E/MJ : engineering and mining journal . le trouble in winter, owing to the waterin exposed pipes and in the cooling tank freezing aftera temporary shutdown. It is well known that still waterin an open tank or vessel always freezes on the top satisfactory method of overcoming these difficultiesis shown in the accompanying sketch. The pipe con-nections to the tank are made in the usual way, except-ing that the top connection is at least 1 ft. below thetop of the tank, and no valve is placed on the overhead September 6, 1919 Engineering and Mining Journal 407 line outside the tank. Instea
E/MJ : engineering and mining journal . le trouble in winter, owing to the waterin exposed pipes and in the cooling tank freezing aftera temporary shutdown. It is well known that still waterin an open tank or vessel always freezes on the top satisfactory method of overcoming these difficultiesis shown in the accompanying sketch. The pipe con-nections to the tank are made in the usual way, except-ing that the top connection is at least 1 ft. below thetop of the tank, and no valve is placed on the overhead September 6, 1919 Engineering and Mining Journal 407 line outside the tank. Instead, the line is run into thecenter of the tank and turned down, the valve B beingat least 1 ft. below the elbow. A lever is then connectedto this valve in the manner shown. The tank shouldalways be kept full of water, and whenever the machineis shut down in cold weather valves B and C are closedat once and the engine is drained at D. A temporary shutdown in the coldest weather will notinterfere with the resumption of operations; in fact. METHOD OP PREVENTING THE OFCIRCULATING-WATER PIPE the tank would have to freeze almost solid before thesystem would be affected. The lever operating the valvewill be frozen in, of course, but a little hot water, ordrilling, will release it. Valve C and the nipple in thetank are generally protected by packing, but, if neces-sary, they could also be extended into the tank and op-erated like B. Such tanks are usually placed outside the engine room,and another good practice is to board them in, leavingabout a foot of space between the tanks and walls, fillingthis space with manure or other handy non-conductingmaterial to a foot or so of the tops of the tanks andthen covering the shed with doors. This will not onlykeep out the cold winds but prevent undue vaporizationin summer. Handling Flue DustAt the Nichols Copper refinery on Long Island,N. Y., flue dust is mixed with cement in a concretemixer. Just sufficient water is added to ma
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
