Deflection Gauges, Deflection Testing, 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:

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 to pass-through
Kits covering pipe sizes 6-10" or 8-12" are available

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:

Durable steel construction for municipalities that requires steel mandrels
Zinc plated which resists rust and corrosion
Nine-arm design ensures testing accuracy
Open design allows gravel and debris pass-through
Conforms to mandrel sizing specification:
Blade length is equal to or greater than the nominal pipe size to conform with mandrel sizing specifications
5% & 7.5% Gauges for SDR-35 Pipe per ASTM D3034 (4"-15" Dia.)
5% & 7.5% Gauges for SDR-26 Pipe per ASTM D3034 (4" -15" Dia.)
5% & 7.5% for PS 46 (SDR-35) Pipe per ASTM F679 (18" - 48" Dia.)
5% & 7.5% for PS 115 (SDR-26) Pipe per ASTM F679 (18" - 48" Dia.)

Sizes & Specifications

Manhole Winch & Manhole Jack

Manhole Winch:

Drags plugs in leak location testing, deflection gauges
Feeds Jet-Ball down line for sewer cleaning
Normal pull-strength up to 550 pounds
500 feet of 3/32" diameter steel cable

Manhole Jack (Hose Guide):

Guides air hoses and cables at pipe invert in manhole
Zinc-plated for corrosion resistance
Fits pipe 5"-24"
Includes eye bolt for securing rope and ease of retrieval

Sizes & Specifications

One Piece Deflection Gauge System

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

Features:

Lightweight T6061 Aluminum Construction
Available in Steel
High Clearance to Avoid Getting Stuck on Debris
Permanently Marked with Size & Deflection - Won't Scrape Off - Letters Cut into Fins
One Piece Forged Eyebolts
Snap-Lock Fins
Fits down 24" Manholes
Proving Rings Available for All Sizes
No Tools Needed - No Bolts, Nuts, or Pins!
Size & Deflection Cut into Ring - Will not Scrape Off
5% & 7.5% Deflection Gauges for SDR-26 Pipe (Sizes from 6" thru 30")
5% & 7.5% Deflection Gauges for SDR-35 Pipe (Sizes from 4" thru 27")

Deflection Gauges, Mandrels

Adjustable Aluminum Deflection Gauges

Steel Gauges

Manhole Winch & Manhole Jack

One Piece Deflection Gauge System