What is the de-rating factor for PVC SCH40 and SCH80 pipe?

SCH40 PVC Pipe Size and Pressure Data

Nominal Pipe Size (in)

O.D.

Average I.D

Min. Wall

Nominal Weight/Foot

Maximum W.P. PSI **

1/4"

0.540"

0.344"

0.088"

0.086 lb

780

3/8"

0.675"

0.473"

0.091"

0.115 lb

620

1/2"

0.840"

0.602"

0.109"

0.170 lb

600

3/4"

1.050"

0.804"

0.113"

0.226 lb

480

1"

1.315'

1.029"

0.133"

0.333 lb

450

1-1/4"

1.660"

1.360"

0.140"

0.450 lb

370

1-1/2"

1.900"

1.590"

0.145"

0.537 lb

330

2"

2.375"

2.047"

0.154"

0.720 lb

280

2-1/2"

2.875"

2.445"

0.203'

1.136 lb

300

3"

3.500"

3.042"

0.216"

1.488 lb

260

4"

4.500"

3.998"

0.237"

2.118 lb

220

6"

6.625"

6.031"

0.280"

3.733 lb

180

8"

8.625"

7.942"

0.322"

5.619 lb

160

10"

10.750"

9.976"

0.365"

7.966 lb

140

12"

12.750"

11.889"

0.406"

10.534 lb

130

18"

18.000"

16.809"

0.562"

20.587 lb

130

20"

20.000"

18.743"

0.593"

24.183 lb

120

24"

24.000"

22.544"

0.687"

33.652

120

** The Pressure ratings shown are for water, non-shock, @ 73° F with plain end pipe.  Threaded pipe requires a 50% reduction in the pressure ratings stated.  Appropriate temperature de-rating factors must be applied to determine the maximum allowable pressure when working at elevated temperatures greater than 73° F.

 

SCH80 PVC Pipe Size and Pressure Data

Nominal Pipe Size (in)

O.D.

Average I.D.

Min. Wall

Nominal Weight/Foot

Maximum W.P. PSI **

1/4"

0.540"

0.282"

0.119"

0.105 lb

1130

3/8"

0.675"

0.403"

0.126"

0.146 lb

920

1/2"

0.840"

0.526"

0.147"

0.213 lb

850

3/4"

1.050"

0.722"

0.154"

0.289 lb

690

1"

1.315'

0.936"

0.179"

0.424 lb

630

1-1/4"

1.660"

1.255"

0.191"

0.586 lb

520

1-1/2"

1.900"

1.476"

0.200"

0.711 lb

470

2"

2.375"

1.913"

0.218"

0.984 lb

400

2-1/2"

2.875"

2.290"

0.276"

1.500 lb

420

3"

3.500"

2.864"

0.300"

2.010 lb

370

4"

4.500"

3.786"

0.337"

2.938 lb

320

6"

6.625"

5.709"

0.432"

5.610 lb

280

8"

8.625"

7.565

0.500"

8.522 lb

250

10"

10.750"

9.493"

0.593"

12.635 lb

230

12"

12.750"

11.294"

0.687"

17.384 lb

230

18"

18.000"

16.014"

0.937"

33.544 lb

220

20"

20.000"

17.814"

1.031"

41.047 lb

220

24"

24.000"

21.418"

1.218"

58.233 lb

210

** Pressure ratings shown are for water, non-shock, @ 73° F with plain end pipe.  Threaded pipe requires a 50% reduction in the pressure ratings stated.  Appropriate temperature de-rating factors must be applied to determine the maximum allowable pressure when working at elevated temperatures greater than 73° F.

De-rating Factor

Operating Temperature(F°)

De-rating Factor

73

1.00

80

0.88

90

0.75

100

0.62

110

0.51

120

0.40

130

0.31

140

0.22

 

 

Example: 10" PVC Schedule 80 @120° F =?
                230 PSI X 0.40 = 90 PSI max @ 120° F

Article Title:
What is the de-rating factor for PVC SCH40 and SCH80 pipe?
Article Summary:
This article includes pipe dimensions, pressure ratings, and de-rating factors at various temperatures.
Article Date:
11/20/2007
Article ID:
747
10 user(s) found this article useful. Was this article useful to you?
Share

Information disclaimer:

The information contained in this article is for general information purposes only. The information is provided by United States Plastic Corp. and while we endeavor to keep the information up to date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk.

In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from loss of materials, time or profits arising out of, or in connection with, the use of this information.