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

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An API 5L line pipes 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 the severe corrosive environments required material that can withstand such process conditions. On the other hand for normal services, a standard quality level pipe will also serve the purpose.    

Difference 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 pipe 0.28% for grades ≥ B 0.0024
Chemistry:   Max C for Welded pipe 0.26% for grades ≥ B 0.0022
Chemistry:   Max P 0.03% for grades ≥ A 0.0003
Chemistry:   Max S 0.0003 0.0002
Carbon   equivalent: Only when purchaser   specifies SR18 Maximum 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 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 maximum carbon is 0.22%. 

The second element is Phosphorus.

For PSL1 pipe, Maximum Phosphorus is 0.03% for the 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, 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, maximum None Maximum for each grade
UTS (Ultimate Tensile Strength) maximum None Maximum for each grade
Fracture toughness None required Required for all grades

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

The difference between PSL1 & PSL2 Pipes Manufacturing 

Grade   Range A25 through X70 B through X80
Size   range 0.405″ through 80″ 4.5″ through 80″
Type   of ends Plain end, Threaded   end,Bevelled end special coupling pipes Plain end
Seam   welding All methods: continuous   welding limited to A25 All methods: except   continuous welding and laser welding
Electric   welds: welder frequency No minimum kHz minimum 100
Heat   treatment of electric welds Required for grades   >X42 Required 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 grade A25 through X70 whereas PSL2 pipes are available in Grade B through X80.

PSL1 pipes are available through size 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 end such as Plain end, Threaded end, Bevelled end, special coupling pipes whereas PSL2 pipes are available in only 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 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 pipe, it is required for grades higher than X42.

Inspection and Defect Repair 

Non-destructive   inspection of Seamless Only when purchaser   specifies SR4 SR4 mandatory
Repair   by welding of pipe body plate, and skelp Permitted Prohibited
Repair   by welding of weld seams without filler metal Permitted by agreement Prohibited   

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

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

Certification Traceable only until all tests are passed Certificates (SR15.1) mandatory
Traceability Traceable only until all tests are passed unless SR15 is specified Traceable 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 pipe for normal services and PSL2 pipes are higher quality pipe than PSL1. 

Differance Between API 5L Line Pipe PSL1 and PSL2

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