of fill for the tank/vessel will be needed to determine outflow. From there you can size the header.

Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website:

http://www.oil-gas-consulting.com

 

[mkannans]

Buchi,
For the Relief main headers, generally it is recommended to limit mach no to 0.5 for new plants. for revamp in some projects people go upto 0.7.
For Tail pipes of PSV discharge, we can go upto 0.9.

 

[Latexman]

Buchi,

I have a doubt. Because of lack of detail and nomenclature confusion, I doubt the responders are answering properly. I know I am confused by your post and the responses.

In my experience, a header usually has a single source and multiple outlets (i.e. steam header) or multiple sources and a single outlet (i.e. vacuum header).

A tailpipe on a relief or vent unit usually has one inlet source and one outlet.

When I read your post, I am not 100% sure I know exactly what you have. Can you clarify?


Good luck,
Latexman