API 5L PSL-2 is one of the levels in the API 5L standard indicates the minimum requirements that line pipe products must meet to be compliant with the standard. PSL-1 is the entry-level, and it covers basic chemical and mechanical properties, such as strength and toughness. PSL-2 is the higher level, and it has stricter requirements for chemical composition, mechanical properties, weldability, and nondestructive testing. To meet the PSL-2 quality requirements, manufacturers must undergo a more stringent testing regime during production. As a result, products that are certified to PSL-2 are typical of a higher quality than those certified to PSL-1.

The American Petroleum Institute‘s API 5L specification is for Line Pipe used in pipelines for transporting oil, natural gas, and water. It is the most common specification used for this purpose. The API 5L covers two different product specifications; one for PSL 1 Grades A through X70, and the other for PSL 2 Grades B through X80. 

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What is the Difference between API 5L PSL-1 and PSL-2?

There are two levels of pipe in the API 5L specification: PSL-1 and PSL-2. PSL-1 and PSL-2 levels are determined by different tests measuring various properties. The levels indicate the strictness of quality requirements. PSL-1 levels are less strict than PSL-2 levels. For example, the chemical test for PSL-1 levels measures fewer elements than the chemical test for PSL-2 levels. The mechanical tests for PSL-1 levels (tensile, yield, elongation) have lower requirements than the mechanical tests for PSL-2 levels. The test frequency is also higher for PSL-2 levels than for PSL-1 levels. In general, PSL-2 levels indicate a higher quality product than PSL-1 levels.

Chemical Composition for API 5L PSL-2 Pipe with t ≤ 0.984”

Chemical Composition of API 5L PSL-2 Line Pipe

Mechanical Property for API 5L PSL-2 Pipes

Tensile Test Result of API 5L PSL 2 Line Pipe

Dimensions and Sizes of API 5L psl-2 Line Pipe

When purchasing an API 5L PSL-2 line pipe, it is crucial to check that the pipe meets the required standards. One way to do this is to refer to the dimensions and masses of API 5L line pipes specified in ISO 4200 and ASME B36.10M. These standards provide guidance for different size pipes and specify the wall thickness of each size. Checking that a particular pipe meets the requirements in these tables will help to ensure that it is the right size and has the correct wall thickness. Doing so is essential for ensuring that the pipe will be compatible with the rest of the system and function properly.


API 5L PSL-2 Pipe Delivery Conditions

PSLDelivery ConditionSteel Grade
API PSL-2As-rolledBR, X42R
Normalizing rolled, normalizing formed, normalized or normalized and temperedBN, X42N, X46N, X52N, X56N, X60N
Quenched and temperedBQ, X42Q, X46Q, X56Q, X60Q, X65Q, X70Q, X80Q, X90Q, X100Q
Thermomechanical rolled or thermomechanical formedBM, X42M, X46M, X56M, X60M, X65M, X70M, X80M
Thermomechanical rolledX90M, X100M, X120M
The suffice (R, N, Q or M) for PSL2 grades, belongs to the steel grade -

Test and inspection of API 5L psl-2 Line pipes

- Hydrostatic Test

The hydrostatic test is a water-based test used to find leaks in weld seams and pipe body. To conduct the test, water is pumped into the pipeline at a pressure that is greater than the operating pressure of the pipeline. The water pressure is then held for a period of time while the pipeline is monitored for leaks. If no leaks are detected, the pipeline passes the hydrostatic test and can be put into service. However, if a leak is found, the pipeline must be repaired before it can be used. The hydrostatic test is an important part of pipeline production, as it helps to ensure that pipelines are safe and reliable.

- Bend Test

The bend test is a quality control check that is carried out during the production of metal pipes. The test involves taking a sample of the pipe and then bending it to a set degree. This is done to check that the pipe is not too brittle and that it will not crack under pressure. The bend test is an important part of quality control as it helps to ensure that the finished product is safe and fit for its purpose.

- Flattening Test

The flattening test is a destructive test that is used to determine the resistance of a material to crack propagation. The test specimen is supported at two ends and a load is applied perpendicular to the specimen. The crack propagates through the specimen until it reaches the support, at which point the specimen fractures. The flattening test is used to assess the crack propagation characteristics of materials such as pipelines, which are subjected to both longitudinal and circumferential stresses. The results of the flattening test can be used to predict the service life of a pipeline and to design a pipe with improved resistance to crack propagation.

- CVN Impact Test

In pipeline production, an impact test is an essential quality control measure. The test is used to assess the pipe body, weld seam, and heat-affected zone for potential vulnerabilities. The test involves exposing the sample to extreme temperatures and then measuring the amount of energy required to break the material. This information is used to determine the strength and durability of the pipeline. Impact testing is an important part of quality control in pipeline production, and it helps to ensure that the finished product is safe and reliable.


DWTT is an impact test used to measure the strength of metal pipes. The test involves dropping a weight onto the pipe, and then measuring the amount of deformation that occurs. DWTT is often used for large diameter pipes, as it can provide a more accurate assessment of impact strength than other methods. DWTT tests are typically conducted using a variety of different weights, in order to assess the impact strength of the pipe at different points. The results of DWTT testing can be used to improve the impact resistance of pipes, and to help ensure that they can withstand the rigors of production.


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