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5) Use the reducing valve to adjust the nitrogen
gas flow speed to 0.05 m
3
/hour or 0.02 MPa
(0.2 kgf/cm
2
).
6) After the steps above, keep the nitrogen gas
flowing until the pipe cools down to a certain
extent. (Temperature where the pipe is cool
enough to be touched by hands)
7) Remove the flux completely after brazing.
Fig 2-5-1
Prevention of oxidation during brazing
M
Flow meter
Stop valve
From nitrogen cylinder
Nitrogen gas
Robber plug
Pipe
Nitrogen gas cylinder
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 14 Monday, October 5, 2009 2:09 PM