API Flange Dimensions, API Flange Sizes, API Flange Slide Rule, Well Head, Wellhead, BOP Flange, Blowout Preventer Flange, Spec 6A Surface and Spec 17D Subsea Flanges, Sub Sea, 6B, Series Designated Flanges, ANSI, Bolt Circles, Ring Gaskets, Bolts, Studs

ABOUT FLANGES

Look to as "The Source."

Revised: 02/20/2008

On this page you will find API Spec 6A and API Spec 17D Flange information, dimensions, and a method of Flange identification. Included, you will find a chart comparing old API Series Flanges with many ANSI Flanges and current API Flanges. You can easily obtain Flange bolt sizes, bolt torque, and ring gasket numbers.

Provided links give access to illustrations and/or additional information. To return to this page use your browser back button.

FLANGE SLIDE RULE PROGRAM

FLANGES FOR SURFACE AND SUBSEA WELL HEAD AND DRILL THROUGH APPLICATIONS

(Jump down to:

Flange Dimensions, Flange by Diameter, Flange by Circumference,
Flange by Series, Stand-off Between Flanges, Flange Metric Bores, Flange Drift Size)

INDEX

THIS "WEB SITE TOOL" GIVES YOU SIX USEFUL WAYS TO VIEW FLANGE DIMENSIONAL INFORMATION. SCROLL DOWN TO SELECT THE WAY THAT WORKS BEST FOR YOU.

1. IF YOU WANT TO VIEW THE DIMENSIONS ON A SPECIFIC FLANGE, SELECT THIS FLANGE BY SIZE AND PRESSURE DESIGNATION.

IDENTIFIED FLANGES
FOR API 6A FLANGE WELD NECK DIMENSIONS, CLICK HERE. FOR API 6A SEGMENTED FLANGE DIMENSIONS, CLICK HERE. FOR API 17D SS FLANGE WELD NECK DIMENSIONS, CLICK HERE. FOR API 17D SV FLANGE WELD NECK DIMENSIONS, CLICK HERE.	CLICK TO SELECT FLANGE BY SIZE AND PRESSURE RATING.
	*	OBSOLETE, DISCONTINUED OR WITHDRAWN FLANGE
	TO VIEW OR PRINT A FLANGE REFERENCE CHART FOR CURRENT STANDARD FLANGES AS AN ADOBE PDF DOCUMENT, CLICK HERE.

IF YOU NEED THE ADOBE ACROBAT READER, CLICK HERE

2. TO IDENTIFY A FLANGE BY COMPARING THE DIMENSIONS TO A STANDARD, SELECT THE FLANGE BY THE MEASURED OUTSIDE DIAMETER (O.D.) OR THE MEASURED CIRCUMFERENCE (Cir.). THE MEASUREMENTS WILL VARY SOME DUE TO TOLERANCE. BECAUSE DIFFERENT FLANGES MAY HAVE THE SAME MEASURED OUTSIDE DIAMETER OR CIRCUMFERENCE, THIS METHOD MAY REQUIRE THAT YOU COMPARE YOUR FLANGE MEASUREMENTS TO ONE OR MORE "PREVIOUS" OR "NEXT" FLANGES FOR POSITIVE IDENTIFICATION. CLICK HERE TO VIEW A FLANGE IDENTIFICATION WORKSHEET.

UNIDENTIFIED FLANGES
	CLICK TO SELECT FLANGE BY OUTSIDE DIAMETER (O.D.) or CIRCUMFERENCE (Cir.)
	*	OBSOLETE, DISCONTINUED OR WITHDRAWN FLANGE

3. TO VIEW ANY API SPEC 6A FLANGE ORIGINALLY IDENTIFIED BY OLD API SIZE AND SERIES DESIGNATION, AND TO DETERMINE WHICH ANSI FLANGE IT WILL DIRECTLY CONNECT WITH, SELECT IT HERE.

SERIES FLANGES
	CLICK TO SELECT FLANGE BY SIZE AND SERIES.
	TO VIEW THE FULL CHART ON THE INTERNET OR TO PRINT A CROSS REFERENCE CHART OF THESE FLANGES AS AN ADOBE PDF DOCUMENT, CLICK HERE.

IF YOU NEED THE ADOBE ACROBAT READER, CLICK HERE

4. TO VIEW THE STAND-OFF DIMENSIONS BETWEEN MADE-UP FLANGES* THAT SEAL USING R AND RX GASKETS, CLICK HERE.

FLANGES USING BX RING GASKETS DO NOT HAVE NOMINAL STAND-OFF

5. TO VIEW THE INCH AND METRIC FULL BORE DIMENSIONS FOR ANY CURRENT API NOMINAL FLANGE BORE, SELECT IT HERE.

6. TO VIEW THE DRIFT DIAMETERS (INCH/ MM) FOR FULL BORE FLANGED CHRISTMAS TREE AND BLOWOUT PREVENTER EQUIPMENT, CLICK HERE.

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WOODCO USA provides Web Site Tools for identification, estimating, and reference only. Do not use this information for manufacturing or inspection. Users of these tools should not use them as a substitute for professional engineering advice. Anyone making use of the information presented does so at his own risk and assumes any and all liability resulting from such use.

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