. The Locomotive. ptfree and open. Upon comingon duty and several timeswhile on duty the firemanshould blow down the watergauge piping to preclude anypossibility of a stoppage inthe pipe such as might becaused by scale entering itfrom the boiler. To do thisthe cocks or valves at the top( Xo. 2) and the bottom ( ) of the gauge glass areclosed and the mud valve1 Xo. 1 ) in the water columndrain is opened and permittedto blow >team and water fora minute or two so as to thor-oughly flush out the watercolumn and the pipe connec-tions to the boiler. After thishas been done and valves 2and 3 h
. The Locomotive. ptfree and open. Upon comingon duty and several timeswhile on duty the firemanshould blow down the watergauge piping to preclude anypossibility of a stoppage inthe pipe such as might becaused by scale entering itfrom the boiler. To do thisthe cocks or valves at the top( Xo. 2) and the bottom ( ) of the gauge glass areclosed and the mud valve1 Xo. 1 ) in the water columndrain is opened and permittedto blow >team and water fora minute or two so as to thor-oughly flush out the watercolumn and the pipe connec-tions to the boiler. After thishas been done and valves 2and 3 have again been opened,attention should be turned tothe gauge glass itself. Thepet cock ( Xo. 4) should firstbe opened and steam andwater allowed to blow throughit freely for a short the top valve, Xo. 2, isclosed to let water only passout through the pet cock,thereby showing a clear pas- D 1, 3To Steam Space J or Boiler r1 r r 1 lb Steiam , 1 ij Gouge-, -To Water Spaceof Boiler h. Valve No. I 10 f\GH Pit. 1932.] THE LOCO M ori V E. 5 sage to the bottom f the gauge. l-\ closing valve 3 and opening valve 2the passage of steam only will indicate thai the top connection is this manipulation of the valves has been accomplished, the petcock is closed and the top and bottom gauge cocks opened. If the con-nections are clear, the water will rise at once to the proper level whereit will have a gentle up and down motion in the gauge glass. On theother hand, if the bottom connection were obstructed in any way tin-water would not return quickly to its proper level. If, at the sametime, the top connection were open, steam would enter through it andby condensing in the glass would give a slowly rising water level. Afaulty reading would also be given if the top valve were left closed afterthe procedure of blowing down. The vapor left in the glass wouldslowly condense, thereby forming a vacuum and the water, enteringthrough the lower connection and forced by the pressure in
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Keywords: ., bookauthorhartfordsteamboilerin, bookcentury1800, bookdecade1860
