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⌀
Outer Diameter (mm) |
↔
OD Tolerance (mm) |
▣
Wall Thickness (mm) |
±
WT 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 in millimeters (mm)
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Frequently Asked Questions
Q
What does the outer diameter tolerance mean in this specification table?
The outer diameter (OD) tolerance refers to the permissible deviation from the nominal outer diameter during manufacturing. For example, a pipe with an OD of 200 mm may have an actual OD ranging within ±2.0 to ±3.0 mm, ensuring it still fits standard fittings and connections.
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 manage structural integrity and logistical challenges, the standard length is reduced — from up to 2000 mm for smaller diameters to 1500 mm or 1800 mm for larger ones.
Q
Can I order pipes with custom wall thickness outside the standard range?
Yes, custom wall thickness options are typically available upon request. The standard wall thickness ranges listed in the table represent the most commonly used specifications. Please contact our technical team to discuss custom requirements based on your specific application and pressure rating needs.
Q
How is wall thickness tolerance controlled during production?
Wall thickness tolerance is maintained through precision casting and machining processes, combined with strict quality control inspections using ultrasonic testing and dimensional gauging. The tolerance values listed ensure consistent performance under rated pressure and load conditions.
Q
Are these specifications compliant with international standards?
The dimensional specifications in this table are designed to align with widely recognized international standards such as ISO, EN, and ASTM guidelines for large-diameter pipes. Specific compliance documentation and material certifications can be provided upon request.
Q
What applications are these large-diameter pipes typically used for?
Pipes in the 200 mm to 1000 mm outer diameter range are commonly used in industrial pipeline systems, municipal water and sewage infrastructure, oil and gas transmission, chemical processing plants, and structural engineering applications where high load-bearing capacity and dimensional precision are critical.