31/10/2019
VACUUM LEAK DETECTOR
VLXE ..
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12. Appendix
12.1 Use on interstitial spaces that are filled with leak detection liquid
12.1.1 Prerequisites
(1) The only leak detectors that may be used are those with suitable
alarm pressures depending on the vessel diameter and the den-
sity of the stored goods.
(2) The approach described below is for cylindrical vessels lying hor-
izontally (e.g. DIN 6608 or EN 12285-1).
(3) If this procedure is performed on other vessels, in individual cas-
es the consent of the local authorities responsible is required.
12.1.2 Preparation
(1) Dismantle liquid-based leak detector.
(2) Suck leak detection fluid from the interstitial space. As follows:
- Connect the suction line connection of the installation pump to
a vessel nozzle via an intermediate vessel
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.
- Suck until there is no more liquid to be sucked.
- Finish fitting a (large) shut-off cock (at least ½”) on the other
nozzle and shut-off cock.
- Pump off liquid until no new liquid appears in the intermediate
vessel.
- Suddenly open shut-off cock (with pump running); this brings an-
other rush of liquid into the intermediate vessel.
- Continue procedure, opening and closing the test cock, until no
more liquid enters the intermediate vessel when either opening or
closing.
12.1.3 Installation and start-up of the leak detector
(1) By sucking away the leak detection fluid, an air cushion is creat-
ed above the leak detection fluid.
(2) Install leak detector as indicated by the documentation and take
into operation.
(3) Perform functional check of the leak detector.
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The liquid to be sucked is collected in this vessel.
Appendix