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Outer Diameter (mm) |
↔
OD Tolerance (mm) |
▬
Std. 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 |
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Frequently Asked Questions
Q
What does "Outer Diameter Tolerance" mean in this specification table?
✔
Outer Diameter Tolerance refers to the permissible deviation from the nominal outer diameter of the pipe. For example, a pipe with an outer diameter of 200 mm may have a tolerance of ±2.0 to ±3.0 mm, meaning the actual diameter can range from 197 mm to 203 mm within acceptable limits.
Q
Why does the standard length decrease for larger diameter pipes?
✔
Larger diameter pipes (700 mm and above) are heavier and more difficult to handle, transport, and install. To ensure safety and manageability, the standard length is reduced — for instance, pipes with diameters of 900 mm and 1000 mm have a maximum standard length of 1500 mm.
Q
Can pipes be manufactured in custom lengths outside the standard range?
✔
Yes, custom lengths can typically be produced upon request depending on the manufacturer's capabilities. The standard length ranges listed in the table represent the most commonly stocked and produced sizes, but special orders are often accommodated for specific project requirements.
Q
How do I select the appropriate wall thickness for my application?
✔
Wall thickness selection depends on factors such as operating pressure, fluid type, temperature, and the material's structural requirements. The table provides a range of standard wall thicknesses for each outer diameter. Consulting with an engineer or referring to relevant industry standards is recommended to determine the optimal thickness for your specific application.
Q
What is the significance of Wall Thickness Tolerance in pipe specifications?
✔
Wall Thickness Tolerance defines the allowable variation in the pipe wall thickness during manufacturing. Tighter tolerances ensure more consistent performance and structural integrity, which is especially critical in high-pressure or precision applications. As pipe diameter increases, the tolerance range also increases to account for manufacturing complexity.
Q
Are these specifications compliant with international standards?
✔
The dimensional specifications and tolerances listed in this table are designed to align with commonly referenced international standards for pipe manufacturing. However, specific compliance should be verified against the applicable standard for your region or industry, such as ISO, ASTM, EN, or GB standards, depending on your project requirements.