VACUUM LEAK DETECTOR
VLR ..
and
VLR .. MV
20/05/2020
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7.3 Functional
Check
The functional and operational safety check must be performed:
o
After each commissioning process
o
According to the time intervals given in Section 7.2
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o
Each time a malfunction has been corrected
Two persons may be required to perform a functional check, depend-
ing on the length of pipeline and how it is laid. The following aspects
must be observed or carried out:
o
Coordinate the work to be performed with those responsible for
operation
o
Observe the safety instructions for working with the product to be
conveyed
o
Check the condensate traps and empty if necessary (7.3.1)
o
Check the free passage of air in the interstitial space (7.3.2)
o
Test the switching values with the interstitial space (7.3.3)
Test the switching values with the testing device (7.3.4)
o
Test the pump delivery pressure (7.3.5)
o
Perform a system tightness test (7.3.6)
o
Check the excess pressure alarm (only for version with solenoid
valve) (7.3.7)
o
Check the additional pressure switch in conjunction with VLR ..
(version with solenoid valve) (7.3.8)
o
Check the probe (if used) (7.3.9)
o
Create the operating condition (7.3.10)
o
A test report must be completed, confirming functional and opera-
tional safety. Test reports are available for download from the SGB
website
7.3.1 Checking free passage of air 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.
(1) Attach the measuring gauge to the connection on three-way
valve 21 and turn the valve 180°.
(2) Open the test valve at the end opposite the leak detector; if there
are multiple pipe interstitial spaces, the test valves must be
opened sequentially at the end opposite the leak detector.
(3) Check if the measuring gauge registers a vacuum drop. If no
pressure drop occurs, locate and correct the cause.
(4) Return the three-way valves to the operating position and remove
the measuring gauge.
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For Germany: In addition, national laws apply (e.g., AwSV)
Functional Check and Maintenance
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