Schedule 40 is a medium-pressure pipe, adapted to medium pressure scenarios, and is the most widely used. , its dimensions include but are not limited to the outer diameter (O.D.), inner diameter (I.D.), wall thickness and mass per foot of pipe. Together, these parameters affect the physical properties of pipes and their performance in practical applications.
Schedule 40 Pipe
| Nominal Diameter (DN) | NPS | O.D. (mm) | W.T.(mm) | Weight (kg/m) |
| DN15 | 1/2″ | 21.3 | 2.77 | 1.26 |
| DN20 | 3/4″ | 26.7 | 2.87 | 1.63 |
| DN25 | 1″ | 33.4 | 3.38 | 2.42 |
| DN32 | 1 1/4 | 42.2 | 3.56 | 3.27 |
| DN40 | 1 1/2 | 48.3 | 3.68 | 3.85 |
| DN50 | 2″ | 60.3 | 3.91 | 4.88 |
| DN65 | 2 1/2 | 73 | 5.16 | 7.01 |
| DN80 | 3″ | 88.9 | 5.49 | 8.38 |
| DN100 | 4″ | 114.3 | 6.02 | 10.26 |
| DN150 | 6″ | 168.3 | 7.11 | 14.27 |
| DN200 | 8″ | 219.1 | 8.18 | 20.63 |
| DN300 | 12″ | 323.9 | 9.27 | 28.58 |
1. How Thick is Schedule 40 Pipe
The following is the schedule 40 pipe dimensions chart, The table presents the outside diameter, wall thickness and weight of schedule 40 pipe sizes 1/8“ to 24” nominal diameter. This table is for carbon steel pipe only. It includes the main dimensions of Schedule 40, pipe O.D., and wall thickness. If you have any questions you can contact us.
1 inch 2 = 645.2 mm 2 = 6.452 cm 2 = 6.452 x 10-4 m 2
1 foot (ft) = 0.3048 m
Schedule 40 Pipe Thickness
| schedule 40 OD [in inches] | schedule 40 O.D.[in mm] | schedule 40 thickness [in inches] | schedule 40 Wall thickness [in mm] | |
| 1/8 | 0.405 | 10.3 | 0.068 | 1.73 |
| 1/4 | 0.54 | 13.7 | 0.088 | 2.24 |
| 1/2 | 0.84 | 21.3 | 0.109 | 2.77 |
| 3/4 | 1.05 | 26.7 | 0.113 | 2.87 |
| 1 | 1.315 | 33.4 | 0.133 | 3.38 |
| 1.25 | 1.66 | 42.2 | 0.14 | 3.56 |
| 1.5 | 1.9 | 48.3 | 0.145 | 3.68 |
| 2 | 2.375 | 60.3 | 0.154 | 3.91 |
| 2.5 | 2.875 | 73 | 0.203 | 5.16 |
| 3 | 3.5 | 88.9 | 0.216 | 5.49 |
| 3.5 | 4 | 101.6 | 0.226 | 5.74 |
| 4 | 4.5 | 114.3 | 0.237 | 6.02 |
| 5 | 5.563 | 141.3 | 0.258 | 6.55 |
| 6 | 6.625 | 168.3 | 0.28 | 7.11 |
| 8 | 8.625 | 219.1 | 0.322 | 8.18 |
| 10 | 10.75 | 273 | 0.365 | 9.27 |
| 12 | 12.75 | 323.8 | 0.406 | 10.31 |
| 14 | 14 | 355.6 | 0.375 | 11.13 |
| 16 | 16 | 406.4 | 0.5 | 12.7 |
| 18 | 18 | 457 | 0.562 | 14.27 |
| 20 | 20 | 508 | 0.594 | 15.09 |
| 24 | 24 | 610 | 0.688 | 17.48 |
2. SCH 40 Steel Pipe Weight
The table below contains two weights, one is sch 40 weight lb/ft, and the other is sch 40 weight kg/m.
For example: NPS: 1/2, 0.85 lb/ft; 1.27 kg/m.
NPS: 2, 0.85 lb/ft; 1.27 kg/m.
| Nominal size [in inches] | 1/8 | 1/4 | 1/2 | 3/4 | 1 | 1.25 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 24 |
| Weight [lb/ft] | 0.24 | 0.42 | 0.85 | 1.13 | 1.68 | 2.27 | 2.72 | 3.65 | 5.79 | 7.58 | 9.11 | 10.79 | 14.62 | 18.97 | 28.55 | 40.48 | 53.52 | 54.57 | 82.77 | 104.67 | 123.11 | 171.29 |
| Weight [kg/m] | 0.37 | 0.84 | 1.27 | 1.69 | 2.5 | 3.39 | 4.05 | 5.44 | 8.63 | 11.29 | 13.57 | 16.07 | 21.77 | 28.26 | 42.55 | 60.31 | 79.73 | 94.55 | 123.3 | 155.8 | 183.42 | 255.41 |
3. Schedule 40 Steel Pipe Maximum Working Pressure
There are many factors that affect pipeline pressure, the most important of which are:
- Material grade: ASTM A106 Gr.B pipes have a maximum pressure of 15.3MPa at 20°C.
- Temperature reduction: At 204°C, the pressure capacity drops to 72% of the normal temperature value.
