3.\x2 Shaded area indicates change Rev. 8-04 MUELLER ® LARGE DRILLING MACHINES The MUELLER method for making a lateral connection (MUELLER ® CL-12 " Drilling Machine shown) 2 With the tapping valve open, the shell cutter and boring bar are advanced to cut the main. 1 The tapping sleeve and valve are rst 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. 3 The boring bar is retracted and the tapping valve closed to contain the water pressure.
Largedrillingmachineselectionguide MachineTappingvalvesize range MaximumpressureOperationRecommendeduses CL-12 TM 2"-12"250psig(1724kPa)HandorpowerFormakinglateralconnections orinsertingvalvesunderpres- sure C1-36-990022"-24"500psig(3447kPa)Handorpower operation, training operators to use them is an easy task. These machines are part o$ a complete selection o$ equipment, products and methods developed by MUELLER CO. to per$orm the variety o$ operations needed to install, extend and maintain today 9s wa- ter systems.
The designed-in compatibility o$ each part o$ the MUELLER selection helps everything go together easily $or strong, leak-tight installations. MUELLER methods and equipment let you work on pressurized water mains without interrupting fow. 4 With the machine removed, the lateral is ... more. less.
connected and the tap- ping valve opened to pressurize the lateral and place it in service.<br><br> Large Drilling Machines are used $or making 2" to 24" lateral connections on water mains under pres- sure. These machines are available with the tools and accessories $or cutting a wide variety o$ pipe. These large drilling machines are built to take the hard use and rough handling that is unavoidable when working on mains.<br><br> They need only minimum maintenance to provide long li$e and satis$actory use. The various drilling machines are simple to operate and, because they are similar in design and