Whether it is vapor pressure regulations or volume regulations, it is stated that the set pressure of the safety valve on low-temperature tank trucks is lower than the design pressure of the tanks, but there is nothing lower than...

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Whether it is the steam regulations, the pressure vessel regulations, or the regulations for mobile pressure vessels, all state that the opening pressure of the safety valves on low-temperature tank trucks is lower than the design pressure of these tanks. What is the actual coefficient? ? It is not clearly specified either. According to the regulations for inspecting mobile pressure vessels, such as liquid ammonia tank trucks, the design pressure for these vehicles is set at 2.16 Mpa; meanwhile, the regulations related to steam systems specify that the pressure should be ≥1.91 MpaG. In practice, the design pressure of such vehicles is usually 1.91 MPa. The information on safety valves indicates that the maximum opening pressure is 1.6 MpaG, but there are no clear regulations regarding the ratio between the opening pressure of safety valves on low-temperature tank trucks and the design pressure of those trucks. Are there any manufacturers of safety valves for tank trucks in this group? I’d like to discuss this ratio