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[Ali4269278331]

Dear guys

for a line(8in) we have 10bar in the inlet/outlet of SDV. the SDV is fullbore, ball valve, 300# flanged. if assume pressure drop is 1.98 bar. now the SDV working with 2bar of instrument air on the actuator. if inlet pressure increase up to 15bar, how much air supply(in bar) for open/close the SDV?

the process fluid is crude oil(24API) and 290m3/day. So, in the designing of SDV the main parameters are: Max. inlet/outlet pressure, volume of Actuator and air releasing time from actuator(like in partial stroke test)

[Chemitofreak]

You have to provide a proper datasheet to the vendor with process conditions and the instrument air conditions.

 

The fundamental they simply use Pressure = Force Acting / Area.

 

So, it is not only the pressure of the instrument air that is important, but on how much area is it acting on. The vendor will design the actuator accordingly.

 

Regards