Profile: Stainless Insert Flange Company serves the piping and pressure vessels needs of the food, chemical, petrochemical, and pharmaceutical industries. Insert flanges is used on piping and pressure vessels. The use of insert flanges, made specifically to make jacketed piping assembly easier, also avoids the cost of alternate jacket closure methods such as closure rings, swaging the ends of the jacket pipe and custom machining the backs of standard B16.5 flanges.