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MUELLER ® LARGE DRILLING MACHINES 3.1 Shaded area indicates change Rev. 1-09 The Mueller method for making a lateral connection (Mueller ® CL-12 ™ Drilling Machine shown) Large Drilling Machines are used for making 2" to 24" lateral connections on water mains under pressure. These machines are available with the tools and accessories for cutting a wide variety of pipe. These large drilling machines are built to take the hard use and rough handling that is unavoidable when working on mains. They need only minimum maintenance to provide long life and satisfactory use. The various drilling machines are simple to operate and, because they are similar in design and operation, training operators to use them is an easy task. These machines are part of a complete selection of equipment, products and methods developed by Mueller Co. to perform the variety of operations needed to install, extend and maintain today’s water systems. The designed-in compatibility of each part of the Mueller selection helps everything go together easily for strong, leak-tight installations. Mueller methods and equipment let you work on pressurized water mains without interrupting flow. 1. The tapping sleeve and valve are first attached to the main and tested. Then the drilling machine, with a shell cutter attached to the boring bar, is attached to the tapping valve using an adapter. The assembly should be pressure tested prior to making the cut. 2. With the tapping valve open, the shell cutter and bor- ing bar are advanced to cut the main. 3. The boring bar is retracted and the tapping valve closed to contain the water pressure. 4. With the machine removed, the lateral is connected and the tapping valve opened to pressurize the lateral and place it in service. Large drilling machine selection guide Machine CL-12 ™ Tapping valve size range 2"-12" Maximum pressure 250 psig (1724 kPa) C-1-36-99002 Mega-Lite ™ 2"-24" 3"-12" 500 psig (3447 kPa) 250 psig (1724 kPa) Operation Hand or Power Hand or Power Hand or Power Recommended uses For making lateral connections or inserting valves under pressure