seven short sound signals followed by a long sound signal.



Related Terms

DBA

'A' weighted average of the sound pressure levels over the entire frequency band. Intended to be a more accurate representation of how a human hears sound.

DECIBEL

Unit of sound pressure or power. Abbreviation is 'dB'. 1 Watt of sound power is equal to 120 dB.

FLASHBACK

A phenomenon occurring only in pre-mix gas burners when the flame speed overcomes the gas-air mixture flow velocity exiting the gas tip. The flame rushes back to the gas orifice and can make an explosive sound when flashback occurs. Flashback is most common when hydrogen is present in fuel gas.

THERMO ACOUSTICAL EFFICIENCY

Equal to the sound power level/heat release. A value used to characterize the amount of combustion noise emitted from a flame. Defined as the ratio of the acoustical power emitted from the flame to the total heat release of the flame. Approximately equal to 1 X 10-6 for premixed and turbulent flames and equal to 1 X 10-9 for diffusion and laminar flames.

BLAST

A sound signal made with the whistle of the vessel

GENERAL EMERGENCY ALARM

A sound signal of seven short blasts and one long blast given with the vessel ́s sound system

ACOUSTIC

A term pertaining to sound, or the science of sound.

AIRBORNE SOUND

Sound which reaches the point of interest by radiation through the air.

AMBIENT NOISE

The normal sound in a room or other location.

AUDIBLE SOUND

Vibrations in a gas, liquid, or solid with components falling in the frequency range of 16Hz to 20Hz.

Related questions

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