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The Fixed Capacity Regulations stipulate that non-ferrous metals used for pressure vessels (aluminum, titanium, copper, nickel, and their alloys, etc.) must meet the following requirements. ① Non-ferrous metals used in the manufacture of pressure vessels must meet the technical requirements specified in the standards referenced in these regulations; if there are any special requirements, they must be indicated in the design drawings or corresponding technical documents. ② Pressure vessel manufacturers shall establish strict storage procedures and designate specific areas for storing such metals, separating them from carbon steel and low-alloy steel. When aluminum and aluminum alloys are used for the pressure-bearing components of pressure vessels, they must meet the following requirements: ① The design pressure shall not exceed 16 MPa; ② For aluminum alloys with a magnesium content of 3% or more (such as 5083 and 5086), the design temperature range is -269 to 65°C, while for other grades of aluminum and aluminum alloys, the design temperature range is -269 to 200°C. When pure copper and brass are used for the pressure-bearing components of pressure vessels, their design temperature should not exceed 200°C. When titanium and titanium alloys are used for the pressure-bearing components of pressure vessels, they must meet the following requirements: ① The design temperature for titanium and titanium alloys shall not exceed 315°C, while the design temperature for titanium-steel composite sheets shall not exceed 350°C; ② Titanium and titanium alloys used to manufacture the shells of pressure vessels shall be used in their annealed state. When nickel and nickel alloys are used for the pressure-bearing components of pressure vessels, they should be used in the annealed or solution-treated state. When tantalum, zirconium, niobium, and their alloys are used for pressure-bearing components in pressure vessels, they should be used in the annealed state. The design temperature for tantalum and its alloys is not higher than 250°C, for zirconium and its alloys it is not higher than 375°C, and for niobium and its alloys it is not higher than 220°C.