METHOD STATEMENT To INSTALL BRANCH TO PRE-INSULATED DUCTWORK

The following list is the considered methodology to install branch to a section of pre-insulated ductwork.

Operative to arrive a work face.
Operative to have current revision of working drawing.
Operative to have the following tools to carry out the operation.
(a) 1m long rule
(b) Marker
(c) Cutting tools for 90° and 45° cuts
(d) Approved adhesive
(e) Aluminium foil self-adhesive duct tap.
Operative to ensure the area affords correct amount of space to carry out the work.
Operative to position duct on floor.
Operative to mark opening that is to be cut (using metal rule for accuracy)
For branch connections the operative then cuts the 4 sides of the hole, 1 at 90° and 3 at 45° (to match the fitting to be installed by using 45° tool cutter and 90° tool cutter)
Operative the cleans the mitered faces.
Operative applies the adhesive to all faces, hole in duct and to the fitting that is to be installed.
Operative waits 15 minutes till both faces are tacky.
Operative puts both sections together.
Operative to wait 5 mins. For joint to set.
Check for vertically with square.
Operative to apply 2 layers of aluminium foil self-adhesive taps to all 4 joints.
Completed duct section is now ready to be incorporated into the run of ductwork.