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This was the cause of the Gettysburg Railroad firebox explosion [22] near Gardners, Pennsylvania, in 1995, where low water allowed the front of the crown sheet to overheat until the regular crown stays pulled through the sheet, releasing a great deal of steam and water under full boiler pressure into the firebox. The crown sheet design included ...
Hard water intended for low-pressure boilers may be softened by substituting sodium [18] for divalent cations of dissolved calcium and magnesium most likely to cause carbonate and sulfate scale. [19] High-pressure boilers typically require water demineralized by reverse osmosis, distillation or ion-exchange. [20]
These water treatments often include compounds forming a sludge to entrap such particles; and boilers intended for such water treatment include a structure called a mud drum at the lowest part of the boiler. Bottom blowdown involves periodically opening valves in the mud drum to allow boiler pressure to force accumulated sludge out of the boiler.
The concentrated area with high stress works as anode and diluted area works as cathode. At anode, sodium hydroxide attacks the surrounding material and then dissolves the iron of the boiler as sodium ferrate forming rust. This causes embrittlement of boiler parts like rivets, bends and joints, which are under stress.
The city's water department was working to repair the issue by 1:30 p.m. Wednesday.
Boiler water is treated to prevent scaling, corrosion, foaming, and priming. Chemicals are put into boiler water through the chemical feed tank to keep the water within chemical range. These chemicals are mostly oxygen scavengers and phosphates. The boiler water also has frequent blowdowns in order to keep the chloride content down.
According to the NTSB's preliminary report, customers in the accident area received gas from a low-pressure (0.5 psi) distribution network which, in turn, was fed from a high-pressure (75 psi) main pipeline via regulators controlled by sensors measuring pressure in the low-pressure pipes. At the time of the accident, workers were replacing some ...
The National Boiler Insurance Company Laxton, William (1866). "Abstract of Report". The Civil Engineer & Architect's Journal. 29 (February 1st): 39– 40; Redfield, William C. (1839). Letter To The Secretary Of The Treasury, On The History and Causes of Steamboat Explosions And The Means Of Prevention. New York: william Osborn.
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