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29
A
Cutting/Flaring the pipes
1. Make sure that you have the required tools available. (pipe cutter, reamer, aring tool and pipe holder)
2. If you wish to shorten the pipes, cut it with a pipe cutter, taking care to ensure that the cut edge remains at a 90° angle
with the side of the pipe. Refer to the illustrations below for examples of edges cut correctly and incorrectly.
3. To prevent any gas from leaking out, remove all burrs at the cut edge of the pipe, using a reamer.
4. Slide a are nut on to the pipe and modify the are.
5. Check that the flaring is correct, referring to the illustrations below for examples of incorrect flaring.
• IfthepipesrequirebrazingensurethatOFN(OxygenFreeNitrogen)isowingthroughthesystem.
• Nitrogenblowingpressurerangeis0.02~0.05MPa.
Oblique Rough
Burr
Pipe
cutter
Pipe
Outer Diameter (D) Depth (A)
ø6.35 mm 1.3 mm
ø9.52 mm 1.8 mm
ø12.70 mm 2.0 mm
ø15.88 mm 2.2 mm
ø19.05 mm 2.2 mm
Pipe
Flare
Uneven
Thickness
CrackedDamaged
Surface
InclinedCorrect
Outer diameter (D,mm)
Connection torque (N
·
m)
Flare dimension (L,mm) Flare shape (mm)
Ø 6.35 14~18 8.7~9.1
90° ±2°
45° ±2°
R 0.4~0.8
Ø 9.52 34~42 12.8~13.2
Ø 12.70 49~61 16.2~16.6
Ø 15.88 68~82 19.3~19.7
Ø 19.05 100~120 23.6~24.0
CAUTION
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