We have a new video on Youtube, showing how to change out shoulder bolts on the big 00620 Series Duct Pullers! The 10″ & 12″ Pullers have removable shells so that you can swap in the appropriate size, depending on your duct’s wall thickness. We have complete Pullers available with SDR9, 11 or 17 shells, and shell kits are available for field change-outs.
 

In other news, DCD Duct Pullers have been put to work in the material science lab, gripping tensile samples of C900 PVC pipe. S&B Technical Products presented a paper at the UCT Expo in Tampa recently, detailing their testing of the Bulldog Restraint System for AWWA C900 PVC pressure pipe. The assembled joints are as strong as the pipe, and can be installed by trenchless methods like Horizontal Directional Drilling.
Our 00620 & 00621 Series Duct Pullers were matched to the appropriate inside wall diameters for the PVC pipe – because PVC is a stronger material, the ID is greater than expected for a nominal pipe diameter. (We had to use a couple of metric-sized pullers to match it all up!)
Now we’re working with S&B Technical to optimize the Pullers’ expanding shells for PVC pipe.

In other Duct Puller news, DCD Design is encouraging a visual inspection of all 12″ Duct Pullers in service to check the length of the shoulder bolts securing the expanding shells into the faceplates.
Bolts that are too short and don’t seat properly in the faceplate – see the photo – can be exchanged by contacting DCD Design.