2Nd Class Fireman, High Pressure Boilers, Chapter 6, Exam Q&a

Front 1

Boiler water is treated to prevent ____

Back 1

Scale, oxygen pitting, caustic embrittlement

Front 2

Hardness is a measure of scale-forming ____ dissolved in water

Back 2

Minerals

Front 3

Boiler water having high alkalinity could develop ____

Back 3

Caustic Embrittlement

Front 4

Deposits of calcium and magnesium carbonates on the boiler heating surface cause ____

Back 4

Scale

Front 5

Pitting and channeling of boiler metal in the water are caused by ____

Back 5

Oxygen and Carbon Dioxide

Front 6

Chemicals added to the boiler water change the scale-forming salts into a(n) ____

Back 6

Nonadhering Sludge

Front 7

____ is small water particles and impurities carried out of the boiler into the steam lines

Back 7

Carryover

Front 8

Surface tension on the water in a steam drum is increased by ____

Back 8

Impurities that float on the water surface

Front 9

A direct cause of overheating of the boiler tubes is ____

Back 9

Scale formation of the tubes

Front 10

Priming is dangerous and can lead to ____

Back 10

Water hammer

Front 11

Scale buildup on the water side of a steam boiler is caused by ____

Back 11

Improper boiler water

Front 12

The required frequency for blowing down a steam boiler is best determined by the ____

Back 12

Boiler water analysis

Front 13

A cold lime-soda Softener works at ____

Back 13

Ambient temperature

Front 14

____ is a filtration process in which the water is pressurized and applied against the surface of a semipermeable membrane

Back 14

Reverse osmosis

Front 15

External feedwater Treatment conditions the boiler water before it enters the boiler using a(n) ____ Softener

Back 15

Ion-exchange, hot lime-soda, cold lime-soda

Front 16

A cold lime-soda Softener removes hardness by mixing lime-soda with the raw water and passing it through a ____

Back 16

Catalyst bed

Front 17

An ion-exchange Softener uses a resin bed to exchange ____ with ions that cause hardness in order to soften raw water

Back 17

Sodium

Front 18

One reason to perform a bottom blowdown is to ____

Back 18

Remove sludge from the bottom of the boiler

Front 19

A(n) ____ is generally added to the boiler water to protect the condensate lines from carbonic acid

Back 19

Amine

Front 20

A disadvantage of a timer-controlled blowdown is that it does not ____

Back 20

Consider changes to the feedwater

Front 21

A bottom blowdown should be performed at least once every ____

Back 21

Day

Front 22

A(n) ____ is a feedwater heater that separates oxygen and other gases from the feedwater by preheating the feedwater.

Back 22

Deaerator

Front 23

____ is the rapid fluctuation of the water level that occurs when steam bubbles are trapped below a film of impurities on the surface of the boiler water

Back 23

Foaming

Front 24

___ is an accumulation of compounds such as calcium carbonate and magnesium carbonate on the water side of the heating surfaces of a boiler.

Back 24

Scale.

Front 25

Maintaining proper ___ of boiler water at all times can prevent caustic embrittlement.

Back 25

Alkalinity.

Front 26

Priming is a very dangerous condition because it can lead to ___.

Back 26

Water hammer.

Front 27

___ is the rapid fluctuation of water level that occurs when steam bubbles are trapped below a film of impurities on the surface of the boiler water.

Back 27

Foaming.

Front 28

A ___ is a chemical used in a chemical test to indicate the presence of a specific substance.

Back 28

Reagent.

Front 29

When performing a manual titration test, a color change in the sample indicates ___.

Back 29

Hardness.

Front 30

The more dissolved solids in the water, the higher the ___.

Back 30

Conductivity.

Front 31

The most efficient boiler water treatment program is based on accurate ___ testing by the boiler operator and regular analysis by a lab.

Back 31

Daily.

Front 32

___ is a process in which the chemicals added to raw water cause suspended solids to adhere to each other, making them larger and heavier and causing them to settle out of the solution.

Back 32

Coagulation.

Front 33

Zeolites soften the water by exchanging calcium and magnesium ions in the water for ___ ions from the zeolite.

Back 33

Sodium.

Front 34

A lime-soda softener is a water softener that uses lime and soda ash to remove ___ from water.

Back 34

Hardness.

Front 35

A cation is a(n) ___.

Back 35

Positively charged ion.

Front 36

A cation-exchange resin exchanges hydrogen ions for ___ ions.

Back 36

Metal.

Front 37

Demineralization of makeup water is necessary for boilers operating above ___ psi.

Back 37

1000.

Front 38

Feedwater is normally ___ in some way to help remove dissolved gases.

Back 38

Agitated.

Front 39

Deaerators normally run at about ___ psi with a saturation temperature of 227°F.

Back 39

5.

Front 40

A color comparison test is used to determine the residual ___ level in boiler water.

Back 40

Phosphate.

Front 41

A neutralizing or filming ___ is generally added to boiler water to protect the condensate lines from carbonic acid.

Back 41

Amine.

Front 42

A boiler should be blown down, following established procedures, at least once every ___, regardless of analysis results.

Back 42

24 hr.

Front 43

___ blowdown is the process of removing water from a boiler near the NOWL to control the quantity of impurities in the remaining water or to remove a film of impurities on the surface of the water.

Back 43

Surface.

Front 44

Continuous blowdown is used in preference to bottom blowdown because it ___.

Back 44

Maintain consistent chemical levels.

Front 45

According to the ASME Code, if the MAWP exceeds ___ psi, the blowdown lines and the fittings between the boiler and the valve must be composed of extra heavy bronze, brass, or malleable iron suitable for the temperature and pressures involved.

Back 45

125.

Front 46

A ___ is a small tank in which makeup water is added to boiler blowdown water after it flashes in order to reduce the discharge water temperature.

Back 46

Blowdown Separator.

Front 47

In a blowdown heat recovery system, the ___ removes excess water from a flash economizer.

Back 47

Overflow Trap.

Front 48

Why is water treatment required?

Back 48

To extend the life of the boiler by removing impurities.

Front 49

A malfunctioning deaerator will result in what? ______

Back 49

Overusing the sodium sulfite.

Front 50

When is the best time to blowdown a boiler? _____

Back 50

At night (around 2am-3am)

Front 51

What is the maximum size of the surface blowdown line?

Back 51

2.5 inches

Front 52

Can the discharge from blowdown tanks be sent into the sewers with a temperature greater than 150 degrees Fahrenheit and a psi greater than 5.

Back 52

No.

Front 53

What are water lines in association to blowdown?

Back 53

It cools the blowdown water.

Front 54

If the MAWP exceeds _____ psi, the blowdown lines and the fittings between the boiler and the valve must be composed of extra heavy bronze, brass, or malleable iron suitable for the temperature and pressure involved.

Back 54

125 psi.

Front 55

What is an “ion exchange?”

Back 55

An exchange of ions between two electrolytes or between an electrolyte solution. In most cases the term is used to denote the processes of purification, separation, and decontamination of aqueous and other ion-containing solutions with solid polymeric or mineralic “ion exchangers.”