Design pressure of pipeline »= Design pressure of equipment
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For pressure pipelines connected to equipment that does not have safety valves, the design pressure of the pipeline should be greater than or equal to the design pressure of the equipment. What consequences can arise if this design principle is violated?
As specified in 2.0.5.1 of HG/T20570.1-95, the usual consequence of overpressure in pipes and equipment is an increased risk of leakage at the flange connections or within the pipes and equipment themselves
The pipeline under excessive pressure in the equipment burst directly!
The test pressure for pipes is 1.5 times the design pressure, while for equipment it is 1.25 times. Relatively speaking, pipes have a greater design margin; this is because the upstream equipment acts as a pressure source, and by the time it reaches its design pressure, the pipes downstream should already be under a higher pressure due to pressure losses and static pressure. Therefore, the design pressure for downstream pipes should be greater than or equal to the design pressure of the equipment, and it can be determined as the equipment’s design pressure plus the static pressure at normal liquid levels plus the pressure losses in the pipes.
The strength test is 1.5 times higher; it is also known as a destructive test. It cannot be used as a basis for your theory. It is still safer to keep it above the device’s design pressure.
If the equipment is equipped with a safety valve, what is the relationship between the design pressure of the pipeline and the design pressure of the equipment?
The equipment is equipped with a safety valve, and the design pressure of the pipes is also higher than that of the equipment. When valves are used for isolation, the equipment’s safety valve cannot protect the pipes; it’s not possible to install safety valves on all the pipelines that are isolated Where they intersect, a single safety valve can be shared.
Is this information available in any other books besides the \"Chemical Process Piping Design Manual\"?
Is this information available in any other books besides the \"Chemical Process Piping Design Manual\"?