WELD NECK FLANGE ANSI #150 RF Materials :CS & SS& AS Size :DN15-DN1200 ISO9001 ISO14001 ... OHSAS1800 ISO,API,CE,SGS,BV WELD NECK FLANGE ANSI #150 RFSize:From 1/2” – to 48” / DN15-DN1200WT:SCH 20 ... ,metallurgy,constructionSpecial design available as requirement WELD NECK FLANGE ANSI #150 RF