How is the discharge volume of the safety valve on the roof of a cryogenic sphere tank calculated?
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Whether it is API521 or China’s HG20570, insulation material must be considered for the safety valves on spherical tank roofs. As a conventional insulation material, polyurethane melts and deforms when heated – so can it actually reduce the discharge volume of safety valves?
The safety valve should be set within the range of safe pressure; it must remain in a closed state, with no discharge allowed. If it exceeds this range, it constitutes illegal operation; the safety valve is designed to come into action only to control overpressure under abnormal conditions. If the phase change of the medium is taken into account, this replacement should be an issue related to the design of the spherical tank itself.