- Size differences: The pressure difference between NPS 2“ and NPS 12” pipes of the same material can reach 40%.
| Nominal size [in inches] | 1/8″ | 1/4″ | 3/8″ | 1/2″ | 3/4″ | 1″ | 1.5″ | 2″ | 4″ |
| Maximum working pressure (PSI, water) | 810 | 780 | 620 | 600 | 480 | 450 | 330 | 280 | 150 |
Tuspipe is a major supplier and manufacturer of Sch 40 carbon pipe products. There are many levels of carbon and different chemical compositions. Pressure bearing capacity is measured and classified. Carbon steel pipe Schedule 40 is a medium pressure range pipe with a maximum diameter of 24 inches and a maximum wall thickness of 46 mm.
Sch 40 Pipe Selection and Application
Sch 40 Pipe Selection
The fittings factor for choosing schedule 40 pipe is the pressure level, this pipe is suitable for working in the environment where the pressure is about 0.6~4.0 MPa, if the environmental pressure requirement is higher, you can choose schedule 80 pipe, if the pressure requirement is not very strict, you can choose schedule 20 pipe, choose it according to the requirement to avoid wasting resources.
Secondly, according to the choice of material, schedule 40 pipeline not only regulates the standard of carbon steel pipe, but also expensive PVC pipe, for example, irrigation scenario, drainage system can choose schedule 40 PVC pipe, the cost is lower. For more corrosive scenarios, such as gas and chemical, you can choose schedule 40 stainless steel piping.
Application of Schedule 40 Steel Pipe
Schedule 40 steel pipes are used in a wide range of industries.
Such as urban water supply, gas, heat and other systems in municipal engineering, Schedule 40 pipe is suitable for transporting various fluid media. In the industrial oil, gas, chemical, and pharmaceutical industries, Schedule 40 pipes are cost-effective for transporting a wide range of corrosive media and high-pressure gases. In the water supply, drainage, fire fighting, and other systems of civil buildings, it transmits clean water, sewage and fire fighting water.
Schedule 40 Pipe Dimensions Conclusion
In short, Schedule 40 pipe sizing parameters constitute a complex and critical system that, taken together, determines the function of the pipe and its practical application outcomes. In the process of selecting and operating Schedule 40 pipe, it is necessary to deeply understand all its size parameters, and make a wise choice and application after referring to the actual needs of the project.
FAQs:
1. What are the sizes of steel pipe SCH40 and 80?
Schedule 40 pipe dimensions cover NPS values, extending from 1/8 inch to 36 inch. Although the wall thickness of the sch 80 pipe varies, the nominal pipe sizes are consistent and include the same range of NPS values from 1/8 schedule 40 pipe dimensions to 36 inch.
2. How do I choose the right pipe schedule?
The core formula for determining pipeline progress is SCH=1000 (P/S). P stands for stress at work, S for stress. They are all expressed in pounds per square inch (psi), with SCH standing for the pipeline’s progress abbreviation.
3. Schedule 40 pvc pipe thickness in mm
| Nom. Pipe Size (NPS) | DN (mm) | O.D. (mm) | Min. Wall Thickness (mm) | Pressure Rating |
| 1/8″ | 6 | 10.29 | 1.73 | 810 psi (55.8 bar) |
| 1/4″ | 8 | 13.72 | 2.24 | 780 psi (53.8 bar) |
| 3/8″ | 10 | 17.15 | 2.31 | 620 psi (42.7 bar) |
| 1/2″ | 15 | 21.34 | 2.77 | 600 psi (41.4 bar) |
| 3/4″ | 20 | 26.67 | 2.87 | 480 psi (33.1 bar) |
| 1″ | 25 | 33.4 | 3.38 | 450 psi (31.0 bar) |
| 1 1/4″ | 32 | 42.16 | 3.56 | 370 psi (25.5 bar) |
| 1 1/2″ | 40 | 48.26 | 3.68 | 330 psi (22.8 bar) |
| 2″ | 50 | 60.33 | 3.91 | 280 psi (19.3 bar) |
| 2 1/2″ | 65 | 73.03 | 5.16 | 300 psi (20.7 bar) |
| 3″ | 80 | 88.9 | 5.49 | 260 psi (17.9 bar) |
| 4″ | 100 | 114.3 | 6.02 | 220 psi (15.2 bar) |
| 6″ | 150 | 168.28 | 7.11 | 180 psi (12.4 bar) |
4. Why do Schedule 40 and Schedule 80 pipes with the same NPS (nominal pipe size) have actual inner diameters that differ by as much as 12%?
NPS (nominal pipe size) is a standardized designation for pipe dimensions, whose values are close to but not equal to the actual outer diameter. Pipes with the same NPS have a uniform outer diameter (e.g., the outer diameter of an NPS 2″ pipe is always 60.3 mm). An increase in SCH grade means an increase in wall thickness, which compresses the inner diameter:
inner diameter = outer diameter – 2 × wall thickness.
Each increase in SCH grade results in a wall thickness increase of approximately 20%-40%, inevitably leading to a stepwise reduction in inner diameter under fixed outer diameter conditions. A 12% difference is a typical value for the transition from SCH40 to SCH80, reflecting the core design logic of the American standard system: “fixed outer diameter, graded wall thickness.”
