Installation SiE33-102
22 General Information
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.
(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.
5. Check that there is no superficial damage to the surface of the flare.
Nominal diameter External diamenter of pipe d Pipe widening dimensions A
3/8B 9.53 12.2~12.8
1/2B 12.7 15.6~16.2
5/8B 15.88 18.8~19.4
3/4B 19.05 23.1~23.7
Standard torques for tightening flare nut
±10%
Size
Torque
(kgf-cm) (N-cm)
1/4(6.4φ) 144~176 1420~1720
3/8(9.5φ) 333~407 3270~3990
1/2(12.7φ) 504~616 4950~6030
5/8(15.9φ) 630~770 6180~7540
3/4(19.1φ) 990~1210 9270~11860
Si33-102.book Page 22 Tuesday, June 26, 2001 3:18 PM
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