Safety valve outlet pipe
Thread Content
Could someone expert please help answer this: Is it necessary to calculate the size of the safety valve’s outlet pipe based on the Mach number? It seems that in many cases this isn’t done; instead, the outlet pipe is simply chosen to be one or two sizes larger than the inlet pipe.
The diameter of both inlet and outlet pipes needs to be calculated； Generally, for ordinary safety valves, the outlet pressure drop is 10% of the set pressure, while the inlet pressure drop is 3% of the set pressure.
The diameter of the safety valve outlet pipe needs to be calculated; the safety valve is designed based on the specified back pressure for venting or flaring, and the diameter of the outlet pipe is determined under those back pressure conditions. You can just use PROII or Aspen to do it.
It is still necessary to calculate the pressure drop in the outlet pipe of the safety valve; otherwise, problems may arise. The spreadsheet I prepared is for trial use: https://bbs.hcbbs.com/thread-2953230-1-1.html