Document 91p7zQgGMVOxJVzw9GRrv0Kr5

"`""II spring . POWERFAX aerating trays is of paramount importance, as is also the method of insuring uniform delivery of water to the tray structure. The water piping, tray structure, and baffling system must be carefully designed to insure proper coor dination of the functions of each at all loads within the maximum rating. Storage capacity equivalent to two minutes of rated flow is gen erally provided in the deaerator, although occasionally plant con ditions require a storage capacity in the deaerator many- times this standard capacity. Excess storage capacity can be provided in a sep arate storage tank from which the feed pump takes its suction, with the deaerator mounted directly above. Experience indicates, how ever, that storage capacity is large ly a matter of personal preference, with the exception of the rare cases where rapidly and widely fluctuating load conditions are en countered. If metering equipment is de sired as an integral part of a de aerator, it can.be.'provided with any of the various types of de aerators available. The V-notch weir type of meter is generally provided as an integral part of metering deaerators and such de aerators can be provided with surge capacity between the de aerating compartment and the metering compartment as well as with storage capacity on the out board ride of the meter. A wide variety of special acces sory attachments, such'as record ing instruments, special overflow equipment, andoutsidefloat cham bers for the operation of water regulating valves, are frequently furnished with deaerator appa ratus of all types. The selection of such apparatus for use with the deaerator depends entirely upon the intention of operators towards keeping permanent records of per formance, as well as for insuring, as far as possible, the elimination of operating difficulties. General ly, the only difficulties encoun tered in the operation of a proper ly selected deaerator are in con nection with the accessories where in all moving parts are incorpo rated. I his photograph, which Twas published in the Decem ber 1933 issue of POWER, shows an Elliott deaerating heater being taken into the new Goodyear million-dollar power plant. POWER called the heater a "giant", but it is not as big as several deaerating heaters built by Elliott. The unit pictured has a capacity of 700,000 lbs. per hour, with 1000 cu. ft. of storage. It weighs 35 tons, is 25 ft. long, 13H ft. high. The unit is built of copper-bearing steel plate, welded throughout. The flat car on which it was brought to Akron had to be routed by a roundabout waybecause not all railroadbridges could provide the necessary clear ance for car and load to pass. But the heater seems to be going through the hole in the wall of the building which was left for that purpose. 15 CRIMDEBN00000209