API 5L steel pipe is also known as line pipe -API 5L line pipe . The material for line pipe steel includes grades: GR.B, X42, X46, X52, X56, X60, X65, X70.
Line pipe is used to transport oil, gas, and water extracted from the ground through pipelines to oil and gas industrial enterprises. Line pipe includes both seamless pipe and welded steel pipe, with pipe ends available in plain end, threaded end, and socket end. The connection methods include welding, coupling connection, and socket connection.
Specification
1. Out diameter: 406.4mm - 1422.4mm (16"-56")
2. Thickness: 8mm-50mm
3. Length: 6m-13m
4. Type: LSAW (Longitudinal Submerged-Arc Welded), DSAW (Double Submerged-arc welded) Steel Pipe
5. Manufacturing Process: UO(UOE), RB(RBE), JCO(JCOE,COE)
6. Standard: API SPEC 5L (ISO 3183), GB/T 9711.1, GB/T 9711.2, GB/T 9711.3
7. Uses: for conveying gas, water and oil, in the oil or natural gas industries
Chemical Analysis (%)
| Standard | Type of pipe | Class | Grade | C(max) | Si(max) | Mn(max) | P(max) | S(max) | V(max) | Nb(max) | Ti(max) |
|
API SPEC 5L /ISO 3183 |
WELD | PSL1 | L245 B | 0.26 | - | 1.2 | - | 0.03 | 0.03 | - | - |
| L290/X42 | 0.26 | - | 1.3 | - | 0.03 | 0.03 | - | - | |||
| L320/X46 | 0.26 | - | 1.4 | - | 0.03 | 0.03 | - | - | |||
| L360/X52 | 0.26 | - | 1.4 | - | 0.03 | 0.03 | - | - | |||
| L390/X56 | 0.26 | - | 1.4 | - | 0.03 | 0.03 | - | - | |||
| L415/X60 | 0.26 | - | 1.4 | - | 0.03 | 0.03 | - | - | |||
| L450/X65 | 0.26 | - | 1.45 | - | 0.03 | 0.03 | - | - | |||
| L485/X70 | 0.26 | - | 1.65 | - | 0.03 | 0.03 | - | - | |||
| PSL2 | L245M/GR.BM | 0.22 | 0.45 | 1.2 | 0.025 | 0.015 | 0.05 | 0.05 | 0.04 | ||
| L290M/X42M | 0.22 | 0.45 | 1.3 | 0.025 | 0.015 | 0.05 | 0.05 | 0.04 | |||
| L320M/X46M | 0.22 | 0.45 | 1.3 | 0.025 | 0.015 | 0.05 | 0.05 | 0.04 | |||
| L360M/X52M | 0.22 | 0.45 | 1.4 | 0.025 | 0.015 | - | - | - | |||
| L390M/X56M | 0.22 | 0.45 | 1.4 | 0.025 | 0.015 | - | - | - | |||
| L415M/X60M | 0.12 | 0.45 | 1.6 | 0.025 | 0.015 | - | - | - | |||
| L450M/X65M | 0.12 | 0.45 | 1.6 | 0.025 | 0.015 | - | - | - | |||
| L485M/X70M | 0.12 | 0.45 | 1.7 | 0.025 | 0.015 | - | - | - | |||
| L555M/X80M | 0.12 | 0.45 | 1.85 | 0.025 | 0.015 | - | - | - |
Mechanical Properties
| Standard | Class | Grade | Yield Strength(MPa) | Tensile Strength(MPa) | Elongation(%) | Y.S/T.S | |
| API SPEC 5L /ISO 3183 | PSL1 | L245/GR.B | min | 245 | 415 | b | - |
| L290/X42 | min | 290 | 415 | b | - | ||
| L320/X46 | min | 320 | 435 | b | - | ||
| L360/X52 | min | 360 | 460 | b | - | ||
| L390/X56 | min | 390 | 490 | b | - | ||
| L415/X60 | min | 415 | 520 | b | - | ||
| L450/X60 | min | 450 | 535 | b | - | ||
| L485/X70 | min | 485 | 570 | b | - | ||
| PSL2 | L245N/BN L245M/BM | min | 245 | 415 | b | - | |
| max | 450 | 760 | b | 0.93 | |||
| L290N/X42N L290M/X42M | min | 290 | 415 | b | - | ||
| max | 495 | 760 | b | 0.93 | |||
| L320N/X46N L320M/X46M | min | 320 | 435 | b | - | ||
