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Frequently Asked Questions
Q
What outer diameter sizes are available according to this specification table?
A
The specification table covers outer diameters ranging from 200 mm to 1000 mm, including sizes 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, and 1000 mm to accommodate a wide range of industrial applications.
Q
How does the outer diameter tolerance change as the pipe size increases?
A
The outer diameter tolerance increases progressively with pipe size. For example, a 200 mm pipe has a tolerance of ±2.0～±3.0 mm, while a 1000 mm pipe has a wider tolerance of ±12.0～±15.0 mm, reflecting the greater manufacturing challenges associated with larger diameter pipes.
Q
What is the standard wall thickness range for a 500 mm outer diameter pipe?
A
For a pipe with a 500 mm outer diameter, the standard wall thickness ranges from 12 mm to 25 mm, with a corresponding wall thickness tolerance of ±1.5～±2.5 mm.
Q
Why does the standard length decrease for larger diameter pipes?
A
Larger diameter pipes (700 mm and above) have a reduced maximum standard length — 1000～1800 mm for 700–800 mm and 1000～1500 mm for 900–1000 mm — primarily due to the increased weight and the structural requirements needed to maintain dimensional stability during manufacturing, transport, and installation.
Q
Can custom wall thicknesses outside the listed standard range be ordered?
A
The table reflects standard wall thickness ranges for each diameter. Custom wall thicknesses outside these ranges may be available depending on specific project requirements and manufacturing capabilities. It is recommended to contact the supplier directly to discuss non-standard specifications.
Q
What do the wall thickness tolerances indicate, and why are they important?
A
Wall thickness tolerances define the acceptable deviation from the nominal wall thickness during production. They are critical for ensuring structural integrity, pressure resistance, and consistent performance in service. Tighter tolerances are typically required for high-pressure or precision applications, while broader tolerances may be acceptable for general-purpose use.
