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4.1.8.2.(4)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F22-OS1.1]
Application
Application 1: 
Installation of fill pipes for the transfer of Class I liquids into storage tanks from the top of the tank, in buildings, structures and open areas.
Exceptions: 
except:
  • as exempted in Sentences 4.1.1.1.(2) and (3), which apply to unique hazards in process plants, transportation, oil burning equipment, farms, isolated construction projects, and aerosol products,
  • when the conditions in the vapour space are such that they reduce the probability of the risk of ignition of flammable vapours, as provided in Clause 4.1.8.2.(3)(a), and
  • when the liquid being transferred has a minimum conductivity that reduces the probability of the accumulation of static electricity, as provided in Clause 4.1.8.2.(3)(b).
Application 2: 
This also applies to the loading and unloading of tank vehicles, as required in Sentence 4.11.3.3.(1).
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Intent
Intent 1: 
To limit the probability that vibrations due to inadequate support will lead to the breakage or failure of the fill pipe, which could lead to the 150 mm maximum clearance of the fill pipe from the bottom of the tank being exceeded, which could lead to free-fall or splashing of the liquid as it enters the tank, which could lead to the buildup of static charges, which could lead to the ignition of vapour, which could lead to harm to persons.
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