Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . jri m i 1 —*«* jiiiil i J^ ;:<3iM im. Sffli|«l|l§l ti iitiia ^ :i f PHANTOM VIEW OF MARSH INDEPENDENT STEAM PUMP. eter, and the square root of = So, theo-retically, the size of the water end of the pump wouldbe 3^ in. in diameter by 5 in. stroke; but as it isalways safer to have a reserve of pumping capacity,the proper size of the pump would be 3^ in. in diam-eter by 5 in. stroke, with a steam cylinder of 6 or 7 diameter. There is another rule for ascertaining the
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . jri m i 1 —*«* jiiiil i J^ ;:<3iM im. Sffli|«l|l§l ti iitiia ^ :i f PHANTOM VIEW OF MARSH INDEPENDENT STEAM PUMP. eter, and the square root of = So, theo-retically, the size of the water end of the pump wouldbe 3^ in. in diameter by 5 in. stroke; but as it isalways safer to have a reserve of pumping capacity,the proper size of the pump would be 3^ in. in diam-eter by 5 in. stroke, with a steam cylinder of 6 or 7 diameter. There is another rule for ascertaining the size of the BOILER SETTINGS AND APPURTENANCES 51 feed pump, by taking the number of square feet ofheating surface in the boiler and allow a pump capacityof I cu. ft. per hour for each 15 sq. ft. of heating sur-face. Thus, let the total heating surface of the boilerbe 786 sq. ft. Dividing this by 15 gives as thenumber of cubic feet of water required per hour, fromwhich the pump dimensions may be found in the sameway as in the preceding case. In figuring on the capacity of a feed pump for a bat-tery of two or more bo
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