Long, high swells which have increased in height, almost to the breaking point, as they pass over shoals or run in shoaling water.



Related Terms

FIRST-ORDER LEVELING

Spirit leveling of high precision and accuracy in which lines are run first forward to the objective point and then backward to the starting point.

BUNKER C OIL

Residual fuel oil (no. 6 fuel oil) of high viscosity commonly used in marine and stationary steam power plants.

SPONTANEOUS COMBUSTION

Ignition of combustible material following slow oxidation without the application of high temperature from an external source.

HEAT RELEASE

The total quantity of thermal energy above a fixed datum introduced into a furnace by the fuel, considered to be the product of the hourly fuel rate and its high heating value, expressed in Btu per hour per cubic foot of furnace volume or square foot of heating surface.

MIXER

The part of a pre-mix burner (also gas-air mixer) which uses the kinetic energy of the high velocity fuel gas stream to draw in part or all of the air required by the burner for combustion.

OPERATING CONTROL

A control to start and stop the burner; it must be set below the high limit control.

FOAMING

Formation of steam bubbles on the surface of boiler water due to high surface tension of the water. See carryover.

THERMAL NOx

NOx formed via the Zeldovich mechanism. The rate-limiting step in this mechanism is the formation of the O radical. This occurs only at high temperatures (above about 2400o F.). Hence the term thermal NOx, since it is NOX produced in the highest temperature regions of the flame.

TURBULENT FLOW

In turbulent flow vortices, eddies and wakes make the flow unpredictable. Turbulent flow happens in general at high flow rates and with larger pipes. 4000 < Re (Reynolds number)

ATOMIZATION

The process whereby a volume of liquid is converted into a multiplicity of small drops. The principal goal is to produce a high surface area to mass ratio so that the liquid will vaporize quickly and thus be susceptible to combustion.

Related questions

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