Canadian engineer . n=^ E -WATER. Kig. 2.—Return-Air Displacement System. and one for water; these pipes run down inside of the welland are submerged for a certain depth proportionate to thelift when the pump is at work. Fig 3 shows the differentmethods of piping wells. All wells are not alike, there-fore it is a special problem in every case to determine thesize and arrangement best suited. Each method here shown has its use, depending uponthe diameter and depth of the well, whether the well iscased or not^ the lift, volume of water to be pumped, andcharacter of the water-bearing strata. The
Canadian engineer . n=^ E -WATER. Kig. 2.—Return-Air Displacement System. and one for water; these pipes run down inside of the welland are submerged for a certain depth proportionate to thelift when the pump is at work. Fig 3 shows the differentmethods of piping wells. All wells are not alike, there-fore it is a special problem in every case to determine thesize and arrangement best suited. Each method here shown has its use, depending uponthe diameter and depth of the well, whether the well iscased or not^ the lift, volume of water to be pumped, andcharacter of the water-bearing strata. The arrangementmost generally used, where conditions permit, is shown inNo. I, Fig. 3. This is the Pohle or side-inlet method,in which the discharge and air pipes are placed side by sidein the well, joined by a suitable foot-piece. In No. 2, Fig. 3, compressed air fills the annular spacesurrounding the up-take pipe and is free to enter the risingcolumn at all points of its periphery, at the same time act-ing without obstructing or
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