SiE33-003
Before Operation
Installation Manual
161
FLARE SHAPE and FLARENUT TIGHTENING TORQUE
Not recommendable but in case of emergency
You must use a torque wrench but if you are obliged to install the unit without a torque wrench, you may
follow the installation method mentioned below.
After the work is finished, make sure to check that there is no gas leak.
When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten the flare nut the angle shown below:
Pipe Size
Tightening Torque (N·m)
A (mm)
Flare Shape
φ
6.4
14.2-17.2
8.3-8.7
φ
9.5
32.7-39.9
12.0-12.4
φ
12.7
49.5-60.3
15.4-15.8
φ
15.9
61.8-75.4
18.6-19.0
φ
19.1
97.2-118.6
22.9-23.3
Pipe size
Further tightening angle
Recommended arm length of tool
6.4 (1/4”)
60 to 90 degrees
Approx. 150mm
9.5 (3/8”)
60 to 90 degrees
Approx. 200mm
12.7 (1/2”)
30 to 60 degrees
Approx. 250mm
15.9 (5/8”)
30 to 60 degrees
Approx. 300mm
19.1 (3/4”)
20 to 35 degrees
Approx. 450mm
R=0.4 0.8
45 ±
90 ±
A
4
2
(V0905)
Torque wrench
Piping union
Flare nut
Spanner
(V1348)
Si33-003.book Page 161 Monday, June 25, 2001 9:06 AM
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