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| Outer Diameter (mm) | Outer Diameter Tolerance (mm) | Standard Wall Thickness (mm) | Wall Thickness Tolerance (mm) | Standard Length (mm) |
|---|---|---|---|---|
| 200 | ±2.0～±3.0 | 6～12 | ±0.8～±1.2 | 1000～2000 |
| 250 | ±2.5～±3.5 | 8～14 | ±1.0～±1.5 | 1000～2000 |
| 300 | ±3.0～±4.0 | 8～16 | ±1.0～±1.5 | 1000～2000 |
| 350 | ±3.5～±4.5 | 10～18 | ±1.2～±1.8 | 1000～2000 |
| 400 | ±4.0～±5.0 | 10～20 | ±1.2～±2.0 | 1000～2000 |
| 450 | ±4.5～±5.5 | 12～22 | ±1.5～±2.0 | 1000～2000 |
| 500 | ±5.0～±6.0 | 12～25 | ±1.5～±2.5 | 1000～2000 |
| 600 | ±6.0～±8.0 | 15～28 | ±2.0～±3.0 | 1000～2000 |
| 700 | ±7.0～±9.0 | 18～32 | ±2.0～±3.0 | 1000～1800 |
| 800 | ±8.0～±10.0 | 20～35 | ±2.5～±3.5 | 1000～1800 |
| 900 | ±10.0～±12.0 | 22～40 | ±3.0～±4.0 | 1000～1500 |
| 1000 | ±12.0～±15.0 | 25～45 | ±3.0～±5.0 | 1000～1500 |
All dimensions are in millimeters (mm). Tolerances may vary based on material grade and production method.
Frequently Asked Questions
Q
What is the available outer diameter range for these pipes?
The outer diameter range covered in this specification is from 200 mm to 1000 mm, offering a wide selection to suit various industrial, structural, and infrastructure applications.
Q
Why do the outer diameter tolerances increase as the pipe size gets larger?
Larger diameter pipes are more challenging to manufacture with tight precision due to increased material mass and thermal expansion during production. As a result, tolerance ranges are proportionally wider for larger diameters to accommodate practical manufacturing limitations while still ensuring structural integrity.
Q
What is the standard length for pipes with an outer diameter of 700 mm and above?
For pipes with an outer diameter of 700 mm and 800 mm, the standard length range is 1000～1800 mm. For pipes with an outer diameter of 900 mm and 1000 mm, the standard length is reduced to 1000～1500 mm, reflecting the greater weight and handling requirements of large-diameter pipes.
Q
Can custom wall thicknesses be produced outside the standard ranges listed?
Yes, custom wall thicknesses outside the listed standard ranges can typically be produced upon request. The standard ranges provided represent the most commonly stocked and cost-effective options, but specific project requirements may be accommodated through special orders with adjusted lead times and pricing.
Q
How are wall thickness tolerances determined for each pipe size?
Wall thickness tolerances are determined based on the pipe's outer diameter and the corresponding wall thickness range. Larger and thicker pipes require wider tolerance bands due to the increased complexity of maintaining uniform wall thickness across the full circumference during the manufacturing process.
Q
Are these specifications compliant with international standards?
The dimensional specifications listed are designed to align with common international manufacturing standards for large-diameter pipes. For project-specific compliance requirements, such as ASTM, EN, or ISO standards, please consult with our technical team to confirm the applicable standard and any additional certification needs.