Plain Ends SSAW Steel Pipe API 5L for Offshore Platform Structures
SSAW Pipe for Offshore Platform Structures
Specifications
Offshore Spiral Submerged Arc Welded (SSAW) pipe is a large-diameter, high-strength steel pipe manufactured by forming steel coils into a helix and welding the seam using a submerged arc process. It is vital for offshore engineering, serving as critical components for pile legs, risers, and structural foundation supports. These pipes offer high toughness (≥200J) and tensile strength (≥600MPa), enabling them to withstand extreme wave impacts and deep-sea pressures.
| American Standard | Standard Name |
| API 5L | Specification for Line Pipe |
Offshore SSAW Pipe Chemical Composition
Sources American Standard API SPECIFICATION 5L Table 4 — Chemical composition for PSL 1 pipe with t ≤ 25,0 mm (0.984 in)
| Steel Grade | Mass fraction, based on heat and product analyses a,g % |
||||||
| C | Mn | P | S | V | Nb | Ti | |
| max b | max b | max | max | max | max | max | |
| Seamless Pipe | |||||||
| A | 0.22 | 0.9 | 0.03 | 0.03 | – | – | – |
| B | 0.28 | 1.2 | 0.03 | 0.03 | c,d | c,d | d |
| X42 | 0.28 | 1.3 | 0.03 | 0.03 | d | d | d |
| X46 | 0.28 | 1.4 | 0.03 | 0.03 | d | d | d |
| X52 | 0.28 | 1.4 | 0.03 | 0.03 | d | d | d |
| X56 | 0.28 | 1.4 | 0.03 | 0.03 | d | d | d |
| X60 | 0.28 e | 1.40 e | 0.03 | 0.03 | f | f | f |
| X65 | 0.28 e | 1.40 e | 0.03 | 0.03 | f | f | f |
| X70 | 0.28 e | 1.40 e | 0.03 | 0.03 | f | f | f |
| Welded Pipe | |||||||
| A | 0.22 | 0.9 | 0.03 | 0.03 | – | – | – |
| B | 0.26 | 1.2 | 0.03 | 0.03 | c,d | c,d | d |
| X42 | 0.26 | 1.3 | 0.03 | 0.03 | d | d | d |
| X46 | 0.26 | 1.4 | 0.03 | 0.03 | d | d | d |
| X52 | 0.26 | 1.4 | 0.03 | 0.03 | d | d | d |
| X56 | 0.26 | 1.4 | 0.03 | 0.03 | d | d | d |
| X60 | 0.26 e | 1.40 e | 0.03 | 0.03 | f | f | f |
| X65 | 0.26 e | 1.45 e | 0.03 | 0.03 | f | f | f |
| X70 | 0.26e | 1.65 e | 0.03 | 0.03 | f | f | f |
| a. Cu ≤ = 0.50% Ni; ≤ 0.50%; Cr ≤ 0.50%; and Mo ≤ 0.15%, | |||||||
| b. For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum concentration for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; and up to a maximum of 2.00% for grade L485 or X70., | |||||||
| c. Unless otherwise agreed NB + V ≤ 0.06%, | |||||||
| d. Nb + V + TI ≤ 0.15%, | |||||||
| e. Unless otherwise agreed., | |||||||
| f. Unless otherwise agreed, NB + V = Ti ≤ 0.15%, | |||||||
| g. No deliberate addition of B is permitted and the residual B ≤ 0.001% | |||||||
Offshore SSAW Pipe Mechanical Properties
Sources American Standard API SPECIFICATION 5L Table 6 — Requirements for the results of tensile tests for PSL 1 pipe
| Pipe Grade | Pipe Body of SMLS and Welded Pipes | Weld seam of EW,LW,SAW and COW pipes | ||
| Yield Strength a | Tensile Strength a | Elongation | Tensile Strength b | |
| Rt0,5 PSI Min | Rm PSI Min | (in 2in Af % min) | Rm PSI Min | |
| A | 210 (30 500) | 335 (48 600) | c | 335 (48 600) |
| B | 245(35 500) | 415 (60 200) | c | 415 (60 200) |
| X42 | 290 (42 100) | 415 (60 200) | c | 415 (60 200) |
| X46 | 320 (46 400) | 435 (63 100) | c | 435 (63 100) |
| X52 | 360 (52 200) | 460 (66 700) | c | 460 (66 700) |
| X56 | 390 (56 600) | 490 (71 100) | c | 490 (71 100) |
| X60 | 415 (60 200) | 520 (75 400) | c | 520 (75 400) |
| X65 | 450 (65 300) | 535(77 600) | c | 535 (77 600) |
| X70 | 485 (70 300) | 570 (82 700) | c | 570 (82 700) |
| a. For intermediate grade, the difference between the specified minimum tensile strength and the specified minimum yield for the pipe body shall be as given for the next higher grade. | ||||
| b. For the intermediate grades, the specified minimum tensile strength for the weld seam shall be the same as determined for the body using footnote a. | ||||
| c. The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation: | ||||
| * Please refer to the original standard for the formula in the image. | ||||
| Where C is 1 940 for calculation using Si units and 625 000 for calculation using USC units | ||||
| Axc is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches) , as follows | ||||
| – For circular cross-section test pieces, 130mm2 (0.20 in2) for 12.7 mm (0.500 in) and 8.9 mm (.350 in) diameter test pieces; and 65 mm2 (0.10 in2) for 6.4 mm (0.250in) diameter test pieces. | ||||
| – For full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2) | ||||
| – For strip test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2) | ||||
| U is the specified minimum tensile strength, expressed in megapascals (pounds per square inch) | ||||
Offshore SSAW Pipe Manufacturing process
Raw Material Inspection → Strip Joining → Pre-forming Treatment → Conveyor Control → Roll Forming → Gap Control → Welding → NDT (Non-Destructive Testing) → Single Pipe Cutting → Batch Inspection → Defect Repair → Weld Inspection → Hydrostatic Testing → End Finishing
Offshore SSAW Pipe Application
- Submarine Pipeline Systems
- Offshore Platform Structures
- Marine Piling and Foundation Applications
- Riser Systems and Risers
- Offshore Loading and Offloading Systems
- Seawater Intake and Discharge Lines
- Subsea Production Systems
- Offshore Construction and Installation
- Pipeline End Terminations and Tie-Ins
- Offshore Renewable Energy
Offshore SSAW Pipe Packing & Loading
→SSAW Pipe is transported in containers
(Nesting Packaging): Large-diameter SSAW pipes can be nested within one another, similar to Russian dolls, to utilize the internal space of larger pipes and minimize the volume of the cargo. This is a "game-changer" for reducing freight expenses and improving supply chain efficiency.
SSAW Pipe is transported by bulk carrier
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.