What is the Difference Between PSL1 And PSL2 Pipes?

API 5L line pipe is available in two types: PSL 1 and PSL 2. But what is a PSL? PSL stands for Product Specification Level. PSL stands for Product Specification Level.

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

Chemical Properties

PARAMETER	PSL1	PSL2
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

 

Mechanical Properties 

PARAMETER	PSL1	PSL2
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 pipes, there are limits on the maximum yield strength and ultimate tensile strength, while for PSL1 pipes, meeting the minimum requirements is sufficient. The second mandatory requirement for PSL2 pipes is fracture toughness, which is not required for PSL1 pipes.