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What Are the Components of a Wellhead and What Do They Do? – Part 1
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General Notes for FCI Flange Faces

FCI connections are available with numerous standard and special facings. The more popular standard facings are described below. Special facing details if required are to be furnished by Purchaser.
RAISED FACE:Furnished as a standard facing on all FCI connections unless otherwise specified. The facing height and outside diameter are specified in the standard product tables. Gasket surface serrations are spiral and are in full compliance with the requirements of the latest issue of ASME B16.5, ASME B16.47 Series A & B, and ASME B46.1.
FLAT FACE:All connections may be ordered flat faced. Class 75, 150 and 300 connections and flanges ordered flat faced, will have the normally furnished raised face removed by machining. The resulting minimum flange thickness will be 0.06 inches less than that specified in the standard product tables. On connections and flanges rated Class 400 and greater, the raised face normally furnished will also be removed by machining, however, the resulting flange thickness will not be less than the flange thickness dimension specified in the product table.

Alternately, all connections and flanges may be ordered as “full-flat-face”. When so ordered, Class 75, 150 and 300 connections and flanges will be furnished with a minimum flange thickness as specified in the product table. Class 400, 600, 900, 1500 and 2500 connections and flanges will be furnished with a minimum flange thickness as specified in the product table thickness plus 0.25 inches.

In all cases, the entire connection/flange mating surface will be finished to a surface roughness not exceeding 250 AARH unless otherwise specified by Purchaser.

Options mentioned above are in accordance with ASME B16.5 and ASME B16.47 Code requirements.

ROUGH FORGING:Except as otherwise specified, no finish machining or drilling of holes will be performed on rough forgings. A minimum of 0.12 inches will be provided on all surfaces for Purchaser machining. Facing heights exceeding those of a standard raised face must be indicated.
RING TYPE JOINT:The following table lists the dimensions and tolerances applicable to ring type joint facings for ASME B16.5 flanges. The side walls of the gasket groove are finished to a maximum surface roughness of 63 AARH. Ring joint facings can be furnished for large diameter flanges in accordance with ASME B16.47 upon request.
OTHER STANDARD FACINGS:The dimensional details of other standard facings for ASME B16.5 flanged connections are presented in the table following “Facing Dimensions For Ring Joint Connections”. Other standard facings can be furnished for large diameter flanges in accordance with ASME B16.47 upon request.

NOTE:
Technical data contained in this section governed by ASME or other Codes/Specifications are subject to change and are therefore provided for information purposes only and are not to be used for design purposes. Refer to latest edition of applicable Code/Specification and addendums thereto for required design data.

Contact Us to Learn More About Our Forged Industrial Flange Connections

Contact us at (281) 441-4088 for more information about our standards within the API, ASME, and ANSI flange specifications and our standard and custom facings. Our sales team can answer any questions and provide information you need for your pressure vessel connections.