4.10.3.2.(2)

Objective

OS1 Fire Safety

Attribution

[F02-OS1.2]Applies to supports having less than a 2 h fire-resistance rating being protected by an automatic fire suppression system.

Intent

Intent 1:

To exempt supports having less than a 2 h fire-resistance rating from the application of Sentence 4.3.3.1.(3), which would otherwise require a minimum 2 h fire-resistance rating, if certain measures are taken [the supports are protected by an automatic fire suppression system].

This is to limit the probability that a fire will not be suppressed or controlled, which could lead to the spread of the fire, which could lead to an exposure of the supports to the fire, which could lead to the premature failure [collapse] of the supports, which could lead to the collapse of the tank, which could lead to the escape of liquid, which could lead to the ignition of vapour from a nearby ignition source, which could lead to harm to persons.

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