Boiler Water/ Feedwater Flashcards
what log would you find the boiler hydrostatic test data for a 150 percent hydrostatic test?
monthly boiler data sheet
when sending reports to higher authorities, who are the reports sent to?
Type commander, with an information copy sent to ISIC, NAVSEA, and NAVSSES
how is an error corrected on any boiler water/ feedwater log entry ?
line through the error and initial the error, then enter the correct number
the continuous treatment solution is prepared using Trisodium or Disodium Phosphate, hydrazine and what other chemical?
Tetrasodium EDTA
boilers operating at 700 psig or less use wha specific chemical for continuous treatment?
trisodium phosphate
disodium phosphate is used in the continuous system for boilers operating at what pressure?
1200 psig
what is sued to pressurize the mixing tank and helps feed the treatment solution to the DFT?
nitrogen pressure
the treatment solution is continuously fed to the DFT and is directly proportional to what?
feed flow
what is used to form the protective magnetite layer in the CHELANT treatment system?
Tetrasodium EDTA
what chemical is used as an oxygen scavenger in the CHELANT system?
7% hydrazine
hydrazine has what effect on the protective magnetite layer?
hydrazine enhances the magnetite layer
hydrazine decomposes to Ammonia at what temperature?
above 600 F
since the CHELANT treatment is continuously injected, what is required to prevent excessive build up of treatment chemicals, as well as, to remove contaminants?
continuous blowdown
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?
4%
what are the three chemicals used to provide alkalinity under the CHELANT treatment system?
Trisodium EDTA, Trisodium Phosphate, Sodium Hydroxide
sodium hydroxide is also known by what term?
caustic soda
how are high levels of alkalinity controlled in the CHELANT system?
by blowdown
operating ships using CHELANT treatment shall not use what chemical, due to its volatile reaction with hydrazine?
sodium nitrite
sodium nitrate is not used in the CHELANT treatment system because it is incompatible with what other chemical?
hydrazine
IMA and industrial activities may use sodium nitrite for what purposes?
water jet cleaning, hydrostatic testing, wet layup, and prior to dry layup
the CHELANT system eliminates the need to perform what feedwater test?
Feedwater PH test
what is the only additional feedwater test in the CHELANT system?
feedwater hydrazine test
what is the range of the Chelant feedwater test?
10-40 PPB
what is the periodicity of the feedwater Hydrazine test, when taking an after on the line sample?
8-10 hours AOL
once an after on the line sample has been taken, the feedwater Hydrazine east is performed at what interval?
daily
the continuous treatment tank holds what quantity of treatment solution?
30 gallons
the continuous treatment system alarms when the treatment solution falls to what level?
5 gallons
what happens to the continuous treatment tank, when the treatment level reaches 2 gallons
a solenoid valve closes, securing flow to the DFT
what must be done to the continuous treatment tank when the level reaches 2 gallons?
the continuous treatment must be reinitiated
the continuous treatment tank shall be filled within what time frame when the 2 gallon level is reached?
within 1 hour
what amount of hydrazine is used when preparing a new tank of treatment solution?
1 gallon
proper preparation of the treatment solution will flush the Hydrazine bottle with at least how many gallons of condensate?
25 gallons
the feedwater used to prepare the continuous treatment solution must be less than what temperature, to prevent melting of the hydrazine bottle?
200 degrees F
what is the only required chemical that can be used for freshly filled and treating boilers within the Chelant system?
Trisodium phosphate (TSP)
what are the four boiler water tests that are conducted within the Chelant system?
alkalinity, phosphate, conductivity, chloride
when testing a boiler water sample within the Chelant system what is the required order of testing?
conductivity, alkalinity, phosphate, chloride
at what periodicity is an after online sale drawn on a steaming boiler with the Chelant system?
within 30 minutes AOL
what is the alkalinity range for a boiler water sample under the chelant system?
.100 to 1.00 epm
what is the phosphate range for a chelant boiler water sample?
10 to 40 ppm
what is the maximum conductivity for a chelant boiler water sample?
500 umhos/cm
how often are bottom blowdown conducted under the chelant system?
every 360 steaming hours, anytime the boiler is cured longer than 2 hours and not to exceed 24 hours when suspended solids are present
how often are scum blowdowns performed?
following the first within limits sample after coming online and every 168 to 192 steaming hours
what is the sample periodicity of a prior to securing sample on a chelant boiler?
90 minutes prior to securing
who must be notified if the continuous conductivity reading is greater than 50 umhos/cm in any given hour?
EOOW and oil king
what would be an indication of a desuperheater leak when analyzing a phosphate test result?
a reading of greater than 10 ppm
what action must be taken if a boiler is steamed without continuous treatment for more than 168 steaming hours since the last waterside inspection?
the boiler must be inspected at the next availability or within 2, 000 steaming hours since the last waterside inspection
who must be notified if the continuous treatment system cannot be repaired within 168 steaming hours?
TYCOM by message with INFo to ISIC, NAVSEA and NAVSURFWARCEN
during a serious contamination incident the boiler must be sampled at what interval?
