. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. h furnace, which caube fired alternately. The great loss arising from a rush of cold air on opening thefurnace doors for replenishing the fires with fuel has led tocostly experiments to produce a mechanical stoker, or selfboiler feeding axrangement for supplying the coal as needed. Maxims and Instructions. /;/ FUSIBLE PLUGS. In some States the insertion of fusibleplugs at the highest fire line in boilers iscompelled by law under a heavy design is to give the most
. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. h furnace, which caube fired alternately. The great loss arising from a rush of cold air on opening thefurnace doors for replenishing the fires with fuel has led tocostly experiments to produce a mechanical stoker, or selfboiler feeding axrangement for supplying the coal as needed. Maxims and Instructions. /;/ FUSIBLE PLUGS. In some States the insertion of fusibleplugs at the highest fire line in boilers iscompelled by law under a heavy design is to give the most emphaticwarning of low water, and at the sametime relieve the boiler of dangerous pres-sure. Figs. 78 and 79 exhibit two of the formsmost commonly used, and on the succeed-Fig. 78. ing page, in cut 80, is shown the device in operation where the water has sunk toa dangerously low level. In the illustration the device isshown in connection with a locomotive boiler, in the commontubular boiler the plug is usually inserted in the rear head ofthe boiler, so that in case of its operation it will not endangerthe These devices are designed to be screwed into the boiler shellat the safety line. The Figs. 78 & 79 exhibit their part to be screwed into the boiler is called the shell and iscommonly made of brass ; the internal part is plug and is madeof a soft metal like banca tin or acompound consisting of lead, tinand bismuth. This compositionmelts easily at the proper pointto allow escape, where the waterhas sunk to a dangerously lowlevel. There is considerable diversityin the make up of the materialused for filling the plug, whichmust not have its melting puintat anything less than the temper-ature of the steam lest it shouldgo ofE at the wrong time.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteamen, bookyear1917
