The outer diameter of DN50 refers to the nominal diameter, which is a standardized measurement used in piping systems. It's important to note that DN50 is not the actual outer diameter but rather a designation that represents the size of the pipe or fitting. The actual outer diameter can vary depending on the material and pressure rating, but for standard steel pipes, the outer diameter is typically around 60.3 mm.
DN stands for "Diameter Nominal," and it's a common way to describe the size of pipes and fittings. For example, DN100 means the nominal diameter is 100 mm. However, this does not mean the actual outer diameter is exactly 100 mm. In reality, the outer diameter of a DN100 pipe is often around 114.3 mm, while the inner diameter depends on the wall thickness. This variation exists because the nominal diameter is a rounded value for ease of use in design and manufacturing.
In some corporate standards, the definition of DN may differ slightly. At our company, we define DN as a value that falls between the outer and inner diameters of the pipe. A DN100 pipe is commonly referred to as a "four-inch" pipe, which helps in identifying its size when working with different systems.
Another key point to understand is that DN is not always referring to the pipe itself. In many cases, it refers to flanges that are designed to fit specific pipe sizes. For instance, a DN50 flange is intended for a steel pipe with an outer diameter of 57 mm. Regardless of the wall thickness, the outer diameter remains the same, and the bore (inner diameter) may vary based on the wall thickness.
Here are some examples:
- DN15 flange fits a 18 mm outer diameter pipe
- DN20 flange fits a 25 mm outer diameter pipe
- DN25 flange fits a 32 mm outer diameter pipe
- DN40 flange fits a 45 mm outer diameter pipe
- DN50 flange fits a 57 mm outer diameter pipe
- DN80 flange fits an 89 mm outer diameter pipe
- DN100 flange fits a 109 mm outer diameter pipe
These measurements help ensure proper alignment and sealing when connecting pipes and fittings. Understanding the difference between nominal and actual dimensions is crucial when selecting the right components for your system.
On weekdays, people might refer to these sizes using local terms like "2 muscle thin muscles (18), 7-guns, ping-pumps, S (18), ping-pong, and frequency-reversing." These phrases are informal and often used in conversations among professionals who are familiar with the industry jargon.
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