28/07/2020
VACUUM-LEAK DETECTOR
VLXE .. Ex M and VLXE .. Ex MMV
- 43 -
12.2 Appendix W, Warmed Tanks (Heated Tanks)
12.2.1 Heated tanks (> 50°C
≤
200°C)
(1) It is assumed that the temperature increase from before filling to
after filling the tank is not more than 25 K.
If there are major temperature differences Section 12.3.2 must
also be observed.
(2) The design of the leak detector for use on a heated tank is es-
sential due to the temperature resistance and/or suitability of the
components used.
For this reason, both the cooling line (cooling the intake air-
vapors mixtures) and the probe in conjunction with the solenoid
valve (retention of the hot liquid) are used.
(3) When commissioning a tank like this, special attention should be
paid to the leak detector, especially during the heating phase, as
this can result in strong pressure changes.
When using the VLXE .. Ex MMV, the following points must be ob-
served or checked:
a) Check whether special switching values as per 12.3.2 are re-
quired.
b) Only metallic pipes should be used as the connection line between
the leak detector and the tank.
c) The leak detector including the solenoid valve(s) must be installed
so that the ambient temperature does not exceed 55°C (e.g., radi-
ant heat of the tank).
d) The process temperature for the sensor can be up to 200°C; the
ambient temperature must not exceed 70°C (clarification with SGB
GmbH on a case-by-case basis).
e) If the sensor used is approved as overfill protection its testing is
based on this approval. Other sensors must be checked in the an-
nual functional check, by removing them if necessary (e.g., float
switch, where the mobility needs to be checked).
f) The vacuum build-up should be executed using an external vacu-
um pump.
g) If no pressures of more than 5 bar can occur in the tank interstitial
space, it is enough to install a solenoid valve in the suction line.
12.2.2 Tanks that need to be filled hot (
T > 25°C)
Calculation of the (possibly) required special switching valuesin coor-
dination with SGB GmbH. Special switching values are intended to
ensure that the alarm is triggered and that false alarms cannot occur.
It is important that the temperature differences are noted, as well as
the speed of the temperature change in the interstitial space.
Appendix
Summary of Contents for VLXE Ex M Series
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