Deflection Gauges, Mandrels

Deflection gauges, "mandrels", are used to test flexible sewer pipes for out-of-roundness (deflection). This testing ensures flexible pipe has been properly bedded and back-filled to give optimum performance (ASTM Designation D2321-89).

Adjustable Aluminum Deflection Gauges

Utilizes a 9 arm design to ensure the pipe is tested accurately. Sized to within .01" to meet ASTM requirements. Constructed of lightweight aluminum, gauges will not rust and are up to 75% lighter in comparison to steel models. Economical and versatile patented design, features interchangeable fins for different pipe sizes.

Field Verification: Cherne's Aluminum 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 below (1) and measure the width. Add one inch to the mandrel (2) and you have the outside dimension of the gauge. Using this method simplifies the inspector's job of verifying sizes on deflection gauges.

Features:

Sizes & Specifications

Steel Gauges

Designed to allow gravel and debris to pass through easily. Other kinds of gauges have a tendency to get hung up on rocks and obstructions causing a deflection test to fail even though the pipe is within deflection tolerances creating a great expense for the contractor.

Features:

Sizes & Specifications

Manhole Winch & Manhole Jack

Manhole Winch:

Manhole Jack (Hose Guide):

Sizes & Specifications

One Piece Deflection Gauge System

Custom Sizes & Specs Always Available on Deflection Gauges & Proving Rings!

Features: