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