CHERNE
- Deflection Gauges - Steel Deflection Gauges -
Aluminum Adjustable Deflection Gauges
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TECHNICAL DATA |
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CHERNE Aluminum and Steel Deflection Gauges |
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Steel Deflection Gauges |
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. |
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Nominal Size
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Pipe
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Average ID
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Base ID*
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5% Deflection
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7.5% Deflection
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ASTM Specification D3034 (4" - 15")
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4"
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SDR 35
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3.965
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3.895
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3.70
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3.60
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6"
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SDR 2
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5.764
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5.612
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5.33
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5.19
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6"
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SDR 35
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5.893
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5.742
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5.46
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5.31
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8"
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SDR 26
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7.715
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7.488
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7.11
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6.93
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8"
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SDR 35
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7.891
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7.665
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7.28
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7.09
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10"
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SDR 26
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9.644
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9.342
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8.87
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8.64
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10"
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SDR 35
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9.864
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9.563
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9.08
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8.84
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12"
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SDR 26
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11.480
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11.102
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10.55
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10.27
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12"
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SDR 35
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11.737
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11.361
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10.79
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10.51
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15"
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SDR 26
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14.053
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13.575
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12.90
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12.56
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15"
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SDR 35
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14.374
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13.898
|
13.20
|
12.86
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Nominal Size
|
Pipe
|
Average ID
|
Base ID*
|
5% Deflection
|
7.5% Deflection
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ASTM Specification F679 (18" - 27")
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18"
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SDR 26
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17.177
|
16.586
|
15.76
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15.34
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18"
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SDR 35
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17.564
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16.976
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16.13
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15.70
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21"
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SDR 26
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20.249
|
19.545
|
18.57
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18.08
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21"
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SDR 35
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20.707
|
20.004
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19.00
|
18.50
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24"
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SDR 26
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23.296
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22.480
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21.36
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20.80
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24"
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SDR 35
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22.781
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21.964
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20.87
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20.32
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27"
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SDR 26
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25.674
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24.744
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23.51
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22.89
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27"
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SDR 35
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26.258
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25.327
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24.06
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23.43
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30"
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SDR 26
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29.306
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28.763
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27.32
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26.61
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*Base
Inside Diameter (Base ID) - Allows for out of roundness and wall thickness
tolerances as defined by ASTM standards.
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