To limit the probability that defects in storage tanks or piping systems or the escape of liquid will go unnoticed, which could lead to appropriate measures not being taken, which could lead to the 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 the use of leakage testing equipment will lead to the creation of ignition sources, which could lead to a fire or explosion, which could lead to damage to the building or facility.