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4.3.7.5.(1)
ApplicationIntent
OS1OS1OS1OP1OP1OH5OS3
ObjectiveOS3 Safety in Use
Attribution
(b) [F10-OS3.4]
Application
Application 1: 
Egress from secondary containment spaces used for aboveground storage tanks [and their valves and ancillary equipment]--and for portable tanks that have a capacity greater than 2 500 L [as stated in Sentence 4.2.1.1.(3)]--for flammable liquids andcombustible 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 restricting egress of emergency responders from the contained space in the event of the escape of liquid from the tank into the secondary containment area, which could lead to harm to persons.
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