. Principles and practice of plumbing . CTORS.—Air ejectors are nowmore generally used for sewage ejectment than any othertype of apparatus. They are automatic and almost noise-less in operation, are perfectly odorless, and have but fewworking parts than can get out of order. A type of com-pressed air ejector known as the Shone, is illustrated inFig. 58. Sewage flows into the chamber a through thehouse drain b. As the chamber fills with sewage it raises Digitized by Microsoft® Principles and Practice of Plumbing 107 the bucket c until it reaches a certain level, when by meansof the rod d, it o
. Principles and practice of plumbing . CTORS.—Air ejectors are nowmore generally used for sewage ejectment than any othertype of apparatus. They are automatic and almost noise-less in operation, are perfectly odorless, and have but fewworking parts than can get out of order. A type of com-pressed air ejector known as the Shone, is illustrated inFig. 58. Sewage flows into the chamber a through thehouse drain b. As the chamber fills with sewage it raises Digitized by Microsoft® Principles and Practice of Plumbing 107 the bucket c until it reaches a certain level, when by meansof the rod d, it opens valve e, thus admitting compressedair to chamber a. The pressure of air closes the checkvalve / through which sewage entered the chamber andopens check valve g through which it forces the contents ofthe sump into the street sewer. As the sewage level in thesump falls, the bucket float, which remains full of sewage,lowers with the contents until it reaches a point near thebottom of the chamber, when it closes the air valve, thus. Fig. 58(•(iminisscil Air Sewage Ejector shutting off the supply of compressed air, and at the sametime opening a vent through which the confined air canescape to a vent stack. Valve h is placed in the house drainpipe to the tank, and valve i in the discharge pipe from thetank, so that the ejector may be cut out of service at anytime. Sewage ejectment apparatus should always be installedin duplicate so that either apparatus may be cut out for Digitized by Microsoft® 108 Principles and Practice of Plumbing cleaning or repairs without interrupting the drainageservice. The manner of installing a duplicate compressedair apparatus is shown in Fig. 59. The size of sump tanks for sewage ejectment dependsupon the frequency with which they are to be emptied andthe probable amount of sewage to be taken- care Whenoperated automatically they need only be large enough tohold an hours storage of sewage, during the hour of maxi-mum flow. The process of
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