Mainline Pipe
It’s a good idea to keep an eye on your potential mainline pipe sizing when thinking about the maximum flows through your system.
The maximum allowable flows through various sizes of PVC mainline pipe listed below are based on the velocity of 5 fps (1.5 m/s), with slightly slower velocity options for the larger pipe sizes.
| PVC Sch 40 and Class 315 | |||
|---|---|---|---|
| Size In. | GPM @ FPS | ||
| 3/4” | 8.33 @ 5 | ||
| 1” | 13.5 @ 5 | ||
| 1 1/4” | 24.0 @ 5 | ||
| 1 1/2” | 32.0 @ 5 | ||
| 2” | 50 @ 5 | ||
| 2 1/2” | 73 @ 5 | ||
| 3” | 105 @ 4.6 | 110 @ 5 | |
| 4” | 160 @ 4.4 | 180 @ 5 | |
| 6” | 332 @ 4.25 | 385 @ 5 | |
| PVC Sch 40 and Class 315 | |||
|---|---|---|---|
| Size MM | L/Min. @ M/S | ||
| 20mm | 31.5 @ 1.52 | ||
| 25mm | 51 @ 1.52 | ||
| 32mm | 91 @ 1.52 | ||
| 40mm | 121 @ 1.52 | ||
| 50mm | 189 @ 1.52 | ||
| 63mm | 246 @ 1.52 | ||
| 76mm | 397 @ 1.40 | 416 @ 1.52 | |
| 100mm | 606 @ 1.34 | 680 @ 1.52 | |
| 150mm | 1,257 @ 1.29 | 1,457 @ 1.52 | |
The diagram to the right illustrates several crucial components of an irrigation system design, including mainline pipe. These components are available in our equipment database, allowing you to spec them and use them in your irrigation plans while designing a system using AutoCAD. Click the image to see an enlarged version.
This diagram is a page from our Irrigation Getting Started Guide that illustrates several irrigation components available in our equipment database.
Download and print our Irrigation Getting Started Guide >
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