Spherical tank pressure test
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Does anyone have the pressure testing procedures for spherical tanks that I can refer to? Is it necessary to connect all the valves before testing a spherical tank? Are safety valves subjected to hydrostatic testing and pneumatic testing? Are there any special treatments for the valves outside the spherical tank body? I also consulted relevant standards, such as GB 150.4-2011 Pressure Vessels – Part 4: Rules for Manufacturing, Inspection and Testing; these standards do not specify which parts need to undergo hydrostatic testing and which ones need to undergo pneumatic testing. The spherical tank is equipped with gas-liquid equilibrium pipes, manholes (with drainage outlets), various instrument connections, inlet and outlet ports. The safety valve, discharge port, and relief port are all connected to a single flange. So which parts need to undergo hydrostatic testing, and which ones need to undergo pneumatic testing? Are there any pressure test reports that can be used as a reference? ? The spherical tank has a volume of 2000 m3, with a test pressure of 2.15 Mpa
According to clause 4.8.3(3) of the Fixed Pressure Vessels Regulations, during the airtightness test, safety accessories should generally be installed in their entirety. Therefore, during the airtightness test of spherical tanks, safety accessories such as safety valves must be installed.
The hydrostatic test is a type of strength test; therefore, all pressure-bearing parts of the spherical tank body (in accordance with GB150) must be included in the scope of this strength test. All components and interfaces connected to the body interface are included in the airtightness test. (What you call a “pressure test” is actually a “air-tightness test”, also known as a “leakage test”)