To limit the probability that piping defects or damage will go unnoticed, which could lead to appropriate measures not being taken, which could lead to the escape and spread of liquid, which could lead to the accumulation and subsequent ignition of vapour from a nearby ignition source, which could lead to damage to the building or facility.
To limit the probability that ground heave or foundation settling caused by the freeze/thaw cycle will lead to failure of the piping, which could lead to the escape of liquid, which could lead to the accumulation and subsequent ignition of vapour from a nearby ignition source, which could lead to damage to the building or facility.
To supersede the requirements of Sentence 4.5.6.5.(2) and permit underground piping to be located near building foundations where it enters a building.