Boiler water is treated in order to prevent
a) sludge, mud, pitting, corrosion
b) foaming, corrosion, carryover, sludge
c) sludge, corrosion, scale, carryover
d) scale, sludge, mud, pitting
e) foaming, carryover, pitting, corrosion
Answer: C
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Power Engineering Chapter 66
- Demineralizer anion exchanger takes acid containing water and exchanges it with?
- Demineralizer salts in the cation exchanger are converted into __ and __.
- Demineralizer cation exchanger removes calcium, magnesium and __ cations.
- Demineralizers cation exchanger takes water containing salts and exchanges it with?
- Sodium chloride is also known as?
- When the zeolite material has given up all its Na cations, regeneration is done by filling it with a ___ solution.
- The zeolite is charged with a large amount of ?
- Lime-Soda Softeners use ___ to add to the water causing the scale-forming dissolved solids:
- In a cartridge filter, when the pressure drop between the inlet and outlet reaches a specified maximum valve, the cartridge must be?
- In a tubular filter-aid filter, when the filter starts to clog and requires backwashing, inlet and outlet valves are __ and the drain valve is __.
- In a tubular filter-aid filter, cylindrical tubes are covered by socks made of __ filter cloth?
- In a pressure filter, any suspended matter in the water will be trapped by ___ material?
- Dissolved solids cannot be removed by?
- Bicarbonates and sulphates are undesirable because they will cause?
- If sulphates of calcium and magnesium are not removed, they will cause?
- If bicarbonates are not removed before the water enters the boiler, they will cause?
- Coagulants added to water
- Filters are used
- The capacity of a sodium zeolite softener will drop due to zeolite attrition at about
- Zeolite of a sodium zeolite softener may be discharged to the sewer during the
- The regenerant used to regenerate a cation demineralizer is
- The chemical equation which represents the modification of bicarbonates in hard water by the use of a zeolite softener is
- The result of adding Al2 (SO4)3 to the raw water is
- Feedwater for a high pressure boiler should be
- Permanent hardness is caused by?