. American engineer and railroad journal . uses from 80,000 to gallons of water per day,the cost of pumping being between five and six cents per thou-sand gallons. The use of a gravity flow for this horizontal dis-tance would have cheapened the cost, but as it stands, it is notexcessive for a lift of 73 feet. The air pressure in the shop pip-ing is 125 pounds per square inch, which is throttled downthrough a one-inch globe valve to a pressure of 60 pounds forthe pumping. A small fraction of a turn of this globe valve Well Piping. supplies enough air from the pressure of 125 pounds to k
. American engineer and railroad journal . uses from 80,000 to gallons of water per day,the cost of pumping being between five and six cents per thou-sand gallons. The use of a gravity flow for this horizontal dis-tance would have cheapened the cost, but as it stands, it is notexcessive for a lift of 73 feet. The air pressure in the shop pip-ing is 125 pounds per square inch, which is throttled downthrough a one-inch globe valve to a pressure of 60 pounds forthe pumping. A small fraction of a turn of this globe valve Well Piping. supplies enough air from the pressure of 125 pounds to keep a constant stream of water flowing into the tank. In the drawing it will be noticed that the top of the eight-inch well casing has a tight flange connection with the four-inch pipe; this was not necessary for the perfect working of thedevice, but it was done to prevent water or dirt from the openwell from passing down into the casing, as the water is usedfor drinking purposes. As the four-inch pipe and the one-inch air pipes are sus-. Piping to the Tanks. pended in the well casing from the top end, double thick gal-vanized iron pipe was used for this portion to insure againstrusting and breaking off and dropping down into the well. Theresistance due to 100 feet of water is sufficient to prevent un-due vibration of the pipes, which might be caused by the escap-ing of the compressed air. The number and size of motors to use in equipping a shopwith electrical machinery is always an interesting account of the plan worked out for the new Porifirio Diazshops of the Mexican International Railway, described in theRailway and Engineering Review, states that in this casethe shafting and machinery of the shops are divided into 10-horse-power units, each unit being driven by a separate motor,while larger or smaller motore will drive individual machineswherever circumstances require. There is an advantage in us-ing a number of motors of uniform size on account of replace-ment
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
