raised face long weld neck flange 1.Resistance to corrosion. 2.Acid and alkali resistant 3 ... .High temperature resistant raised face long weld neck flange Welding Neck Flanges, Slip on Flanges, Threaded Flanges, Socket ... , electric power plant, pipe fittings, industrial, pressure vessel etc11.Connection: flange nuts, bolts connection12.Product features: resistance to corrosion. Acid and ...