scope:

1.This specification covets materials and dimensions for cast and forged steel flanges for API line pipe, casing, and tubing intended for. use in drilling and production well control, repress ring, and cycling service.

2. Flange types covered include threaded flanges (line pipe, casing , and tubing), welding-neck flanges (line pipe), and blind flanges. Also covered are integral flange dimensional requirement for valves, fittings, and wellheads (see. St8 6C, 6CM, and 6E).

NOTE: Slip-on flanges are not included in this specification because of limited,' use in drilling and production service. Purchasers may obtain dip-on flanges by reference to ASA B16.5: Steel Pipe Flanges and Flanged Fittings.*

3. This standard also covets ring-joint gaskets and flange bolting, but neither shall be furnished unless the purchase order so states.

4. Nothing contained in this specification is. to be construed. as granting any right, by implication or otherwise, for manufacture, safe, or use in connection with any method, apparatus, or product covered by letters patent, nor as insuring anyone against liability for infringement of letters patent. This specification is for the convenience of purchasers and manufacturers in ordering and producing flanges. It is not intended to inhibit purchasers and producers from purchasing and producing flanges meeting specifications other than those contained herein; nor is it intended in any way to inhibit purchasers from purchasing flanges from companies not authorized to use the API monogram.

*Available from the American Standards Association, Ine.. 10 East 40th Street, New York 16, New York.