Professional engineering organization that develops and maintains boiler and pressure vessel codes, standards, and safety regulations for the design, construction, and operation of boilers and pressure vessels in the United States.

The process of breaking liquid fuel into fine droplets to create a combustible fuel-air mixture for efficient burning in boiler burners. Proper atomization is critical for complete combustion and optimal efficiency.

The controlled removal of boiler water containing concentrated dissolved solids to maintain proper water chemistry and prevent scale formation. Essential for maintaining boiler efficiency and preventing damage.

The percentage of fuel energy that is successfully transferred to the boiler water/steam, calculated by measuring stack temperature, oxygen content, and fuel composition. Primary indicator of boiler performance.

A device that removes dissolved oxygen and other non-condensable gases from boiler feedwater using steam heating and mechanical methods, preventing corrosion in the feedwater system and boiler.

A heat recovery device that preheats boiler feedwater using waste heat from flue gases, improving overall boiler efficiency by capturing heat that would otherwise be lost up the stack.

A boiler design where hot combustion gases pass through tubes surrounded by water. Common in commercial and small industrial applications up to approximately 800 horsepower due to compact design and lower cost.

A visual water level indicator showing the actual water level inside the boiler steam drum. Critical safety device required by ASME code for monitoring and maintaining proper water levels during operation.

A unit of boiler capacity measurement where 1 boiler horsepower equals 33,475 BTU/hr of heat output, equivalent to evaporating 34.5 lbs/hr of water at 212°F. Standard industry measure for boiler sizing and capacity rating.

An automatic safety device that shuts down the boiler burner when water level drops below a safe minimum, preventing dangerous dry firing and potential boiler explosion. Required by ASME code on all steam boilers.

A control system that continuously adjusts boiler firing rate to match steam demand, providing smooth load following and improved efficiency compared to on/off operation. Maintains consistent pressure and reduces cycling losses.

An automatic combustion control system that continuously monitors flue gas oxygen content and adjusts combustion air to maintain optimal air/fuel ratios, maximizing efficiency while ensuring safe combustion conditions.

A spring-loaded safety valve that automatically releases steam when boiler pressure exceeds the maximum allowable working pressure (MAWP), preventing dangerous overpressure conditions and potential vessel failure.

A horizontal fire-tube boiler design featuring a large cylindrical furnace surrounded by water, with fire tubes carrying combustion gases through the water space. Most common industrial fire-tube design for medium capacity applications.

An automatic valve that removes condensate, air, and other non-condensable gases from steam systems while preventing live steam loss. Essential for maintaining system efficiency and preventing water hammer.

The ratio of useful heat output to total heat input, expressed as a percentage. Includes all heat losses including stack, radiation, convection, and blowdown losses. More comprehensive than combustion efficiency alone.

An electronic device that controls motor speed by varying the frequency and voltage of electrical power supplied to AC motors. Provides significant energy savings on variable load applications like fans and pumps.

A boiler design where water circulates through tubes heated externally by combustion gases. Used for high-pressure, high-capacity applications where fire-tube designs reach practical limits of size and pressure.