Chapter 9-12 Flashcards
- All new boilers, and boilers which have been repaired on their pressure parts, require a _____ to be performed upon them.
A) acidifying B) descaling C) hydrostatic test D) refractory dry out E) soot blowing
C) hydrostatic test
- On small boilers, a hydrostatic test is done with:
A) compressed nitrogen B) water pressure C) steam pressure D) compressed air E) acetic acid
B) water pressure
- When a hydrostatic test is done on a boiler, the pressure shall be under control at all times, so that the required test pressure is never exceeded by more than:
A) 0.1 B) 0.06 C) 0.05 D) 0.04 E) 0
C) 0.05
- All traces of oil or grease must be removed from a boiler by boiling out with:
A) a suitable acid B) hot water C) a suitable alkali D) a suitable solvent E) sodium sulphite and hydrazine
C) a suitable alkali
- After construction of the boiler setting, the refractories will contain a considerable amount moisture. Referring to this situation, which of the following statements are correct?
1) the refractories should be dried out as fast as possible
2) the refractories should be dried slowly
3) if the refractories are dried too slowly, large cracks will appear
4) if the refractories are dried too quickly, the refractories will crack
A) 1,3 B) 2,4 C) 1 D) 2 E) 3
B) 2,4
- An alkaline boilout is used on a boiler:
A) when the boiler has had oil contamination
B) before overhauls
C) after an acid clean
D) before returning the boiler to service after an overhaul
E) after an acid clean
A) when the boiler has had oil contamination
- _____ storage is preferable for boilers that are out of service for an extended period of time or in locations where freezing temperatures.
A) dry
B) short
C) wet
D) long
A) dry
- Moisture absorbing materials should be placed on trays inside the drums to absorb moisture from the _____.
A) metal
B) tubes
C) air
D) fuel
C) air
- Inert gas, such as nitrogen, is connected to the drum vent to maintain approximately _____ kPa. Positive pressure.
A) 100
B) 35
C) 325
D) 500
B) 35
- Wet storage is used if the standby boiler may be required for service at _____ notice.
A) dry
B) short
C) wet
D) long
B) short
- Oxen scavengers are added to water to increase the _____ and to absorb any oxygen present in the feedwater.
A) pH
B) solids
C) alkalinity
D) conductivity
C) alkalinity
- The _____ valve on the shut down boiler will close when the Boiler pressure drops below the header pressure.
A) fuel
B) feedwater
C) header
D) non return
D) non return
- When the pressure in the boiler steam drum drops to _____ kPa, the drum vents are to be opened to avoid the formation of a vacuum within the boiler.
A) 170
B) 500
C) 5
D) 1000
A) 170
- The fireside of the boiler is cleaned of all dust and soot by washing with a hot _____ solution of water.
A) acidic
B) alkaline
C) caustic
D) soapy
B) alkaline
- The waterside of the boiler is not washed until the _____ has examined and determined the amount of sludge and scale present.
A) manager
B) worker
C) inspector
D) owner
C) inspector
- During the high pressure flush, the blowdown valves should be disconnected, if possible, to prevent them fro getting plugged with _____.
A) water
B) rust
C) dirt
D) scale
D) scale
- When examining waterside surfaces, the inspector looks for signs of corrosion, pitting, and _____ of the metal.
A) bulging
B) blisters
C) cracking
D) wearing
C) cracking
- _____ is the result of dissolved oil or oxygen in the feedwater.
A) scale
B) pitting
C) cracking
D) bulging
B) pitting
- When inspecting the fireside of the boiler, the tube and drum surfaces are examined for bulges or blisters, which indicate _____.
A) drying
B) drafting
C) overheating
D) underheating
C) overheating
- Refractory and brickwork of the burners, baffles, and furnace walls are checked for _____.
A) cracks
B) discoloring
C) melting
D) deterioration
D) deterioration
- The dampers and air registers ar checked for _____ and to ensure they move freely.
A) holes
B) dust
C) warpage
D) design
C) warpage
- When performing an internal inspection of a boiler, examine the waterside through all the handhole doors for:
A) tube pitting B) carbon deposits C) moisture D) process contamination E) small salt traces
A) tube pitting
- After an acid clean on a boiler, the boiler is flushed with an alkaline solution such as:
A) lime B) citrus C) molybdenum D) soda ash E) caustic soda
D) soda ash
- Internal boiler cleaning is usually preceded by:
A) a hydrostatic test B) an internal inspection C) an external inspection D) an overhaul E) retubing
B) an internal inspection