... CERT ,ISO9001 - 2000, WO , PED.7)Standard: ANSI B16.5, B16.47, MSS, SP-44, AWWA, API, DIN, JIS, HG, GB, JG, BS.8)All the ... flanges are according to the ASTM, BS, DIN, JIS, EN, GB ... consist of 30 specifications derived from 7 standards, i.e. ANSI ,API ,MSS ,AWWA , DIN ,JIS ,BS as well as GB ,which size 1/2"(DN15 ...