Book 1: 3-12 "Routine Boiler Maintenance & Inspection" Flashcards
Chemicals used for the alkaline boil out of a boiler consist of a combination of which of the following.
1. Sodium hydroxide
2. Sodium sulphite
3. Sodium phosphate
4. Sodium carbonate
5. Sodium chloride
Select one:
A. 2, 3, 4
B. 2, 3, 4
C. 1, 2, 3
D. 1, 3, 4
E. 1, 2, 4
D. 1, 3, 4
(Sodium hydroxide, Sodium phosphate, Sodium carbonate)
The boiler inhibited acid cleaning method most commonly uses a 5% solution of inhibited _____ acid.
Select one:
A. Nitric
B. Sulphuric
C. Hydrochloric
D. Carbonic
E. Acetic
C. Hydrochloric
The dye penetrant, entrapped in a crack, is brought to the surface by the action of the:
Select one:
A. Black light
B. Dye penetrant
C. Ultrasound
D. Ultraviolet light
E. Developer
E. Developer
In the case of a firetube boiler, the scale will be formed on the outside surfaces of the tubes and may be removed by passing a _____ through the tubes.
Select one:
A. Tube cleaner
B. Disc grinder
C. Scale cutter
D. Wire brush
E. Vibrating hammer or “rattler”
E. Vibrating hammer or “rattler”
When the boiler water has cooled to about _____ open the blowdown valves and drain the boiler.
Select one:
A. 99°C (210°F)
B. 134°C (273°F)
C. 90°C (194°F)
D. 110°C (230°F)
E. 60°C (140°F)
C. 90°C (194°F)
Whenever there are signs of a tube leak during boiler operation:
Select one:
A. Reduce the firing rate to the minimum
B. Watch that it does not get worse
C. Close the stop valve on the steam outlet
D. Shut down the boiler immediately
E. Maintain a steady firing rate
D. Shut down the boiler immediately
Tubes adjacent to sootblowers are examined for signs of _____ due to direct impingement of steam from the blowers.
Select one:
A. Erosion
B. Overheating
C. Oxygen pitting
D. Corrosion
E. Caustic embrittlement
A. Erosion
Tubes and tube sheets should be inspected for scale formation and:
Select one:
A. Trueness
B. Erosion
C. Pitting
D. Corrosion
E. Alignment
C. Pitting
When inspecting the fireside of the boiler the surfaces are examined for bulges or blisters which would indicate:
Select one:
A. Corrosion
B. Oxygen pitting
C. Overheating
D. Erosion
E. Caustic embrittlement
C. Overheating
Standard antifriction bearings normally require lubrication once every _____ year/s.
Select one:
A. 5
B. 1
C. 2
D. 4
E. 3
B. 1
Overheating of the tube wall may be caused by all but:
Select one:
A. Low excess air
B. Heavy scale forming on the tubes
C. Failure of the low water fuel cut-off
D. An excessive firing rate
E. Poor water circulation
A. Low excess air
Black light is the popular name for invisible light in the near _____ range of wave lengths.
Select one:
A. Green light
B. Infrared
C. Ultraviolet
D. Violet light
E. Ultrasonic
C. Ultraviolet
In the wet boiler lay up method after the boiler water has cooled it is filled:
Select one:
A. To half a gauge glass
B. To the bottom of the gauge glass
C. To the top of the gauge glass
D. To half fill the boiler
E. Completely
E. Completely
Although cast iron is a _____ material that cracks relatively easily, it has proven to be a satisfactory material for low-pressure boilers.
Select one:
A. Strong
B. Malleable
C. Brittle
D. Ductile
E. Fragile
C. Brittle
Sealed antifriction bearings usually don’t require additional lubrication for a period of _____ years.
Select one:
A. 1
B. 5
C. 3
D. 4
E. 2
C. 3
Repairs affecting the pressure parts of a boiler may only be made after consultation with and the approval of:
Select one:
A. The Chief Engineer
B. The authorized inspector
C. A qualified welder
D. The Shift Engineer
E. A Professional Engineer
B. The authorized inspector
During inhibited acid cleaning the boiler must be adequately vented because _____ is produced by the reaction of acid with iron and could cause a fire or explosion.
Select one:
A. Hydrogen
B. Nitrogen
C. Carbon dioxide
D. Oxygen
E. Carbon monoxide
A. Hydrogen
If damp conditions exist during the idle season, the metal surfaces should be painted with a protective coating such as:
Select one:
A. Fuel oil
B. Grease
C. Light oil
D. Oil based paint
E. Latex paint
C. Light oil
In the wet boiler lay up method chemicals are added to bring the boiler water to the required:
Select one:
A. TDS
B. pH
C. Excess oxygen scavenger level
D. Acidity
E. Density
C. Excess oxygen scavenger level
Hydrostatic testing of a boiler requires that the pressure be raised to _____ the Maximum Allowable Working Pressure stamped on the boiler.
Select one:
A. 1.5 times
B. 2.0 times
C. 1.0 times
D. 0.5 times
E. 1.25 times
A. 1.5 times
Power Engineers (boiler operators) are generally not called upon to make any boiler repairs they are usually done by an experienced:
Select one:
A. Plumber
B. Steam fitter
C. Boilermaker
D. Millwright
E. Carpenter
C. Boilermaker
After cleaning, cast-iron boilers should be left completely filled with _____ in order to reduce corrosion.
Select one:
A. A slightly basic solution
B. A mixture of oil and antifreeze
C. Light oil
D. A slightly acidic solution
E. Water
E. Water
In the circulating method, the acid solution is circulated continuously through the unit at a temperature of about _____ until the cleaning action is completed as shown by tests.
Select one:
A. 120°C (248°F)
B. 50°C (98°F)
C. 100°C (212°F)
D. 65°C (150°F)
E. 77°C (170°F)
D. 65°C (150°F)
Leakage of a few drops a minute leakage from the packing gland of circulating pumps is desirable to prevent drying out of packing and:
Select one:
A. Over cooling of the shaft
B. Corrosion of the shaft
C. Prevent ingress of air
D. Scoring of the shaft
E. Creating to large a mess
D. Scoring of the shaft
