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High-Temperature Oversized Fused Quartz Tube from China Suppliers - Factory Quality for Industrial Applications
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Outer Diameter (mm) |
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OD Tolerance (mm) |
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Wall Thickness (mm) |
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Wall Thickness Tol. (mm) |
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Standard Length (mm) |
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| 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
Q1.What does "Outer Diameter Tolerance" mean in this specification table?
Outer Diameter Tolerance refers to the permissible deviation from the nominal outer diameter during manufacturing. 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 quality standards.
Q2.Why does the standard length decrease for larger diameter pipes (e.g., 900 mm and 1000 mm)?
Larger diameter pipes are significantly heavier and more difficult to handle, transport, and install. Reducing the standard length (to 1000～1500 mm for pipes ≥900 mm OD) helps manage weight per section, ensures safer logistics, and makes on-site installation more practical without specialized heavy-lift equipment.
Q3.Can pipes be ordered in custom lengths outside the standard length range?
Yes, custom lengths can typically be arranged upon request. The standard length ranges listed in the table represent the most common production sizes. For project-specific requirements, it is recommended to contact the manufacturer directly to confirm feasibility, lead times, and any additional costs for non-standard lengths.
Q4.How should I select the appropriate wall thickness for my application?
Wall thickness selection depends on several factors including operating pressure, fluid type, temperature, soil load (for buried pipes), and applicable design codes. The table provides a range of standard wall thicknesses for each outer diameter. A structural or piping engineer should be consulted to determine the minimum required wall thickness based on your specific service conditions.
Q5.What standards or certifications govern the tolerances listed in this table?
The dimensional tolerances in this table are typically aligned with international manufacturing standards such as ISO, ASTM, EN, or GB (Chinese National Standard), depending on the material and intended application. Buyers should verify which specific standard applies to their order and request mill test certificates or inspection reports to confirm compliance.
Q6.Are wall thickness tolerances the same across all sizes, or do they vary?
Wall thickness tolerances increase proportionally with pipe size. Smaller pipes (e.g., 200 mm OD) have tighter tolerances of ±0.8～±1.2 mm, while larger pipes (e.g., 1000 mm OD) allow for ±3.0～±5.0 mm. This reflects the greater manufacturing complexity and material variability inherent in producing larger-diameter pipes, and is consistent with standard industry practice.