Standard Specification for FLANGES, FORGED, CARBON AND ALLOY STEEL FOR LOW-TEMPERATURE SERVICE
|Publication Date:||30 July 1976|
|ICS Code (Flanges, couplings and joints):||23.040.60|
This specification covers forged carbon and alloy steel flanges intended primarily for petroleum and gas pipelines in areas subject to low ambient temperatures. Included arc flanges to specified dimensions or to dimensional standards such as those MSS, ANSI, and API specifications that are referenced in Section 2.
Supplementary requirements are provided for use when additional requirements are desired. These shall apply only when specified individually by the purchaser in the order.
Eight grades, four yield strength classes, and three different notch toughness levels are included.
The availability of a particular size of flange of a specific grade and class is limited only by the capability of the composition to meet the specified mechanical property requirements. However, current practice normally limits the following:
(a) Grade Ll to Classes 1 and 2,
(b) Grade L2 to Classes 1, 2, and 3,
(c) Grade L3 to Classes· I, 2, and 3,
(d) Grade L4 to Classes 1, 2, and 3,
(e) Grade L7 to Classes 1 and 2, and
(f) Grades LS, L6, and L8 are generally available in any class.
Note-The values stated in inch-pound units are to be regarded as the standard.