It’s important to note that pipe dimensions can vary based on specific standards and regulations. The American ANSI/ASME standards and the European ISO standards outline the requirements for pipe sizing and provide guidelines for manufacturers and users.
| NPS (Nominal Pipe Size - in Inches) | DN (Nominal Diameter - in Milimeters) |
|---|---|
| 1/8" | 6 |
| 1/4" | 8 |
| 3/8" | 10 |
| 1/2" | 15 |
| 3/4" | 20 |
| 1" | 25 |
| 1 1/4" | 32 |
| 1 1/2" | 40 |
| 2" | 50 |
| 2 1/2" | 65 |
| 3" | 80 |
| 3 1/2" | 90 |
| 4" | 100 |
| 5" | 125 |
| 6" | 150 |
| 8" | 200 |
| 10" | 250 |
| 12" | 300 |
| 14" | 350 |
| 16" | 400 |
| 18" | 450 |
| 20" | 500 |
| 24" | 600 |
| 30" | 750 |
| 36" | 900 |
| 42" | 1050 |
| 48" | 1200 |
| 54" | 1350 |
| 60" | 1500 |
| 66" | 1650 |
| 72" | 1800 |
Nominal Pipe Size (NPS)
In the American industrial market, the sizing system known as Nominal Pipe Size (NPS) is widely used. NPS is defined by the American standard ANSI/ASME and is based on inches. It represents the approximate external diameter of a pipe. NPS values are often expressed as fractions or decimals (e.g., 1/2″, 2.5″).
NPS is primarily used in the United States, where it serves as a standard for specifying pipe sizes in various industries. The American standards provide guidelines for construction, design, and maintenance of piping systems, ensuring compatibility and uniformity within the industry.
Nominal Diameter (DN)
In the European industrial market, the sizing system known as Nominal Diameter (DN) is commonly used. DN is defined by the European standard ISO 6708 and is based on millimeters. It represents the approximate internal diameter of a pipe. DN values are typically expressed as whole numbers (e.g., DN 50).
DN is widely adopted in many countries outside of the United States as the standard measurement system for pipes and related components. The European standards provide specifications for various aspects of piping systems, including dimensions, materials, and testing procedures. These standards ensure consistency and compatibility across different manufacturers and facilitate international trade.
