how to check psv outlet temperature in hysys?
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#1
Posted 21 April 2017 - 03:07 PM
#2
Posted 21 April 2017 - 03:59 PM
Check with what?
Bobby
#3
Posted 21 April 2017 - 06:59 PM
I supose that you mean "how to estimate" the temperature in Hysis
Basically you can simulate an adiabatic expansion.
If the velocity is high, it may be more accurate to add an adiabatic section of pipe model to let Hysis take care of the velocity component.
If you just add the adeiabatic expansion, the result will be the stagnation temperature, that will differ from the flowing emperature by the term (v^2/2)/cp.
At 10 m/s you can ignore the effect since is less than on tenth of a degree, but for Mach 0,6 it is in the order of 20 °C for air.
#4
Posted 22 April 2017 - 12:49 AM
there are several threads discussing this topic, see for example
https://www.cheresou...ng-temperature/
depending from the software available you can adopt equivalent procedures,
you can also compare results from different methods and average values,
(in some cases I average values from constant energy flash and isentropic flash in Prode)
#5
Posted 03 May 2017 - 01:28 AM
I have done for my past project as below:
1) Flare Header Pressure (operating) 50 psig for HP Flare to which PSV outlet was connected.
2) I have done Hydraulic cal for outlet line size of PSV considering Approx. at 50 psig Pressure & Corresponding Temp. (estimated from hysis).
3) I have done Hydraulic cal for outlet line size of PSV considering Approx. at 20 psig Pressure & Corresponding Temp. (estimated from hysis).
4) From above 1 & 2, Checked which cal./ PSV Outlet Line size is more reliable & relevant to meet backpressure requirement for PSV.
5) From this I made a conclusion for outlet pressure between 50 to 20pisg & again found in hysis corresponding temp to find out outlet properties & final cal for PSV Outlet Line size.
#6
Posted 03 May 2017 - 01:31 AM
Sorry, I did not mention from where I found 20 psig. This is based upon pressure drop result from cal ( Refer my Point -2).
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