Class IV

Systems of this class will detect, to specific levels of propability, specified rates of change of tank contents (i.e. leakages into or out of the tank). A strong possibility exists that product will enter the environment in the event of a leak.

Klasse 4

IV a

Dynamic leak detection systems will by reconciliation also indicate leaks in the connected pipework.

IV b

Static tank gauge leak detection systems or statistical quiet period leak detection systems will only indicate leaks from a tank.