Show How YOU Can SAVE YOUR COAL r T t HOSE who would would keep their coal bills do doand down THOSE T I and yet feed the furnace well may gain much information from a recent address of Dr E. E H. H director of the Mellon Institute Institute Institute tute of Industrial Research Pittsburgh who spoke before the Philadelphia Section of bf th thAm the Am American rican Chemical Society Society- Dr said that economy In fuel was of the greatest importance importance importance im im- especially In the large service power plants and the industrial establishments and in office buildings It Is recognized generally he said that the losses of heat fr from m bare pipes and boilers bollers are considerable considerable con con- considerable yet their real magnitude is little The fact that the loss from 1000 square feet of exposed surface at pounds per square inch in steam i pressure represents more than tons of coal annually is a sufficient justification for the serious consideration of this subject The value of a good non-heat-conducting non cover should therefore not be overlooked One of these covers composed of 85 per cent of magnesium carbonate and of 15 per cent of asbestos introduced as a binder has been found very efficient according to a recently completed report by the Mellon Institute Practical experiments have been made in ad addition addition addition ad- ad to the laboratory tests said Dr In one Instance there were two boilers in the plant of 80 and horsepower 60 locomotive type Their total exposed surface amounted to square feet The calculated saving based on the laboratory experiments was 1500 pounds of coal per day while the actual test produced a saving of 1700 pounds of coal per day This saving amounted to 15 per cent of the coal burned due to covering the boiler alone as the pipe lines were not included in the test With 85 per cent magnesia covering the result desired is the maximum net saving for any given condition If the covering cost were nothing nothing noth noth- ing th the proper thickness would be limited only by the requirements of space available for each increased thickness would result in some slight increased saving in heat In a practical case casa where the covering has a definite cost a point is reached where the increased cost of the covering will vill be greater than the additional saving in heat affected It is this point in which which the the users of coverings are most interested for it defines the maximum net saving to be accomplished The use of the proper thickness of covering will result In a saving which will repay the original cost ost of the installation in less than a year in practically every case and under constant operation at high temperatures where great thickness is called for the saving will vill often pay for the installation in as short a two months |