Specification: from 1/2" to 80" (DN15 to DN2000) Standard: ANSI B16.5, B16.47, MSS, SP-44, AWWA, API, ... .04)Specification: from 1/2" to 80" (DN15 to DN2000)5)Special designavailable as the requirements of customer6)Standard: ANSI B16.5, B16 ... , JG, BS.7)All the flanges are according to the ASTM, BS, DIN, JIS, EN, GB and customer's request. socket welding ...