A beginner’s question about overpressure relief in containers
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With the safe discharge capacity of the container and that of the safety valve, isn’t that sufficient? Why is there also a minimum discharge area for safety valves? What is the relationship here?
To discharge a certain amount, a minimum discharge area is required to ensure such discharge, which in turn allows the container to reach a safe state. Just like a reservoir: if the gate is larger, more water will flow out, and to ensure that the water is released to a safe level within a specified time, there needs to be a minimum size for the gate
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When calculating safety valves, it is necessary to determine the safe discharge volume – the minimum amount that must be discharged from the container to ensure safety – as well as the rated discharge capacity of the safety valve. By comparing these two values, if the latter is greater than or equal to the former, it can be assumed that the safety valve will serve to ensure the safety of the container. The safe discharge area is calculated by means of the former; the area obtained is compared with the actual throat area of the safety valve, and if it exceeds that throat area, it is considered safe. This is the method used in the calculation of safety valves to verify whether the selected model is appropriate.
By comparing the maximum exhaust capacity of the safety valve with the maximum discharge volume required by the container, it is necessary that the maximum exhaust capacity of the safety valve be at least equal to the device’s maximum discharge volume; thereafter, the throat diameter of the safety valve is determined, and the appropriate specifications are identified to finalize the design. This way, a more suitable safety valve can be produced first; if the throat diameter is too small, it is not safe ； If it is too large, it is not economical. In short, it is used for selecting safety valves.
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Reply to floor 4. Is the safe discharge area calculated based on the rated discharge capacity of the safety valve?
Because it is necessary to determine the specifications of the safety valve.
The minimum discharge area is also related to the allowable overpressure during discharge, and it cannot be considered in isolation.