Dn500什麼意思

"DN500" is a designation used in engineering and construction, particularly in the context of pipes and fittings. The term "DN" stands for "diameter nominal" or "nominal diameter," and the number that follows (500 in this case) indicates the size of the pipe or fitting in millimeters.

The nominal diameter is a standard size for pipes and fittings that is used for identification and selection purposes. It is not the actual outside diameter (O.D.) of the pipe, but rather a value that corresponds to a specific pipe size within a system. The actual outside diameter of a DN500 pipe will depend on the pipe's material and the standard to which it is manufactured.

For example, in the European system (which is also used in many other countries), DN500 typically refers to a pipe or fitting with a nominal diameter of 500 millimeters. However, the actual outside diameter might be slightly larger or smaller, depending on the pipe's thickness (wall thickness) and the standard it conforms to, such as DIN, EN, or ISO standards.

It's important to note that the term "DN" and the corresponding number are used differently in various parts of the world, and the actual dimensions can vary. Therefore, it's always best to refer to the specific standard or specifications for the material in question to determine the exact dimensions and tolerances of a DN500 pipe or fitting.