SGB VLR 230, Документация, Страница: 37 / 45

TÜV Nord
Statement
on the use of type VLR vacuum leak detectors
The VLR vacuum leak detector approved for connection to double walled pipes is
now also to be used for the monitoring of double walled hoses by “System Klenk”
designated “DWSL”. The suitability of the structural design of the interstitial space of
the double walled pipe as part of a vacuum-operated leak detector was tested during
approval procedure, Approval No. Z-65.25-220. The test evaluations involved
defining the parameters for the leak detectors in use. The interstital space of the
double walled hose may have vacuum leak detectors connected, which produce
vacuums of up to 500 mbar and which trigger an alarm at or before a vacuum of 325
mbar. The conveying pressure in the double walled hose can be up to 16 bar, which
means that the leak detectors in use must also be overpressure-proof up to 16 bar
and/or protected against unacceptable overpressure.
The test on the manufacturer’s data for the VLR vacuum leak detector confirmed that
this leak detector satisfies the requirements for monitoring type VLR.. /R double
walled hoses by Klenk, where the designation E indicates use of the devices with
interconnected solenoid valve. The alarm switching pressures are to be selected in
accordance with the aforementioned vacuum pressure value of
≥ 325 mbar. The Test
Inspectorate has no reservations regarding expanding the operative range of type
VLR../E leak detector which has been approved by the building authorities to include
the double walled hoses by Klenk. For installation, compliance is required with the
manufacturer’s instructions, specifically relating to the distances between conduit and
junction of the measuring and suction lines (node point) and observing the
requirement to install a pressure equalizing vessel in the measuring line for creating
an additional volume.
[Signed & Stamped]
Straube
Expert
TÜV Nord GmbH
Test Inspectorate for Leak Detection Devices