John, the maintenance manager of a wood products company, was very proud of his Number 3 compressor. It has been operating for years, racking up more than 200,000 run hours — and was so trouble free, it was almost scary. Of course, John kept it maintained, changing oil and filters on a regular basis, fixing […]

A large industrial plant fell on hard times and had to reduce their production shifts to only 8 hours per day, 5 days per week. The compressed air system remained running full time 24 hours a day, including weekends, due to the need to supply the plant’s dry fire system with air pressure. The total […]

What should you do when it comes time to decide if you should repair or replace your aging air compressor? There are a few things you should consider. Air compressors are like motor vehicles — if they are used continuously, hardly shutting down, they should not be expected to run for a long time without […]

Question: My compressed air dryer is rated at 100° F inlet air temperature. What will happen if the air temperature is lower than this? Answer: Having the air temperature lower than the dryer rating is a good thing. Actually, dryers are commonly rated at 100° F inlet temperature, 100 psi and 100° F ambient temperature. […]

Running out of pressure? Think about storage volume. Consider this — remember when you had your 10-speed bike with those thin tires? You could ride quite fast, but when it came to filling up the tubes to the proper pressure, all it took was a small shot on the fill valve to change the pressure […]

Question: I’m a compressor salesperson. Lately, the large building tenders we’ve seen have been spec’d for two variable speed screw compressors to run together sharing the load. This would make sense to me if one was a 100% backup and they never ran together, but that does not seem to be the case. Everything I’ve […]

A large industrial company was having problems with its air quality.  Water was appearing as if at random at one of its most critical processes, causing instrumentation failures and contamination of the product.  This issue was difficult to understand because it looked like the refrigerated air dryer was working fine — and dewpoint looked good […]

As compressors age, there can be internal wear or control problems that affect the flow output capacity. Often times, observing the amps of the compressor — and comparing that to the motor nameplate — can show if a compressor has problems. If the amps are low, that usually means the compressor flow capacity is lower […]

There is an old saying about a man with two watches who never knows what time it is. One wonders if this applies to having two flow meters? Fig. 1 shows the comparison of two thermal mass flow meters measuring the same compressed air stream. We can see there is a disparity between the readings, […]