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.