Nm3/hr

• Sep 3, 2020

• #2

SuperSalad

Chemical

Mar 8, 2017

773

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.

http://www.MotoTribology.com

 

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• Sep 3, 2020

• #3

LittleInch

Petroleum

Mar 27, 2013

21,546

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.

 

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• Sep 3, 2020

• #4

MortenA

Petroleum

Aug 20, 2001

2,996

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

 

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• Sep 3, 2020

• #5

hacksaw

Mechanical

Dec 7, 2002

2,564

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.

 

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• Sep 3, 2020

• #6

LittleInch

Petroleum

Mar 27, 2013

21,546

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.

 

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• Sep 3, 2020

• #7

danschwind

Mechanical

Sep 12, 2018

191

LittleInch said:

Don't mess with fire water systems.

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

Click to expand...

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

 

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• Sep 4, 2020

• Thread starter
• #8

akatami

Mechanical

Sep 3, 2020

2

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

 

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• Sep 4, 2020

• #9

IRstuff

Aerospace

Jun 3, 2002

44,447

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

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• Sep 5, 2020

• #10

rotw

Mechanical

May 25, 2013

1,143

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?

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• Sep 5, 2020

• #11

Latexman

Chemical

Sep 24, 2003

6,929

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

Good Luck,
Latexman

 

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