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Process Safety Time
#1
Posted 20 November 2022 - 12:36 AM
#2
Posted 20 November 2022 - 01:48 AM
Hi,
Don't duplicate posts! please delete one of them.
What do you mean by "process safety time"?
Breizh
#3
Posted 20 November 2022 - 06:28 AM
There is one control valve upstream of vessel. and PSV(set at 24 barg) installed to the vessel. during failure expected flow is 1945000 kg/hr. Normal condition is 17.7 barg and -97degC. i have calculated volume of vessel and piping inventory. how to calculate process safety time?
Hi,
Is control valve failure leading to happening a dangerous situation or the PSV can handle the case?
Is there any SIF for prevention of the happening a dangerous case?
It's important the SIF response to be faster than the PST....
#4
Posted 20 November 2022 - 04:20 PM
#5
Posted 20 November 2022 - 07:54 PM
#6
Posted 20 November 2022 - 08:01 PM
Edited by sn_sn, 20 November 2022 - 08:02 PM.
#7
Posted 21 November 2022 - 05:04 AM
Hi,
1) You know your initial condition (Pi,Ti), you can calculate the number of moles within this volume,
2) You know your final condition (Pf,Tf), same calculation.
The difference (2-1) divided by the molar flowrate will give you the time you are looking for.
My 2 cents
Breizh
#8
Posted 21 November 2022 - 07:10 AM
i don't have Felder and Rousseau's elemetary principles
Then, use your university text that covered material balances, or another reference, that you do have. Besides, breizh has nailed it for you.
#9
Posted 23 November 2022 - 08:23 PM
Edited by sn_sn, 23 November 2022 - 08:24 PM.
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