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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 |
What outer diameter sizes are available according to this specification table?
The specification table covers outer diameters ranging from 200 mm up to 1000 mm, providing a wide selection to suit various industrial and structural applications.
How does wall thickness change as the outer diameter increases?
As the outer diameter increases, the standard wall thickness range also increases proportionally. For example, a 200 mm diameter pipe has a wall thickness of 6–12 mm, while a 1000 mm diameter pipe requires 25–45 mm, ensuring adequate structural integrity at larger sizes.
What is the standard length range for these pipes, and does it vary by size?
Most sizes (200–600 mm outer diameter) are available in standard lengths of 1000–2000 mm. Larger diameters (700–800 mm) are limited to 1000–1800 mm, and the largest sizes (900–1000 mm) are available in 1000–1500 mm lengths, reflecting manufacturing and handling constraints.
Why do outer diameter tolerances increase with larger pipe sizes?
Larger pipes are more challenging to manufacture with tight precision due to the greater material volume and thermal effects during production. As a result, tolerance ranges widen with increasing diameter — from ±2.0～±3.0 mm at 200 mm up to ±12.0～±15.0 mm at 1000 mm — while still meeting industry standards.
Can custom wall thicknesses outside the listed ranges be ordered?
The table lists standard wall thickness ranges for each diameter. Custom thicknesses beyond these ranges may be available depending on specific project requirements and material capabilities. It is recommended to consult with the manufacturer directly for non-standard specifications.
What do the wall thickness tolerances indicate, and why are they important?
Wall thickness tolerances define the acceptable variation from the nominal wall thickness during production. They are critical for ensuring consistent pressure resistance, structural performance, and compatibility with fittings or installation systems. Tighter tolerances are applied to smaller pipes, while larger pipes carry slightly wider tolerance bands.
