E/MJ : engineering and mining journal . ere is not so much likeli-hood of the dampers being entirely closed and the airsupply shut off. for in this lies one of the greatestdangers. Should the breeching damper be closed whilethe fire is still on, the chances are that an explosion willoccur, as the oil in the hot furnace will generate a largevolume of volatile gas, which only awaits the admissionof air to he ignited with disastrous results. To preventthe possibility of an occurrence of this sort, a safetystop should be placed so as to prevent the complete closingof the damper without removing th
E/MJ : engineering and mining journal . ere is not so much likeli-hood of the dampers being entirely closed and the airsupply shut off. for in this lies one of the greatestdangers. Should the breeching damper be closed whilethe fire is still on, the chances are that an explosion willoccur, as the oil in the hot furnace will generate a largevolume of volatile gas, which only awaits the admissionof air to he ignited with disastrous results. To preventthe possibility of an occurrence of this sort, a safetystop should be placed so as to prevent the complete closingof the damper without removing the stop. T© Css,tc&& IL©s© F^istm-p VaEves A strainer such as that shown in the accompanyingillustration may be profitably used in the discharge lineof a boiler-feed or other pump, says C. W. Watkin, inPower,.Oct. 31, 191fi. If any of the pump valves workloose, they are apt to get lodged in the pipe line or someof the valves. The best location for a strainer is nextto the pump, but the one shown can be placed between. STRAINER IN FLANGE JOINT NEXT TO PUMP flanges anywhere. It is made out of a sheet of brass orbronze cut to the diameter of the inside of the boltcircle and the web openings or perforations made ofsufficient size not to obstruct the flow of water bydecreasing the area of the pipe. C^oa2*se-=^s*^aslmsEag s>s In the installation of coarse-crushing systems in themost modern of wet-treatment mills, a tendency may benoted to avoid the practice of returning oversize materialto a crushing machine of any kind. One of the newestlarge mills deposits the coarse ore from the mine into abin from which it is fed into large gyratory the material is delivered to another bin, and fromthere passes over a grizzly, where the undersize goes to themill bin and the oversize passes through a group of diskcrushers, there being no return, only one pass throughthe machine being made. Any further crushing requiredis given in separate machines, no provision being madefor r
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
