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Cutting/Flaring the Pipes
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.
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.
5) Check that the flaring is correct, referring to the illustrations
below for examples of incorrect flaring.
6) Align the pipes and tighten the flare nuts first manually and
then with a wrench, applying the following torque.
Outer Diameter Torque (kgf•cm)
6.35 mm (1/4") 144~176
9.52 mm (3/8") 333~407
12.70 mm (1/2") 504~616
15.88 mm (5/8") 630~770
19.05 mm (3/4") 990~1210
22.23 mm (7/8") 990~1210
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
◆
In case of welding the pipe, you must weld with nitrogen gas blowing.
DVM E-D/B(chapter5)-E<03759 3/21/02 7:40 PM Page 19