There is no single wall thickness for API 5L X52 pipe. The grade "X52" refers only to the strength of the steel (Yield Strength of 52,200 psi), not its dimensions.
The wall thickness is determined by the Nominal Pipe Size (NPS) and the Schedule (Sch). API 5L follows the dimensional standards set by ASME B36.10M.
Are you selecting API 5L X52 pipes for your project? Share your specific requirements with us, and-based on your operating conditions-we will recommend the product with the most suitable wall thickness to help ensure the smooth progress of your project!
API 5L X52 Seamless Pipe Wall Thickness Table (ASME B36.10M)
X52 seamless pipes are commonly used in medium to high-pressure environments. Below are the most common schedules used in the industry (Units: mm):
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Sch 40 (STD) | Sch 80 (XS) | Sch 120 | Sch 160 | XXS |
| 2" | 60.3 mm | 3.91 | 5.54 | 6.35 | 8.74 | 11.07 |
| 3" | 88.9 mm | 5.49 | 7.62 | 8.89 | 11.13 | 15.24 |
| 4" | 114.3 mm | 6.02 | 8.56 | 11.13 | 13.49 | 17.12 |
| 6" | 168.3 mm | 7.11 | 10.97 | 14.27 | 18.26 | 21.95 |
| 8" | 219.1 mm | 8.18 | 12.70 | 18.26 | 23.01 | 22.23 |
| 10" | 273.1 mm | 9.27 | 15.09 | 21.44 | 28.58 | 25.40 |
| 12" | 323.9 mm | 10.31 | 17.48 | 25.40 | 33.32 | 25.40 |
| 14" | 355.6 mm | 11.13 | 19.05 | 27.79 | 35.71 | - |
| 16" | 406.4 mm | 12.70 | 21.44 | 30.96 | 40.49 | - |
| 24" | 610.0 mm | 17.48 | 30.96 | 46.02 | 59.54 | - |
Wall Thickness Tolerance for SMLS Pipe (API 5L)
Tolerances for seamless pipes are generally broader than for welded pipes due to the manufacturing process (extrusion/piercing).
| Wall Thickness (t) | Minus Tolerance | Plus Tolerance |
|
t≤4.0 mm |
-0.5 mm | +0.6 mm |
|
4.0<t<25.0 mm |
-12.5% | +15.0% |
|
t≥25.0 mm |
-3.0 mm | +3.75 mm |
Note: For specific project requirements, tighter tolerances (e.g.,±10% ) can be negotiated between the manufacturer and the purchaser.
API 5L X52 Welded Pipe Wall Thickness Table (ASME B36.10M)
Welded pipes are frequently used for large-diameter long-distance pipelines. Below are common specifications (Units: mm):
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Sch 10 | Sch 20 | Sch 30 | Sch 40 (STD) | Sch 80 (XS) |
| 6" | 168.3 mm | 3.40 | - | - | 7.11 | 10.97 |
| 8" | 219.1 mm | 3.76 | 6.35 | 7.04 | 8.18 | 12.70 |
| 12" | 323.9 mm | 4.57 | 6.35 | 8.38 | 10.31 | 12.70 |
| 16" | 406.4 mm | 4.78 | 7.92 | 9.53 | 12.70 | 12.70 |
| 20" | 508.0 mm | 6.35 | 9.53 | 12.70 | 12.70 | 12.70 |
| 24" | 610.0 mm | 6.35 | 9.53 | 12.70 | 12.70 | 12.70 |
| 30" | 762.0 mm | 7.92 | 12.70 | 12.70 | 12.70 | 12.70 |
| 36" | 914.0 mm | 7.92 | 12.70 | 12.70 | 12.70 | 12.70 |
| 48" | 1219.0 mm | 9.53 | 12.70 | 12.70 | 12.70 | 12.70 |
Wall Thickness Tolerance for Welded Pipe (API 5L Table 11)
The tolerances for welded pipes are typically expressed as a percentage of the nominal thickness or a fixed value.
| Wall Thickness (t) | Tolerance |
|
t≤5.0 mm |
±0.5 mm |
|
5.0<t<15.0 mm |
±10%×t |
|
t≥15.0 mm |
±1.5 mm |
API 5L X52 High Yield Line Pipes Guide Table
| Application | Recommended Wall Thickness | Core Selection Logic |
| Low-Pressure Water | Sch 10 / Sch 20 | Focus on cost and structural rigidity. |
| Gas Distribution | Sch 40 / STD | Focus on safety factors for populated areas. |
| Oil Transmission | Sch 40 / Sch 80 | Balancing pressure containment and weight reduction. |
| Main Gas Pipelines | Sch 80 / XS | High energy storage; requires PSL2 and heavy walls. |
| Station Piping | Sch 120 / 160 / XXS | High vibration and turbulence; requires erosion resistance. |
| HDD / Crossing | Heavy Wall (+3-6mm) | Resisting high tensile stress during pipe pulling. |
| Subsea Pipelines | Custom Heavy Wall | Resisting external hydrostatic collapse pressure. |
API 5L X52 Oil and Gas pipe factory
API 5L X52 pipeline for oil and gas test equipments
API 5L X52 Line Pipes for oil & gas Certificate
FAQ
What is API 5L X52 equivalent to?
In international standards, the steel grade corresponding to API 5L X52 is L360; as both share identical yield strength requirements (≥360 MPa), they serve as globally recognized equivalent designations.
What is the pressure rating of API 5L X52 pipe?
The pressure-bearing capacity of API 5L X52 steel pipe depends on its outer diameter and wall thickness; the standard itself does not directly specify specific pressure values. According to the API 5L specification, the minimum yield strength of X52 steel pipe is 360 MPa (approximately 52,220 psi); utilizing this parameter in conjunction with the specific dimensions, its theoretical internal pressure strength can be calculated using Barlow's Formula.
