4.5.10.7.(6)

Objective

OS1 Fire Safety

Attribution

Intent

Intent 1:

To exempt maintenance operations on pressurized systems from the application of Sentence 4.5.10.7.(1) if certain practices are carried out.

This is to limit the probability that:

  • the piping systems will leak during maintenance operations, 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, and
  • the maintenance operations will lead to the ignition of vapour from the piping system, which could lead to a fire or explosion, which could lead to harm to persons.

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