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...my Stuff > Boiler Water/ Feedwater > Flashcards

Boiler Water/ Feedwater Flashcards

1
Q

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

A

monthly boiler data sheet

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2
Q

when sending reports to higher authorities, who are the reports sent to?

A

Type commander, with an information copy sent to ISIC, NAVSEA, and NAVSSES

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3
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

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4
Q

the continuous treatment solution is prepared using Trisodium or Disodium Phosphate, hydrazine and what other chemical?

A

Tetrasodium EDTA

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5
Q

boilers operating at 700 psig or less use wha specific chemical for continuous treatment?

A

trisodium phosphate

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6
Q

disodium phosphate is used in the continuous system for boilers operating at what pressure?

A

1200 psig

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7
Q

what is sued to pressurize the mixing tank and helps feed the treatment solution to the DFT?

A

nitrogen pressure

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8
Q

the treatment solution is continuously fed to the DFT and is directly proportional to what?

A

feed flow

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9
Q

what is used to form the protective magnetite layer in the CHELANT treatment system?

A

Tetrasodium EDTA

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10
Q

what chemical is used as an oxygen scavenger in the CHELANT system?

A

7% hydrazine

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11
Q

hydrazine has what effect on the protective magnetite layer?

A

hydrazine enhances the magnetite layer

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12
Q

hydrazine decomposes to Ammonia at what temperature?

A

above 600 F

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13
Q

since the CHELANT treatment is continuously injected, what is required to prevent excessive build up of treatment chemicals, as well as, to remove contaminants?

A

continuous blowdown

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14
Q

continuous blowdown is accomplished by a low controlled flow of boiler water through the boiler sample cooler to the bilge; this continuous flow attributes to what daily loss of feed water?

A

4%

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15
Q

what are the three chemicals used to provide alkalinity under the CHELANT treatment system?

A

Trisodium EDTA, Trisodium Phosphate, Sodium Hydroxide

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16
Q

sodium hydroxide is also known by what term?

A

caustic soda

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17
Q

how are high levels of alkalinity controlled in the CHELANT system?

A

by blowdown

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18
Q

operating ships using CHELANT treatment shall not use what chemical, due to its volatile reaction with hydrazine?

A

sodium nitrite

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19
Q

sodium nitrate is not used in the CHELANT treatment system because it is incompatible with what other chemical?

A

hydrazine

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20
Q

IMA and industrial activities may use sodium nitrite for what purposes?

A

water jet cleaning, hydrostatic testing, wet layup, and prior to dry layup

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21
Q

the CHELANT system eliminates the need to perform what feedwater test?

A

Feedwater PH test

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22
Q

what is the only additional feedwater test in the CHELANT system?

A

feedwater hydrazine test

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23
Q

what is the range of the Chelant feedwater test?

A

10-40 PPB

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24
Q

what is the periodicity of the feedwater Hydrazine test, when taking an after on the line sample?

A

8-10 hours AOL

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25
Q

once an after on the line sample has been taken, the feedwater Hydrazine east is performed at what interval?

A

daily

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26
Q

the continuous treatment tank holds what quantity of treatment solution?

A

30 gallons

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27
Q

the continuous treatment system alarms when the treatment solution falls to what level?

A

5 gallons

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28
Q

what happens to the continuous treatment tank, when the treatment level reaches 2 gallons

A

a solenoid valve closes, securing flow to the DFT

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29
Q

what must be done to the continuous treatment tank when the level reaches 2 gallons?

A

the continuous treatment must be reinitiated

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30
Q

the continuous treatment tank shall be filled within what time frame when the 2 gallon level is reached?

A

within 1 hour

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31
Q

what amount of hydrazine is used when preparing a new tank of treatment solution?

A

1 gallon

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32
Q

proper preparation of the treatment solution will flush the Hydrazine bottle with at least how many gallons of condensate?

A

25 gallons

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33
Q

the feedwater used to prepare the continuous treatment solution must be less than what temperature, to prevent melting of the hydrazine bottle?

A

200 degrees F

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34
Q

what is the only required chemical that can be used for freshly filled and treating boilers within the Chelant system?

A

Trisodium phosphate (TSP)

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35
Q

what are the four boiler water tests that are conducted within the Chelant system?

