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Boiler water/ feedwater Flashcards

1
Q

what does the term distillate refer to?

A

eveaporated water that is discharged from the ships distilling plant

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2
Q

where is distillate stored?

A

in the reserve feed tanks

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3
Q

in shipss equpied with demineralizers, the water entering from any tank is called reserve feedwater, while the water flowing out of the demineralizer to the condensate system is called?

A

makeup feedwater

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4
Q

after steam has done its work, it is returned to the liquid state by cooling in a condenser, what is this liquid termed?

A

condensate

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5
Q

what are the principle sources of condensate?

A

main and auxiliary condensers

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6
Q

a properly deaerating feed tank (DFT) will maintain the dissolved oxygen content at or below what level?

A

15 parts per billion

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7
Q

boiler water is defined as?

A

the feedwater as it enters the boiler steam drum

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8
Q

if a boiler is producing steam at about 50 percent of its capacity, the dissolved and suspended materials brought into the boiler with the feedwater will concentrate in the boiler at what rate per hour?

A

10 fold per hour

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9
Q

what effect will an excess of hydrogen ions have on boiler water?

A

increase in acidity

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10
Q

a PH of seven is defined as

A

Neutral

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11
Q

what effect will an excessive amount of hydroxyl ions have on boiler water?

A

alkalinity will increase

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12
Q

a hydroxyl ion is represented by what?

A

OH-

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13
Q

a hydrogen ion is represented by what?

A

H+

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14
Q

what is the initial reaction that takes place between pure oxygen-free water and the iron in the boiler water after light off?

A

formation of a magnetite layer

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15
Q

what function does the magnetite layer serve?

A

to passivate the tube metal and reduce corrosion to minimum

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16
Q

what are the two major hardness consituents and the primary sources of scale in boilers and feed system heat exchange equipment?

A

calcium and magnesium

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17
Q

what type of deposits act as insulators and reduce the heat transfer across any surface?

A

scale

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18
Q

because of very high furnace temperatures, modern naval boilers can tolerate no more than a few thousandths of an inch of scale on tube surfaces without suffering what?

A

tube ruptures

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19
Q

what determines the amount of oxygen that will dissolve in water?

A

surface pressure and temperature

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20
Q

when dissolved oxygen enters the boiler water, it causes what type of corrosion?

A

localized (pitting) corrosion

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21
Q

as the alkalinity of the boiler water decreases, the severity of dissolved oxygen attack does what?

A

increases

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22
Q

boiler watersides which are open to the atmosphere are subject to what type of corrosion?

A

dissolved oxygen

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23
Q

chloride is an indication of what type of contamination?

A

seawater

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24
Q

chloride is an aggressive ion which which causes dissolution of what protective layer?

A

magnetite

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25
Q

the ability of liquid to conduct an electric current is called what?

A

conductivity

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26
Q

conductivity is expressed in?

A

micromhos per centimeter (umhos/cm)

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27
Q

electrolytic corrosion depends upon the presence of what?

A

anodes and cathodes

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28
Q

what will an excessive high conductivity cause?

A

carryover

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29
Q

how are dissolved and suspended solids controlled in a steaming boiler?

A

by blowdowns

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30
Q

which carryover is caused by excessive amounts of of dissolved and suspended solids?

A

foaming

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31
Q

what is the primary source of silica contamination?

A

poor quality shore source feedwater

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32
Q

what is the maximum silica content of shore source feedwater?

A

.20 parts per million (PPM)

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33
Q

Desiccant is mostly comprised of what material?

A

silica gel or silicate

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34
Q

what type of deposits are formed in the boiler, when the boiler water is contaminated with oil?

A

carbonaceous deposits

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35
Q

what effect does seawater have on boiler water?

A

decreases alkalinity which could lead to an acid corrosion

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36
Q

shore water causes alkalinity to?

A

increase

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37
Q

what type of corrosion is caused by shore water contamination

A

caustic corrosion

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38
Q

what will a malfunctioning or improperly operating DFT cause?

A

dissolved oxygen corrosion

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39
Q

why is the hydrazine added to the condensate/ feedwater system?

