Mounting and commissioning
20
LAG-14 ER
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6.2
Installing the container for the leak detection fluid
Verify the volume of leak detection fluid required (check the
nameplate at the tank (container)) and determine the number of
required black LAG containers as described in chapter 6.1,
page 17).
The black LAG container can be mounted directly next to the control
unit or in the vicinity of the container (tank) to be monitored in haz-
ardous areas (Ex) zone 1 and zone 2 (e.g. in the manhole).
When installing the LAG container in the hazardous area (Ex),
in the manhole or outdoors, make sure neither surface water no
rain nor dirt nor airborne sand can get into the container or into
the cable junction box.
Mount the black LAG container high enough above the intersti-
tial space for the static pressure of the leak detection fluid to be
sufficient at all points of the interstitial space to cause the leak
detection fluid to escape and the leak detection fluid level in the
black LAG container to fall in the case of a leak so that an alarm
can be triggered.
The minimum distance between the tank top and the bottom of
the black LAG container primarily depends on the density of the
stored medium and, in the case of underground tanks, on the
possible level of the ground water or backflow above the tank
top. Mount the black LAG container at least 30 cm above the
tank top.
If the test pressure for the interstitial space of the tank is 0.6 bar,
the black LAG containers (with reference to the liquid level
screw) may be no higher than 5.5 m above the bottom of the
tank.