321037
70
Step 11:
Allow the pipe circuit under test to sit on drop off test. This could take a number of days for a
result.
NOTE: In some cases a leak may not be found by pressurising the circuit, whereas a vacuum
pulled on the same circuit will show the leak. Keep this in mind, as oil within the circuit can block a
hole.
In some cases, if the brazed joint is warmed while under pressure, this can thin the oil and help to
expose the leak. A heat gun or hair dryer is useful.
Diagram
13
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