Measures the water temperature of the boiler and controls the temperature by starting and stopping the boiler.
What is an aquastat.
100
The instantaneous combustion of flammable gases or vapors accumulated in the furnace.
What is a furnace explosion.
100
Have a fine mesh screen and are located on the suction line before the fuel oil pump. The most common is the "Y" and basket type.
What is a fuel oil strainer.
100
The predetermined pressure at which a safety valve opens and remains open until the pressure drops.
What is popping pressure.
100
Is a type of corrosion that causes boiler metal to become brittle.
What is caustic embrittlement?
200
A vented tank located above the heating units that functions as a relief device in a hot water heating system.
What is an expansion tank.
200
This is a pump that quits working due to feedwater flashing to steam.
What is a steambound pump.
200
A mechanical device used to regulate the flow of fuel oil to the burner for controlling the firing rate.
What is a modulating cam.
200
Part of the safety valve that increases the area of the safety valve disc.
What is the huddling chamber.
200
Is a measurement of the concentration of dissolved impurities in the boiler water.
What is total dissolved solids?
300
Meters water from the supply line to the heating unit.
What is a diverter fitting.
300
Is a water pressure test used on a boiler to check for leaks or damage due to a low water condition or after any extensive repairs.
What is a hydrostatioc test.
300
Is the full length of a coal stoker that provides the maximum underfeed combustion area.
What is a retort.
300
A safety valve test used to determine if a safety valve opens at the correct pressure.
What is a pop test.
300
Separates oxygen and other gases from the steam before releasing the gases to the atmosphere.
What is a deaerator?
400
Can also control the temperature in a hot water heating system by automatically blending water returning from the heating units with water supplied from the boiler.
What is 3-way mixing valve.
400
A condition that occurs when a boiler is operating at or above it's MAWP.
What is Boiler overpressure.
400
Controls the amount of steam produced by changing the burner firing rate.
What is a modulating control system.
400
A drop in pressure between popping pressure and reseating pressure.
What is safety valve blowdown. or blowback
400
Added to remove what oxygen is left in the feedwater.
What is sodium sulfite?
500
Activated by the flow of water through the discharge piping from the circulating pump.
What is Water-flow proving switch.
500
Intentionally causes a low water condition to more accurately determine if the low water fuel cutoff is working correctly.
What is an evaporation test?
500
An air pressure actuated switch that closes after proving sufficient pressure of combustion air from the forced draft fan.
What is the air proving switch.
500
Are required to have 2 or more safety valves.
What is Steam boilers having over 500 sqft of heating surface?
500
Is an internal element in some types of deaerators that condenses steam and uses the heat produced to warm feedwater.