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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.
Cherne Deflection Gauges

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.
 




Cherne Air-Loc Line Stringer