1.4 0 10 20 30 40 50 0 10 20 30 40 50 0 10 20 30 40 50 THE PROBLEM -In this examp le the compressorun time is normally25% as illus tratedin (A); however,the run time has incr easedto 50% as illu strated in B( ) and (C). The exces siverun time wastes energy,shortens the compr essor life expectan cyand increas es theprobability of gettin goil into the controlsystem. THE QUE STION -Is the excessiverun time the symptom foa leak in the control system oar decrease inthe compressor performan ce? Bothconditions create thesame symp tom at thecomp ressor. THE ANAL YSIS -The flow meter in scenario (A) indicates that the system normally consumes 20 CFH (Cubic Feet Per Hour) of air, at a compressor run time of 25%, which you initially recorded when you installed the meter. -If (B) illustrates your current situation with the flow meter reading 40 CFH, at a compressor run time of 50%, you know that the problem is a leak in the control system as it normally should only consume 20 CFH. -If (C) illustrates your current situation with the flow meter reading 20 CFH, at a compressor run time of 50% you know there is a problem with your compressor station as the control system is consuming its normal 20 CFH. 9-165 ASSESSING EXCESSIVE COMPRESSOR RUN TIME FLOW METER FLOW METER FLOW METER DELTECH PRV RELIEF FILTER VALVE DELTECH PRV RELIEF FILTER VALVE DELTECH PRV RELIEF FILTER VALVE NO NC NO AIR DRYER NO NC NO AIR DRYER NO NC NO AIR DRYER PREFILTER PREFILTER PREFILTER COALESCING FILTER COALESCING FILTER COALESCING FILTER (A) (B) (C) COMPRESSOR RUN TIME 25% COMPRESSOR RUN TIME 50% COMPRESSOR RUN TIME 50% COMPRESSOR COMPRESSOR COMPRESSOR TO SYSTEM NORMAL OPERATION NO LEAKS TO SYSTEM NORMAL OPERATION BLOWN VALVE DIAPHRAGM TO SYSTEM NORMAL OPERATION NO LEAKS SYSTEM CONSUMING 20 SCFH COMPRESSED AIR SYSTEM CONSUMING 40 SCFH COMPRESSED AIR SYSTEM CONSUMING 20 SCFH COMPRESSED AIR FIGURE B
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