The Swivel-Ring Flange permits 360° rotation of an outer ring around a hub, to allow easy alignment of bolt holes when attaching to a mating standard flange. For subsea applications, this capability is important when only a single diver is available to align and make up the flange connection.
Swivel-Ring Flanges can be designed for any size and pressure rating to meet applicable dimensions and gasket types of any recognized flange specification, such as ASME B16.5, API 6A or MSS SP-44. Non standard Swivel-Ring Flanges can also be custom-designed for certain applications; for example, applications involving large pipelines may incorporate features such as hub face profiles to aid axial alignment and Teflon rings between the SRF ring and hub to reduce rotational friction.
Swivel-Ring Flanges are available from stock in diameters from 4-inches through 24-inches, in both 600 and 900 ANSI ratings. Up through 16-inch, SRFs are stocked with schedule 80 bores; 20-inch and 24-inch have schedule 60 bores. The material for inventory SRF hubs is ASTM A694, grade F52. For reference, dimensional data for most ANSI and MSS RTJ Swivel-Ring Flanges are given in the tables on the back of this sheet.
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Swivel-Ring Flange
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Butt weld by butt weld
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Swivel-Ring Flanges meet the requirements of API 6H and are designed in accordance with ASME Pressure Vessel Code, Section VIII, Division 2, unless otherwise specified, and applicable sections of the flange specification to which it will mate.
Please provide the following information on any purchase order or request for quotation:
• Nominal pipe size
• Pipe wall thickness or bore
• Pipe grade
• Design rating
• Specification of mating flange
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Oil States Industries, Inc.
Oil States International, Inc.