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Introduction
DN is the nominal true diameter in industrial fittings and piping systems and is an important size basis for pipe fittings. DN is often used in American standards to indicate the inner diameter of pipe fittings. Understanding the term DN is very necessary for selecting pipe fittings and accessories in pipe fitting systems. This article will explain DN to some extent.
DN
DN is a nominal true diameter that indicates the inner diameter of a pipe, usually in millimeters. It is also the metric term for nominal pipe size (NPS).
Understanding DN Pipe Sizes
What Does DN Mean in Pipe Size?
DN is the nominal diameter, which is the inner diameter of a pipe in millimeters. For example, DN60 indicates a pipe with an inner diameter of 60 mm. But DN is not only an inner diameter, it can also be used to mark the outer diameter.
What is the Difference Between DN and DIN?
Although DN and DIN are similar, they represent two completely different things. DN is the diameter of the pipe fitting, and DIN is the standard for the pipe fitting.
To simplify
DN: stands for Nominal Diameter (NPS) in the piping system, which is based on metric measurements.
DIN: is one of the pipe fitting standards, referring to the German standard.
How to Read DN Pipe Size Chart?
DN pipe size chart is the inner diameter of the pipe fitting in millimeters, and its outer diameter is usually expressed as OD. Understanding the size expression method will help us better understand the pipe system accessories.
For example, the following DN size chart
| DN | Nominal Pipe Size (NPS) | Outside Diameter (OD) |
| 50 | 2 inches | 2.375 inches (60.33 mm) |
| 100 | 4 inches | 4.500 inches (114.30 mm) |
| 150 | 6 inches | 6.625 inches (168.27 mm) |
What is DN 80 Pipe Size?
DN 80 is a pipe with an inner diameter of 80, which can be a pipe fitting or a steel pipe. Its material can also be carbon steel or stainless steel. Its DN80 outer diameter is usually about 88.90mm.
That is,
DN80=Nominal diameter 80 mm
OD=88.9 mm
DN Pipe Sizes in Inches: Conversion and Understanding
DN needs to be converted to imperial in some cases. Understanding its conversion standard can be more conducive to choosing the right pipe fittings. Here are some conversion examples for reference
| DN (mm) | NPS (inches) |
| 25 | 1 |
| 50 | 2 |
| 80 | 3 |
| 100 | 4 |
| 150 | 6 |
For example:
– **DN 50** is equivalent to **NPS 2**.
– **DN 80** is equivalent to **NPS 3**.
Knowing how to convert can help you choose the right pipe for different measurement standards.
Summary
As long as you are engaged in the industrial piping industry, it is necessary to know DN. It helps you know the size of the pipe and choose the right size for installation. If you have other questions about DN, please consult us. We can also help you convert its size.
