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INCREASE RATE FIRE [8 records]

Record 1 2024-11-14

English

Subject field(s)
  • Fires and Explosions
  • Brush, Prairie and Forest Fires
DEF

A somewhat sudden, and sometimes unexpected, major increase in rate of spread and head fire intensity sufficient to upset overall fire suppression action or plans.

OBS

Blow-ups can result from small or large fire situations.

Key term(s)
  • blow up
  • blow up fire

French

Domaine(s)
  • Feux et explosions
  • Incendies de végétation
DEF

Augmentation forte, subite et parfois imprévue de la vitesse de propagation et de l'intensité d'un incendie, suffisante pour bouleverser les mesures ou les plans généraux de lutte.

Spanish

Save record 1

Record 2 2017-05-31

English

Subject field(s)
  • Closing Devices and Nozzles (Mechanical Components)
  • Taps and Plumbing Accessories
  • Fixed Rescue Facilities (fire)
CONT

One characteristic of a dry-pipe system is a delay in time between the opening of a sprinkler and the discharge of water, which may allow the fire to spread and more sprinklers to open. The delay is due to the time required to exhaust the air from the sprinkler piping. The difficulty may be partly overcome by installation of quick-opening devices which either increase the rate of discharge of air from the piping or accelerate opening of the dry valve when one or more sprinklers operate, depending upon the type of device used.

OBS

quick-opening device: term officially approved by the Lexicon Project Committee (New Brunswick).

French

Domaine(s)
  • Obturateurs et buses (Composants mécaniques)
  • Robinetterie et accessoires
  • Installations fixes de secours (incendies)
OBS

Accélérateur et exhausteur. Ces matériels ne sont utilisés que dans les postes à air et alternatifs. Ils ont pour objet d'accélérer l'évacuation de l'air, donc de diminuer le temps d'arrivée de l'eau aux sprinkleurs qui ont déclenché.

OBS

dispositif d'ouverture rapide : terme uniformisé par le Comité du projet de lexiques (Nouveau-Brunswick).

Spanish

Save record 2

Record 3 2017-05-31

English

Subject field(s)
  • Security Devices
  • Fire Detection
DEF

A fire detector that is activated by the rate of temperature increase in an area.

CONT

Rate-of-rise detectors usually combine two functioning elements, one to trigger the alarm on a rapid rise in temperature, the other on a slow rise.

OBS

rate-of-rise detector; rate-of-rise thermal detector: terms officially approved by the Lexicon Project Committee (New Brunswick).

French

Domaine(s)
  • Dispositifs de sécurité
  • Détection des incendies
CONT

Les détecteurs vélocimétriques sont actionnés par la vitesse d'élévation de la température, quelle que soit la température ambiante.

OBS

détecteur vélocimétrique; détecteur thermovélocimétrique : termes uniformisés par le Comité du projet de lexiques (Nouveau-Brunswick).

Spanish

Campo(s) temático(s)
  • Dispositivos de seguridad
  • Detección de incendios
Save record 3

Record 4 2012-02-20

English

Subject field(s)
  • Pre-Fire Planning
DEF

The relative activity of a fire in extending its horizontal dimensions... expressed either as [a] rate or increase of the fire perimeter, as a rate of increase in area, or as a rate of advance of its head, depending on the intended use of the information...

OBS

Recommended SI units are metres per minute (m/min) and kilometres per hour (km/h) (1.0 m/min is equivalent to 0.06 km/h).

OBS

"Rate of fire spread" has a broader meaning than "flame propagation rate" and "flame velocity (or speed)". They are often used interchangeably, however, because the latter terms serve as measuring indices for the spread of the fire.

Key term(s)
  • fire spreading rate

French

Domaine(s)
  • Prévision des incendies
DEF

Vitesse relative à laquelle un incendie accroît ses dimensions horizontales.

OBS

Elle peut s'exprimer en taux d'accroissement du périmètre total de l'incendie, en taux d'avance du front de l'incendie, ou en taux d'accroissement en superficie, selon l'usage auquel ces données sont destinées.

OBS

[Elle est] exprimée en distance par unité de temps (m/min ou km/h).

Spanish

Save record 4

Record 5 2011-11-17

English

Subject field(s)
  • Climatology
DEF

... a soil/duff drought index [developed by Keetch and Byram (1968]) that ranges from 0 (no drought) to 800 (extreme drought) and is based on soil capacity of 8 inches of water. Factors in the index are maximum daily temperature, daily precipitation, antecedent precipitation, and annual precipitation.

