1)Spectacle flange 2)TUV certificate: ISO9001 certificate ,PED and AD2000-W0 certificate 3)ASTM A105 ,RST37.2,S235 ... requirements of customer6)Certificates: the TUV CERT ,ISO9001 - 2000, WO , PED.7)Standard: ANSI B16.5, B16.47, MSS, SP-44 ... /EN10204/3.1B according to AD -Merkblatt WO/TRD100 and PED. We have approved the audit of ISO9001-2000 . We have ...