1
Rust and scale sludge plugging the drain port
medCheckIsolate, depressurise to 0 PSI, then remove and inspect the drain strainer and port.
FixClean the strainer and port; add a Y-strainer ahead of the drain and service it on the PM schedule.
SafetyBleed the receiver to 0 PSI at a gauge before opening any drain fitting.
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2
Discharge line run uphill or too long
lowCheckFollow the drain tubing to its termination and check for rises, kinks and shared headers.
FixRe-route with continuous fall to an open, vented termination sized for the flow.
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3
Oil/water separator media saturated and backing up
medCheckCheck media colour and the separator's inlet level; note the last change date.
FixReplace the media; size the unit to the actual condensate load.
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4
Frozen drain line
medCheckFeel for ice at exposed runs during cold weather.
FixHeat trace and insulate, or relocate indoors.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.