Piping Systems and Applications! - Resources, Tools and Basic Information for Engineering and Design.
The size of pipes, fittings, flanges and valves are often given in inches as NPS - Nominal Pipe Size, or in metric units as DN - "Diametre Nominel"
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Pipe is a ubiquitous product in the construction industry. It is made of a wide variety of materials - galvanized steel, black steel, copper, cast iron, concrete, and various plastics such as ABS, PVC, CPVC, polyethylene, and polybutylene, among others.
Pipes is identified by "nominal" or "trade" names that are loosely related to actual dimensions. For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and an outside diameter of about 2 5/8 inches. It is called "2-inch pipe" only for the sake of convenience.
There are the inch pound names for pipe products called NPS or "nominal pipe size" and their metric equivalents called DN or "diametre nominel". The metric designations conform to International Standards Organization (ISO) usage and apply to all plumbing, natural gas, heating oil, and miscellaneous piping used in buildings.
| Diameter
Nominal
- DN - (mm) |
Nominal
Pipe Size
- NPS - (inches) |
| 6 | 1/8 |
| 8 | ¼ |
| 10 | 3/8 |
| 15 | ½ |
| 20 | ¾ |
| 25 | 1 |
| 32 | 1 ¼ |
| 40 | 1 ½ |
| 50 | 2 |
| 65 | 2 ½ |
| 80 | 3 |
| 100 | 4 |
| 150 | 6 |
| 200 | 8 |
| 250 | 10 |
| 300 | 12 |
| 350 | 14 |
| 400 | 16 |
| 450 | 18 |
| 500 | 20 |
| 550 | 22 |
| 600 | 24 |
| 650 | 26 |
| 700 | 28 |
| 750 | 30 |
| 800 | 32 |
| 900 | 36 |
| 1000 | 40 |
| 1100 | 42 |
| 1200 | 48 |
| 1400 | 54 |
| 1500 | 60 |
| 1600 | 64 |
| 1800 | 72 |
| 2000 | 80 |
| 2200 | 88 |
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