How to deal with some problem of desicant air dryer (heatless type)

Tuesday - 30/07/2019 04:26
 
Problem  Probable cause Remedy
Exessive backpressure in regeneration tower (Above 0,5 barg) Silencer is clogged Clean or replace silencer
Presure gauge malfuntion Check or replace pressure gauge
Depressurization fail De-press valve & purge valve doesn’t open. Check the de-press &purge and check its solenoid valve
Silencer is clogged Clean or replace silencer
Low pressure Check control air pressure (above 5 barg)
Re-press fail De-press & purge valve doesn’t close Check the  de-press & purge valve and check its solenoid valve
Excessive press. Drop Excessive flow rate Check working pressure
Low inlet pressure Check line pressure
Tower change failure No control air low control press. Check control air line & control filter.
Controller failure Check the PLC or PCB controller
Elevated dew point

 
Insufficient purge air Check purge pressure (nor. 30-3.5 barg)
Silencer is clogged Check or replace silencer
Low pressure Check pressure source
High inlet temp Reduce inlet temp.Check after-cooler or ref.dryer
Desiccant contaminated by oil Install suitable pre-filter and replace desiccant
Water entering Check after-cooler or ref.dryer. If nescessary replace desiccant.

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