Figure 3-42.Methods of measuring pipe and tubing.
After cutting the copper, remove the burr inside
the cut with the reamer on the tubing cutter. Place the
reamer in the end of the copper, and revolve the tubing
cutter clockwise until the burr is removed.
JOINING. When working with copper, you use
both flared and sweated joints. Flaring is a method
of forming the end of the copper into a funnel shape, so
Figure 3-43.Cutting and reaming copper tubing.
it can be held in a threaded fitting when a line joint is
being made. Before a flare is made, slip a flare nut on
the copper. A common error is forgetting to put the nut
on before making the flare. For additional information
on making flared connections, refer to Use and Care of
Hand Tools and Measuring Tools, NAVEDTRA
12085. Figure 3-44 shows a few typical copper fittings.
A sweated joint is made with solder instead of
threads or flares. When making a soldered joint with a
sweat fitting, clean an inch or more of the end of the
copper tubing with steel wool or 000 sandpaper until
new metal appears. Clean the inside of the fitting in the
same manner. Spread a thin film of paste flux on the
tube end with a clean brush or applicator. Do not apply
paste with your finger or an oily applicator.
Carefully insert the copper into the fitting to make
them fit together very closely. Capillary action must
spread the solder evenly and completely over the
surfaces; however, the process is not effective with
loose fits because of excess clearance. If the fit is loose,
you may have to tin the end of the copper tube.