938-96 Series Deflection Gauges Sizes: 4" to 27"
| For other test equipment click here 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 | 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 26 | 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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Aluminum Deflection Gauges
Aluminum Fin Style Deflection Gauge: - Lightweight, corrosion-resistant
- Field-verifiable without a proving ring
- Assembles without tools
- All sizes fit through standard 24" manhole
- Fins for 4"-15" gauges have skid size equal to the nominal pipe size-gauge will meet regional codes and will not tip in the line
- Nine-fin design ensures testing accuracy
- Open design allows gravel and debris pass-through
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 | Field Verification:
Fin Style Deflection Gauges are designed to be field verified by inspectors without the use of a proving ring. Simply place two fins end to end as pictured to the right and measure the width.
Add one inch to the mandrel and you have the outside dimension of the gauge. Using this method simplifies the inspector's job of verifying sizes on deflection gauges. |
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Click an Item Number below to order
| Nominal Size | Pipe | Deflection | Shpg Wt lbs | Item Number | Unit Price Each | | Aluminum Fin Sets | | 6", 8", 10" | SDR 26 | 5% | 18 | 938-9610-265 | | | 6", 8", 10" | SDR 35 | 5% | 18 | 938-9610-355 | | | 6", 8", 10" | SDR 35 | 7.5% | 18 | 938-9610-3575 | | | 8", 10", 12" | SDR 26 | 5% | 19 | 938-9612-265 | | | 8", 10", 12" | SDR 35 | 5% | 19 | 938-9612-355 | | | 8", 10", 12" | SDR 35 | 7.5% | 19 | 938-9612-3575 | | |
| | | Nominal Size | Description | Shpg Wt lbs | Item Number | Unit Price Each | | Mandrels | | 10" | Mandrel (4" -15" Fins) | 3 | 938-9610-10 | | | 24" | Mandrel (18"- 48" Fins) | 6 | 938-9610-24 | | |
Fixed Steel Style Deflection Gauges - Durable, zinc-plated construction resists corrosion
- Conforms to mandrel sizing specifications-blade length is equal to or greater than the nominal pipe size
- Nine-arm design ensures testing accuracy
- Open design allows gravel and debris pass-through
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Proving Rings - Used to verify deflection gauge sizes
- Standard sizes: 6"-15" SDR 35 5% deflection and
8"-12" SDR 35 7.5% deflection - Custom sizes for 5"-18" also available
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