For DN40 seamless steel pipes, is it possible that the outer diameter is 70, or is there an error in the drawing specifications?
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For DN40 seamless steel pipes, is it possible that the outer diameter is 70, or is there an error in the drawing specifications?
A DN40 seamless steel pipe refers to a pipe with a nominal diameter of 40 millimeters, which generally does not correspond directly to the outer diameter. The outer diameter of a standard DN40 pipe is generally 48.3 millimeters. If the outer diameter is indicated as 70 millimeters on the drawing, it is likely a mistake. .
What 40-inch pipe has a wall thickness of over 15mm?
HGT 20256-2016 General Technical Specifications for Chemical High-Pressure Pipes; the outer diameter of DN40 pipes is available in a 68 mm size.
Seamless pipes with an inner diameter of 40 and an outer diameter of 70 are available, but they probably can’t be denoted using DN
It is possible that the outer diameter is 68, with the measurement error considered to be 70.
In general, for pressure vessels and pressure pipelines that involve steel pipes, the manufacturing standards must be indicated; this is also a requirement. The figure below shows the outer diameters of some pipes from domestic and international sources.
It’s possible; the operating condition is high pressure