CONT

The Keetch Byram Drought Index(KBDI) provides a daily measure of soil dryness, which, in turn, gives an indication of water stress in plants. The KBDI represents the net effect of precipitation and evapotranspiration in producing cumulative moisture deficiency in deep duff or upper soil layers. The KBDI has a range from 0(no drought or soil moisture deficiency, i. e. soil at field capacity) to 2000(extreme drought, maximum soil moisture deficiency possible). The index can be viewed as the amount of rain needed to bring the soil back to saturation, with one mm of rain reducing the index by 10 points. The 0-2000 point scale is divided into three drought classes : 0-999=Low; 1000-1499=Moderate; 1500-2000=High. The KBDI is simple to calculate as it uses only two, daily weather observations-maximum temperature and 24-hour rainfall. The system functions in a book-keeping fashion where estimates of daily evapo-transpiration and measurements of precipitation increase or decrease the value of yesterdays index. The KBDI by itself is not a Fire Danger Rating System as it gives no indicate of the ease of ignition of the vegetation, or of the rate of fire spread, fire intensity and difficulty of control. It does however serve as a useful measure of drought occurrence.

CONT

Keetch-Byram Drought Index (KBDI): ... 0 - 200: Soil moisture and large class fuel moistures are high and do not contribute much to fire intensity. Typical of spring dormant season following winter precipitation. 200 - 400: Typical of late spring, early growing season. Lower litter and duff layers are drying and beginning to contribute to fire intensity. 400 - 600: Typical of late summer, early fall. Lower litter and duff layers actively contribute to fire intensity and will burn actively. 600 - 800: Often associated with more severe drought with increased wildfire occurrence. Intense, deep burning fires with significant downwind spotting can be expected. Live fuels can also be expected to burn actively at these levels.

CONT

... the Palmer Drought Index (PDI) and the Keetch-Byram Drought Index (KBDI) ... were [both] developed by John Keetch and George Byram, and originally were developed as aids for agriculture. The ... KBDI is used extensively in the eastern states and also in some parts of the west.

OBS

In the metric system the value of the index is usually assumed to range from 0 to 200 mm (even though 800 points actually corresponds to 204 mm).

OBS

Keetch-Byram Drought Index [is] a commonly-used drought index adapted for fire management applications ...

OBS

"Duff" is ... an important term in the fire weather program of the US Forest Service, used to describe the partially decayed organic matter on the forest floor which can become highly combustible during drought periods and contribute to the longevity and spread of forest fires. ... the Keetch-Byram Drought Index is sometimes referred to as the soil/duff drought index because it is a measure of how dry the soil and duff layers are.

French

Domaine(s)
  • Climatologie
OBS

On écrirait mieux «sècheresse».

OBS

sècheresse : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2006).

Key term(s)
  • indice de sècheresse Keetch-Byram

Spanish

Save record 5

Record 6 2005-03-09

English

Subject field(s)
  • Brush, Prairie and Forest Fires
DEF

... the rapid advance of a wildfire characterized by a marked increase in rate of spread and a corresponding increase in frontal fire intensity with respect to that noted before and following the event.

French

Domaine(s)
  • Incendies de végétation
DEF

Avance rapide d'un incendie, caractérisée par une augmentation marquée de la vitesse de propagation et de l'intensité du front par rapport à ces caractéristiques avant et après l'événement.

Spanish

Save record 6

Record 7 2001-05-01

English

Subject field(s)
  • Silviculture
  • Forestry Operations
DEF

A hand method of removing the upward-extending branches from tops of felled trees to keep slash low to the ground, to increase rate of decomposition, lower fire hazard, or as a pretreatment prior to burning.

Key term(s)
  • lopping and scattering
  • lopping-and-scattering

French

Domaine(s)
  • Sylviculture
  • Exploitation forestière
DEF

[...] action de réduire en menus morceaux sur une coupe les branches, rameaux et tiges inutilisables [...] suivie d'une dissémination sur le sol des rémanents qui en résultent [...]

Spanish

Save record 7

Record 8 1992-10-01

English

Subject field(s)
  • Weapon Systems

French

Domaine(s)
  • Systèmes d'armes

Spanish

Save record 8

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