Retain Ring Flange
Retain Ring Flange is used for heavy wall pipe and has a machined butt end face, along with an annular groove on the outside diameter. It is normally used for very high pressures and larger pipe sizes.

After machining, the flange is slipped onto the pipe and a retain ring (consisting 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.

The flanges can be rotated prior to bolting thus eliminating the need to be concerned about the axis of the pipe on which the fitter aligns the flange holes. At times, it also allows the flange cap screws to be installed in more confined spaces.

Retain Ring Flange system is used for pipe sizes ranging from 1-1/2” through 10” are available for use with pressures up to 6000 psi. This system is used for pipes of the above sizes with wall thickness greater than 6 mm. The standard connection styles offered conform to SAE (ISO 6162 -1, 2) and ISO 6164 4-bolt flanges along with TMI® 8-bolt proprietary flanges. Other flange patterns may also be available. TMI has in-house developed portable Grooving machine to meet the required standard of grooving needed for retain ring flange system. Grooving machine operator needs basic training to operate the equipment which will be provided.
Step-by-step guide on how to install a Retain Ring Flange connection:
Step 1
Pipe supplied with butt end machined along with an annular groove on the outside diameter using a grooving machine.
Step 2
Slip flange onto the pipe.
Step 3
Retain ring is sprung over the pipe’s outside diameter nesting in the annular groove.
Step 4
Select the correct 'o' ring seal retainer style (click here to refer catalogue) .The 'o' ring provides a seal against the butt end of the pipe.
Step 5
Select the required bolting hardware from Section R of this catalogue (click here to refer the catalogue). Carefully place the ‘o’ ring seal retainer in between the pipe ends. Slide the flanges forward and the ‘o’ ring seal retainer becomes captive within the flanges.
Step 6
Tighten bolts to the torque values specified. Always tighten bolts in a cross-over sequence and ensure that the flanges are parallel.
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