Is it required to calculate inlet and outlet pressure drops when sizing a rupture disc using the "Coefficient of Discharge Method"? To me this seems unnecessary as pressure drop is required for PSVs since larger pressure drops have adverse effect on the relieving of the PSV. The pressure drop should be limited by the short distances required to follow the "8 and 5" rule. Thanks.
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Pressure Drop Calculations Required For "coefficient Of Discharge
#1
Posted 24 June 2015 - 12:35 PM
#2
Posted 24 June 2015 - 02:32 PM
I don't understand what you are referring to. I always sized the rupture disk and piping associated with a rupture disk using the K, or resistance, value for the rupture disk.
Bobby
#3
Posted 24 June 2015 - 07:21 PM
ryn376 ,
Consider reading the document attached to clear your doubts.
http://www.cheresour...ngineers-part-2
Breizh
Edited by breizh, 02 July 2015 - 12:31 AM.
#4
Posted 24 June 2015 - 08:56 PM
When a rupture disk bursts, there's no inlet or outlet, just total length of pipe with a ruptured disk (kr) in it.
#5
Posted 30 June 2015 - 01:29 PM
The disc type requested by my client does not have a Kr value, therefore I cannot size it per the standard resistance coefficient method.
#6
Posted 30 June 2015 - 09:31 PM
ryn376 ,
Why don't you ask the vendor ? Should not be a problem .
my 2 cents
Breizh
Edited by breizh, 30 June 2015 - 10:28 PM.
#7
Posted 01 July 2015 - 06:11 AM
How does the vendor characterize the frictional losses of your rupture disk? If it's not in the documentation for your rupture disk, do as Breizh recommends, ask the vendor.
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