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See Chinese contents: GB/T 2550-2016 GB/T 2550-2016: Gas welding equipment -- Rubber hoses for welding, cutting and allied processes
This Standard specifies the requirements for rubber hoses (including twin hose) for welding, cutting and allied processes. This Standard specifies the requirements for medium-sized 2 MPa and light (limited to the maximum working pressure of 1 MPa, nominal diameter less than or equal to 6.3 mm) rubber hoses and acetylene hose (maximum working pressure 0.3 MPa).
