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4.3.7.2.(1)
ApplicationIntent
OS1OS1OS1OP1OP1OH5OP1OH5
ObjectiveOP1 Fire Protection of the Building or Facility
Attribution
(a) [F20-OP1.1] Applies to the base and walls of secondary containments being designed, constructed and maintained to withstand full hydrostatic head.
Application
Application 1: 
Design, construction and maintenance of bases and walls of secondary spill containments for aboveground storage tanks--and portable tanks that have a capacity greater than 2 500 L [as stated in Sentence 4.2.1.1.(3)]--for flammable liquids and combustible liquids, in buildings, structures and open areas.
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
  • as stated in Sentence 4.10.1.1.(2) and provided in Subsection 4.10.3., which apply to distilled beverage alcohol at distilleries.
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Intent
Intent 1: 
To limit the probability that the inability of the secondary containment to resist the hydrostatic load of the liquid it holds will lead to failure of the secondary containment, which could lead to the escape and spread of liquid outside of the secondary containment, which could lead to the ignition of vapour from a nearby ignition source, which could lead to damage to the building or facility.
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