Squirter® DTIs and Constructability
Bolting can consume 30 percent of all field labor to erect steelwork. Inspection labor would be in addition to this.
Technologies make a lot of sense that reduce field installation and inspection labor, and that's what constructability is all about.
Here's a calculation relevant to bolting that illustrates this:
The loaded labor cost on a power plant is (say) $50.00 per man-hour, and field bolting is accomplished at 15 bolts per man-hour. Each bolt therefore costs $50/15 or $3.33 to install. A 20% improvement in overall bolting efficiency would therefore save $0.66 per bolt. The added cost of a Squirter® DTI will be about $0.20 per bolt if regular non-squirting DTI's were to be used, or $0.60 if no DTI were otherwise to be used.
Therefore, if the addition of a DTI or Squirter® DTI allows a 20% improvement in bolting efficiency, then the benefit-to-cost ratio is positive, and "constructability" is enhanced.
In the words of a Construction Coordinator of the largest EPC industrial and power contractor in the world, a company that has specified more than four million Squirter® DTI's,
"...The benefits are numerous. Installation is faster, rework almost nonexistent and inspection a breeze. No more marking of bolts for the turn-of-the-nut method, no more feeler gages, etc. Craft can easily see the silicone, when it squirts out, during the installation assuring that they have achieved the required tension. Field engineers and inspectors can easily see the bright orange squirts from almost anywhere (no need for manlifts or climbing scaffolding to check with feeler gages."
