Pressure Drop Across An ESDV
Pressure Drop Across An ESDV
(OP)
Hi all,
I am back with one more question (a simple one for those with experience) and will appreciate any help.
I am doing a sizing exercise for a gas plant and need to size some shutdown valves for a client. What pressure drop will be used in the CV calculations? Is it the operating pressure upstream of the valve? Since the plant/process is shut down when the valve is activated, logic tells me that the pressure on the downstream side should be zero. So, if our pipeline operating pressure is 800 psig, the pressure drop across the valve should be 800 - 0 = 800. Am I right?
If I am wrong, what is the rule of thumb? How do I calculate the pressure drop across the valve since only the pipeline pressure is know?
What about for liquid lines? Does the same logic hold?
I am back with one more question (a simple one for those with experience) and will appreciate any help.
I am doing a sizing exercise for a gas plant and need to size some shutdown valves for a client. What pressure drop will be used in the CV calculations? Is it the operating pressure upstream of the valve? Since the plant/process is shut down when the valve is activated, logic tells me that the pressure on the downstream side should be zero. So, if our pipeline operating pressure is 800 psig, the pressure drop across the valve should be 800 - 0 = 800. Am I right?
If I am wrong, what is the rule of thumb? How do I calculate the pressure drop across the valve since only the pipeline pressure is know?
What about for liquid lines? Does the same logic hold?





RE: Pressure Drop Across An ESDV
--Mike--
RE: Pressure Drop Across An ESDV
Same thing for liquid lines.
Valve CV is only of use if you have flow. If you have flow past your ESD valves then you're in big trouble, but please let me know if I'v emisunderstood your question / issue.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way