3 replies to this topic

[sheiko]

Is it a good practice to locate a PSV on pipe on a rack? Have you ever seen that? and if yes, in which case?
Thanks

Edited by sheiko, 18 January 2011 - 03:48 PM.

[fallah]

Is it a good practice to locate a PSV on pipe on a rack? Have you ever seen that? and if yes, in which case?
Thanks

PSV can be installed on pipe on a rack or sleeper to protect the line or downstream header/equipment, mostly,against blocked outlet scenario (i have seen on pipe on sleeper for protection of downstream header).

obviously,the following items should be cosidered for mentioned installation:

-Loads of PSV
-Impact of PSV reaction force on design of relevant structure
-Access facility (platform,...) for maintenance
-.....

[Erwin APRIANDI]

Dear sheiko,

I don't know whether it is agood practice or not, but I've seens lots of this application during my time as an Oil and Gas facilities inspector.
Most af the application is for block discharge scenario, but I have also seen it for fire case first one that I see is to protect a double pipe heat exchanger and the second one is for the protection of printed circuit heat exchanger both in Dew Point Control System unit.

And additional note from my inspection results and from their HAZOP close out is that, they have also considered the hydraulics from the protected equipment to the PSV and also the integrity of the line and also pipe rack integrity so that the PSV can do what it is required to do in case of emergency.

[James.bruce]

There are sometimes i'm aware off that may warrent this.

You need to consider the following.

1. Why the relief valve is installed (e.g what cases do you expect it to operate under)..? e..g. for a highy toxic fluid on a regular operational case - no would be the answer. but for a safe fluid .e.g. air - with noise and discharge location considered.. yes.. and variying degrees between..
2. Fluid condition. gas/vapour/liquid/ solid/slurry
3. Size of valve.. eg will it relase 100 te/hr of vapour or 0.1 kg/hr etc..
4. temperature pressure etc..

Examples i've seen are.. steam header entering a site. To limit the pressure of your site main. relief valve lifts vertically upward.