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Deflection
Gauges
Deflection Gauges (mandrels) are used to test flexible sewer pipe for
out-of-roundness or deflection per ASTM specifications D3034 and F679.
This testing ensures that flexible pipe has been properly bedded and
backfilled (ASTM D2321) to give optimal performance.
Both steel and aluminum gauges utilize a nine arm design to ensure the
pipe is tested accurately. This design also allows gravel and debris to
easily pass through. Other gauges can get hung up – causing a deflection
test to fail, even though the pipe is within tolerance. Sized to .01" ,
both deflection gauge styles meet ASTM requirements. |
 |
|
Nominal Size |
Pipe |
Average ID |
Base ID* |
5% Deflection |
7.5% Deflection |
|
ASTM Specification D3034 (4" - 15") |
|
4" |
SDR 35 |
3.965 |
3.895 |
3.70 |
3.60 |
|
6" |
SDR 2 |
5.764 |
5.612 |
5.33 |
5.19 |
|
6" |
SDR 35 |
5.893 |
5.742 |
5.46 |
5.31 |
|
8" |
SDR 26 |
7.715 |
7.488 |
7.11 |
6.93 |
|
8" |
SDR 35 |
7.891 |
7.665 |
7.28 |
7.09 |
|
10" |
SDR 26 |
9.644 |
9.342 |
8.87 |
8.64 |
|
10" |
SDR 35 |
9.864 |
9.563 |
9.08 |
8.84 |
|
12" |
SDR 26 |
11.480 |
11.102 |
10.55 |
10.27 |
|
12" |
SDR 35 |
11.737 |
11.361 |
10.79 |
10.51 |
|
15" |
SDR 26 |
14.053 |
13.575 |
12.90 |
12.56 |
|
15" |
SDR 35 |
14.374 |
13.898 |
13.20 |
12.86 |
|
Nominal Size |
Pipe |
Average ID |
Base ID* |
5% Deflection |
7.5% Deflection |
|
ASTM Specification F679 (18" - 27") |
|
18" |
SDR 26 |
17.177 |
16.586 |
15.76 |
15.34 |
|
18" |
SDR 35 |
17.564 |
16.976 |
16.13 |
15.70 |
|
21" |
SDR 26 |
20.249 |
19.545 |
18.57 |
18.08 |
|
21" |
SDR 35 |
20.707 |
20.004 |
19.00 |
18.50 |
|
24" |
SDR 26 |
23.296 |
22.480 |
21.36 |
20.80 |
|
24" |
SDR 35 |
22.781 |
21.964 |
20.87 |
20.32 |
|
27" |
SDR 26 |
25.674 |
24.744 |
23.51 |
22.89 |
|
27" |
SDR 35 |
26.258 |
25.327 |
24.06 |
23.43 |
|
30" |
SDR 26 |
29.306 |
28.763 |
27.32 |
26.61 |
*Base Inside Diameter (Base
ID) - Allows for out of roundness and wall thickness tolerances as
defined by ASTM standards.
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