1 reply to this topic

[Antonieta]

Dear All,

I have used Hysys dynamics for depressurisation with an isentropic expansion efficiency of 90% and a vessel U value of 5W/m2K. The minimum fluid temperatures calculated dowstream of the valve are around -80C. I've been told these are the temperatures that can be achieved during this type of process which involves isentropic expansion + isenthalpic expansion.

I've been told that usually mean metal temperature is substantially less severe than the fluid temperature and that the flare piping design should be based on the mean metal temperature, not on the temperature of the fluid contacting the metal.

Please could you advice how to calculate the mean metal temperature?

Thanks in advance,
Ann

[JoeWong]

Dear All,

I have used Hysys dynamics for depressurisation with an isentropic expansion efficiency of 90% and a vessel U value of 5W/m2K. The minimum fluid temperatures calculated dowstream of the valve are around -80C. I've been told these are the temperatures that can be achieved during this type of process which involves isentropic expansion + isenthalpic expansion.

I've been told that usually mean metal temperature is substantially less severe than the fluid temperature and that the flare piping design should be based on the mean metal temperature, not on the temperature of the fluid contacting the metal.

Please could you advice how to calculate the mean metal temperature?

Thanks in advance,
Ann

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JoeWong