Swivel Ring Flange

Definition - What does Swivel Ring Flange mean?

A swivel ring flange is a two-piece constructed flange used extensively for offshore pipelines and offshore industry applications. It has a heavy forged welding hub fixed to a rotating forged ring that serves as a mating flange to a weld neck or other flange. A swivel ring flange has a retaining ring to secure the welding hub that holds the rotating ring in position.

Swivel ring flanges are also known as swivel flanges.

Corrosionpedia explains Swivel Ring Flange

Swivel ring flanges are well known for solving the issues associated with the alignment of bolt holes during sub-sea flange installation. Swivel ring flanges are available in class 150 to class 2500 specifications and are available up to a 60 inch (152 cm) diameter. These flanges are similar to ASME/ANSI B16.5 and MSS-SP44 flanges and can be readily mated to a standard weld neck flange.

The material used to construct these flanges is either carbon steel or stainless steel having ASTM specs of A105 with a minimum yield of 42,000 psi pressure. An additional thickness is provided at the welding end of swivel flanges in order to compensate for higher yield pipe. These flanges can also be furnished in higher yield materials such as A694 or A707.

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