Calculation of the reaction force at the vent pipe outlet
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There is a existing setup consisting of 6 compressors and 6 safety valve vent lines; these 6 lines all lead to a main vent pipe (42\" in diameter) at a vent height of 20 meters. How should the reaction force generated at the end of this main vent pipe be calculated? Are there any relevant standards? Furthermore, considering only a single safety valve that discharges to the main pipe, can it be treated as a closed system?
It cannot be considered in a closed-form manner, although the airflow experiences attenuation in the vent pipe. But I think there is still a significant unbalanced force at the interface between the main pipe and the atmosphere.
For the calculation of the backforce released by safety valves, reference can be made to B31.1, API RP 520, and GB/T20801.3