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4.5.6.6.(1)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F43-OS1.1]
Application
Application 1: 
Piping for flammable liquids or combustible liquids, in service tunnels used for pedestrian traffic other than maintenance personnel.
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, and
  • Sentence 4.5.1.1.(2), which applies to:
    • tubing or casings and piping for oil or gas wells,
    • transmission pipelines,
    • piping for vehicles, aircraft, watercraft and portable or stationary engines,
    • piping systems in distilleries, and
    • piping within the scope of the applicable provincial codes regulating boilers and pressure vessels.
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Intent
Intent 1: 
To limit the probability of the escape of liquid in a service tunnel that is used for pedestrian traffic, which could lead to the ignition of vapour from a nearby ignition source, which could lead to harm to persons in the tunnel.
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