1. (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	Longitudinaljoint 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

2. (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]