API 5L Line Pipe
API Spec 5L (46th Edition, 2018) specifies seamless and welded steel line pipe for petroleum and natural gas transportation systems, covering grades A25 through X80 (L175–L555 and higher by agreement) in PSL1 and PSL2 product specification levels..
Scope
API Spec 5L (46th Edition, 2018) specifies seamless and welded steel line pipe for petroleum and natural gas transportation systems, covering grades A25 through X80 (L175–L555 and higher by agreement) in PSL1 and PSL2 product specification levels.
Mechanical & Performance Requirements
PSL2 tensile requirements (body): yield strength Rt0.5 and tensile strength Rm with both min and max limits per grade — e.g. L245/B: YS 245–450 MPa, TS 415–760 MPa; L360/X52: YS 360–530 MPa, TS 460–760 MPa; higher grades up to X80. PSL1 specifies minimum values only. Elongation, CVN impact (PSL2), and weld-seam tensile requirements apply.
Dimensional Tolerances
OD tolerance: ±0.5 mm or ±0.0075D (D < 60.3 mm); ±0.75% D (60.3–610 mm); ±1% D (610–1422 mm). Wall (SMLS): +15%/−12.5% (4.0–25.0 mm); HFW: ±0.4 mm ≤6.0 mm. Weight tolerance +10%/−3.5% (Gr. B and above, normal wall). Length tolerance ±500 mm for specified lengths.
NDE & Hydrostatic Testing
100% hydrostatic test on every pipe (ring stress per grade, e.g. 90–95% SMYS depending on class); NDE of weld seam and body by automatic ultrasonic (ISO 10893-10/-11) or electromagnetic methods per PSL2 Table 21/23; ultrasonic wall-thickness verification. Hydro test cannot be replaced by NDE.
Products We Supply to This Standard
| Applicable products | Link |
|---|---|
| LSAW Steel Pipe | View products → |
| SSAW Steel Pipe | View products → |
| Welded Line Pipe | View products → |
| Seamless Line Pipe | View products → |
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