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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.

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# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
There are currently 19 names in this directory beginning with the letter D.
damper
An adjustable blade or set of blades used to control the flow of air.
data plate
A plate that is attached to a piece of equipment that provides important information about that equipment.
deaerator
A deaerator feedwater heater operating under pressure used to separate oxygen and other gasses from the steam before releasing the gasses to the atmosphere through a vent.
dealkalizer
An ion-exchange water conditioner that removes alkalinity from water.
demineralizer
An ion-exchange conditioner consisting of a strong cation-exchange resin and a strong anion-exchange resin that purifies water more than is possible with a zeolite softener.
desuperheater
An accessory used to remove heat from superheated steam to make it suitable for a process.
diaphragm draft gauge
A draft gauge that measures draft using a flexible diaphragm connected with linkage to a pointer on a scale that is calibrated in inches or fractions of an inch of water column.
diffuser
See register.
digester gas
Gas produced by the biological breakdown of organic matter in the absence of oxygen.
digital control system
An integrated system of control loops that use digital control signals to control a process
displacer
A level-measuring instrument consisting of a cylinder, heavier than the liquid in which it is immersed, connected to a spring or torsion device that measures its weight. Also known as a pneumatic level control.
draft
The flow of air or gasses of combustion caused by a difference in pressure between two points.
draft gauge
A pressure gauge used to measure the difference in draft pressure between the atmosphere and the furnace, breeching, or stack.
drum desuperheater
A desuperheater that routes steam back through coils of submerged piping within the steam drum.
drum internal
See steam separator.
dry lay-up
The storage of a boiler with all water drained.
dry pipe separator
A closed-end pipe, perforated at the top, with drain holes on the bottom to remove moisture from steam.
dry-back boiler
A firetube boiler with a refractory­ lined rear door that directs the gasses of combustion from the furnace to the second-pass tubes and then through succeeding passes if so designed.
dry-top boiler
A vertical firetube boiler in which the upper tube sheet is dry.
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