Hot water for domestic use : a complete guide to the methods of supplying and heating water for domestic purposes, giving each step to be taken and explaining why it is done . jected to an absolute pressure of 46pounds per square inch, would expand in volumeto 563 times the bulk of the original pound ofwater. Pressure of Water 43 Pressure of Water. In dealing with water pressures, it is well toknow just what is meant by the various are two kinds of pressures used in hydrau-lics, gauge pressure and absolute pressure. It iswell known that the atmosphere exerts, or is sub-jected to a
Hot water for domestic use : a complete guide to the methods of supplying and heating water for domestic purposes, giving each step to be taken and explaining why it is done . jected to an absolute pressure of 46pounds per square inch, would expand in volumeto 563 times the bulk of the original pound ofwater. Pressure of Water 43 Pressure of Water. In dealing with water pressures, it is well toknow just what is meant by the various are two kinds of pressures used in hydrau-lics, gauge pressure and absolute pressure. It iswell known that the atmosphere exerts, or is sub-jected to a pressure of approximately poundsper square inch, and when pressure is calculatedfrom the zero pressure of atmosphere, the pressureis absolute; and the ordinary atmospheric pressure,everything is subjected to, is rated at poundsper square inch. Ordinarily, however, the pressure of the atmos-phere is ignored,and pressurereadings aretaken from point,which is consid-ered zero. Thusit is that thegauge pressuretakes no accountof the pressureof the atmos-phere, andgauges indicate only the additional pressure aboveatmospheric. To find the absolute pressure of. Fig. 44 Hot Water for Domestic Use water, therefore, when gauge pressure is given,add pounds to the readings of the gauge. Whenabsolute pressures are given they can be convertedinto gauge pressures by substracting poundsfrom the absolute pressure. The pressure of water in closed systems is gen-erally indicated by means of a pressure construction and principle of operation of apressure gauge can be seen in Fig. 8. The dialface has been removed in this illustration to showthe interior construction and operation of the ap-paratus. The construction of the gauge is as fol-lows: A bent tube a of elliptical cross-section,made of a suitable metal of the required elasticity,has its bottom end firmly attached to the gaugecase and its upper end free to move. To the upperend is attached a lever, b, which
Size: 1518px × 1647px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidhotwaterford, bookyear1910
