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Schedule 40 vs. Schedule 80

When dealing with PVC Landscape supplies it is very important to understand some of the language that is used. Two of the most common terms when referencing Landscaping supplies are PVC Schedule 40 and PVC Schedule 80. These two terms each refer to the wall thickness of the PVC item (Pipe or fitting) in question. Schedule 40 PVC Pipes will have the same outside diameter as Schedule 80 PVC Pipes and a different inside diameter. It is the opposite with PVC Fittings - The inner diameter is the same while the outer diameter will be different.

Because of the difference in sizes, Schedule 40 PVC Pipes and Fittings will have different applications then Schedule 80 PVC Pipes and Fittings. Because Schedule 80 Pipes and Fittings are thicker, they are better applied to jobs that require higher in-pipe pressure or higher water temperature. The thickness of the PVC wall becomes more important when dealing with larger pipes. 2” Schedule 80 Pipes will be rated up to 400 PSI compared to a rating of 280 PSI for 2” Schedule 40 pipe. Smaller pipe diameters will result in a stronger pipe, and thus will withstand higher water pressure.

Because of Schedule 80 PVC's hardier qualities, it is less often used in the Irrigation Supply and Landscape business (about 5% of the time) and more often used in industrial businesses. To top that off, PVC Schedule 80 is quite a bit more expensive than Schedule 40 PVC. When cost is an issue (as it usually is), Schedule 40 PVC is your friend.

Below is a list of Schedule 40 and Schedule 80 Specifications:

Schedule 40 Specifications:

Nominal Pipe Size (in)

Outside Diameter

Minimum Wall

Max Water Pressure (PSI)

1/8"

0.405

0.068

810

1/4"

0.540

0.088

780

3/8"

0.675

0.091

620

1/2"

0.840

0.109

600

3/4"

1.050

0.113

480

1"

1.315

0.133

450

1 1/4"

1.660

0.14

370

1 1/2"

1.900

0.145

330

2"

2.375

0.154

280

2 1/2"

2.875

0.203

300

3"

3.500

0.216

260

3 1/2"

4.000

0.226

240

4"

4.500

0.237

220

5"

5.563

0.258

190

6"

6.625

0.28

180

8"

8.625

0.322

160

10"

10.750

0.365

140

12"

12.750

0.406

130

14"

14.000

0.437

130

16"

16.000

0.5

130

18"

18.000

0.562

130

20"

20.000

0.593

120

24"

24.000

0.687

120

Schedule 80 Specifications:

Nominal Pipe Size (in)

Outside Diameter

Minimum Wall

Max. Water Pressure (PSI)

1/8"

0.405

0.095

1230

1/4"

0.54

0.119

1130

3/8"

0.675

0.126

920

1/2"

0.84

0.147

850

3/4"

1.05

0.154

690

1"

1.315

0.179

630

1-1/4"

1.66

0.191

520

1-1/2"

1.9

0.2

470

2"

2.375

0.218

400

2-1/2"

2.875

0.276

420

3"

3.5

0.3

370

3-1/2"

4

0.318

350

4"

4.5

0.337

320

5"

5.563

0.375

290

6"

6.625

0.432

280

8"

8.625

0.5

250

10"

10.75

0.593

230

12"

12.75

0.687

230

14"

14

0.75

220

16"

16

0.843

220

18"

18

0.937

220

20"

20

1.031

220

24"

24

1.218

210

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