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40 Cards in this Set
- Front
- Back
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Pure water |
Water that is odorless, colorless and tasteless. It is very active solvent. |
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Lake Michigan Water |
_____ water that has a total concentration of approximately 150ppm. |
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Scale |
_____ is caused by impurities in water being deposited on heating surfaces. |
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Corrosion |
____ is the eating away of metal caused by the reaction between the metals and oxygen. |
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Boiler water carryover |
______ is the contamination of the steam with boiler water solids. |
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Foaming and Priming |
Two of the most common types of carryover |
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Foaming |
Bubbles or froth actually build up on the surface of the boiler water in the steam drum and pass out with the steam. |
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Priming |
A sudden surge of boiler water that carries over with the steam. |
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Foaming |
_____ is generally caused by high concentrations of solid in boiler water. |
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Priming |
It may be caused by improper construction of boiler, excessive boiler ratings or sudden fluctuations in steam demand. |
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Silica Carryover |
A special type of carryover appears with boilers operating at high temperatures and pressures. |
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Clarification |
Removal of Suspended Impurities |
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Sedimentation |
It is accomplished in a large basin where the water is held until the dirt settles to the bottom. |
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Filtration |
Allowing the water to run through a bed of fine sand. |
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Coagulant |
Chemical that is used to speed up the clarification of water by sedimentation or filtration. |
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Sodium Zeolite |
It softens hard water by exchanging the calcium and magnesium salts responsible for the hardness of water for very soluble sodium salts. |
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Evaporation and Demineralization |
Two methods of removal of all impurities |
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Evaporation |
It consists of boiling water and the removal of this pure distillate from the evaporator and using it for boiler feed purposes. |
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Deionization |
Another term for Demineralization |
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Demineralization/Deionization |
Method that only removes mineral from the water. |
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Ions |
It is electrically charged parts of some chemical compounds. |
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Cation |
Positively charged ion |
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Anion |
Negatively charged ion |
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Demineralization |
It is the use of a resin, to interchange these electrically charged parts, to form different chemical compounds. |
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Catexer Tank |
Tank that is filled with resin which removes Cation. |
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Anexer tank |
Tank that is filled with resin which removes anion. |
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Catexer Tank |
Tank that is regenerated by using dilute sulfuric acid |
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Anexer Tank |
Tank that is regenerated by washing with Caustic or dilute sodium hydroxide. |
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Degasifier or decarbonator |
Another term for Aerator |
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Rinsing |
After regeneration, it is necessary to rinse to waste surplus regeneration chemical which was not used up in the regeneration process. |
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pH |
It is a measurement of water to indicate if the solution in the acid of alkaline side has a numerical value from 1 to 14. |
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Phosphate |
The most common agent used to prevent scale formation within the boiler is some form of ____. |
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Phosphate |
It causes the precipitation of the scale - forming substances within the boiler. |
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Santosite and hydrazine |
Common agents used in oxygen scavenging. |
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Hydrazine |
It is the most widely used agent because of its simpler application. |
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Morpholine |
When ammonia is not used, _____ is used to neutralize the acidity of the condensate. |
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Rusting |
Tanks made of steel are subject to ____. |
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Silica content |
Tanks made of concrete increase the ____ of the water. |
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Aluminum |
Tanks made of ______ are being used provided the acidity and alkalinity is not great. |
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Galvanized Steel |
_____ tanks are adequate for drinking water storage. |
