1-1/2 inch pipe dimensions: OD and wall thickness by schedule
Deskely Completions team Singapore
A 1-1/2 inch pipe, NPS 1-1/2 or DN 40, has an outside diameter of 48.3 mm (1.900 inches) in every schedule. The nominal size is a name, not a measurement: the outside diameter is larger than 1-1/2 inch. The schedule sets the wall thickness, and with it the inside diameter and the weight.
The table gives every schedule listed for NPS 1-1/2 in ASME B36.10M and B36.19M, in mm and inches.
- Outside diameter: 48.3 mm (1.900 in), the same for every schedule.
- Schedule 40: 3.68 mm wall, 40.9 mm inside diameter.
- Schedule 80: 5.08 mm wall, 38.1 mm inside diameter.
- Metric equivalent: DN 40.
1-1/2 inch pipe dimensions by schedule
| Schedule | Wall mm (in) | ID mm (in) | kg/m (lb/ft) |
|---|---|---|---|
| Schedule 5S | 1.65 (0.065) | 45.00 (1.772) | 1.90 (1.28) |
| Schedule 10S | 2.77 (0.109) | 42.76 (1.683) | 3.11 (2.09) |
| Schedule 10 | 2.77 (0.109) | 42.76 (1.683) | 3.11 (2.09) |
| Schedule 30 | 3.18 (0.125) | 41.94 (1.651) | 3.54 (2.38) |
| STD (standard) | 3.68 (0.145) | 40.94 (1.612) | 4.05 (2.72) |
| Schedule 40 | 3.68 (0.145) | 40.94 (1.612) | 4.05 (2.72) |
| XS (extra strong) | 5.08 (0.200) | 38.14 (1.502) | 5.41 (3.64) |
| Schedule 80 | 5.08 (0.200) | 38.14 (1.502) | 5.41 (3.64) |
| Schedule 160 | 7.14 (0.281) | 34.02 (1.339) | 7.25 (4.87) |
| XXS (double extra strong) | 10.15 (0.400) | 28.00 (1.102) | 9.55 (6.42) |
Nominal dimensions. Weights are for plain-end carbon steel; stainless steel is about 2 percent heavier. Mill tolerances apply, and your project pipe specification takes precedence.
1-1/2 inch pipe outside diameter
The outside diameter of NPS 1-1/2 pipe is 48.3 mm, or 1.900 inches, whatever the schedule, so 1-1/2 inch fittings and flanges fit every wall thickness. In metric drawings and specifications the same size is called DN 40.
It is larger than 1-1/2 inch because, below NPS 14, the nominal size is a traditional name that once roughly matched the bore, not the outside.
Nearby sizes
- 1-1/4 inch pipe dimensions: OD 42.2 mm
- 2 inch pipe dimensions: OD 60.3 mm
Every size and schedule in one table: the pipe schedule chart.
The Deskely products for this
Frequently asked questions
What is the OD of 1-1/2 inch pipe?
48.3 mm (1.900 inches), the same for every schedule.
What is the wall thickness of 1-1/2 inch schedule 40 pipe?
3.68 mm (0.145 in), giving an inside diameter of 40.9 mm (1.612 in).
What is the wall thickness of 1-1/2 inch schedule 80 pipe?
5.08 mm (0.200 in), giving an inside diameter of 38.1 mm (1.502 in).
What is 1-1/2 inch pipe in DN?
DN 40.
How much does 1-1/2 inch schedule 40 pipe weigh?
4.05 kg/m (2.72 lb/ft) for plain-end carbon steel.
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