Galvanized Iron (GI) Pipe Size Chart — BS 1387 / EN 10255
The following chart is suitable as a general customer reference for common nominal sizes sold in Bangladesh. It uses commonly referenced nominal outside diameters and representative medium-series wall thicknesses. Legacy BS 1387 tables can have different dimensional values, so confirm the precise standard and class printed in each brand’s technical specification.
|
Nominal size (inch) |
DN | OD (mm) | Wall thickness (mm) |
Approx. ID (mm) |
|---|---|---|---|---|
|
¼″ |
8 | 13.5 | 2.3 | 8.9 |
|
⅜″ |
10 | 17.2 | 2.3 |
12.6 |
|
½″ |
15 | 21.3 | 2.6 |
16.1 |
|
¾″ |
20 | 26.9 | 2.6 | 21.7 |
| 1″ | 25 | 33.7 | 3.2 |
27.3 |
|
1¼″ |
32 | 42.4 | 3.2 | 36.0 |
| 1½″ | 40 | 48.3 | 3.2 |
41.9 |
|
2″ |
50 | 60.3 | 3.6 | 53.1 |
| 2½″ | 65 | 76.1 | 3.6 |
68.9 |
|
3″ |
80 | 88.9 | 4.0 | 80.9 |
| 4″ | 100 | 114.3 | 4.5 |
105.3 |
|
5″ |
125 | 139.7 | 5.0 | 129.7 |
| 6″ | 150 | 165.1 | 5.0 |
155.1 |
Galvanized Iron (GI) Pipe Pressure Rating
The pressure rating of Galvanized Iron (GI) pipes depends on nominal pipe size, wall thickness, pipe class, material properties, jointing method and operating conditions. Maximum allowable working pressure may vary by manufacturer and product specification. Please refer to the manufacturer’s technical datasheet for the applicable working-pressure limits before installation.
Galvanized Iron (GI) Pipe Temperature Rating
The temperature suitability of Galvanized Iron (GI) pipes depends on the pipe specification, operating pressure, zinc coating, conveyed fluid and service conditions. Temperature limits may vary by manufacturer and application. Please consult the manufacturer’s technical datasheet to confirm the recommended operating temperature and ensure safe, reliable performance.
