Does the starting pressure of the pressure vessel relief valve be equal to the design pressure of the container?
The opening pressure of the relief valve is less than or equal to the design pressure.
The open pressure is set by the use of the environment and cannot exceed the design pressure, but can be lower than or equal to. Design pressure is the inherent attribute of the valve, which can be invalidated or damaged.
The pressure of a relief valve is also called an integral pressure. It is generally equal to 1.05 ~ 1.1 times the pressure of work, and is less than the design pressure of the container. But a special case: when the container needs to be done air-tightness test, test pressure as the design pressure, need to calculate the container of maximum working pressure, setting pressure is greater than design pressure equal to the maximum working pressure. Details: GB150.1 appendix B
Under normal circumstances, according to the working pressure container, determine the relief valve setting pressure (pressure jump), generally take the setting pressure is equal to the working pressure (1.05 ~ 1.1), and then take the design of the container pressure is equal to or slightly greater than the setting. In addition, it is important to note that the pressurized pressure of the relief valve is 90 percent of the total pressure, which is greater than the pressure of work. The relief valve setting pressure deviation should not exceed the larger value of plus or minus 0.015 MPa. In conclusion, the relationship between design pressure, work pressure and the whole set of pressure is to be combined.
