La locomotive . , À la poêle à gaz ayant été laissé sur toute la nuit. En fonction du type de valve World, la nouvelle école secondaire atPagosa Springs, Colorado est chauffée avec de l'eau chaude naturelle bien anartesian 350 pieds de profondeur. Le bâtiment contient environ 7 000 ft. ofradiation, qui, en raison de la basse température de l'eau de puits.double pratiquement le rayonnement qui serait requis pour artificialheat. 1926.] [ T I L L O C O M O T I V E 35 explosions de chaudière en double. La foudre n'est jamais dit de frapper deux fois au même endroit, il n'est pas andalthough Ces la croyance populaire protégeant les propriétaires

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The Locomotive . , to the gas heater having been left on over night. According to The Valve World, the new high school building atPagosa Springs, Colorado is heated with natural hot water from anartesian well 350 ft. deep. The building contains about 7, 000 ft. ofradiation, which, owing to the lower temperature of the well water.is practically double the radiation that would be required for artificialheat. 1926.] T I [ l L O C O M O T I V E 35 Duplicate Boiler Explosions. LIGHTNING is said never to strike twice in the same place, andalthough there is no such popular belief protecting the ownersof boilers, the natural effect of a boiler explosion is to impressitself so vividly on the minds of the persons connected with the plantthat the standard of safety is raised and the possibility of a repetitionbecomes more remote. A boiler explosion doesnt just happen, butinstead is brought on by a definite cause. If the cause is not definitelydetermined and removed, a repetition of the accident is to be expected.. llG. I. For instance, stop valves on steam lines are frequently ruptured bywater-hammer. The water-hammer is most likely produced by animproperly drained- pipe system or by faulty operation of the boilers.Unless the piping is redesigned or the boiler operation improved, furtheraccidents are almost sure to occur. The aite Phillips Company of Rainbow Bend near Winfield, Kansas, suffered a boiler explosion in July 2, 1925, and on September12, 1925 suffered a second explosion from exactly the same cause —low water. The installation consists of four locomotive type boilers, as shown in Fig. i, that operate at 150 lbs. pressure. At the time ofthe first accident, which occurred about 2:40 a. m., the fireman wasabout 100 ft. away from the boiler house, returning from anotherbuilding. The water level in boiler No. i became low and uncoveredthe crown sheet with the usual result. The crown sheet overheatedand collapsed and ruptured, causing the boiler to be thrown forward 36 T

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