Cutting/Flaring the Pipes
Connect the pipe within 50m and cutting pieces will not be gone into
the pipe as being clean to pipe section.
1
Make sure that you have the required tools available
(pipe cutter, reamer, flaring 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.
Oblique Rough Burr
3
To prevent any gas from leaking out, remove all burrs at the cut edge of
the pipe, using a reamer.
4
Slide a flare nut on to the pipe and modify the flare.
Outer Diameter (D) Depth (A)
6.35 mm (1/4") 1.3mm
9.52 mm (3/8") 1.8mm
12.70 mm (1/2") 2.0mm
15.88 mm (5/8") 2.2mm
19.05 mm (3/4") 2.2mm
22.23 mm (7/8") 2.2mm
5
Check that the flaring is correct, referring to the illustrations below for
examples of incorrect flaring.
Inclined Damaged Surface Cracked Uneven Thickness
6
Align the pipes and tighten the flare nuts first manually and then with
a torque wrench, applying the following torque.
◆
In case of welding the pipe, you must weld with nitrogen gas blowing.
CAUTION
Outer Diameter Torque (kgf•cm)
6.35 mm (1/4") 140~170 kgf
•cm
9.52 mm (3/8") 250~280kgf
•cm
12.70 mm (1/2") 380~420kgf
•cm
15.88 mm (5/8") 440~480kgf
•cm
19.05 mm (3/4") 990~1210kgf
•cm
22.23 mm (7/8") 990~1210kgf
•cm
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