An API 5L line is made by adhering to the specifications laid down by the International Organization for Standardization (ISO) 3183. It standardizes the measures for the materials, gear, and seaward designs for the petrochemical, petroleum, and natural gas industries. PSL 1 and PSL 2 are the two Product Specifications Levels that have been apperceived by the specialized board of trustees which is for the most part used in Oil and Gas Industries. PSL-1 and PSL- 2 are norms that have been set up to benefit from the more tough necessities for each grade. These two essential specifications are to a limited extent apperceived as various degrees of physical and technical requirements.

API 5L PSL1 Vs PSL2 Pipes

Grade Range A25 through X70 B through X80
Size range 0.405″ through 80″ 4.5″ through 80″
Type of ends Plain end, Threaded end,
Bevelled end special coupling pipes
Plain end
Seam welding All methods:
continuous welding
limited to A25
All methods:
except continuous welding
and laser welding
Electric welds: welder frequency No minimum kHz minimum 100
Heat treatment of electric welds Required for grades >X42 Required for all grades
(B through X80)
Chemistry: Max C for Seamless pipe 0.28% for grades ≥ B 0.24%
Chemistry: Max C for Welded pipe 0.26% for grades ≥ B 0.22%
Chemistry: Max P 0.030% for grades ≥ A 0.03%
Chemistry: Max S 0.03% 0.02%
Carbon equivalent: Only when purchaser
specifies SR18
Maximum required
for each grade
Yield strength, maximum None Maximum for each grade
UTS (Ultimate Tensile Strength)
None Maximum for each grade
Fracture toughness None required Required for all grades
Non-destructive inspection
of Seamless
Only when purchaser
specifies SR4
SR4 mandatory
Repair by welding of pipe body
plate,and skelp
Permitted Prohibited
Repair by welding of weld seams
without filler metal
Permitted by agreement Prohibited
Certification Traceable only until
all tests are passed
Certificates (SR15.1)
Traceability Traceable only until
all tests are passed
unless SR15 is specified
Traceable after completion
of tests
(SR15.2) mandatory