Mainly introduce the API 5L standards and list the detailed requirement of PSL1 and PSL2 pipeline.
API 5L generally refers to the implementation standard of line pipe, line pipe is used to extract oil, gas, water and others and transport to the oil and gas pipeline industry enterprises. It includes seamless steel pipe and welded steel pipe two categories, our current commonly used in oil pipeline are SSAW steel pipe, LSAW steel pipe, ERW steel pipe, seamless steel pipe is usually chosen when the pipe diameter is less than 152mm.
There are many kinds of steel grade for raw materials in API 5L standard: GR.B, X42, X46, X52, X56, X60, X70, X80, etc. Different steel grade, different requirements for raw materials and production, and the carbon equivalent between different steel grades are strictly controlled.
As far as API 5L is concerned, everyone knows, there are PSL1 and PSL2 two standards, although only one word, but the two standard content is very different.
1, PSL is short for the product specification levels. Product specification level pipeline is divided into PSL1 and PSL2, it can be said the quality level is divided into PSL1 and PSL2. PSL2 is higher than PSL1, these two specification levels not only have different testing requirements, and the chemical composition, mechanical properties requirements are different, so when ordering according to API 5L, terms of the contract in addition to the usual indicators of the size and grade, must also indicate the product specification level, ie PSL1 or PSL2. PSL2 in chemical composition, tensile properties, the impact energy, non-destructive testing and other indicators are more stringent than PSL1.
2, PSL1 do not require impact test.
For PSL2 all steel grades except the X80, the full-size 0 Akv average: Portrait ≥ 41J, transverse ≥27J. For X80 steel grade, full-size 0 Akv average: Portrait ≥101J, transverse ≥68J.
3, the pipeline should be supported by the hydrostatic test one by one, but the standard does not specify allowing non-destructive to replace hydrostatic test, which is also a big difference between the API standards and our standards. PSL1 does not require non-destructive testing, PSL2 should be supported by non-destructive testing one by one.
4, PSL1 seamless steel pipe melting analysis and product analysis chemical composition Steel grade and category C Mn P S Ti other Max a Max a Min Max Max Max A25,` 0.21 0.60 - 0.030 0.030 - -A25,a 0.21 0.60 0.045 0.080 0.030 - -A 0.22 0.90 - 0.030 0.030 - -B 0.28 1.20 - 0.030 0.030 0.04 b,c,dX42 0.28 1.30 - 0.030 0.030 0.04 c,dX46,X52,X56 0.28 1.40 - 0.030 0.030 0.04 c,dX6O f 0.28 1.40 - 0.030 0.030 0.04 c,dX65 f ,X70 f 0.28 1.40 - 0.030 0.030 0.06 c,d
PSL2 seamless steel pipe melting analysis and product analysis chemical composition
Steel grade Cmaxa Mnmaxa Pmax Smax Timax vƒB 0.24 1.20 0.025 0.015 0.04 d,eX42 0.24 1.30 0.025 0.015 0.04 c,dX46,x52,x56,x60f 0.24 1.40 0.025 0.015 0.04 c,dX65 f,X70 f,X80 f 0.24 1.40 0.025 0.015 0.06 c,d
Note:
5, PSL1 stretch requirement
steel grade yield strength tensile strength 2in (50.8mm) gauge length minimum elongation (%)
Min Min
psi MPa psi MPaA25 25000 172 45000 310
A 30000 207 48000 331 B 35000 241 60000 414 X42 42000 290 60000 414 X46 46000 317 63000 434 X52 52000 359 66000 455 X56 56000 386 71000 490 X60 60000 414 75000 517 X65 65000 448 77000 531 X70 70000 483 82000 565 PSL2 stretch requirement
steel grade yield strength tensile strength 2in (50.8mm) gauge length minimum elongation (%)
Min Max Min Max psi MPa psi MPa psi MPa psi MPa
B 35000 241 65000 448 60000 414 110000 758 X42 42000 290 72000 496 60000 414 110000 758 X46 46000 317 76000 524 63000 434 110000 758 X5 52000 359 77000 531 66000 455 110000 758 X56 56000 386 79000 544 71000 490 110000 758 X60 60000 414 82000 565 75000 517 110000 758 X65 65000 448 87000 600 77000 531 110000 758 X70 70000 483 90000 621 82000 565 110000 758 X80 80000 552 100000e 690 90000 621 12000
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