. Railway mechanical engineer . d excessively wide, the insidediameter of the column may be made 3J^ in. and that ofthe top connection 2 in. Experiments with column andsteam pipe of these dimensions and the -J^-in. opening inthe connection to the boiler at the bottom showed that thewater in the column glass could not be raised, by openingthe gage cock, to exceed J4 n., regardless of the amountor the length of time the gage cocks were open. It is recommended that the bottom water glass cock andbottom connection to the water column enter the boiler hori-zontally, and that the water column and wa
. Railway mechanical engineer . d excessively wide, the insidediameter of the column may be made 3J^ in. and that ofthe top connection 2 in. Experiments with column andsteam pipe of these dimensions and the -J^-in. opening inthe connection to the boiler at the bottom showed that thewater in the column glass could not be raised, by openingthe gage cock, to exceed J4 n., regardless of the amountor the length of time the gage cocks were open. It is recommended that the bottom water glass cock andbottom connection to the water column enter the boiler hori-zontally, and that the water column and water glassesshould stand vertical. Steam-pipe connections to water columns and waterglasses should be made as short as possible, so as to obtaina supply of dry steam at all times, and so arranged as tothoroughly drain and be free from short bends or any pos-sibility of sags or traps. It has been definitely establishedthat where traps or sags that will retain the water of con-densation are permitted in the top connection to water. Fig. 7—Recommended Arrangement of V^ater Indicating Devices height of water over the crown sheet and to broaden theview from different parts of the cab. In constructing and applying the water column, the ratioof openings between top and bottom connections, as indi-cated by Fig. 7, should be retained, and the bottom con-nection screwed into the boiler far enough to pass all ob-structions which may be immediately above them. It wasillustrated in the fifth series of tests that when the bottomconnection to the column entered the boiler head one inchpast flush, and directly under a T iron, it caused the waterto rise one inch in the column glass, but when extended pastthe T iron, the readings in all glasses corresponded. The larger connection to the top of the column, and re-stricted openings in the gage cocks, which should be notmore than ^ in. in diameter, are suggested for the pur-pose of preventing the water from being raised when thegage cock is opened
Size: 2150px × 1162px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
