VALVE MACH NO FOR OUTLET PRESSEURE -14.7 PSIG
VALVE MACH NO FOR OUTLET PRESSEURE -14.7 PSIG
(OP)
I have problem with a valve. I have service that outlet pressure should be -14.7 psig.Inlet pressure is 84.8 and pressure drop is 99.49 and line size is 0.75" and i can changed it to 1". media is nitrogen ( gas). Flow rate is 25 lb/h.
I run the sizing program. The program result say me the MACH # is 1 and sonic diameter 6.114 and also software say me you should chose larger line size but i can not.
please advised me what shall i do for this application?
I run the sizing program. The program result say me the MACH # is 1 and sonic diameter 6.114 and also software say me you should chose larger line size but i can not.
please advised me what shall i do for this application?





RE: VALVE MACH NO FOR OUTLET PRESSEURE -14.7 PSIG
suggest you to call your process engineer, to make the line larger, for process design, the gas velocity in the pipe should be lower than 50m/s in design, and 6-9m/s for liquid......
if you have to use 0.75" line, go check the pressure drop on the pipe line and on the control valve, i pretty sure the pressure drop should be lower than what you have got from your process guy---99.49 psi-d???
Get help and return with helps!!.
RE: VALVE MACH NO FOR OUTLET PRESSEURE -14.7 PSIG
You know outlet pressure should be -14.69 psig and in this case inlet pressure is 84.8 psi, my line size is 3/4". So, I would like to control flow woth flow control valve and Flow rate is ( min = 25 ib/hr) and max= 100 lb/hr.
in this case I try to select a valve that it can be keep pressure at - 14.69 psig.
As you see we have to rach to Outlet pressure = -14.7 psig.
RE: VALVE MACH NO FOR OUTLET PRESSEURE -14.7 PSIG
Get help and return with helps!!.
RE: VALVE MACH NO FOR OUTLET PRESSEURE -14.7 PSIG
Get help and return with helps!!.