Wouldn't the relieving rate be attributed to steam in this case?

The purpose of the PSV would be for potential steam buildup in case of a fire, right?

Andrew H.
www.MotoTribology.com

Don't over think this.

But why are you relieving fire water? NFPA doesn't like this.

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

Agree with littleinch - is just m3/hr but why a PSV on the fire water system?

Mn3/hr is the equivalent flow at standard conditions of 0 Deg C(liquid).

If your fire water is at a different temperation, you can correct it, but likely an extremely minor correction.

Use of relief valve in the pump discharge is concerning, considering the possibilty of valve failure.

Don't mess with fire water systems.

They are not normal, but the work of the devil (aka NFPA). IMHO.

Find something more useful to work on.

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

Quote (LittleInch)

Don't mess with fire water systems.

They are not normal, but the work of the devil (aka NFPA). IMHO.

Couldn't agree more. Every single time I got into design a fire water system, I was riddled with all the nonsense in that "industry".

Daniel
Rio de Janeiro - Brazil

Thanks everyone, if Nm3/hr is flow at standard condition, I think I can use m3/hr instead.

Yes, the units are the same, but you need to correct for temperature and pressure, otherwise, you'll be using the wrong value.

TTFN (ta ta for now)
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Why would you need to correct for temperature and pressure since it is liquid in which case compressibility is negligible? If at all, might expect discrepancies but not much?

If you plan an escape, you must succeed as if you fail, you will be punished for trying. Never say or write down your plan. Heart is the only place where secrecy is granted.

The OP should consult the official relief record and see what the PRD Engineer’s intent was.

Good Luck,
Latexman