University Studies and Independent Research
While we think Squirter® DTIs are the easiest thing to install and inspect, and the jobsite feedback is nothing but positive, some independent verification goes a long way.
The University of Toronto studied the performance of Squirter® DTIs with the muscle being provided by the Ironworkers Local 721. In short, the Ironworkers performed our recommended Squirter® DTI Calibration Exercise (how much squirt is enough squirt) on 7/8" A325 bolt assemblies in a calibrated Skidmore-Wilhelm. Then tensioned these bolts (that were specially prepared to be measured ultrasonically) until they saw the calibrated amount of silicone emit from the Squirter DTI. The University then measured the bolt assemblies ultrasonically and the achieved clamp load was almost dead-on. The minimum required load for a 7/8" A325 bolt is 39,000 and the calibrated Squirter load was 45,000. The Ironworkers achieved an astonishing average of 45,600 pounds of tension!The Florida DOT was interested in the advantages the Squirter® DTIs offered right from the get go. They, with the help of Keith & Schnars and Woodhopkins Erectors, put Squirter® DTIs up against their long time favorite, Turn-of-Nut, on the Beaver Street Bridge in Jacksonville, FL. Squirter® DTIs came out FAR ahead.