Troubleshooting

   

Troubleshooting Compressed Air Systems
Problem Probable Cause Remedial Action  
Low pressure at point of use Leaks in distribution piping Check lines, connections and valves for leaks  
  Clogged filter elements Clean or replace filter elements  
  Fouled dryer heat exchanger Clean heat exchanger  
  Low pressure at compressor discharge See below  
Low pressure at compressor discharge For systems with modulating load controls, improper adjustment of air capacity system Follow manufacturer's recommendation for adjustment of air capacity system  
  Worn or broken valves Check valves and repair or replace as required  
  Improper air pressure switch setting Follow manufacturer's recommendations for setting air pressure switch  
Water in lines Failed condensate traps Clean, repair, or replace the trap  
  Failed or undersized compressed air dryer Repair or replace dryer  
Liquid oil in air lines Faulty air/oil separation Check air/oil separation system; change separator element  
  Compressor oil level too high Follow manufacturer's recommendation for proper oil level  
Dirt, rust or scale in air lines In the absence of liquid water, normal aging of the air lines Install filters at point of use  
Excessive service to load/hour ratio System idling too much For multiple compressor system: consider sequencing controls to minimize compressor idle time  
    Adjust idle time according to manufacturer's recommendations  
  Improper pressure switch setting Readjust according to manufacturer's recommendations  
Elevated compressor temperature Restricted air flow Clean cooler exterior and check inlet filter mats  
  Restricted water flow Check water flow, pressure, and quality; clean heat exchanger as needed  
  Low oil level Check compressor oil level, add oil as required  
  Restricted oil flow Remove restriction, replace parts as required  
  Excessive ambient temperature Improper ventilation to compressor; check with manufacturer to determine maximum operating temperature  

 

 

Table is based on 100% coefficient of flow. For well rounded entrance, multiply values by 0.97. For sharp edge orifices, a multiplier of 0.65 may be used. This table will give approximate results only. The formula Q=14.5 PD2, where Q is CFM, P is absolute pressure and D is orifice diameter in inches, may be used for any points not given in table. (Applies only above 15 pounds gauge.)

 

Please contact us for information or a quote if you need a reciprocating or rotary screw air compressor, refrigerated or desiccant air dryer, roots-type blower, vacuum pump, plant air system audit, or any compressed air product or service.