Dryer overload
Flow, inlet temperature or ambient condition exceeds design, worsening achievable dew point.
Compressed-air symptom
Water in the compressed-air system:
treat the cause, not the symptom.
Condensate forms when compressed air cools and can no longer retain all moisture as vapour. Dryer sizing, drains, bypass, pipework, peaks or cold sections can cause water at the consumer.
01 Why water appears
Compression heats air –
cooling releases water.
Ambient air contains water vapour. Compression raises the air temperature. As the air then cools through the aftercooler, receiver and pipework, it can hold less vapour and condensate forms. A working system separates and drains liquid water, then limits remaining vapour to the required pressure dew point.
Water at the user does not automatically prove a failed dryer. Inlet conditions, overload, bypass, drains, pipework, cold sections or an unsuitable target may be responsible.
02 Check route
From intake
to the affected consumer.
01
Compressor and cooler
Review intake, discharge temperature, aftercooler and water separation.
02
Receiver and drains
Check function, contamination, air loss and condensate path.
03
Filters and dryer
Check bypass, pressure drop, sizing, inlet temperature, load and dew-point indication.
04
Network and user
Review fall, low points, cold zones, ring main, drops and local ingress.
03 Common causes
Separate symptom
from cause.
Drain fault
Condensate is retained or an open drain wastes air. Both can impair operation.
Bypass open
Untreated air mixes into the network after filters or dryer.
Network colder than expected
Air cools below its moisture limit after the measurement point.
Load peak
A short high demand exceeds dryer or line capacity even when average flow seems normal.
Local ingress
Process, cleaning, a failed exchanger or backflow introduces water near the user.
04 Diagnostic data
Good troubleshooting needs
time and measurement point.
A reading after idle time may differ from the fault at full production.
- exact location of water
- when and in which operating state
- compressor, dryer and filter identification
- flow, pressure and inlet temperature
- displayed or measured pressure dew point and location
- bypass positions and drain condition
- last maintenance, change or new consumer
- ambient and production conditions
05 Common questions
Narrow the water issue
with evidence.
Why is there water despite a refrigerated dryer?
Overload, hot inlet air, a failed drain, open bypass, cold pipework or local ingress may be responsible. Check dew point under actual load and at the right point.
Will another filter solve it?
A filter can separate droplets or particles but does not remove all water vapour to a low dew point. First identify liquid water, aerosol or vapour.
Will a larger dryer solve it?
Only if undersizing or changed inlet conditions are the cause. Pipework, drains, bypass and measurement still need review.
How should the fault be documented?
Record time, user, production state, pressure, temperature, dew-point display, alarms and photos. Changes since the last fault-free period are particularly useful.
Next step
Does water keep returning?
Record location, time and operating state.
Nameplates, photos and available pressure, temperature or dew-point data help narrow the next check.