Pressure setting of the safety valve
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This post was last edited by Sammy_Wang on 2016-10-10 at 16:00. The distillation tower operates at a negative pressure of 10 KPa (absolute pressure), and a safety valve is installed at the top of the tower; the opening pressure of this safety valve is also at negative pressure. However, the backpressure at the flare is 170 KPa (absolute pressure). How is the gas phase discharged to the flare after the safety valve activates?
That’s a mistake. The opening pressure of safety valves is always positive pressure. The opening pressure of the safety valve is negative pressure, making it impossible to calibrate.
It seems I misunderstood. If the operating pressure of the tower is negative, and the design pressure is 0.1 MPa (gauge pressure), then how should the opening pressure of the safety valve be determined?
It seems I misunderstood. If the operating pressure of the tower is negative, and the design pressure is 0.1 MPa (gauge pressure), then how should the opening pressure of the safety valve be determined?
The opening pressure of the safety valve is 0.1 MPa (gauge pressure)
The flare backpressure is 170 KPa (gauge pressure); in this case, can the safety valve discharge to the flare?
Then the design pressure of your tower should be at least 0.5 Mpa. You’re wrong.
Thank you so much; I really couldn’t find any basis for the design. The operating pressure of the tower is 10 KPA (absolute pressure), and the backpressure at the flare is 170 KPA. Why is the design pressure of the tower so high? Is the set pressure of the safety valve equal to the design pressure of the tower?
Thank you so much; I really couldn’t find any basis for the design. The operating pressure of the tower is 10 KPA (absolute pressure), and the backpressure at the flare is 170 KPA. Why is the design pressure of the tower so high? Is the set pressure of the safety valve equal to the design pressure of the tower?
The pressure in the torch pipeline network is generally 3 KPA