The rupture disc is located upstream of the safety valve; how should the back pressure of the rupture disc be considered?
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Hello everyone. Regarding the series connection of a burst disc and a safety valve, with the burst disc located upstream of the safety valve, how should the back pressure of the burst disc be considered? Should it be the same as the back pressure of the safety valve, or should it be at atmospheric pressure?
My understanding is a parallel setup. If it is not used for design purposes, it should be calibrated according to the pressure setting specified in the instructions for the safety valve; it must be purchased based on the original specifications of the burst disc, and no modifications should be made to it. Once something is done, it must be based on evidence. The bursting disc has specification markings on it.
Using atmospheric pressure is definitely not correct. When connected in series, the set pressure of the safety valve should be higher than the rated burst pressure; the back pressure is certainly greater than atmospheric pressure
When a burst disc and a safety valve are connected in series, it is necessary to ensure air circulation between them as well as maintain a certain pressure in that space, in order to prevent inaccuracies in the bursting pressure caused by changes in back pressure resulting from temperature variations