Hydrogen relief valve calculation
Posted: Fri Nov 09, 2012 4:43 pm
Hello,
I am having problems with a Pressure relief valve calculation due to a non ideal gas (hydrogen)
There is a high pressure vessel (410bar) hydrogen with 3mm ID process pipework leading to a 450bar PRV with 7mm ID orifice to atmosphere
My question is 2 part:
1) For the maximum flow rate of hydrogen out of the PRV @ 450bar should I use 3mm (process pipework) or 7mm (PRV orifice) ID as the tube size for the calulation? Logic says 3mm ID as this is the choking pipework before the PRV so will determin the max flow rate.
2) What woud be the calculated maximum flow rate for the hydrogen gas if the PRV lifted at 450bar and vented to atmosphere?
Thanks for your help in advance!
I am having problems with a Pressure relief valve calculation due to a non ideal gas (hydrogen)
There is a high pressure vessel (410bar) hydrogen with 3mm ID process pipework leading to a 450bar PRV with 7mm ID orifice to atmosphere
My question is 2 part:
1) For the maximum flow rate of hydrogen out of the PRV @ 450bar should I use 3mm (process pipework) or 7mm (PRV orifice) ID as the tube size for the calulation? Logic says 3mm ID as this is the choking pipework before the PRV so will determin the max flow rate.
2) What woud be the calculated maximum flow rate for the hydrogen gas if the PRV lifted at 450bar and vented to atmosphere?
Thanks for your help in advance!