Analysis of Abnormal Conditions in Chemical Plant Sites
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A pressure relief device is installed on the reactor; rupture discs are used in series ahead of the safety valve. In this incident, the pressure monitoring system indicated that the pressure was within normal operating limits, yet the rupture discs ruptured and the safety valve also activated. The pressure settings for the rupture discs and the safety valve are essentially the same. The current analysis of the reasons points to possible faults or incorrect settings in the pressure monitoring system. Additionally, if the rupture disc bursts prematurely, it might cause the safety valve to activate before the required operating pressure is reached; the ratio between the operating pressure and that of the rupture disc is around 0.8, for a reverse-arch type rupture disc. I would like to ask the experts whether the above statement is correct; it’s just my personal opinion!
It’s the issue with the pressure measurement point... if everything else is fine
I agree with this; it depends on whether the pressure measurement point is in the right location
There is a delay in taking pressure readings by the pressure monitoring system. Assuming that the setting of the burst disc and its quality are satisfactory, it is necessary to analyze whether it is possible for the reaction vessel to experience sudden overpressure during operation.
There must be a problem with the pressure monitoring system...
You need to trust the burst discs and safety valves; the instruments have errors
Adjust the watch; I think it’s more reliable that way
First: If the burst disc ruptures and the safety valve activates, it indicates that the pressure has definitely reached the corresponding level; it could be due to an instantaneous overpressure. Second: When the burst disc and safety valve are used in series, the design pressure of the burst disc is usually set at a level that is 10% above the pressure at which the safety valve activates. As for what you mentioned – if the burst disc ruptures prematurely, could that cause the safety valve to activate before the required pressure is reached? That’s not possible, unless there is something wrong with the safety valve. Your analysis seems reasonable. I work in the sales of burst discs; if you have any questions, feel free to leave a message. These are just my personal opinions; thank you for considering them.