A

to reduce corrosion in the pre-boiler system

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40
Q

where is hydrazine introduced into the system?

A

deaerating feed tank

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41
Q

what are the three treatment chemicals used to batch treat the boilers under?

A

trisodium phosphate (TSP), disodium phosphate (DSP), and Caustic soda

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42
Q

what effect does trisodium phosphate (TSP) have on boiler water?

A

increases alkalinity, phosphate and conductivity

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43
Q

what effect does disodium phosphate (DSP) have on boiler water?

A

increases phosphate and conductivitu

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44
Q

what effect does caustic soda have on boiler water?

A

increases alkalinity and conductivity

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45
Q

sludge in boiler water is an agglomeration of what?

A

reaction products of boiler water treatment chemicals with calcium and magnesium contaminants

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46
Q

how is sludge removed from the boiler?

A

by bottom blowdown

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47
Q

what type of blowdown serves the purpose of reducing the amounts of materials dissolved in the boiler water?

A

surface blowdown

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48
Q

virtually all chemical hideout in naval boilers occurs following what four events?

A

acid cleaning, EDTA cleaning, a contamination incident

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49
Q

hard deposits can only be removed by what type of cleaning?

A

acid cleaning

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50
Q

who is the only authority that can authorize acid cleaning?

A

NAVSEA

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51
Q

what is the purpose of conducting daily salinity indicator comparison?

A

to ensure that the salinity indicator is properly functioning

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52
Q

what does the acronym SI mean?

A

Salinity indicator

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53
Q

what is the maximum allowable tolerance for the daily salinity indicator comparison test?

A

plus or minus .02 equivalent per million (EPM)

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54
Q

the maximum final distillate salinity indicator reading is?

A

.065 equivalent per million (EPM)

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55
Q

what is the maximum chloride limit for reserve feedwater?

A

.10 equivalent per million (EPM)

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56
Q

what is the maximum salinity indicator reading on an auxiliary condenser?

A

.02 equivalent per million (EPM)

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57
Q

what is the boiler water phosphate test measured in?

A

Parts per million (PPM)

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58
Q

what is the maximum conductivity reading on the inlet of the demineralizer?

A

15 microhms per centimeter (umhos/cm)

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59
Q

what is the maximum chloride limit for final distillate?

A

.07 equivalent per million (EPM)

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60
Q

ships equipped with chelant continuous injection systems shall maintain the feedwater hydrazine level at what range?

A

10-40 PPB

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61
Q

when a salinity indicator is malfunctioning, what action must be taken?

A

sample and test the effected salinity indicator every 4 hours until the cell is restored

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62
Q

what is the maximum hardness limit for reserve feedwater?

A

.10 equivalent per million (EPM)

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63
Q

the deaerating feed tank (DFT) is sampled and chemically tested for dissolved oxygen at what interval?

A

prior to feeding the boiler, 2 to 3 hours after the boiler is on-line, and daily thereafter while on-line

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64
Q

the dissolved oxygen content of the deaerated feedwater shall not exceed what limit?

A

15 parts per billion (PPB)

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65
Q

what is the required PH limit for shore steam?

A

8.0-9.5 PH units

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66
Q

what is the maximum allowable conductivity of shore steam?

A

25 microhms per centimeter (umhos/cm)

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67
Q

what is the required PH of shore source processed feedwater?

A

5.4 to 8.2 PH units

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68
Q

what is the maximum silica content of shore steam?

A

.20 parts per million (PPM)

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69
Q

when are idle reserve feed tanks sampled?

A

daily, when not in use for more than 24 hours

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70
Q

what is the maximum allowable salinity indiactor reading for evaporator air ejector drains?

A

.065 EPM

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71
Q

what is the alkalinity range for a boiler with the Chelant system installed?

A

.100 to 1.000 EPM

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72
Q

what is the phosphate range for a boiler with the chelant system installed?

A

10 to 40 parts per million (PPM)

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73
Q

what is the maximum allowable conductivity reading on a boiler with Chelant?

