DN50 refers to the nominal diameter, not the actual outer diameter. The actual outer diameter of a DN50 pipe can vary depending on the standard and material, but it's commonly around 60.3 mm for steel pipes. The term "nominal diameter" is used as a reference size, which simplifies the identification and compatibility of piping components like flanges, valves, and fittings.
For example, DN100 does not mean that the pipe has an outer diameter of exactly 100 mm. In practice, the outer diameter of a DN100 steel pipe is typically around 114.3 mm, while the inner diameter may be approximately 95 mm, depending on the wall thickness. However, in some corporate or regional standards, the definition of DN might differ slightly, so it's always best to check the specific standard being used.
In our company, DN is defined as a nominal value that falls between the outer and inner diameters. This helps in ensuring proper fitting and connection of different pipe components. DN100 is also commonly referred to as a "four-inch" pipe, though this is more of a traditional or industry shorthand rather than an exact measurement.
Another important point is that DN sizes are standardized and rounded for ease of use. For instance, a DN50 flange is designed to fit with a pipe that has an outer diameter of 57 mm, regardless of the wall thickness. This means that even if the wall thickness changes, the outer diameter remains consistent at 57 mm, and the bore (inner diameter) will vary accordingly.
Here are some common examples:
- DN15: 18 mm outer diameter
- DN20: 25 mm outer diameter
- DN25: 32 mm outer diameter
- DN40: 45 mm outer diameter
- DN50: 57 mm outer diameter
- DN80: 89 mm outer diameter
- DN100: 109 mm outer diameter
These measurements are standardized for flanges and other pipe fittings to ensure compatibility across different systems and manufacturers.
It's worth noting that the term "DN" is widely used in international standards such as ISO and EN, whereas "NPS" (Nominal Pipe Size) is more common in the U.S. system. Understanding these differences is crucial when working with global projects or suppliers.
In everyday language, people often refer to these sizes using terms like "2 muscle thin muscles (18)" or "7-guns," which are informal expressions used in certain regions to describe the size of pipes or fittings. These terms may not be standard but are still understood within specific industries or communities.
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