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Psv Discharge Piping Height

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#1 usama.iqbal


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Posted 01 January 2019 - 01:42 AM

Hi Fellows,


Hope you all are good.


I need your help Regarding PSV discharge piping height.


A PSV at our plant is installed on Hydrocarbon service (Natural gas) having set point of 125 PSIG and is conventional type.In existing case, this PSV discharge pipe height is 6 ft. i have done it's dispersion analysis on DNV PHAST 7.0 software to check the scenario in case of PSV popping than up to what extent the flammable area will be present but unfortunately this software does not solve vent height for less than 10 m.


Following are some important points for your info:


1. Vent stack is present but discharge of this psv can't be discharge in vent stack  because of excessive back pressure is foreseen in vent stack.

2.The subject PSV is near to small dehydration unit burner around 7 ft away.

#2 breizh


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Posted 01 January 2019 - 03:13 AM

Hi ,

The answer is " to a safe location" , You are the only one who knows the facility with the risks associated in case of release for people and surrounding workshops.


Probably there is a good reason to consider  the height at 10 m minimum.


note : take a look at the ppt and hints about flammable materials


Good luck


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Edited by breizh, 01 January 2019 - 03:46 AM.

#3 usama.iqbal


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Posted 01 January 2019 - 08:14 AM


Thanks for your prompt reply.


Actually in my case, PSV pooping Chances are very remote and the subject PSV is "D" designated which have very low discharge capacity of  ~400 kg/hr.


i want to check that with such low flow either a chance of ignitable mixture condition can prevail or not.


is it any way to check this with any of software.

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