A

alkalinity, phosphate, conductivity, chloride

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36
Q

when testing a boiler water sample within the Chelant system what is the required order of testing?

A

conductivity, alkalinity, phosphate, chloride

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37
Q

at what periodicity is an after online sale drawn on a steaming boiler with the Chelant system?

A

within 30 minutes AOL

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38
Q

what is the alkalinity range for a boiler water sample under the chelant system?

A

.100 to 1.00 epm

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39
Q

what is the phosphate range for a chelant boiler water sample?

A

10 to 40 ppm

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40
Q

what is the maximum conductivity for a chelant boiler water sample?

A

500 umhos/cm

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41
Q

how often are bottom blowdown conducted under the chelant system?

A

every 360 steaming hours, anytime the boiler is cured longer than 2 hours and not to exceed 24 hours when suspended solids are present

42
Q

how often are scum blowdowns performed?

A

following the first within limits sample after coming online and every 168 to 192 steaming hours

43
Q

what is the sample periodicity of a prior to securing sample on a chelant boiler?

A

90 minutes prior to securing

44
Q

who must be notified if the continuous conductivity reading is greater than 50 umhos/cm in any given hour?

A

EOOW and oil king

45
Q

what would be an indication of a desuperheater leak when analyzing a phosphate test result?

A

a reading of greater than 10 ppm

46
Q

what action must be taken if a boiler is steamed without continuous treatment for more than 168 steaming hours since the last waterside inspection?

A

the boiler must be inspected at the next availability or within 2, 000 steaming hours since the last waterside inspection

47
Q

who must be notified if the continuous treatment system cannot be repaired within 168 steaming hours?

A

TYCOM by message with INFo to ISIC, NAVSEA and NAVSURFWARCEN

48
Q

during a serious contamination incident the boiler must be sampled at what interval?

A

15-30 minutes after chemical addition or blowdown until realist are back within limits

49
Q

in the absence of contamination, how would a zero alkalinity or phosphate reading following boiler light off be handled?

A

treat as if significant damage has occurerd

50
Q

what boiler water alacrity reading is considered to cause significant boiler damage?

A

alkalinity of zero or greater than 2.000 epm

51
Q

what boiler water phosphate reading is considered to cause significant boiler damage?

A

phosphate of zero ppm

52
Q

what boiler water conductivity reading is considered to cause significant boiler damage?

A

conductivity of more than 2,000 umhos/cm

53
Q

a feedwater dissolved oxygen reading in excess of what is considered significant boiler damage?

A

greater than 40 ppm for more than 2 hours after detection

54
Q

what two types of contamination securing the boiler cannot stop?

A

dissolved oxygen and acidic corrosion

55
Q

serious boiler water contamination is defined as what?

A

alkalinity reading of less than .050 epm or greater than 1.500 epm, phosphate of less than 5 ppm, conductivity more than 1,500 umhos/cm and dissolved oxygen in the feedwater exerting the boiler is greater than 15 ppb for more than 4 hours after detection

56
Q

when will boiler scale formation occur in a steaming boiler?

A

with an alkalinity less than .050 epm and a phosphate of less than 5 ppm

57
Q

when will acid corrosion occur in a steaming boiler?

A

when alkalinity is zero

58
Q

what action must be taken if the after on the line boiler water sample has a alkalinity reading of less than .050 epm or a phosphate reading of less than 5 ppm

A

treat IAW normal dosage tables if no other serious contamination criteria are met

59
Q

who is the only person who can authorize continued steaming of a boilerr that is experiencing significant damage?

A

commanding officer

60
Q

what effect will seawater have on boiler water parameters?

A

decrease alkalinity, decrease phosphate, and increase conductivity and chloride

61
Q

what effect will shore water have on boiler water parameters?

A

increase alkalinity, decrease phosphate, and increase conductivity and chloride may or may not change

62
Q

if an improperly functioning DFT cannot be corrected within how many hours the boiler must be secured?

A

8 hours

63
Q

what are two major hardness constituents and the primary sources of scale in boilers and feed piping?

A

calcium and magnesium

64
Q

stainless steel under stress when subjected to large amounts of chloride and oxygen will suffer what type of damage?

A

trans granular cracking of its crystals

65
Q

lubricating oil within a steaming boiler will cause what detrimental effect to the boiler tubes?

