In this article, I will explain about PSL1 Vs PSL2 API 5L Linepipe. Many people find it difficult to identify differences between PSL1 And PSL2 Pipes. (PSL1 Vs. PSL2 Pipes)

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An API 5L line pipe is manufactured in two varieties, PSL 1 and PSL 2. But what is PSL? PSL stands for Product Specification Levels. PSL stands for Product Specification Levels.

Pipes are used in different types of environments, such as corrosive and non-corrosive.  Pipes used in severely corrosive environments require material that can withstand such process conditions. On the other hand, a standard quality level pipe for normal services will also serve the purpose.    

Differences between PSL1 and PSL2 pipes are as follows;

  • Chemical Properties
  • Mechanical Properties
  • Manufacturing Methods
  • Inspection and Defect Repair
  • Certification & Traceability

Chemical Properties

Chemistry:   Max C for Seamless pipe0.28% for grades ≥ B0.0024
Chemistry:   Max C for Welded pipe0.26% for grades ≥ B0.0022
Chemistry:   Max P0.03% for grades ≥ A0.0003
Chemistry:   Max S0.00030.0002
Carbon   equivalent:Only when purchaser   specifies SR18Maximum required for   each grade   

Three elements change when requirements change from PSL1 to PSL2.

The first is Carbon.

Maximum Carbon for Seamless PSL1 pipe is 0.28% for grade B & higher. For all grades of PSL2 pipes, the maximum carbon is 0.24%.

Similarly, for welded PSL1 pipe, Maximum Carbon is 0.26% for grade B & higher. For all grades of PSL2 welded pipes, the maximum carbon is 0.22%. 

The second element is Phosphorus.

For PSL1 pipe, Maximum Phosphorus is 0.03% for grade A & higher. For all grades of PSL2 pipes, the maximum Phosphorus is 0.03%. So, the only difference is a grade lower than A.

The third element is Sulphur.

For PSL1 pipe, the Maximum Sulphur is 0.03%. For PSL2 pipes maximum Sulphur is 0.02%.

Other than these three elements, for PSL2 pipe meeting, the Carbon equivalent is mandatory, whereas, for PSL1 pipe, it is only required if the purchaser has specified SR18. SR18 means Supplementary Requirement No.18.

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Mechanical Properties 

Yield strength, maximumNoneMaximum for each grade
UTS (Ultimate Tensile Strength) maximumNoneMaximum for each grade
Fracture toughnessNone requiredRequired for all grades

For PSL2 pipe, there is a limit on Maximum Yield & Ultimate Tensile Strength, whereas for PSL1 pipe, meeting the minimum requirements is sufficient. The second requirement that is mandatory for the PSL2 pipe is Fracture toughness which is not required for the PSL1 pipe.

The difference between PSL1 & PSL2 Pipes Manufacturing 

Grade   RangeA25 through X70B through X80
Size   range0.405″ through 80″4.5″ through 80″
Type   of endsPlain end, Threaded   end,Bevelled end special coupling pipesPlain end
Seam   weldingAll methods: continuous   welding limited to A25All methods: except   continuous welding and laser welding
Electric   welds: welder frequencyNo minimumkHz minimum 100
Heat   treatment of electric weldsRequired for grades   >X42Required for all grades   (B through X80)   

Here in this table, you can see the differences between PSL1 & PSL2 Pipes Manufacturing. PLS1 pipes are available in grades A25 through X70, whereas PSL2 pipes are available in Grade B through X80.

PSL1 pipes are available in sizes 0.405” to 80”, whereas the smallest diameter pipe available in PSL2 is 4.5” and the largest diameter is 80”.

PSL1 pipes are available in different types of ends, such as Plain end, Threaded end, Bevelled end, and special coupling pipes, whereas PSL2 pipes are available only in Plain End.

All kinds of welding methods are acceptable to manufacture PSL1; however, continuous welding is limited to Garde A25. For PSL2 welded pipes, except continuous welding and laser welding, all other welding methods are acceptable.

For electric weld welder frequency for PSL2 pipe is a minimum 100kHz, whereas there is no such limitation on the PLS1 pipe.  Heat treatment of electric welds is required for all Grades of PSL2 pipes, whereas for PSL1 pipes, it is required for grades higher than X42.

Inspection and Defect Repair 

Non-destructive   inspection of SeamlessOnly when purchaser   specifies SR4SR4 mandatory
Repair   by welding of pipe body plate, and skelpPermittedProhibited
Repair   by welding of weld seams without filler metalPermitted by agreementProhibited   

Non-destructive inspection of a seamless pipe is mandatory for PSL2 pipe, whereas for PLS1 pipe, it is a supplementary requirement. 

Repair of pipe body plate and skelp by welding is not allowed in PSL2 pipes, whereas it is allowed in PSL1 pipes. Similarly, weld repair without filler metal is not allowed in PSL2 pipes, whereas it is allowed with the purchaser’s permission in PSL1 pipes.

Certification & Traceability

CertificationTraceable only until all tests are passedCertificates (SR15.1) mandatory
TraceabilityTraceable only until all tests are passed unless SR15 is specifiedTraceable after completion of tests (SR15.2) mandatory

For PSL1 pipes, Traceability & Certification is not required beyond the point it passes all the required tests whereas, for PSL2 pipes, Traceability & Certification is mandatory.

In short PSL1 pipes are standard quality pipes for normal services, and PSL2 pipes are higher quality pipes than PSL1. 

Differance Between API 5L Line Pipe PSL1 and PSL2

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