Understanding the Difference Between Water Vapor and Droplets
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Water Vapor dose not harm air driven machinery or controls, but water droplets, can ruin any operation. If an operation, such as spray painting. can be done on a day when there is 100% relative humidity. Then the water vapor in the air clearly does not interfere with the operation. But spray painting can not be done in the rain. Water droplets as rain in the air or in the compressed air definitely interferes with the poeration causing fisheyes, pinholes, and blisters. Every day around the word pneumatic operations are being performed and air tools, equipment and instruments are being run by compressed air which is full of water droplets, corrosive oil droplets, and dirt particles.
How Much Water Is There
The saturation point of air at 80 degrees Fahrenheit
and standard pressure is called 100% relative humidity.
At this temperature and pressure, 100% relative humidity
means that one cubic foot of air contains 10.934 grains
of water. When we compress that air to 150 pis we need
about 10.5 cubic feet at standard temperature and pressure
to equal 1 cubic foot compressed to 150 psi.
(10.5 〜 14.7 psi = 154.25 psi).
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