The retain ring configuration uses heavy wall pipe and has a machined butt end face, along with an annular groove on the outside diameter. After machining, the flange is slipped onto the pipe and a retain ring (which consists of a segmented stainless steel ring bound by a spiral wound stainless steel spring) is sprung over the pipe’s outside diameter nesting in the annular groove.
Bolting the flanges together draws them against the retain rings with the o-ring seal retainer captive within the connection. Pipe sizes 1 1/2" through 10" are available for use with retain ring flanges. The standard connection styles offered conform to SAE and ISO 4-bolt flanges along with Tube-Mac® Industries 8-bolt proprietary flanges. Other flange patterns may also be available.