GOK LAG 2000 A Instructions De Montage Et D'utilisation page 38

Scenario 2: Underground tanks with at least 30cm earth coverage
The usable volume of an LDL tank must be at least 1L per 100L leak detector liquid in the
monitoring space.
One LDL tank is sufficient for 450L monitoring volume. That corresponds to tanks with a
storage volume of up to 60.000L.
The number of additional LDL tanks can be determined from the volume of the leak detector
liquid in the monitoring space shown in Table 3.
Table 3:
Volume of leak detector liquid
according to type label on the
tank
0 to 450 Litres
451 to 900 Litres
901 to 1350 Litres
1351 to 1800 Litres
1801 to 2250 Litres
4)
In Germany, underground tanks only within the scope of replacing leak detectors.
Connection line
• The connection line Is the inlet of the leak detector system.
• If possible, the inlet and outlet must be attached to the end points of the leak detector
system to ensure an adequate flow of leak detector liquid.
• Do not use any pipes or fittings that are zinc-plated on the inside, as zinc reacts with the
leak detector liquid.
• Pipes and fittings must be protected against corrosion on the outside.
• The inside diameter of the connection line must be ≥ 13mm.
• Do not install any constrictions or shut-off fittings in the connection line. Constrictions are
possible at the connections.
• With copper pipes, an isolation part must be installed to prevent contact corrosion.
• Hoses may only be used where LDL tanks are installed on the domes of underground tanks,
or as a short visual section in the connection line.
• The connection line must not be the sole support for the LDL tank.
• The connection line must rise continuously from the fuel tank to the LDL tank.
For connection lines in potentially explosive atmospheres, according to
EN 131260-3, electrical surface resistance must be < 1 x 10
This requirement does not apply to the LAG 2000 A if the outer diameter of the
connection line is ≤ 20mm.
Check valve of the monitoring space
• The check valve is the outlet of the leak detector system.
• To check the function of the leak detector , the leak detector liquid is drained via a check
valve.
• The check valve must be dimensioned for a flow of > 0.5L/min. leak detector liquid,
e.g. 1/2" ball valve.
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Number of required
with sensor unit
LDL tank – monitoring space
Leak detector type LAG 2000 A
LDL tanks
1
of the fuel tank
4)
Number of required
additional LDL tanks
without sensor unit
0
1
2
3
4
9
Ω.