AIR/GAS PRESSURE - LIQUID SYSTEM - TANK GAUGING

QUESTION OVER PRESSURE
LEAK DETECTOR

VACUUM
LEAK DETECTOR
OPEN
SYSTEM
Is the product kept in the
inner tank in case of a leak
in the inner tank?
YES
Air / gas enters produkt
NO
product enters interstitial
space
NO
product enters interstitial space
Is the integraty of the outer tank monitored permanently? YES YES NO
Is the environmental
protection realised with a
leakage in the outer tank?
YES
air escapes from the
intestitial space into the
environment.
YES
air or ground water enters
the interstitial space.
NO
if the outer skin is already untight, when a leak in the inner skin occurs.
If NO, are you able to allow for the risks and does your insurance policy cover for environmental decontamination costs?
Can testing be done without
access of the tank?

YES
by bleeding air/gas out of
the system directly at the
leak-detector.
YES
by ventilating the system
directly at the leak detector.
NO
Environmental impact on
decommissioning or
recommissioning after a leak
ZERO LOW MODERATE TO HIGH
Environmental impact on decommissioning? LOW
dispoal of hardware
HIGH
big waste disposal efforts
are required for the leak-
detection-liquid, by an
expert contractor
MEDIUM
P.C.B. disposal
System failure risks NONE
YES
in case the liquid gels (stagnates) in the interstitial space (for example by topping
up with incompatible liquid)
leak detection no longer
functions.
High cost for tank replacement
YES
product loss must
be high to activate alarm.
High costs for environmental
decontamination.