This specification covers materials and dimensions for cast and forged@ carbon-steel and alloy-steel ring-joint flanges intended for use in accordance with the service pressure ratings given in Sect. III. These flanges are intended for use in water@ oil@ or gas service@ and are suitable for use with valves covered by API Std 6C and 6D@ and with wellhead fittings covered by API Std GE. Series 2900@ 10@000-lb. flanges covered by Table 10 are the proper flanges for use with 10@OOO-lb. valves for well control service@ as given in API Std GC. Because of threading and other dimensional requirements@ casing and tubing flanges are peculiar to oil-field service. The types of flanges covered include threaded flanges (line pipe@ casing and tubing)@ slip-on welding flanges (line pipe and casing)@ welding-neck flanges (line pipe)@ blind flanges@ and also integral flanges (facing dimensions only) for valves and fittings. This standard also covers ring-joint gaskets and flange bolting@ but neither is to be furnished unless the purchase order so states. Nothing contained in this specification is to be construed as granting any right@ by implication or otherwise@ for manufacture@ sale@ 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.