A

500 microhms per centimeter (umhos/cm)

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74
Q

what is the maximum allowable difference between measure conductivity and the continous conductivity reading?

A

10 percent

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75
Q

how often is the continuous conductivity reading taken?

A

hourly

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76
Q

who takes the continuous reading hourly?

A

fireroom personnel

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77
Q

what is the maximum chloride limit on all naval boilers?

A

1.00 equivalent per million (EPM)

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78
Q

a freshly filled and treated boiler should be steamed within what time?

79
Q

routine boiler water samples are taken at what frequency?

A

at least every 24 hours

80
Q

a boiler water sample shall be taken at what periodicity prior to boiler blowdown?

A

within 1 hour

81
Q

when shall boiler water samples be taken after surface or bottom blowdown?

A

30 to 45 minutes after blowdown

82
Q

prior to securing, the boiler must be sampled within?

A

90 minutes

83
Q

why is a prior to light off sample not necessary on aboiler that ahs been freshly filled and treated?

A

the sample would not be representative of the boiler water, due to inadequate circulation

84
Q

how long is the chemical injection system aligned to the boiler while injecting treatment chemicals?

A

10 minutes

85
Q

during a serious contamination incident boiler water samples are drawn at what interval?

A

every 15-30 minutes

86
Q

when must the boiler be sampled after chemical addition?

A

60 to 90 minutes after addition

87
Q

a normal surface blowdown will result in what percentage of blowdown

88
Q

when are bottom blowdowns performed?

A

every 360 steaming hours and whenever the boiler is scured for longer than two hours

89
Q

is it allowable to bottom blow a steaming boiler?

A

no, due to the possibility of breaking circulation

90
Q

what is the minimum pressure, at which a bottom blowdown, shall be performed?

A

not less than 100 PSI

91
Q

what is the required to be done to all blowdown valves after completion of a 15 minute cooldown period?

A

.100 EPM alkalinity

92
Q

what is the minimum phosphate level required for boiler light off?

A

10 parts per million (PPM)

93
Q

what is the dump guideline for alkalinity on a chelant boiler?

A

alkalinity greater than 2.000 EPM

94
Q

what is the dump guideline for phosphate on a chelant boiler?

A

100 parts per million (PPM)

95
Q

what is the dump guideline for conductivity on a chelant boiler?

A

1200 microhms per centimeter (umhos/cm)

96
Q

what is the dump guideline for Chloride on a chelant boiler?

97
Q

what is the maximum allowable difference between the continuous conductivity meter and measured conductivity?

A

10 percent

98
Q

all boiler sample testing must be completed within how many minutes of drawing the sample?

A

thirty minutes

99
Q

why are dump guidelines established for main propulsion boilers?

A

to reduce feedwater consumption on steaming boilers

100
Q

who authorizes the addition of treatment chemicals, during casualty control procedures?

A

engineering officer of the watch

101
Q

what effect does desiccant have on boiler water?

A

increases silica content

102
Q

how is hydrazine stored onboard ship?

A

locked in the appropriate locker in the fireroom, oil king maintains the key

103
Q

what is the volume of the chemical injected into the boiler must be weighed and rounded to the nearest?

A

half ounce

104
Q

what must be worn when mixing trisodium phosphate?

A

face shield

105
Q

what is nitrogen used for in the continuous treatment system?

A

to pressurize the continuous treatment tank and force out treatment solution

106
Q

when it becomes necessary to increase Nitrogen pressure in the continuous treatment tank it is increase in what pressure increments?

107
Q

what type of damage will occur in the boiler with an Alaklinity of zero a phosphate of less than 10?

A

scale formation

108
Q

securing the boiler will stop all damage except what?

A

acid corrosion and oxygen corrosion

109
Q

who must authorize the steaming of a boiler that has conductivity greater than 2,000 umhos/cm?

A

commanding officer

110
Q

how can feedwater bicarbonate contamination be confirmed?

A

by testing the feedwater for phosphate

111
Q

feedwater bicarbonate in the feedwater system is indicated by a phosphate level of what?

A

5 parts per million (PPM) or greater

112
Q

what type of test method is the boiler water phosphate test?

