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Boiler- & Burner-Related Glossary Terms
Trying to learn your way around your boiler? These terms are a great place to start.
There are currently 45 names in this directory beginning with the letter S.
An automatic, full-open, pop-action valve that is opened by an overpressure in a boiler and used to relieve the overpressure before damage occurs.
safety valve blowdown
A drop in pressure between popping pressure and reseating pressure as a safety valve relieves boiler overpressure. Also known as safety valve blowback.
safety valve capacity
The amount of steam that can be relieved by a safety valve, measured in the number of pounds of steam per hour it is capable of discharging under a given pressure.
An accumulation of compounds like calcium carbonate and magnesium carbonate on the water side of the heating surfaces of a boiler.
The air supplied to the furnace by draft fans to control combustion efficiency by controlling how completely the fuel is burned.
selective catalytic reduction (SCR)
An emissions control method in which ammonia gas is introduced over a catalyst located in a module that is installed in the boiler exhaust stack.
Stress that occurs when two forces of equal intensity act parallel to each other but in opposite directions.
The process where the water level in a boiler momentarily drops with a decrease in steam demand.
A modulating control strategy that uses steam pressure as the input signal and outputs a signal to a modulating motor that turns a jackshaft to modulate the air and fuel flow.
A device used to remove soot deposits from around tubes and permit better heat transfer in the boiler.
The ratio of the weight of a given volume of a substance to the weight of the same volume of water at a standard temperature of 60°F.
The process where a material can self-generate heat until its ignition point is reached.
A stoker that feeds the coal into the boiler in suspension and on the grate. Also known as an overfeed stoker or sprinkler stoker.
squirrel cage blower
A blower with a wheel that has blades attached at the rim and rotates in a housing.
state implementation plan (SIP)
A plan that gives the states the responsibility for developing their own programs to reduce air pollution.
steam atomizing burner
A fuel oil burner that sends steam and pressurized fuel oil through a nozzle into the furnace where the vaporized fuel mixes with air and is ignited.
The condition where steam strikes a metal surface, causing erosion of that surface.
steam pressure gauge
A boiler fitting that displays the amount of pressure inside a boiler, steam line, or other pressure vessel.
A device located in the steam drum of a boiler used to increase the quality of steam. Also known as a drum internal.
An accessory that removes air and non condensable gasses and condensate from steam lines and heat exchangers without a loss of steam.
A rotary mechanical device used to drive rotating equipment, such as a generator, by extracting thermal energy from pressurized steam.
A valve that is opened or closed by the operator and typically used to isolate the feedwater to the boiler or the steam discharge from the boiler.
A watertube boiler with box heads connected together by straight, inclined water tubes.
A bank of tubes through which steam passes after leaving the boiler where additional heat is added to the steam.
The process of removing water from the boiler near the NOWL to control the quantity of impurities in the remaining water or to remove a film of impurities on the surface of the water.
The process where the water level in a boiler momentarily rises with an increase in steam demand.
A panel or an assembly of panels containing electrical switches, meters, busses, and other overcurrent protection devices (OCPDs).