A

baked on carbonaceous deposits

66
Q

define the term foaming

A

the formation of stabilized bubbles at the water level in the steam drum caused by excessive dissolved and suspended solids. this results in a continuous, small amount of boiler water carrying over with the steam

67
Q

define the term priming

A

slugs off boiler water, large or small, associated with the steam coming from the steam drum. priming is a mechanical problem and is caused by rough weather and sudden increase in steam consumption

68
Q

what type of boiler tube corrosion is associated with many pits and tubercles?

A

dissolved oxygen

69
Q

what type of corrosion causes overall wall thinning of boiler tubes?

A

acidic corrosion

70
Q

what type of corrosion occurs underneath water deposits at the lower bed of the screen tubes?

A

caustic corrosion

71
Q

what is the maximum boiler water silica limit on a 1200 psi boiler?

A

greater than 5 ppm

72
Q

what is the maximum boiler water silica limit on a 600 psi boiler?

A

greater than 30 ppm

73
Q

a silica level in excess of ppm will have what effect on the boiler water phosphate test?

A

phosphate results will be exceedingly high

74
Q

a drop in all boiler water parameters is an indication of what?

A

leakage of boiler water

75
Q

what forms the boiler magnetite layer when the CHELANT treatment system installed?

A

trisodium EDTA

76
Q

what chemical within the continuous treatment system enhances the magnetite layer?

A

hydrazine

77
Q

hydrazine will decompose at what temperature?

A

600 degrees F

78
Q

what boiler lay up chemical is incompatible with the continuous system?

A

sodium nitrate

79
Q

when is the continuous treatment for started?

A

within 30 minutes of when the first boiler in the space is placed online

80
Q

when is the continuous treatment flow secured?

A

within 2 hours after fires are out on the last boiler

81
Q

the nitrogen pressure on the mixing tank is set within what range?

A

30-60 psig

82
Q

if treatment chemicals or their solutions enter the eyes, what action must be taken?

A

flush with cold water for 15 minutes lifting the upper and lower eye lids alternately and obtain immediate medical attention

83
Q

what is the hydrazine concentration range for a boiler under a hydrazine lay up?

A

20- 70 ppm

84
Q

when applying a ship’s force hydrazine lay up what is the required quantity of morpholine?

A

1/2 quart

85
Q

when mixing the hydrazine lay up solution, what is the quantity of treatment solution to gallons of feedwater?

A

30 gallons of solution per 2,000 gallons of feedwater

86
Q

hydrazine lay up solution must be disposed of IAW what document?

A

NSTM 593

87
Q

what action must be taken if you suspect a malfunctioning injection system?

A

check the flow rate and correct as necessary

88
Q

how is stock hydrazine stored?

A

stored upright in a locked cabinet. the cabinet must be full at all times to prevent movement and spillage

89
Q

a shower/ eyewash shall be installed within how many feet of the injection system?

A

ten feet

90
Q

what is the range of the hydrazine comparator that is used in the hydrazine feedwater test?

A

0 -500 ppb

91
Q

when conducting the feedwater hydrazine test, how long must you wait for the full color to develop?

A

ten minutes

92
Q

what is the range of error when conducting the feedwater hydrazine test?

A

plus or minus 10 ppb

93
Q

what is the range of error when conducting the boiler lay up hydrazine test?

A

plus or minus 10 ppm

94
Q

what is the range of the hydrazine comparator that is used to conduct the boiler lay up hydrazine test?

A

0 - 100 ppm

95
Q

excess morpholine following a hydrazine lay up will have what effect on the boiler alkalinity / phosphate test?

A

cause false alkalinity and false high phosphate results

96
Q

if dilute caustic soda is required when performing the boiler alkalinity and phosphate test, how is it logged?

A

by annotating “cs” in the ml phenolphthalein column

97
Q

if dilute caustic soda is required when conducting the boiler water/ phosphate test, what must you as the operator be aware of?

A

that the use of caustic soda may cause a false high phosphate reading, this is due to sodium carbonate contamination of the caustic soda

98
Q

what is the range of error when conducting the boiler water phosphate test?

A

plus or minus 2.5 ppm

99
Q

what NSTM covers all boiler water and feedwater testing requirements?

A

NSTM 220 V2

100
Q

what NSTM covers chemical and analytical boiler water and feedwater properties?

A

NSTM 220 V1

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