24/10/2018
PRESSURE LEAK DETECTOR
DLR-G ..
- 13 -
3.4.5 Interaction between interstitial space, leak detection medium and operating mode
The following statements apply only to applications to transport
liquids with flash points
≤ 60°C (for Germany ≤ 55°C acc. to TRGS
509 and 751). They are based on a risk evaluation according to the
directive 94/9/EEC (explosion directive). The risk evaluation was per-
formed based on the table in section 3.3 (informative) for EN 13160.
If the evaluation of the device categories has different results due to
operational regulations or for any other reasons, the use of the leak
detector must be checked separately.
Walls of storage
medium
Overpressure valve
for interstitial space
Operat-
ing
mode
Suggested leak de-
tection medium or use
of the leak detector
prohibited
Permeable:
(e.g. interior wall
made of plastic)
Exists
C
Inert gas
I
Use prohibited
Does not exist
C
Inert gas
I
Use prohibited
5
Not permeable:
(e.g. double-
walled steel pipe)
Exists
C
Inert gas/air pressure
6
I
Inert gas
Does not exist
C
Inert gas/air pressure
I
Inert gas
5
The leak detector with inert gas can only be used for this application if the operator assesses the interstitial space to be
a zone 2.
6
The use of air pressure does not present any problems with interstitial spaces for pipes/fittings with a medium-
transporting area that is not permanently filled with product (e.g. filling lines).
When air pressure is used for interstitial spaces of pipes/fittings with a medium-transporting area that is permanently
filled with product, it must be assured that the product-transporting equipment (e.g. pumps) is suitable for zone 0 be-
cause in the event of a leak, air will be pressed into the product-transporting system.
If the pressure supply is performed using a pressure gas bottle, it is necessary to equip the pressure gas bottle with
residual pressure monitoring. In case of a notification (drop below the set residual pressure) the pressure gas bottle is to
be refilled or replaced with a full one.
Technical Data
