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Cutting/Flaring the Pipes
10
E-
Make sure that you have the required tools available (pipe cutter, reamer,
1
flaring tool and pipe holder).
If you wish to shorten the pipes, cut it with a pipe cutter, taking care to ensure
2
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.
90
O
To prevent any gas from leaking out, remove all burrs at the cut edge of the
3
pipe, using a reamer.
Slide a flare nut on to the pipe and modify the flare.
4
Outer Diameter (D)
6.35 mm (1/4")
9.52 mm (3/8")
12.70 mm (1/2")
15.88 mm (5/8")
19.05 mm (3/4")
22.23 mm (7/8")
Check that the flaring is correct, referring to the illustrations below for
5
examples of incorrect flaring.
Inclined
Damaged Surface
Align the pipes and tighten the flare nuts first manually and then with
6
a torque wrench, applying the following torque.
Outer Diameter
6.35 mm (1/4")
9.52 mm (3/8")
12.70 mm (1/2")
15.88 mm (5/8")
19.05 mm (3/4")
22.23 mm (7/8")
CAUTION
In case of welding the pipe, you must weld with nitrogen
gas blowing.
Oblique
Rough
Depth (A)
1.3mm
1.8mm
2.0mm
2.2mm
2.2mm
2.2mm
Cracked
Torque (kgf•cm)
140~170
250~280
380~420
440~480
990~1210
990~1210
Burr
Uneven Thickness
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