Samsung Electronics DVM Series Technical Manual page 192

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.
O
90
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)
1/4"
3/8"
1/2"
5/8"
3/4"
7/8"
5) Check that the flaring is correct, referring to the illustrations
below for examples of incorrect flaring.
Inclined Damaged Surface
6) Align the pipes and tighten the flare nuts first manually and
then with a wrench, applying the following torque.
Outer Diameter
1/4"
3/8"
1/2"
5/8"
3/4"
7/8"
In cases of welding the pipes, you must weld using nitrogen gas purging the pipework.
Oblique Rough
Depth (A)
1/16"
1/16"
1/16"
1/16"
1/16"
3/32"
Cracked Uneven Thickness
Torque (kgf•cm)
144~176
333~407
504~616
630~770
990~1210
990~1210
19
Burr