Short answer: API 5L is the global standard for line pipe that carries oil, gas, and water. It spans Grade B through high-strength X-grades and two product specification levels (PSL1, PSL2). This guide explains the grades, PSL difference, and seamless vs welded choice so you can specify line pipe with confidence.
At a Glance
What API 5L Covers
API 5L defines seamless and welded steel line pipe for pipeline transportation of gas, water, and oil. Grades run from Grade B up through X42, X52, X60, X65, and X70, with rising yield strength for higher-pressure, long-distance lines.
Grades and Yield
The chart lists common grades and their minimum yield. X52-X70 dominate new high-pressure lines; Grade B and X42 serve lower-pressure and gathering lines. See seamless vs welded pipe for the manufacturing choice.
PSL1 vs PSL2
PSL2 adds stricter chemical, toughness, and non-destructive testing requirements for sour service and higher risk. Choose PSL2 for critical, high-pressure, or H2S-exposed lines; PSL1 for less demanding service. See our ASTM/ASME carbon-steel pipe standards.
Seamless or Welded?
Seamless suits high-pressure and sour service; welded (ERW, LSAW, SSAW) covers large diameters economically. For corrosion duty consider coated or galvanized finishes.
Get a Quote
Tell HXSCO the grade, PSL, diameter, wall, and quantity and we will quote line pipe with MTC and API 5L certification.
Frequently Asked Questions
Steel pipe built to the API 5L standard for transporting oil, gas, and water in pipelines.
PSL2 has tighter chemistry, toughness, and testing for critical/higher-risk service; PSL1 is for less demanding lines.
Higher X-grades give more yield strength for high-pressure, long-distance lines; Grade B/X42 suit lower-pressure service.
Seamless for high-pressure and sour service; welded (ERW/LSAW/SSAW) for large diameters and lower cost.
Yes – HXSCO sources API 5L line pipe across grades and PSL levels with mill-test certification.
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