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You may be looking at a multiple failure if your scenario does not cause both outlets to be blocked. Do check your system as suggested above. You only have to consider the worst case scenario if only one outlet is blocked per scenario. Find which one gives the largest required orifice size...

Well said Art. Thermal relief is cheap, does not require strict documentation, except for highy volitale fluids, and makes good practical sense for process safety management. Don't leave the plant without it.

DIERS which is the Design Institute of Emergengy Relief Systems is the research think tank for relief system design methodology especially for two-phase venting. DIERS is the premire source for designing pressure relief systems for reactive, non-reactive, homogeneous onset disengagement, bubbly...

DIERS which is the Design Institute of Emergengy Relief Systems is the research think tank for relief system design methodology especially for two-phase venting. DIERS is the premire source for designing pressure relief systems for reactive, non-reactive, homogeneous onset disengagement, bubbly...

Boy you got a tough one. This is another job for DIERS(Design Institute of Emergency Relief Systems) methodology. Go to www.diers.net and select software from the navigation bar. Choose the Free Mach II Reader and Regression Tool and download the DIERS safety valve and pipe benchmarks. You...

This is still a grey area in chemical engineering especially for relief system design and inlet/outlet pressure drop calculations. Go to www.diers.net and choose software. Download the Free Mach II Reader and Regression Tool and also both the Safety Valve and Pipe benchmarks. You can look at...

Hello Airbus, You can also go to www.diers.net and choose software on the navigation bar. Choose the Free Mach II Reader and Regression Tool to learn relief system design and documentaion to meet OSHA 1910.119. The Reader allows you to view, print, export, and analyze over 200 DIERS...

You can also go to www.diers.net and choose software in the navigation bar. You can download the Mach II Reader and Regression Tool for free to get an example of OSHA 1910.119 PSM documentation requirments for relief valve design and design base calculations. You will also find over 200...

grt12 is corrct. The pressure at P3 can not be less than the atmosphric pressure what ever the atmosphric pressure is be it above or below sea level. If the pressure inside the pipe is less then atmosphric than you will have a vacuum and the flow will be slightly reversed inside the pipe...

This is a very good question. The coupling equation couples the vessel flow with the nozzle based on the flow regime model selected. You must know the orifice size of the relief valve and the cross area of the vessel. If you do not know this then you must first do a design mode calcualtion...