Difference Between PSL1 and PSL2 Pipe

The American Petroleum Institute (API) designates different specifications of API line pipe. There are two specs PSL-1 and PSL-2 comes under API 5L. These specs cover seamless and welded API steel line pipe from grades X42 through X80. API 5L Line Pipes is suitable for transporting fluids such as gas, water, and oil, and is usually found in the hydrocarbon petroleum and natural gas industry. PSL-1 and PSL-2 are standards that have been put in place to help with the more strict requirements for each grade. API 5L PSL2 are known for better performance in comparison to PSL1 as it has stricter inspection requirements, chemical composition and mechanical performance requirements. API Line pipe production should include the hydraulic pressure test, and standards are not allowed to nondestructive generation of hydraulic pressure, nondestructive inspection is not required for PSL1, while each API 5L PSL2 pipe shall go through nondestructive examination one by one.

PSL1

PSL1 Chemical Composition

TYPE Steel grade C Si Mn P S
API 5L PSL1 B ≤0.28 - ≤1.20 ≤0.03 ≤0.03
API 5L PSL1 X42 ≤0.28 - ≤1.3 ≤0.03 ≤0.03
API 5L PSL1 X46 ≤0.28 - ≤1.4 ≤0.03 ≤0.03
API 5L PSL1 X52 ≤0.28 - ≤1.4 ≤0.03 ≤0.03
API 5L PSL1 X56 ≤0.28 - ≤1.4 ≤0.03 ≤0.03
API 5L PSL1 X60 ≤0.28 - ≤1.4 ≤0.03 ≤0.03
API 5L PSL1 X70 ≤0.28 - ≤1.4 ≤0.03 ≤0.03

PSL1 Mechanical Properties

TYPE Steel grade Tensile strength (Mpa) Yield strength (Mpa) Elongation
API 5L PSL1 B ≥415 ≥245 As per API 5L
API 5L PSL1 X42 ≥415 ≥290 As per API 5L
API 5L PSL1 X46 ≥435 ≥320 As per API 5L
API 5L PSL1 X52 ≥460 ≥360 As per API 5L
API 5L PSL1 X56 ≥490 ≥390 As per API 5L
API 5L PSL1 X60 ≥520 ≥415 As per API 5L
API 5L PSL1 X70 ≥565 ≥483 As per API 5L

API SPEC 5L PSL1

A25 172 310
A 207 331
B 241 414
X42 290 414
X46 317 434
X52 359 455
X56 386 490
X60 414 517
X65 448 531
X70 483 565

PSL2

Chemical composition PSL2

Standard Grade C Mn P   S
Max Max Min Max Max
API SPEC 5L PSL1
A25II 0.21 0.60   0.030 0.030
A25III 0.21 0.60 0.45 0.80 0.030
A 0.22 0.90 0.030 0.030
B 0.28 1.20 0.030 0.030
X42 0.28 1.30 0.030 0.030
X46.X52.X56 0.28 1.40 0.030 0.030
X60.X65.X70 0.28 1.40 0.030 0.030
PSL2
B 0.24 1.20 0.025 0.015
X42 0.24 1.30 0.025 0.015
X46.X52.X56 0.24 1.40 0.025 0.015
X60.X65.X70.X80 0.24 1.40 0.025 0.015

API SPEC 5L PSL2

Min Max Min Max
B 241 448 414 758
X42 290 496 414 758
X46 317 524 434 758
X52 359 531 455 758
X56 386 544 490 758
X60 414 565 517 758
X65 448 600 531 758
X70 483 621 565 758
X80 552 690 621 827

PARAMETER
PSL1
PSL2
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)

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