P = (2 St/D) x E x F
P = internal design pressure in p.s.i. (kPa) gauge.
S = yield strength in pounds per square inch (kPa) determined in accordance with §30161. B
t = nominal wall thickness of the pipe in inches (millimeters). If this is unknown, it is determined in accordance with §30161. C
D = nominal outside diameter of the pipe in inches (millimeters).
E = seam joint factor determined in accordance with §30161. E
F = a design factor of 0.72, except that a design factor of 0.60 is used for pipe, including risers, on a platform located off-shore or on a platform in inland navigable waters, and 0.54 is used for pipe that has been subjected to cold expansion to meet the specified minimum yield strength and is subsequently heated, other than by welding or stress relieving as a part of welding, to temperature higher than 900 ° F (482 ° C) for any period of time or over 600 ° F (316 ° C) for more than one hour. [ 49 CFR 195.106(a) ]
Pipeline Size | Number of Tests |
Less than 6-5/8 in. (168.3 mm) nominal outside diameter | One test for each 200 lengths |
6-5/8 through 12-3/4 in. (168 through 323 mm.) nominal outside diameter | One test for each 100 lengths |
Larger than 12-3/4 in. (324 mm.) nominal outside diameter | One test for each 50 lengths |
Specification | Pipe Class | Seam Joint Factor |
ASTM A53 | Seamless | 1.00 |
Electric resistance welded | 1.00 | |
Furnace lap welded | 0.80 | |
Furnace butt welded | 0.60 | |
ASTM A106/ | Seamless | 1.00 |
ASTM A333/A333M | Seamless | 1.00 |
Welded | 1.00 | |
ASTM A381 | Double submerged arc welded | 1.00 |
ASTM A671/A671M | Electric fusion welded | 1.00 |
ASTM A672/A672M | Electric fusion welded | 1.00 |
ASTM A691/A691M | Electric fusion welded | 1.00 |
ANSI /API 5L | Seamless | 1.00 |
Electric resistance welded | 1.00 | |
Electric flash welded | 1.00 | |
Submerged arc welded | 1.00 | |
Furnace lap welded | 0.80 | |
Furnace butt welded | 0.60 |
La. Admin. Code tit. 33, § V-30161