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Si33-102.book Page 22 Tuesday, June 26, 2001 3:18 PM
Installation
Flare Connection (a) Stiffened pipe must always be annealed at least once prior to the flaring work.
(b) A pipe cutter must be used to cut the pipe. (A large pipe cutter must be used where the pipe has a large
diameter. When cutting a pipe which is too big for the pipe cutter a metal saw may be used but care
must be taken to ensure that the debris from sawing does not get into the pipe.)
(c) Set the flaring tool to make sure the flare size remains within the prescribed limits.
Nominal diameter
3/8B
1/2B
5/8B
3/4B
(d) Coat the inner and outer surface of the flare with refrigerator oil (Ester or ether oil). (this ensures that
the flare nut passes smoothly, preventing the pipe from twisting.)
Do not use SUNISO-4GS oil.
Important points
1. Burrs should be carefully removed.
2. 2 spanners should be used to grip the pipe.
3. The flare nut must be inserted before starting the flaring operation.
4. The appropriate amount of torque should be used to tighten the flare nut.
Standard torques for tightening flare nut
Size
1/4(6.4φ)
3/8(9.5φ)
1/2(12.7φ)
5/8(15.9φ)
3/4(19.1φ)
5. Check that there is no superficial damage to the surface of the flare.
22
External diamenter of pipe d Pipe widening dimensions A
9.53 12.2~12.8
12.7 15.6~16.2
15.88 18.8~19.4
19.05 23.1~23.7
± 10%
Torque
(kgf-cm) (N-cm)
144~176 1420~1720
333~407 3270~3990
504~616 4950~6030
630~770 6180~7540
990~1210 9270~11860

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SiE33-102
General Information