Longitudinal joint factor (E) for steel pipe.

(a) The longitudinal joint factor to be used in the design formula in § 192.105 is determined in accordance with the table 1 to this paragraph (a): Table 1 to Paragraph ( a ) Specification Pipe class Longitudinal joint factor (E) ASTM A53/A53M (incorporated by reference, see § 192.7) Seamless 1.00 Electric resistance welded 1.00 Furnace butt welded .60 ASTM A106/A106M (incorporated by reference, see § 192.7) Seamless 1.00 ASTM A333/A333M (incorporated by reference, see § 192.7) Seamless 1.00 Electric resistance welded 1.00 ASTM A381 (incorporated by reference, see § 192.7) Double submerged arc welded 1.00 ASTM A671/A671M (incorporated by reference, see § 192.7) Electric-fusion-welded 1.00 ASTM A672/A672M (incorporated by reference, see § 192.7) Electric-fusion-welded 1.00 ASTM A691/A691M (incorporated by reference, see § 192.7) Electric-fusion-welded 1.00 API Spec 5L (incorporated by reference, see § 192.7) Seamless 1.00 Electric resistance welded 1.00 Electric flash welded 1.00 Submerged arc welded 1.00 Furnace butt welded .60 Other Pipe over 4 inches (102 millimeters) .80 Other Pipe 4 inches (102 millimeters) or less .60 (b) If the type of longitudinal joint cannot be determined, the joint factor to be used must not exceed that designated for “Other.” [Amdt. 192-135, 89 FR 33280, Apr. 29, 2024, as amended by Amdt. 192-156, 90 FR 40763, Aug. 21, 2025]