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