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Old 01-18-2009, 07:59 AM
oldred oldred is offline
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If that compressor is bleeding down to zero (or nearly so) every night you should find out why and stop it, probably a simple shut-off valve at the tank will do it. Having to refill a compressor tank from zero every day puts a tremendous amount of unnecessary wear on the pump because of the long run time and heat build-up, occasionally dropping the tank to near zero will not not hurt anything but it adds up fast. If this happens, for example, 250 days out of a year and takes 7 minutes to refill from empty that is about 29 hours of wasted hard run time per year not to mention the wasted power. The bigger problem though is the fact that the tank has to expand and contract through each of these cycles which will greatly shorten it's service life and as old as yours is it likely will not have a lot of time left anyway so you need to go easy on it. Most people don't realize that a tank undergoes expansion and contraction during discharge/recharge but it does, not much during the normal discharge/recharge cycle but all the way down to zero and than back up to pressure causes a lot of expansion/contraction which will eventually lead to tank failure due to metal fatigue. Obviously letting the tank drain to zero is a REALLY bad idea and you really need to address this problem as soon as possible, especially considering how old that compressor is.
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