SGB VLXE Ex M Series, Documentation, Page: 35 / 56

28/07/2020
VACUUM-LEAK DETECTOR VLXE .. Ex M and VLXE .. Ex MMV - 35 -
7.3 Functional check
The functional and operational safety tests must be performed:
o
after each commissioning
o
according to the time intervals given in Chap. 7.2 10
o
each time a malfunction has been corrected
Two persons may be required to perform a functional check, depend-
ing on the type of pipeline or tank. The following contents must be
observed or met:
- Coordinate the work to be performed with those responsible for
operation.
- Observe the safety instructions for working with the product to be
stored or conveyed.
- Checking and if necessary, emptying the condensate traps (7.3.1).
- Continuity test of the interstitial space, (7.3.2)
- Testing the switching values with the interstitial space (7.3.3) or
testing the switching values with testing equipment (7.3.4)
- Testing the pump delivery pressure (7.3.5)
- System tightness test (7.3.6)
- Checking the overpressure alarm (only for version
VLXE .. Ex MMV) (7.3.7)
- Checking the additional pressure switch in conjunction with
VLXE .. Ex MMV (7.3.8)
- Testing of the probe (only VLXE .. Ex MMV LS) (7.3.9)
- Creating the operating condition (7.3.10)
- A test report must be completed, confirming functional and opera-
tional safety. (Test reports are available for download for the SGB
website)
7.3.1 Checking and emptying the condensate traps, if required
CAUTION: The condensate traps may contain the stored/conveyed
product. Take appropriate protective measures.
(1) Close any shut-off cocks on the interstitial space side.
(2) Turn three-way valves 180° to ventilate the connection lines.
(3) Open and empty the condensate traps.
(4) Close the condensate traps.
(5) Three-way valves back to the operating position.
(6) Reopen the valves closed in No. (1).
7.3.2 Checking free passage in the interstitial space
Checking the free passage of air ensures that an interstitial space is
connected to the leak detector and that it has sufficient passage to
cause an air leak to trigger an alarm.
10
For Germany: In addition, national laws apply (e.g., AwSV)
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Functional Check and Maintenance