1 hvacr316 - piping cutting and swaging tubing. 2 cutting tubing tubing is normally cut with a tube...
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HVACR316 - Piping
Cutting and Swaging Tubing
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Cutting Tubing
• Tubing is normally cut with a tube cutter. The tube cutter is most often used with soft drawn and smaller diameter hard drawn tubing.
• A hacksaw may be used with larger diameter hard drawn tubing.
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Cutting Tubing With Tube Cutter
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Cutting Tubing With Hacksaw
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Cutting Tubing
• Procedure for Using Tube Cutter:− Place a mark on the tube where it is to be
cut.− Place the tubing in the cutter and align the
cutting wheel with the mark on the tube.− Tighten the adjusting screw handle until a
moderate pressure is applied to the tubing.
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Cutting Tubing
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Cutting Tubing
• Procedure for Using Tube Cutter, Cont’d.− Revolve the cutter around the tubing,
keeping a moderate pressure applied to the tubing by gradually turning the adjusting handle.
− Do not apply excessive pressure, because it may break the cutter wheel and constrict the opening in the tubing
− Continue until the tubing is cut.
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Cutting Tubing
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Cutting Tubing
• When the cut is finished, the excess material (called a burr) that was pushed into the pipe by the cutter wheel must be removed.
• Burrs cause turbulence and restrict the flow of fluid or vapor passing through the pipe.
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Cutting Tubing
• The reamer, located on the back of the tubing cutter, is used to remove the burrs caused by the cutting process.
• The reamer should be pivoted from the back of the cutter so that the blade portion extends past the cutter.
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Cutting Tubing
• The reamer is inserted into the pipe and while applying pressure, is rotated to remove any burrs from the interior of the pipe.
• Any burrs on the outside of the pipe can be removed with the file portion of the reamer.
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Cutting Tubing – Reaming Tool
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Cutting Tubing With Hacksaw
• Procedure for Using Hacksaw:−Make the cut at a 90° angle to the tubing.−A fixture may be used to ensure an
accurate cut.−After cutting, ream the tubing and file the
end of the tube−Remove all chips and filings, making sure
that no debris or metal particles get into the tube.
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Using a Hacksaw
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Swaging - Overview
• Swaging is the process by which two pieces of soft drawn copper tubing with the same diameter can be joined together by stretching the end of one of the sections.
• Hard drawn tubing is not intended to be swaged.
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Swaged Tubing
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Swaging
• Procedure for Swaging:−Locate the proper hole in the flaring block.• The proper hole is marked with the
measurement that corresponds to the outside diameter of the tubing.
−Insert the section of the soft drawn tubing to be swaged into the proper hole in the flaring block, so that the tubing extends a distance equal to the diameter of the tube plus about 1/8 of an inch.
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Swaging
• Procedure for Swaging, Cont’d:−Make certain that the end of the tube to be
swaged protrudes from the side of the block that has the beveled edge.
−Tighten the flaring block around the tubing.−Apply pressure and tighten the wing nuts
equally to ensure that the two pieces of the block secure the tubing evenly.
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Swaging
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Swaging
• Procedure for Swaging, Cont’d.• Place a drop of refrigeration oil on the
swaging tool to reduce friction between the swaging tool and the tubing.
• Insert the swaging tool into the tubing and strike the swaging tool firmly with a hammer.
• Rotate the flaring block ½ turn and strike the swaging tool again.
• Repeat the previous step until the swage has reached a length approximately equal to the diameter of the tubing.
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Swaging Tool
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Swaging Tool With Hammer
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Swaging
• After swaging, always inspect the tubing for cracks or defects of any kind.
• If any are seen or even suspected, cut off the swage and start over.
• If there are no defects, assemble the joint; the tubing should fit together easily.
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Successful Swaging Results