An API 5L steel pipe is manufactured by adhering to the specifications laid down by the International Organization for Standardization (ISO) 3183. It standardizes the criteria for the materials, equipment and offshore structures for petrochemical, petroleum and natural gas industries. PSL 1 and PSL 2 are the two Product Specification Levels that have been recognized by the technical committee which is mostly used in Oil and Gas Industries.
| PARAMETER | PSL1 | PSL2 |
| 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, | Plain end |
| Bevelled end special coupling pipes | ||
| Seam welding | All methods: | All methods: |
| continuous welding | except continuous welding | |
| limited to A25 | 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 | Maximum required |
| specifies SR18 | for each grade | |
| Yield strength, maximum | None | Maximum for each grade |
| UTS (Ultimate Tensile Strength) | None | Maximum for each grade |
| maximum | ||
| Fracture toughness | None required | Required for all grades |
| Non-destructive inspection | Only when purchaser | SR4 mandatory |
| of Seamless | specifies SR4 | |
| Repair by welding of pipe body | Permitted | Prohibited |
| plate,and skelp | ||
| Repair by welding of weld seams | Permitted by agreement | Prohibited |
| without filler metal | ||
| Certification | Traceable only until | Certificates (SR15.1) |
| all tests are passed | mandatory | |
| Traceability | Traceable only until | Traceable after completion |
| all tests are passed | of tests | |
| unless SR15 is specified | (SR15.2) mandatory |
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