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When the fourth floor was added, the original boiler was replaced by a larger one and the old boiler, 17 feet (5.2 m) long and six feet (1.8 m) in diameter, was left in place as a backup. Since the new boiler could generally meet the factory's demands on its own, the old one was seldom used; and when used, was used reluctantly.
Because the factory was brand new, only one furnace was active that day. The remaining furnaces were not scheduled to start until the following Monday. The furnace was 30 by 60 feet (9.1 by 18.3 m) and was filled with 15 short tons (14 t) of molten glass with a temperature of 3,000 °F (1,650 °C).
Boiler explosions are of a particular danger in (locomotive-type) fire tube boilers because the top of the firebox (crown sheet) must be covered with some amount of water at all times; or the heat of the fire can weaken the crown sheet or crown stays to the point of failure, even at normal working pressure.
If those power lines were a substantial cause of the fire, that could be enough to recover billions of dollars in damages from the utility, even if it complied with regulations, legal experts said.
A typical Cochran boiler, as illustrated, [5] might be 15 feet (4.57 m) high and 7 feet (2.13 m) in diameter, giving a heating surface of 500 square feet (46.45 m 2), and a grate area of 24 square feet (2.23 m 2). Working pressure is between 100 and 125 psi (6.9 and 8.6 bar; 690 and 860 kPa).
This is achieved by maintaining a supply of fuel to the fire, monitoring the smoke from the fire and controlling it by the use of primary air through the fire bed/grate and secondary air through the firebox door and maintaining the boiler water level by use of steam injectors so that it covers the firebox crown sheet at all times – otherwise ...
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