API 5L X42 or L290 Line Pipe Description
X42 pipeline steel tubing is a seamless steel pipe made from high-quality carbon, with its material grade classified as API 5L X42, equivalent to L290 pipeline tubing.
X42 and L290 pipeline tubing include two types: seamless pipes and welded steel pipes. These pipeline tubing ends come in various forms, such as plain ends, threaded ends, and socket ends. Common connection methods for these pipeline tubing include welding, coupling connections, and socket connections.
X42 and L290 pipeline tubing are used to transport oil, gas, and water extracted from the ground through pipeline tubing to oil and gas industrial enterprises.
API 5L X42 L290 Seamless Steel Pipe Specification
Chemical Component
Mechanical Property
Test Requirement
Hydrostatic test
Pipe to withstand a hydrostatic test without leakage through the weld seam or the pipe body. Jointers need not be hydrostatic tested provide the pipe sections used were successfully tested.
Bend test
No cracks shall occur in any portion of the test piece and no opening of the weld shall occur.
Flattening test
Acceptance criteria for flattening test shall be:
EW pipes D<12.750 in:
X60 with T 500in. There shall be no opening of the weld before the distance between the plates is less than 66% of the original outside diameter. For all grades and wall, 50%.
For pipe with a D/t > 10, there shall be no opening of the weld before the distance between the plates is less than 30% of the original outside diameter.
For other sizes refer to the full API 5L specification.
CVN impact test for PSL2
Many PSL2 pipe sizes and grades require CVN. Seamless pipe is to be tested in the body. Welded pipe is to be tested in the body, pipe weld and heat-affected zone. Refer to the full API 5L specification for the chart of sizes and grades and required absorbed energy values.
