HS CODE : 8467 Hydraulic operated auto feeding Under Pressure Drilling Machine is used for drilling to take branch connections from Large Diameter Cast Iron, Ductile Iron and Mild Steel pipes, trepanning vessels and blank flanges while under pressure.
The first operation is to mount a welded steel flange or cast iron tee on the main to drilled and pressure it carries. Place the valve for stopping-off operation or permanent for a branch connection. A combination of cup drill and center drill is used to cut the piece or coupon from the pipe. Spring loaded balls on the center drill expand beneath the coupon after drilling and cutting. The drill shaft is retracted and the coupon brought back the cutting portion with the drill head, tight the valve and machine can be removed.