GB150 - allowable overpressure? 1

[limbstan]

I am designing a pressure relief valve for a gb150 vessel. I need to know the allowable overpressure for this standard in the fire case. Is it similar to ASME Sec VIII (20%)? I cannot find this information anywhere. I would also need justification for using 20% if this is possible.

 

[deanc]

It is the design pressure.

If you have current GB-150....see Chapter 7,Safety Accessories,Clause 146

Also Annex 5 for design calcs.

Also see

http://www.cbpvi.org/

http://cnscpv.org.cn

 

[limbstan]

OK so what you are saying is for a GB150 vessel exposed to an external fire the allowable overpressure is 0%? As opposed to an ASME code vessel which is 20% above the MAWP for the fire case.

 

[deanc]

Do you have a GB-150 codebook?

Chapt.7 says 0% however Annex 5 gives you a 30% range if it is in a non-fire area with a non-flammable liquid.

Annex 5 also gives you calculations for all others.

So you need the book as there are exceptions
...Always,sometimes,maybe,except. Hmmm,sounds familiar.

 

[limbstan]

No I do not have the code book. I will assume that the allowable overpressure is 0%. The vessel contains a flammable. Thank you for your help.

 

[deanc]

The reason I stress this is that you need a Certificate to ship to China.

Yes,it is expensive and painful. Check the first web site I listed.

If you do not,the Chinese will hold it on the dock. It can get extremely expensive.

If you are a HSBCT Customer...check the web site.