READERS’ QUESTION BOX
Firemen in Theatres
TO THE EDITOR—Does the slate law require the presence of firemen in theatres during a performance?
CHEMICAL ENGINE CO., NO. 1.
Olean. N. Y., January 24, 1914.
There is no state law relative to firemen being stationed in theatres during a performance.
The Chimney Spark Problem
To THE Editor:—What is the best method for preventing fires caused by sparks from chimneys or flues? I have had several fires at one residence each of which was caused in this way. Thanking you in advance, I am,
E. N. K.
Columbia, Mo., January 24, 1914.
A means quite often employed is the placing of a cap over the chimney, allowing the corners to rest on legs.—Editor.
Technicalities of Fire Fighting
To THE Editor:—Will you kindly answer the following questions:
In a building 148 ft. or twelve stories high, located on the opposite side from a fire, the street being 80 ft. wide, the building is equipped with size standpipe required by law, and engine is located at a hydrant 450 ft. distant from the standpipe, and another engine at hydrant 300 ft. from the standpipe with 3-in. hose. You are in command of one of the engine companies and in company operation with the officer in command of the other company are directed to proceed to the roof, Siamese the two companies in the best possible manner in order to deliver an effective single stream across the intervening space. Explain in detail what fittings, tools, hose and nozzle you would use to properly carry out this order, and assuming that you required a nozzle pressure of 100 lbs., what pressure would you order on the pumps of the engines?
C. A. T.
New York, January 20, 1914.
The above question calls for these two answers. Pressure to be ordered on pumps, practically all they can give, technically or theoretically, 260 to 275 lbs. Tools required, perfection pipe holder, 1 1/2-in. open nozzle, roof rope, ax, Siamese 2-2 1/2-in. into 1-3 ½-in. with 3 ½-in. to 3-in. reducer, one length 3-in. hose and two lengths 2 1/2-in. hose. Reason for carrying and manner of using above tools—ax to break locks or doors to get to roof—connect one length 2 1/2-in. hose to top floor standpipe connection and stretch to roof. Connect second length to roof outlet and both to siatnese; put reducer on Siamese. Connect 3-in. length, put on nozzle, fasten to perfection holder and tic roof rope so line can’t get away.
Now as to pressure: 1 1/2-in. nozzle with 100 lbs. pressure delivers about 670 gallons. Rule— The square of the diameter of nozzle mutiplied by the square root of the pressure and that product by 29.7, equals gallons discharged per minute; that discharge loses by friction in the 50-ft. length of 3-in. about 12 lbs. The loss in the 50-ft. lengths of 2 ½ is 25 lbs., due to friction and increase in altitude of length from floor below; the loss in standpipe (which in New York is 4-in.) is 25 lbs., added to 65 for altitude, makes 90, and the loss for engines to standpipe is about 36; thus we have 100 plus 12, plus 25, plus 90, plus 36, equals 264. Since all engines are geared to work at not more than 300 lbs., and if they did increase to this amount no more than 5 or 6 lbs. would be added to nozzle pressure, it would be well to order all the water they could give.