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4.3.7.5.(1)
ApplicationIntent
OS1OS1OS1OP1OP1OH5OS3
ObjectiveOS1 Fire Safety
Attribution
(a) [F82-OS1.1] [F12-OS1.2]
Application
Application 1: 
Access to aboveground storage tanks [and their valves and ancillary equipment]--and to 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 located in secondary containment spaces, 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 of restricted access to tanks, valves and ancillary equipment in the containment space by employees for normal operation, maintenance or inspection, which could lead to defects or liquid escape going unnoticed, which could lead to the ignition of vapour from a nearby ignition source, which could lead to harm to persons.
Intent 2: 
To limit the probability of restricted access to tanks, valves and ancillary equipment in the containment space by emergency responders, which could lead to delays or impediment of their operations, which could lead to the spread of fire beyond the point of fire origin, which could lead to harm to persons.
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