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4.3.10.3.(4) | Application | Intent |
| OS1 | OS1 | OH5 | OH5 |
| Objective | OS1 Fire Safety |
| Attribution | |
| Application | Application 1: Entry location of normal vent piping equipped with
a vent alarm, for underground storage tanks for flammable liquids or combustible
liquids.
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 remove the limitation on the extension of the vent piping
into the tank [as stated in the beginning of Sentence 4.3.10.3.(4)] and
permit vent piping to extend beyond this limitation if the vent is equipped
with a vent alarm that will alert trained personnel of any vent obstruction.
This is to limit the probability that blocking or obstruction of
the vent pipe by liquid will lead to overpressurization or back pressure,
which could lead to failure of the tank and the escape of liquid--or blowback
of liquid or vapour at the fill opening--which could lead to the ignition
of vapour from a nearby ignition source, which could lead to harm to persons.
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