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5.6.1.13.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Draining of tanks, piping and machinery reservoirs containing combustible liquids or flammable liquids, or that are likely to contain flammable vapours, in buildings or parts of buildings undergoing demolition, including any incomplete or abandoned buildings.
Application 2: 
Removal of tanks, piping and machinery reservoirs containing combustible liquids or flammable liquids, or that are likely to contain flammable vapours, and that have been drained and purged, in buildings or parts of buildings undergoing demolition, including any incomplete or abandoned buildings.
Exceptions: 
except as provided in:
  • Sentence 5.6.1.13.(2), which applies where removal of the equipment is impracticable, and
  • Sentence 5.6.1.1.(2), which applies to construction or demolition activities involving buildings that:
    • do not pose an exposure hazard to other buildings, or
    • pose a minimal fire hazard to occupants.
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Intent
Intent 1: 
For the draining operation, to limit the probability of the unwanted escape of liquids or vapours during demolition operations, which could lead to the ignition of flammable vapours, which could lead to a fire or explosion, which could lead to harm to persons.
Intent 2: 
For the removal operation, to limit the probability of the ignition of flammable vapours during demolition operations, which could lead to a fire or explosion, which could lead to harm to persons.
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