... DIN 2573 3.ISO9001, SGS, BV 150# Weld Neck flange 1. Specification Type150# Weld Neck flangePipe Size1/2"—72" Pressure150# ,300 ... gas industry,drilling,chemical industry,electric industry,shipbuilding,fertilizer equipment and pipeline,structure,petrochemical,pharmaceutical industrySurface Transparent anti rust ... .2.Product3.Production4.Marking5.Packing & Transportation6. Company 150# Weld Neck flange