The Trenton Keyhole Patch Pad and Tools
enable utilities to apply a coating to a pipe surface through
a small-diameter hole or keyhole. The components include two
tools (attached to extendable poles) and a patch pad with
The system is an excellent solution for
applying a coating within a small-diameter hole over cadwelds
or coating holidays.
Coating is pre-applied or hand-applied
Non-hazardous, no VOCs
No waiting for drying or curing
Minimal surface preparation
Wire brush and clean the surface
of any loose coating, rust, scale and foreign matter.
Secure the extension handles (supplied
by Trenton or by the utility) to the patch pad applicator
and the finishing tool.
Attach a pre-coated patch pad
to the applicator tool. (Or anticorrosion compound can be
applied by hand directly to the bottom of a dry pad.)
The applicator tool, with the
coated patch pad attached, is then lowered into the keyhole
and onto the pipe surface to be protected.
Use the finishing tool to hold
the patch pad to the pipe while lifting off the applicator
tool and leaving the patch pad on the pipe.
Use the finishing tool to press
the pad firmly to the pipe, making sure that coating compound
is squeezed out on all edges and ensuring that the pad is
The patch pad (with coating) now
protects the pipe, and backfill can begin immediately.
Patch Pad: 4”, 6" or 5"×8"
Tools: Patch pad applicator and a finishing
Specifications: PATCH PAD COATING:
Flash point: 350°F (minimum)
Dielectric strength: 100 volts per mil
The Trenton Keyhole Patch Pad applicator tool
has a velcro surface (left) for holding the Patch Pad. The center
picture shows the applicator tool with an attached Patch Pad that
has pre-applied coating. The finishing tool (right) is used to press
the Patch Pad onto the pipe.