| max | 525 | 760 | b | 0.93 | |||
| L360N/X52N L360M/X52M | min | 360 | 460 | b | - | ||
| max | 530 | 760 | b | 0.93 | |||
| L390N/X56N L390M/X56M | min | 390 | 490 | b | - | ||
| max | 545 | 760 | b | 0.93 | |||
| L415N/X60N L415M/X60M | min | 415 | 520 | b | - | ||
| max | 565 | 760 | b | 0.93 | |||
| L450M/X65M | min | 450 | 535 | b | - | ||
| max | 600 | 760 | b | 0.93 | |||
| L485M/X70M | min | 485 | 570 | b | - | ||
| max | 635 | 760 | b | 0.93 | |||
| L555M/X80M | min | 555 | 625 | b | - | ||
| max | 705 | 825 | b | 0.93 |
Hydrostatic Test
API 5L pipe shall be performed a hydrostatic test without leakage through the weld seam or the pipe body. Jointers between the pipes no need to do the hydrostatic test where the sections used were successfully tested.
Bend Test
Cracks should not occur in any point of the test sample and opening of weld shall not occur as well.
Please Note: For all bend test, the weld extends to a distance of 6.4 mm (0.25 in) on each side of fusion line.
Dimensions tolerance for API 5L seamless pipe
a. For outer diameters less than 2 3/8 in (60.3 mm), pipe body diameter tolerance +/-0.5 mm. Pipe end +/- 0.5 mm; Out of Roundness tolerance for pipe body is 0.9 mm (0.036 in), pipe end 0.6 mm (0.024 in).
b. For OD equal or above 2 3/8 in (60.3) to 24 in (610 mm), (diameter tolerance) for pipe body is +/- 0.0075D, pipe end +/- 0.005D but max to +/- 1.6 mm (0.063mm); Roundness tolerance for pipe body ≤ 0.015D, pipe end ≤ 0.01D.
(In case agreed with manufacturer and client, more strictly tolerances could be applied)
c. For wall thickness
Below than 4 mm (0.0157 in), tolerance +0.6 (0.024 in), -0.5 mm (0.020 in);
For API 5L seamless steel pipe thickness in 4 mm to 10 mm (0.394 in), +0.150t, -0.125t;
For API seamless pipe thickness 10 mm to 25mm (0.984 in), +/-0.125t;
Wall thickness ≥ 25 mm, +3.7mm or +0.1t (if larger) and -3.0 mm (0.120 in) or -0.1t (if larger).
t for thickness;
d. For straightness, max for full length, tolerance maximum 0.15% of length.
e. Straightness, max deviation for pipe end, shall be ≤ 0.3 mm /m.
f. Length +/- 200 mm for general, +/- 25.4 mm for special.
Hot Rolled Seamless steel pipe manufacturing process
Hot Rolling Seamless Steel Line Pipe Manufacturing / Production processes
Rolled Round Billets – Examination – Cut Off – Heating – Piercing – Elongation – Slight Tension Reducing – Straightening – Corp End Cutting Off – Visual Inspection – NDT – Hydrostatic Test – Ends Procession – Product Inspection – Painting and Marking – Packing – Warehousing
Cold Drawn (Rolled) seamless steel pipe manufacturing process
Mother pipe (Normally for hot rolled pipe) – Inspection – Annealing – Ends Treatment (Hitting and Drilling hole) – Pickling – Grinding – Phosphorization (Annoit) – Cold Drawn (Rolled) – Degreasing and Cleaning – Heat treatment (Solution treatment) – Straightening – Hydrostatic test – Painting and Marking – Warehousing
