ASME B16.24-1991 铸铁管道法兰和带法兰管件 Cast Copper Alloy Pipe Flanges and Flanged Fittings Class 150 3004006009001500 and 2500..pdf 未知 JIS B2207-1995 Basis for calculation of aluminium alloy pipe flanges with full face gasket.pdf 未知