To limit the probability that defects or damage in piping systems 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 harm to persons.
To limit the probability that premature corrosion will lead to failure of the piping, 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.