Water is found inside the receiver during inspection or drain-down, risking internal corrosion.
1
Automatic drain not functioning
CheckManually actuate drain valve and observe discharge.
FixService or replace drain (see condensate-solenoid-failure and drain-stuck flows).
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2
No aftercooler or undersized aftercooler upstream of tank
CheckMeasure air temperature entering the tank; compare to ambient.
FixAdd or upsize aftercooler so most moisture condenses upstream where it can be drained, not in the tank/piping.
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3
Tank drain manual valve left closed after service
CheckVerify valve position; check maintenance log.
FixOpen/verify auto-drain path; establish a manual daily-drain checklist as backup.
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4
Internal corrosion/pitting from prolonged water contact
criticalCheckHave the tank internally inspected per local pressure-vessel inspection requirements before returning to service.
FixRepair per code or replace the tank if corrosion compromises integrity — do not simply keep draining a corroding vessel.
SafetyA pressure vessel with significant internal corrosion is a rupture hazard; have it inspected by a qualified inspector.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.