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IIL API Line Pipe

Used in natural gas and petroleum distribution systems, IIL's API Line Pipe are longitudinal electric welded steel pipe available in PSL1 and PSL2 specification made in accordance with ANSI/API specification 5L under license: API-0391 and API-1104.

IIL API line pipes are marked and embossed (inside or outside) according to customer requirements. The nominal diameter of IIL line pipes ranges from ¾" to 12 ¾" with the length ranging from 6 meters to 12.20 meters.

Tube Mill Section

IIL's state-of-the-art U.S. and Japanese tube mills are used for the manufacturing of API line pipe and are equipped with:

  • Solid state/high frequency welder (from Thermatool, UK)
    • For high integrity forge welding
  • Seam annealing
    • The weld seam and entire heat affected zone is heat treated and processed to ensure no un-tempered Martensite remains on the heat affected zone.
  • Inner Bead Trimming (Diameter 4" and 6")
    • Carried out to meet API Specification 5L

Product Testing Features

  • NDT unit (Eddy Current Flaw Detector)
    • Eddy Current testing is used to detect surface and internal flaws or imperfections like seam, slivers, open weld and incomplete welds
  • Hydrostatic Tests
    • Each length of IIL API Line Pipe is manufactured to withstand leakage at hydrostatic test pressure are specified in the standard. In order to ensure that every length of pipe is tested, the hydro testers at IIL are equipped with a test pressure gauge and timer. We ensure that no pipe is dispatched until hydro testing has been performed. Size and grade wise hydrostatic test pressures are given in table overleaf
Product Range As per API-5L
Size (Inches) Diameter
(mm)		 Thickness
(mm)		 Grade
L175 or
A25		 Grade
L210 or
A		 Grade
L245 Or
 B		 Grade L90 Or X42 Grade L320 or X46 Grade L360 or X52 Grade L390 or X56 Grade L415 or X60 Grade L450 or X65 Grade L845 or X70
3/4" 26.7 2.87 * * *              
1" 33.4 3.38 * * *              
2 3/8" 60.3 3.91 * * * * *          
4 1/2" 114.3 4.78 * * * * *          
6 5/8" 168.3 4.78 * * * * * * * * * *
8 5/8" 219.1 4.78-7.04   * * * * * * * * *
10 3/4" 273.1 5.56   * * * * * * *    
12 3/4" 323.8 5.56-9.5   * * * * * * * * *

 

API Specification PSL-1
Grade Yield Strength Tensile Strength Elongation
Minimum Minimum
psi Mpa psi Mpa
L175 or A25 25 400 175 45 000 310 a
L210 or A 30 500 210 48 600 335 a
L245 or B 35 500 245 60 200 415 a
L290 or X42 42 100 290 60 200 415 a
L320 or X46 46 400 320 63 100 435 a
L360 or X52 52 200 360 66 700 460 a
L390 or X56 56 600 390 71 100 490 a
L415 or X60 60 200 415 75 400 520 a
L450 or X65 65 300 450 77 600 535 a
L485 or X70 70 300 485 82 700 570 a
API Specification PSL-2
Grade Yield Strength Tensile Strength Elongation
Minimum Maximum Minimum Maximum
psi Mpa psi Mpa psi Mpa psi Mpa
L175 or A25 35 500 245 65 300 450 60 200 415 95 000 665 b
L210 or A 42 100 290 71 800 495 60 200 415 95 000 665 b
L245 or B 46 400 320 76 100 525 63 100 435 95 000 665 b
L290 or X42 52 200 360 76 900 530 66 700 460 110 200 760 b
L320 or X46 56 600 390 79 000 545 71 100 490 110 200 760 b
L360 or X52 60 200 415 81 900 565 75 400 520 110 200 760 b
Hydro Static Pressure
Size (Inches) Diameter
(mm)		 Wall Thickness
(mm)		 Minimum Test Pressure (psi) w.r.t each grade
A25 A B X42 X46 X52 X56 X60 X65 X70
3/4" 27 3 700 700 700              
1" 33 3 700 700 700              
2 3/8" 60 4 1976 2373 2762 3270 3579          
4 1/2" 114 5 1275 1531 1781 2113 2329          
6 5/8" 168.3 4.78   1040 1210 1435 1581 1779 1929 2052 2226 2396
8 5/8" 219.1 4.78-7.04   798-1176 929-1369 1102-1623 1215-1789 1367-2013 1482-2182 1576-2321 1710-2518 1840-2711
10 3/4" 273.1 5.56   745 867 1028 1134 1275 1383 1471    
12 3/4" 323.9 5.56-9.50   628-1073 731-1249 867-1482 956-1633 1075-1837 1166-1992 1240-2119 1345-2298 1448-2474