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INSTANTANEOUS POINT SOURCE [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 1989-07-31

English

Subject field(s)
  • Fires and Explosions
  • Occupational Health and Safety
CONT

To estimate the vapour concentrations downwind of an accident site for determination of the flammability or toxicity hazard zone, the atmospheric dispersion of a contaminant vapour is modelled as a "puff" or "plume" according to the decision tree given in Figure 3. A gas leak form a tank is considered a semi-continuous point source, modelling as a plume, whereas the release of a large amount of gas over a very short time period of the order of seconds to minutes is considered an instantaneous point source modelled as a puff.

French

Domaine(s)
  • Feux et explosions
  • Santé et sécurité au travail

Spanish

Save record 1

Record 2 1989-03-31

English

Subject field(s)
  • Air Pollution
  • Environmental Studies and Analyses
OBS

In an accidental situation,... the mode of release depends on the chemical and how it is stored and on the nature of the rupture which may be highly irregular and can occur anywhere on the containing vessel.... A gas leak from a tank would act as a "point" source of vapour emissions, whereas as a liquid leak spreading on a land or water surface and evaporating would act as an "area" source. Both of these types of sources would be of a "semi-continuous" nature, whereas a catastrophic failure would result in an "instantaneous" cloud(or "puff") source.... in this latter case, a large amount of material is released in a short time....

French

Domaine(s)
  • Pollution de l'air
  • Études et analyses environnementales
OBS

Dans les cahiers de la collection "Enviroguide", publiés par Environnement Canada, se rapporte à la perforation d'une citerne par suite d'un accident, donnant lieu sur le coup à une très forte émission de vapeurs qualifiée de "bouffée" (voir cette fiche).

Spanish

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Record 3 1989-03-31

English

Subject field(s)
  • Air Pollution
  • Environmental Studies and Analyses
CONT

This type of motion causes a smoke plume from a continuous point source to meander ....

OBS

... accidental situation.... The mode of release depends on the chemical and how it is stored and on the nature of the rupture... on the containing vessel.... A gas leak from a tank would act as a "point" source of vapour emissions, whereas as a liquid leak spreading on a land or water surface and evaporating would act as an "area" source. Both of these types of sources would be of a "semi-continuous" nature, whereas a catastrophic failure... would result in an "instantaneous" cloud(or "puff") source.... [in] the latter case,... a large amount of material is released in a short time.

French

Domaine(s)
  • Pollution de l'air
  • Études et analyses environnementales
OBS

Modélisation de la diffusion atmosphérique des polluants.

Spanish

Save record 3

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