On Buy Insulation Products.com, all of our Fiberglass Pipe Insulation is sold by Nominal Pipe Size (NPS) and this can be confusing if the nominal pipe size is not known or displayed on the pipe in question.
The table below will show the Outside Diameter in inches for each Nominal Pipe Size. For Copper pipes, the pipe sizes to order are in parentheses.
PIPES OTHER THAN COPPER PIPES
| NOMINAL PIPE SIZE |
OUTSIDE DIAMETER OF PIPE (INCHES) |
| 1/2 |
.840" |
| 3/4 |
1.05" |
| 1 |
1.315" |
| 1-1/4 |
1.66" |
| 1-1/2 |
1.9" |
| 2 |
2.375" |
| 2-1/2 |
2.875" |
| 3 |
3.5" |
| 3-1/2 (Order 4-1/8 on our site) |
4" |
| 4 |
4.5" |
| 4-1/2 (Order 5-1/8 on our site) |
5" |
| 5 |
5.563" |
| 6 |
6.625" |
| 7 |
7.625" |
| 8 |
8.625" |
| 9 |
9.625" |
| 10 |
10.75" |
| 11 |
11.75" |
| 12 |
12.75" |
| NPS = Outside Diameter from NPS 14 to 30 |
|
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