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20 Maintenance Basics – Tube
Tube leaks around the fitting can result from:
• Using pliers which can break internal seals and twist
the tube.
• Turning the fitting inside the tube when centering a
replacement tube or when connecting suction/discharge
lines.
• Using thread sealant tape which prevents ferrules from
seating into tube fitting.
• Stress on tube fitting from a tight radius in the
suction/discharge tubing.
• Crushed ferrules from over tightening or use of pliers.
Corrective Action
1. Finger tighten connecting nut. DO NOT use pliers.
DO NOT use thread sealant tape. Hold tube fitting when
tightening connecting nut to prevent fitting from turning.
2. Change ferrules with every tube change. Ferrules make the
seal between tube fitting and the connecting nut.