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PIPE SIZE TO OUTSIDE DIAMETER CHART

NOMINAL PIPE SIZE TO OUTSIDE DIAMETER CONVERSION


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.

WHAT DOES NOMINAL PIPE SIZE MEAN?   The Nominal Pipe Size was originally created to identify the ID (inner diameter) of the pipe. With the creation of different types of pipe schedules (40, 80, etc) with varying wall thicknesses, the standard kept the OD (outside diameter) of the pipes the same while they adjusted the ID of the pipes.

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

COPPER PIPES

COPPER TUBE SIZE OUTSIDE DIAMETER OF PIPE (INCHES)
1/2       (Order 5/8) .66"
3/4       (Order 1/2) .92"
1          (Order 3/4) 1.16"
1-1/4    (Order 1) 1.41"
1-1/2    (Order 1-1/4) 1.72"
2          (Order 2-1/8) 2.16"
2-1/2    (Order 2-5/8) 2.66"
3          (Order 3-1/8) 3.16"
3-1/2    (Order 3) 3.66"
4          (Order 4-1/8) 4.16"
5          (Order 5-1/8) 5.16"
6          (Order 6-1/8) 6.16"

 

*If you have any questions or concerns about what size to order, please don't hesitate to contact us.

CLICK HERE FOR OUR HOW TO USE A PIPE CALIPER GUIDE - Highly Recommended