31/10/2019
VACUUM LEAK DETECTOR
VLXE ..
- 19 -
o
The exhaust ends in Zone 1 (for example remote filling shaft or
catch area):
A detonation flame arrester is provided at the end of the ex-
haust line
7
. Condensate traps are to be provided at low points;
the liquid stop valve can be dispensed with if the end of the ex-
haust ends in an area that is liquid-tight according to the Water
Act (e.g. catch surface).
- Note: under some circumstances an exhaust line ending in the
open air must be marked with warning notices.
5.3.3 Several pipelines/interstitial spaces connected in parallel
- Lay connection lines at a gradient towards the interstitial space or
distributor. Fit condensate traps at low points in connection lines
and at all low points when laying simultaneously in the open air.
- Lay suction and measuring line at gradient to the distributor. If this
is not possible, place condensate traps at all low points.
- Connect a liquid stop valve in every connection line to the intersti-
tial space against the block direction.
This can prevent leaked fluid penetrating the interstitial spaces of
the other pipelines.
- If shut-off cocks are fitted in these connection lines, they should be
sealable in the open position.
- For pressure compensation vessel applications, see (p. 5.7.4 and
5.7.5):
Length of the measuring line from the pressure compensation ves-
sel (V=0.1 l)
8
:
Model 230…330: L
max
16 m
Model 410
L
max
12 m
Model 500
L
max
10 m
Model 570
L
max
8 m
IMPORTANT:
The lower edge of the pressure compensation ves-
sel may not be lower than the node point. The upper edge of the
pressure compensation vessel may not be more than 30 cm above
the node point.
Per 10 ml of the condensate trap(s) used in the measuring line be-
tween the pressure compensation vessel and the leak detector
L
max
falls by
0.5 m
- OR (as an alternative to the pressure compensation vessel)
50% of the entire measuring line length must be laid at a gradient
of 0.5 to 1% to the node point.
L
min
= 0.5 x entire length of the measuring line.
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The detonation flame arrester can be dispensed with if the exhaust is laid in such a way that it is frost-free
and kinking (e.g. laying in the protective pipe) or stopping up of the exhaust can be excluded.
8
Multiplying this volume leads to the same multiplying of L
max
.
Installation