. Journal of electricity, power, and gas . ce wtiile receiving little, and oftenunskilled, attention. For this reason the simple direct-actingpump has long held the field, in spite of its many short-comings such as an enormous steam consumption, tendencyto produce shock and vibration, unsuitability for close regula-tion, numerous valves, etc. The centrifugal boiler feeder, which has lately beentaken up by several of the largest steam power plants in theUnited States, is free of these defects and possesses severalimportant advantages in addition. It does not endanger thepipe line by vibration,
. Journal of electricity, power, and gas . ce wtiile receiving little, and oftenunskilled, attention. For this reason the simple direct-actingpump has long held the field, in spite of its many short-comings such as an enormous steam consumption, tendencyto produce shock and vibration, unsuitability for close regula-tion, numerous valves, etc. The centrifugal boiler feeder, which has lately beentaken up by several of the largest steam power plants in theUnited States, is free of these defects and possesses severalimportant advantages in addition. It does not endanger thepipe line by vibration, by excessive pressure, nor by inflow of water can be regulated at the boiler without ref-erence to the pump. A centrifugal boiler feed pump con-tains no valves and only two packings, of quite small diam-eter, to be kept tight against hot water. There is no dangerof breakage of pistons, cylinder heads or iiacking ringsthrough loss of suction and consequent pounding. The ad-herents of the direct acting pump have asserted that with. Turbine Driven Centrifutjal Boiler Feed Pump. the i)ump in motion the operator can always be sure thatwater is going into the boiler, but this supposed advantagedoes not obtain where one or more pumps are feeding severalboilers and, moreover, it is quite possible for a piston pumpwith one valve displaced to run steadily without forcingwater into the boiler. One thing that has retarded the introduction of thecentrifugal boiler feed pump is the fact that it is not suitedto reciprocating engine drive, as the comparatively low speedof the latter makes necessary a large number of stages inorder to obtain the high heads required to overcome modernboiler pressure and if an attempt is made to keep down thenumber of stages by making the impeller large in diameter,the efficiency is seriously reduced. However, if the luimpis to be driven by a steam turbine or electric motor this be-comes an advantage. For instance, the impellers of the two-stage steam t
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
