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4.5.5.4.(1)
ApplicationIntent
OP1OS1OH5
ObjectiveOH5 Hazardous Substances Containment
Attribution
[F04-OH5]
Application
Application 1: 
Alloy steel bolting materials for flanged connections in steel piping systems for flammable liquids or combustible liquids, in buildings, structures and open areas.
Application 2: 
This also applies to:
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 fuel dispensing stations and distilleries, and
    • piping within the scope of the applicable provincial boiler and pressure vessel codes.
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Intent
Intent 1: 
To limit the probability that bolting materials will fail when exposed to fire, which could lead to the failure of the piping connection, which could lead to the spread of liquid, which could lead to harm to the public.
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