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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 ...
A steam boiler evaporates liquid water to form steam, or gaseous water, and requires frequent replenishment of boiler feedwater for the continuous production of steam required by most boiler applications. Water is a capable solvent, and will dissolve small amounts of solids from piping and containers including the boiler.
The spray type deaerator is similar to the tray type deaerator. The water is sprayed into a steam atmosphere and most of the oxygen and non-condensables are released to the steam. The water then falls to the steam scrubber where the slight pressure loss causes the water to flash a little bit which also aids the removal of oxygen and non ...
Typical points in the steam circuit where conductivity should be monitored are . Drum steam, Drum water, High pressure heaters, Low pressure heaters, Condenser, Plant effluent, D.M. plant, Make-up water to D.M. plant. Three types of conductivity measurement are usually done: Specific conductivity, Cation conductivity and; De-gassed cation ...
The total carryover is the sum of the two. Vaporous carryover generally increases with increasing steam pressure. In low pressure boilers, mechanical carryover prevails, possibly with the exception of more volatile impurities, such as silica. Impurity carryover can cause corrosion and fouling of steam turbines, reheaters, and superheaters.
The water is heated and then routed into a reduced-pressure flash evaporation "stage" where some of the water flashes into steam. This steam is subsequently condensed into salt-free water. The residual salty liquid from that first stage is introduced into a second flash evaporation stage at a pressure lower than the first stage pressure.