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4.3.11.3.(5)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Location of filling connections for underground storage tanks for flammable liquids and combustible liquids where:
  • there is a process or activity located indoors and to which the tank is directly associated, or for the collection of used liquids, and
  • the fill piping is provided with means to prevent flammable vapours from returning to the building.
Exceptions: 
Exceptions: 
except as exempted in Sentences 4.1.1.1.(2) and (3), which apply to unique hazards at process plants, in transportation, for oil burning equipment, on farms and isolated construction projects, and the storage of aerosol products.
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Intent
Intent 1: 
To remove the requirement in Sentence 4.3.11.3.(3) for filling connections to be located outdoors if:
  • certain conditions exist [the tank is directly associated to a process or activity located indoors, or is used for the collection of used liquids], and
  • measures are taken to minimize the accumulation of vapour inside the building.
This is to limit the probability of the ignition of vapour from a nearby ignition source inside the building, which could lead to harm to persons inside the building.
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