A

volumetric

113
Q

the dissolved oxygen test is an example of what test method?

A

colorimetery

114
Q

what are the two classes of sampling errors?

A

random and systematic

115
Q

if boiler water is inadvertently sampled while a chemical addition is in process and high results are obtained, what type of error has occured?

116
Q

what type of error occurs when a sample is drawn from one part of a liquid, when that liquid is not mixed, and different levels of concentration exist throughout?

A

systematic

117
Q

all feedwater testing shall be completed within?

A

30 minutes of sampling

118
Q

when reading the buret, if the bottom of the meniscus is below a graduated line, how do you read the value?

A

read the next higher value

119
Q

all graduated cylinders used for boiler water and feedwater testing are designated in what manner?

120
Q

what doe sthe acronym TD ona graduated cylinder stand for?

A

to deliver

121
Q

what is the volume of a graduated cylinder?

A

100 milliliters (ml)

122
Q

the bottom of the buret with the stopper in place shall be how far from the bottom of the reagent bottle?

123
Q

what does the term volumetric test method mean?

A

consists of adding a reagent solution of known concentration. from a buret, into a sample of known volume to analyze the concentration

124
Q

what test method is the DR-100 silica test?

A

colorimetery

125
Q

what is the range of the dissolved oxygen comparator?

A

0-40 parts per billion (PPB)

126
Q

what color change can be expected, after adding phenolphthalein to the boiler water sample, when conducting a phosphate test?

A

pink or red

127
Q

the boiler water conductivity test is considered what test method?

A

electrometric

128
Q

what is the preferred temperature of the Alkalinity sample, when conducting a boiler water alkalinity test?

A

20 to 30 degrees C

129
Q

what is used onboard ship to calibrate conductivity and PH meters?

130
Q

when must conductivity meters be calibrated?

A

quarterly and anytime electrical power is interrupted

131
Q

how is the conductivity meter standardized?

A

by performing the boiler conductivity standard test

132
Q

how are bimetallic thermometers checked, when they are first received from the manufacturer?

A

ice bath calibration

133
Q

when preparing nitric acid reagent, how much stock solution is used?

A

50 milliliters (ml)

134
Q

how must mercuric nitrate waste be disposed?

A

by turning the wate into public works or any naval shipyard, and conforming to any local or state disposal requirements

135
Q

how much stock solution is used to prepare mercuric nitrate reagent?

A

20 milliliters(ml)

136
Q

how much isopropyl alcohol is required to prepare phenolphtlein indicator?

A

25 milliliters (ml)

137
Q

how long is prepared phenolphthalein good for?

A

indefinitely

138
Q

what is the expiration date of prepared methyl purple indicator?

139
Q

what amount of the sample is used during the boiler alkalinity/ phosphate test?

A

200 milliliters (ml)

140
Q

what is the expiration date of prepared chloride indicator?

141
Q

what is the conductivity probed stored in?

A

distilled water

142
Q

how many flakes of caustic soda are required to prepare dilute caustic soda indicator?

143
Q

what is available to ascertain the reliabilty of technique and equipment?

144
Q

what are the three times that standards are conducted?

A

quarterly with PMS; when in doubt; when new reagent are prepared

145
Q

what is the only feedwater standard?

A

hardness standard

146
Q

the alkalinity standard has a range of what?

A

5.4 to 6.6 equivalent per million (EPM)

147
Q

all stock and treatment chemicals shall be stored at what temperature?

A

below 100 degrees F

148
Q

where can specific information be found concering boiler water/ feedwater testing and treatment?

A

NSTM 220 V2

149
Q

what will a salinity indiactor panel read in the check position?

A

.261 equivalent per million (EPM)

150
Q

all acids must never be stored with what class of chemicals?

151
Q

what is the flash point of isopropyl alchol?

A

59 degrees F

152
Q

what NSTM covers specific information on stowayge and handling hazardous waste?

153
Q

what shall be worn when conducting a dissolved oxygen test to prevent glass cuts?

A

finger cot

154
Q

all feedwater and boiler water samples, taken to be tested for chloride and hardness, shall be coolef below what temperature?

