The main difference between Schedule 10 and Schedule 40 pipe is the wall thickness, which affects strength, pressure rating, and weight. Both use the same Nominal Pipe Size (NPS), but:
1. Wall Thickness
|
NPS |
Schedule 10 |
Schedule 40 |
|
1" |
2.77 mm |
3.38 mm |
|
2" |
2.77 mm |
3.91 mm |
|
4" |
3.05 mm |
6.02 mm |
|
6" |
3.40 mm |
7.11 mm |
Schedule 40 has a thicker wall than Schedule 10 for the same pipe size.
2. Pressure Rating
Schedule 40 handles higher pressure due to its thicker wall.
Schedule 10 is lighter and lower-pressure rated.
(Exact pressure rating depends on pipe material and temperature.)
3. Weight
Schedule 10 is lighter — easier to handle, cheaper to install.
Schedule 40 is heavier, adding durability but more structural weight.
4. Common Uses
|
Schedule 10 |
Schedule 40 |
|
Low-pressure systems |
Medium to high-pressure systems |
|
HVAC, drain lines, exhausts |
Water, gas, oil pipelines |
|
Stainless steel process piping |
Structural and industrial piping |
|
Non-critical applications |
Pressure-critical installations |
5. Cost
Schedule 10 is generally less expensive due to less material.
Schedule 40 costs more, but gives higher mechanical strength.
