Currently I am working in a PSV sizing case (WETTED WALL) which handles NGL liquid (Natural Gas Liquid)service. This PSV is mounted on a filter separator. The operating conditions of the vessel is as below
1. Operating/Design Temp : 35°C / 50°C
2. Operating/Design Pressure: 70 bara / 101 bara
Using conventional methods in hysys for finding relieving temperature, I am getting an error message in hysys saying "Stream temperaure could not be found at the specified conditions".
I need help in sizing PSV in the above mentioned scenario for finding the RELIEVING TEMPERATURE.
Please also advice whether the relieving temperature shall always be above the design temperature.