An API (American Petroleum Institute) 5L line pipes are manufactured in two forms, PSL 1 and PSL 2. PSL stands for Product Specification Levels. PSL stands for Product Specification Levels. These specs cover seamless and welded steel line pipe from grades X42 through X80. API 5L is suitable for transporting gas, water, and oil, and is usually found in the hydrocarbon petroleum and natural gas industry.

PSL-1 is a loose standard quality for line pipe, whereas PSL-2 contains additional testing requirement, stricter chemical physicals, along with different ceiling limits of mechanical properties, and require Charpy impact testing conditions.

Furthermore, additional testing requirements under PSL-2 include CVN testing, non-destructive inspection of seamless products, certification to SR15, and mandatory traceability throughout the entire production process. Most FERC, DOT, or FEMSA lines require PSL-2, meaning these types of requirements are a must when supplying pipe for pipelines that are regulated by any of these governing bodies.

ParameterPSL 1PSL 2
Grade rangeA25 through X70B through X80
Max C for Seamless pipe0.28% for grades ≥ B0.24%
Max C for Welded pipe0.26% for grades ≥ B0.22%
Max P0.030% for grades ≥ A0.03%
Max S0.03%0.02%
Carbon EquivalentOnly when purchaser specifies SR18Maximum required for each grade
Yield Strength, MaxNoneMaximum for each grade
UTS (Ultimate Tensile Strength), MaxNoneMaximum for each grade
Size Range0.405″ through 80″4.5″ through 80″
Type of EndsPlain end, Threaded end, Bevelled end special coupling pipePlain End
Seam WeldingAll methods:
continuous welding
limited to A25
All methods:
except continuous welding
and laser welding
Electric Welds: Welder frequencyNo MinimumkHz minimum 100
Heat Treatment of Electric WeldsRequired for grades >X42Required for all grades (B through X80)
Fracture ToughnessNoneRequired for all grades
TraceabilityTraceable only until all tests are passed unless SR15 is specifiedTraceable after completion of tests (SR15.2) mandatory
CertificationTraceable only until all tests are passedCertificates (SR15.1) mandatory
Non-Destructive Inspection of SeamlessOnly when purchaser
specifies SR4
SR4 mandatory
Repair by Welding of Pipe Body Plate and SkelpPermitted by agreementProhibited
Repair by Welding of Weld Seams without Filler MetalPermitted by agreementProhibited

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