Show the and the com compressor BY A MAN WHO KNOWS frank richards compressed air expert says that the entire responsibility for the economy and practical success of two stage compression rests with the compressed air magazine april 1917 A few ew facts to be remembered from tests made by one of tile the large smelling smelting sm elting companies in tile the state of utah at an elevation of feet above sea level to determine tile the amount of water contained in atmospheric air under different barometric conditions every day for a period of many months it was found that the smallest quantity of water contained in the air at any test was of a pound to every pound of air the temperature of the air was 65 degrees F and the humidity 8 per cent As there are thirteen cubic feet of air in one pound at this temperature there would would be of a pound of water in every 1000 cubic feet of air taken into the low pressure cylinder of the compressor in the drnest weather known in the district in question hiscock kent and other authorities tell us that the water alone in one cubic foot of saturated air at a temperature of 62 de grees weighs of a pound this means that you have 88 of a pound of water in every 1000 cubic feet feel of air which is taken into the low pressure cylinder of the compressor in wet weather the same authorities tell us that at a temperature of 62 degrees the elastic or expansive force of tile the water in the air is only of an inch of mercury while the elastic or expensive force of the air alone in the mixture is of an inch but as the temperature is raised the conditions reverse and at del degrees I 1 grees the expansive force of water in the air is inches of mercury while the expansive force of the ar air in the mixture is or nir nil or in ill other words the expansive force of tile the air in the mixture is due entirely to the pressure at the temperature we have to contend with in ill the air compressor while the expansive force of the water in ill the mixture is due to the heat and at degrees temperature and atmospheric pressure one cubic inch of water will expand into 1642 cubic inches of steam gas As the temperature of the air and i water entering the of the compressor assor is anywhere from to degrees it should be very plain to anyone who will give the matter a little thought why it is necessary for the inter cool ler to remove as much of the water from the air as is possible with a minimum amount of coolin cooling water especially plain does this become when we remember daltons dalfons Dal tons laws of gases which tells us that in any combination of gases in a vessel or cylinder each gas exerts its own owl pressure independently of any other gas then the cost of compress mg 19 the steam gas which is generated from the water in the air in the high pressure cylinder is not only lost by condensation in the pipe line but the volume of workable air which we would otherwise have if there were nothing to condense in the pipe line is also lost it is a well known fact also that the hot wet air is the direct cause of 1 the carbonization or baking of the oil in the high pressure valves causing them to leak and very often to break the which removes the greatest amount of water itom irom the air before it enters the high pressure cylinder of the compressor is therefore the best one to use very often users of compressed air discard their old compressors and install new ones when if they would only give the a little attention they could save their money |