API 5L Pipeline PSL1 vs PSL2 Pipe Differences Summary

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API 5L Pipeline PSL1 vs PSL2 Pipe Differences Summary

Different impact test methods for PSL1 and PSL2

b. API 5L PSL1 steel line pipe not required to do the impact test.

For API 5L PSL2 steel line pipe, except Grade X80, all the other grades of API 5L line pipe required the impact test at temperature of 0℃. The average value of Akv: longitudinal direction≥41J, tranverse direction≥27J. For API 5L Grade X80 PSL2 line pipe, at 0℃ for all the size, impact test the Akv average value: longitudinal direction≥101J, tranverse direction≥68J.


PSL 1 VS. PSL 2 SPEC SHEET

*PSL1 & PSL2 requirements are given in the latest edition of API 5L specifications

Parameter

PSLl

PSL2

Grade range

A25 through X70

B through X80

Size range

0.405 through 80

4V2 through 80

Type of Pipe Ends

Plain-end, threaded-end; belled-end; special coupling pipe

Plain-end

Seam welding

All methods; continuous welding limited to Grade A25

All methods except continuous and laser welding

Electric welds: welder frequency

No minimum

100 kHz minimuiTi

Heat treatment of electric welds

Required for grades > X42

Required for all grades (B through X80)

Chemistry: max C for seamless pipe

0.28% for grades > B

0.24%

Chemistry: max C for welded pipe

0.26% for grad^ > B

0.22%

Chemistry: max P

0.030% for grades > A

0.025%

Chemistry: max S

0.030%

0.015%

Carbon Equivalent

Only when purchaser specifies SR18

Maximum required for each grade 4.2; 4.3; 6.1.3; SR15.1

Yield Strength, Maximum

None

Maximum for each grade

UTS, Maximum

None

Maximum for each grade

Fracture Toughness

None required

Required for all grades

Nondestructive 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 with- Permitted by agreement out filler metal

Prohibited

Certification

Certificates when specified per SR15

Certificates (SRI5.1) mandatory

Traceability

Traceable only until all tests are passed, unless SR 15 is specified

Traceable after completion of tests (SR15.2) mandatory


Different chemical composition for API 5L line pipe in PSL1 and PSL2

d. Chemical composition and mechanical strength is also different between API 5L PSL1 line pipe and API 5L PSL2 line pipe. For the detailed specification as below. API 5L PSL2 have restrictions with the carbon equivalent content, where for the carbon mass fraction greater than 0.12%, and equal or less than 0.12%. Different CEQ shall be applied. For line pipe in PSL2 tensile strength have maximum limits. More info please review API 5L Specification part 9.2 and 9.3.

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