A

100 degrees F

155
Q

how many drops of chloride indicator are requiredto perform the feedwater chloride test?

A

4 to 6 drops

156
Q

why are dimethylgloxime (DMG) crystals used in the feedwater hardness test?

A

to eliminate nickel preference

157
Q

what is the amount of sample required for the boiler water chloride test?

A

25 mililiters (ml)

158
Q

what is the expiration date of the hydrazine ampoule comparator?

159
Q

automatic sampling is accomplished by what means?

A

conductivity and salinity indiacting cells

160
Q

what is the major interference, in the boiler water alkalinity/phosphate test?

A

absorption of carbon dioxide, which lowers alkalinity

161
Q

what is the amount of sample required to perform the feedwater chloride test?

A

100 milliliters (ml)

162
Q

while performing the boiler water conductivity test, how much sample is required?

A

enough sample to cover the air holes in the conductivity electrode by 1/2 inch

163
Q

who is responsible for all boiler water/feedwater chemistry actions?

A

engineering officer

164
Q

who recommends treatment action based on log entries?

165
Q

who initials any feedwater reading that is out of limits?

A

engineering officer of the watch (EOOW) and the engineering officer

166
Q

who supervises the maintenance of records and reviews the records daily?

A

Leading chief petty offcier (LCPO)

167
Q

who circles any result which is out limits on the boiler water/feedwater logs?

168
Q

who else besides the engineering officer signs the monthly water treatment log cover sheet?

A

commanding officer

169
Q

a complete machinery plant water treatment log package consists of what logs?

A

cover sheet and monthly boiler data sheet; the daily feedwater chemistry worksheet/log; the daily boiler water chemistry worksheet/log; boiler chemical inventory log

170
Q

how long is the machinery water treatment package retained onboard?

171
Q

how longs is the reserve/make up feedwater log retained onboard?

172
Q

how long is the daily fuel and water report retained onboard?

173
Q

what log would have the latest setting, for main feed pump governors?

A

monthly boiler data sheet/log

174
Q

what log lists the latest boiler safety valve settings?

A

monthly boiler data sheet log

175
Q

what log is used for daily salinity/conductivity indiactor comparison readings?

A

the daily feedwater chemistry worksheet/log

176
Q

what log is used for shore source feedwater tests?

A

reserve/makeup feedwater log

177
Q

what log is used to record the ships liquid loading precentages?

A

the daily fuel and water report

178
Q

who sgings the fuel and water report?

A

engineering officer and main propulsion assistant

179
Q

when does the LCPO, MPA, and engineering officer review and initial the boiler water/feedwater chemistry worksheet logs?

180
Q

EDTA is considered what type of cleaning?

A

mechanical

181
Q

on what log would the entry for hours since last acid cleaning be logged?

A

monthly boiler data

182
Q

how many stir rods are stored in the boiler water test cabinet?

183
Q

what is the volume of chloride indiactor dropper bottle?

A

60 milliliters (ml)

184
Q

what is the expiration date for trisodium phosphate?

A

indefinite

185
Q

with few exceptions, what is the normal expiration date for stock chemicals?

186
Q

what is imposed to prevent chemicals from deteriorating in storage?

A

shelf life

187
Q

what is the expiration date of mixed bed ion exchange resin?

A

five years or 60 months

188
Q

what is the expiration date for all standards?

189
Q

how must dissolved oxygen ampules be stored wgen not in use?

A

stored in their box away from the direct light

190
Q

what log would you find the latest boiler hydrostatic tests data for a 150 percent hydrostatic test?

A

monthly boiler data sheet

191
Q

when sending reports to higher authorities, whoa re the reports sent to?

A

type commander, with an information copy set to ISIC, NAVSEA, NAVSSES

192
Q

how is an error corrected on any boiler water/ feedwater log entry?

A

line through the error and initial the error, then enter the correct number

193
Q

when making log entries, what are two allowable writing instruments, that may be used?

A

pen or pencil, when using pencil no erasure is allowed

...my Stuff (18 decks)

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