Chapter 19 Basic Boiler Operation Flashcards
A hot water heating system automatic fill valve will
a) sense expansion tank level
b) maintain system pressure, regardless of level
c) maintain boiler water level at some predetermined value
d) prevent the boiler from tripping on low water level
b) maintain system pressure, regardless of level
Prior to starting a new boiler for the first time it is common practice to:
a) establish a main flame first to ensure the controls function properly
b) ensure all controls work before contacting an inspector
c) “boil out” the waterside with chemicals to remove oil, etc,
d) test the safety or relief valve first
c) “boil out” the waterside with chemicals to remove oil, etc,
Boiler stack temperature is rising due to soot build-up on the boiler tubes. This could
a) result in condensation forming in the flue gas system
b) cause the water level to drop to the trip level
c) cause foaming of the boiler water
d) cause a furnace explosion
d) cause a furnace explosion
When doing routine checks on a hot water system one thing that is often overlooked is
a) system pressure
b) expansion tank level
c) unusual noises
d) fuel pressure
c) unusual noises
Two conditions that may occur during warm-up of a cold boiler are smoking and
a) fuel flow surging
b) flame pulsations
c) very high stack temperatures
d) flue gas condensation
d) flue gas condensation
A boiler item that should be checked monthly is
a) refractory
b) fireside cleanliness
c) the flame detection system
d) water outlet temperature
c) the flame detection system
If maintenance is planned for a hot water boiler, it should be drained:
a) only after it has cooled down
b) as soon as possible after removal from service
c) with the vent valve closed
d) while using cold feedwater to cool it
a) only after it has cooled down
A hot water boiler should be equipped with water supply and return valves so that
a) it can be drained without draining the system
b) it cannot be isolated from the system
c) the system can be drained through the boiler
d) boiler pressure will not be applied to the system
a) it can be drained without draining the system
During the filling of an empty boiler, a valve that should be open to allow the air to escape is the
a) gauge glass steam valve
b) boiler drain valve
c) boiler vent valve
d) gauge glass drain valve
c) boiler vent valve
Which of the following is done to prevent excessive stresses of boiler metal due to uneven expansion?
a) Warm a boiler up as quickly as possible
b) Open the safety valve slowly during a test
c) Warm the boiler up before filling it with water
d) Warm the boiler up as slowly as possible
d) Warm the boiler up as slowly as possible
If boiler water level has dropped below the gauge glass during boiler operation, the operator is to
a) contact the boiler inspector immediately
b) shut down, cool, and then inspect the boiler for damage before refilling.
c) immediately restore water level before shutting off the unit
d) open the blowdown valves in order to have the low water fuel cut-off trip the unit
b) shut down, cool, and then inspect the boiler for damage before refilling.
Some of the reasons why heating boiler accidents occur are:
a) the misconception that no supervision is required for automatically-fired boilers
b) the inexperience or lack of training of operating personnel
c) inadequate maintenance of boilers and controls
d) All of the above
d) All of the above
The most important factor to be considered during steam boiler operation is
a) housekeeping
b) water level
c) steam pressure
d) combustion quality
b) water level
When removing a steam boiler from service, the vent valve should be opened at 15-20 kPa to
a) permit draining of the boiler while it is still hot
b) let the 02 within the boiler escape
c) maintain the boiler water level at operating level
d) prevent a vacuum from forming in the boiler
d) prevent a vacuum from forming in the boiler