15-30 minutes after chemical addition or blowdown until realist are back within limits
in the absence of contamination, how would a zero alkalinity or phosphate reading following boiler light off be handled?
treat as if significant damage has occurerd
what boiler water alacrity reading is considered to cause significant boiler damage?
alkalinity of zero or greater than 2.000 epm
what boiler water phosphate reading is considered to cause significant boiler damage?
phosphate of zero ppm
what boiler water conductivity reading is considered to cause significant boiler damage?
conductivity of more than 2,000 umhos/cm
a feedwater dissolved oxygen reading in excess of what is considered significant boiler damage?
greater than 40 ppm for more than 2 hours after detection
what two types of contamination securing the boiler cannot stop?
dissolved oxygen and acidic corrosion
serious boiler water contamination is defined as what?
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
when will boiler scale formation occur in a steaming boiler?
with an alkalinity less than .050 epm and a phosphate of less than 5 ppm
when will acid corrosion occur in a steaming boiler?
when alkalinity is zero
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
treat IAW normal dosage tables if no other serious contamination criteria are met
who is the only person who can authorize continued steaming of a boilerr that is experiencing significant damage?
commanding officer
what effect will seawater have on boiler water parameters?
decrease alkalinity, decrease phosphate, and increase conductivity and chloride
what effect will shore water have on boiler water parameters?
increase alkalinity, decrease phosphate, and increase conductivity and chloride may or may not change
if an improperly functioning DFT cannot be corrected within how many hours the boiler must be secured?
8 hours
what are two major hardness constituents and the primary sources of scale in boilers and feed piping?
calcium and magnesium
stainless steel under stress when subjected to large amounts of chloride and oxygen will suffer what type of damage?
trans granular cracking of its crystals
lubricating oil within a steaming boiler will cause what detrimental effect to the boiler tubes?
baked on carbonaceous deposits
define the term foaming
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
define the term priming
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
what type of boiler tube corrosion is associated with many pits and tubercles?
dissolved oxygen
what type of corrosion causes overall wall thinning of boiler tubes?
acidic corrosion
what type of corrosion occurs underneath water deposits at the lower bed of the screen tubes?
caustic corrosion
what is the maximum boiler water silica limit on a 1200 psi boiler?
greater than 5 ppm
what is the maximum boiler water silica limit on a 600 psi boiler?
greater than 30 ppm
a silica level in excess of ppm will have what effect on the boiler water phosphate test?
phosphate results will be exceedingly high
a drop in all boiler water parameters is an indication of what?
leakage of boiler water
what forms the boiler magnetite layer when the CHELANT treatment system installed?
trisodium EDTA
what chemical within the continuous treatment system enhances the magnetite layer?
hydrazine
hydrazine will decompose at what temperature?
600 degrees F
what boiler lay up chemical is incompatible with the continuous system?
sodium nitrate
when is the continuous treatment for started?
within 30 minutes of when the first boiler in the space is placed online
when is the continuous treatment flow secured?
within 2 hours after fires are out on the last boiler
the nitrogen pressure on the mixing tank is set within what range?
30-60 psig
if treatment chemicals or their solutions enter the eyes, what action must be taken?
flush with cold water for 15 minutes lifting the upper and lower eye lids alternately and obtain immediate medical attention
what is the hydrazine concentration range for a boiler under a hydrazine lay up?
20- 70 ppm
when applying a ship’s force hydrazine lay up what is the required quantity of morpholine?
1/2 quart
when mixing the hydrazine lay up solution, what is the quantity of treatment solution to gallons of feedwater?
30 gallons of solution per 2,000 gallons of feedwater
hydrazine lay up solution must be disposed of IAW what document?
NSTM 593
what action must be taken if you suspect a malfunctioning injection system?
check the flow rate and correct as necessary
how is stock hydrazine stored?
stored upright in a locked cabinet. the cabinet must be full at all times to prevent movement and spillage
a shower/ eyewash shall be installed within how many feet of the injection system?
ten feet
what is the range of the hydrazine comparator that is used in the hydrazine feedwater test?
0 -500 ppb
when conducting the feedwater hydrazine test, how long must you wait for the full color to develop?
ten minutes
what is the range of error when conducting the feedwater hydrazine test?
plus or minus 10 ppb
what is the range of error when conducting the boiler lay up hydrazine test?
plus or minus 10 ppm
what is the range of the hydrazine comparator that is used to conduct the boiler lay up hydrazine test?
0 - 100 ppm
excess morpholine following a hydrazine lay up will have what effect on the boiler alkalinity / phosphate test?
cause false alkalinity and false high phosphate results
if dilute caustic soda is required when performing the boiler alkalinity and phosphate test, how is it logged?
by annotating “cs” in the ml phenolphthalein column
if dilute caustic soda is required when conducting the boiler water/ phosphate test, what must you as the operator be aware of?
that the use of caustic soda may cause a false high phosphate reading, this is due to sodium carbonate contamination of the caustic soda
what is the range of error when conducting the boiler water phosphate test?
plus or minus 2.5 ppm
what NSTM covers all boiler water and feedwater testing requirements?
NSTM 220 V2
what NSTM covers chemical and analytical boiler water and feedwater properties?
NSTM 220 V1
