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1st Year Low Pressure Boiler > Chapter 7- Boiler Water Treatment > Flashcards

Chapter 7- Boiler Water Treatment Flashcards

1
Q

What is Feedwater?

A

Water that is treated for use in the boiler

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2
Q

What is boiler water?

A

Water in the boiler that is used to produce steam

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3
Q

What is Dissolved Solids?

A

Are impurities such as calcium, silica, and iron that have dissolved into solutions

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4
Q

What is boil out?

A

The process of boiling a solution of water and cleaning g chemicals in a newly installed or repaired boiler

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5
Q

What is scale?

A

The accumulation of minerals such as calcium and magnesium on the water side of boiler heating surfaces

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6
Q

What is Silica?

A

A substance found in sand and some water that can form scale

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7
Q

What is hard water?

A

Water that contains large quantities of dissolved minerals

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8
Q

What is soft water?

A

Water that contains small quantities of dissolved minerals

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9
Q

What is a Nonadhering Sludge?

A

A collection of muddy mineral sediment that can be discharged while suspended in boiler water

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10
Q

What is Corrosion?

A

The rusting or putting of boiler metal

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11
Q

What is an oxygen scavenger chemical?

A

A chemical that combines with oxygen to form harmless compounds for removal from the boiler

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12
Q

What is Sodium sulfite?

A

Is an oxygen scavenger that is commonly used to treat boiler water

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13
Q

What is caustic embrittlement?

A

A condition where exposure to highly alkaline elements causes boiler metal corrosion at stress zones in the boiler

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14
Q

What is priming?

A

A condition that occurs when large slugs of boiler water are carried into the steam line

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15
Q

What is carryover?

A

A condition that occurs when small particles of boiler water are carried into steam lines

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16
Q

What is a High surface tension?

A

A boiler water condition in which the surface of the water is strengthened by a layer of impurities

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17
Q

What is Foaming?

A

A boiler water condition caused by the formation of steam bubbles trapped below a film on the boiler water surface

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18
Q

What does foaming prevent?

A

Foaming prevents proper heat transfer of heating surface, causing dangerous overheating

19
Q

What is a blister?

A

A condition of the boiler shell in which a bludge occurs from a separation of the boiler shell metal

20
Q

What is a Bag?

A

Is a bulge or deformed area of the boiler shell that extends through the entire thickness caused by localized overheating

21
Q

What is boiler water analysis?

A

Boiler water analysis tests the condition of boiler water and is used to determine the feedwater treatment required

22
Q

What is Alkalinity?

A

The ability of a compound dissolved in water to neutralize acids and is indicated by its pH level

23
Q

What is pH?

A

A measure of the acid-alkaline balance of a solution and is indicated on a scale from 0-14

24
Q

A solution with a pH less than 7 is acidic

A solution with a pH of 7 is neutral

A solution with a pH higher than 7 is alkaline

A

.

25
Q

What is Hardness?

A

The amount of dissolved calcium and magnesium in water

26
Q

What is a reagent?

A

A chemical used in a water treatment test to indicate the presence of a specific substance

27
Q

What is a titration test?

A

A water treatment test using a reagent to determine the concentration of a specific dissolved substance

28
Q

What is a conductivity meter?

A

An instrument used to determine total dissolved solids present in boiler water

29
Q

What is conductivity?

A

The ability of a material to pass electrons (electricity)

30
Q

What is an External boiler water treatment?

A

Is treating the water (feedwater) before it enters the boiler

31
Q

What can be removed by heating the feedwater?

A

Oxygen and non condensable gases

32
Q

What is a pre-treatment equipment?

A

Is equipment used before boiler water treatment chemicals are added to feedwater directed to the boiler

33
Q

What is a Water softener?

A

Is boiler water pre-treatment equipment that is used to remove calcium and magnesium to reduce hardness

34
Q

What is a zeolite water softener?

A

Softens water by replacing calcium and magnesium with sodium

35
Q

What is a Zeolite?

A

Is the mineral group that includes silicates of aluminum, sodium, and calcium used to soften water

36
Q

What is a Deaerator?

A

Is a boiler water treatment accessory that heats the feedwater to the Temperature of saturated steam at the pressure within a pressure vessel

37
Q

What is Saturated Steam?

A

Is pure steam at a temperature that corresponds to the boiling point of water at the steam pressure

38
Q

What is a Package feedwater system?

A

A tank, pumps, and controls used to heat feedwater

39
Q

What is a surge tank?

A

A large condensate receiver that is used to collect condensate before it is directed to the boiler or deaerator

40
Q

What is a bypass feeder?

A

A water treatment accessory that introduces water treatment chemicals in a loop

41
Q

What is a chemical feed system?

A

A water treatment system that introduces feedwater treatment chemicals into a boiler at a predetermined and controlled rate

42
Q

What is a internal boiler water treatment?

A

Is treating boiler water after it has entered the boiler

43
Q

How many times my the boiler water be tested?

A

Daily

44
Q

What is a blowdown?

A

Is the process of evacuating (discharging) water and undesirable accumulated material

1st Year Low Pressure Boiler (11 decks)

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