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What Do The Different Schedules Mean?
The number following “Schedule” usually indicates a series of pipe wall thicknesses. The smaller the number after “Schedule,” the thinner the pipe wall, and the larger the number, the thicker the pipe wall.
Schedule 40 vs 80 Steel Pipe Core Differences
Wall thickness
Schedule 40 vs 80 Steel Pipe the most crucial difference is the wall thickness; all other differences stem from this difference. Even with the same NPS, the Schedule 80 pipe has a thicker wall than the Schedule 40 pipe.
schedule 40 vs 80 Steel Pipe Thickness Chart
| NPS | Outer diameter (inches) | SCH 40 wall thickness (inches) | SCH 80 Wall thickness (inches) |
|---|---|---|---|
| 1/4″ | 0.540 | 0.088 | 0.119 |
| 1/2″ | 0.840 | 0.109 | 0.147 |
| 3/4″ | 1.050 | 0.113 | 0.154 |
| 1″ | 1.315 | 0.133 | 0.179 |
| 1¼″ | 1.660 | 0.140 | 0.191 |
| 1½″ | 1.900 | 0.145 | 0.200 |
| 2″ | 2.375 | 0.154 | 0.218 |
| 2½″ | 2.875 | 0.203 | 0.276 |
| … | … | … | … |
| 5″ | 5.563 | 0.258 | 0.375 |
| … | … | … | … |
| 10″ | 10.750 | 0.365 | 0.500 |
Schedule 40 vs 80 Steel Pipe：Which Is More Durable?
Schedule 80 is more durable because it has thicker walls, higher strength, and greater pressure and load-bearing capacity. In many ways, Schedule 80 pipe is more durable and outperforms Schedule 840 pipe in all aspects.Schedule 40 pipe is more suitable for low to medium pressure environments, while Schedule 80 pipe is commonly used for medium to high pressure environments.
Price Comparison Of Schedule 40 vs Schedule 80 Steel Pipe
While Sch80 pipes are more robust and durable, they are also more expensive. Sch40 pipes are thinner and use less material, while Sch80 uses more material and has more stringent manufacturing requirements, resulting in higher costs. In terms of total material costs, Sch40 is 25%-30% cheaper than Sch80. You need to comprehensively evaluate your usage environment to determine which pipe offers the best cost-performance ratio.
Schedule 40 vs 80 Steel Pipe Application Scenarios
Schedule 40 Common Scenarios
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- Residential and commercial water supply: The standard piping for indoor or outdoor water supply is Schedule 40 ERW pipe.
- Low-pressure gas transmission: Transmission of some non-critical gases.
- Other scenarios: Applications where pressure and durability requirements are not high, and cost-effectiveness is prioritized.
Schedule 80 Forced Use Environment
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- Steam transmission pipeline: The pressure in this scenario exceeds 10 bar or the temperature exceeds 150℃. The use of Sch80 steel pipes meets the requirements of ASME B31.3 standard.
- Chemical corrosive media: Sch80 must be used in oil and gas pipelines containing H2S or CO2 because these media are corrosive. Sch80 has a given thickness of 2mm to resist erosion.
- High-pressure hydraulic system: In the power pipeline of engineering machinery, when the working pressure reaches or exceeds 250 bar, Sch80 must be used.
- Submarine pipeline outer layer: The pressure in this environment is about three times the pressure resistance of Sch40, so Sch80 must be selected to be competent.
Schedule 40 vs 80 Steel Pipe Premium Manufacturers
Are you looking for a high-quality supplier of Sch40 or Sch80 pipes? Or are you undecided between these two sizes, unsure which is best suited for your project? Click the button below to contact PANDAPIPE. PANDAPIPE is a pipe manufacturer with 28 years of experience, and our pipes are sold throughout Europe, North and South America, Africa, and Asia. Choosing PANDAPIPE means choosing a high-quality and high-service pipe company.
FAQ
1.Thick-walled pipes are safer?
The risk of brittle fracture of Sch80 in low temperature environment is 30% higher than that of Sch40 (refer to Charpy impact test data)
2.Can different schedule pipe fittings be mixed?
ASME B31.3 explicitly prohibits the mixing of threaded connectors of different schedule grades
2.Is Sch80 suitable for all high-pressure scenarios?
When the medium temperature exceeds 200℃, Sch160 should be used instead of Sch
