We have made these stainless steel (grade 316) trunnion tubes many times for a local pharmaceutical manufacturer. They are made from 3″ OD heavy wall stainless steel tube and we weld on the bearing housings, the tube branch and associated flanges and sockets. The welding is carried out to a predetermined procedure to prevent heat distortion over the length.
The welded tube is then set up and finally machined between centres to suit the bearing surfaces at either end of the tube. Finally pickled and cleaned before despatch. Typical of the fabrication and machining service we provide.