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4.3.12.5.(1)
OP1OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Minimum fire-resistance ratings of fire separations forming fire compartments separating indoor storage tanks for flammable liquids and combustible liquids in industrial occupancies from the remainder of the building, and where:
  • quantities are greater than are permitted for incidental use in Subsection 4.2.8. [specifically Sentence 4.2.8.2.(2)],
  • the tanks are required for special process operations,
  • total quantities per fire compartment are not more than one-half the quantities permitted in Table 4.3.12.4.,
  • the tanks are located on the first storey, and
  • the tanks are located outside of a storage room required in Sentence 4.3.12.4.(1).
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 limit the probability that a fire involving tanks will spread outside of the area of fire origin, which could lead to harm to persons in other parts of the building.
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