SGB VLR 330, Документация, Страница: 20 / 48

VACUUM LEAK DETECTOR VLR .. and VLR .. MV
20/05/2020
- 20 -
o
For applications with pressure compensation vessel (see 5.7.4 and
5.7.5):
Length of the measuring line from the pressure compensation ves-
sel (V=0.1 l)
5 :
Type 330: L
max
16 m
Type 410 L
max
12 m
Type 500 L
max
10 m
Type 570 L
max
8 m
CAUTION: The bottom edge of the pressure compensation vessel
must not be lower than the node point; the upper edge of the pres-
sure compensation vessel must not end more than 30 cm above
the node point.
For each 10 ml of the condensate trap(s) used in the measuring
line between the pressure compensation vessel and leak detector,
L
max
is reduced by 0.5 m
o
OR (alternatively to the pressure compensation vessel)
50% of the overall length of the measuring line must be laid with a
0.5 to 1% downward gradient to the node point. L
min
= 0.5 x total
length of the measuring line.
5.3.4 Several pipeline interstitial spaces are connected in series
The liquid stop valves installed against the direction of flow (27*) pre-
vent the other interstitial spaces from becoming filled with liquid in the
event of a leak in a pipeline.
The interstitial space volumes of the connected pipes must meet the
following conditions:
3
∙ V
IS 1
> V
IS 1
+ V
IS 2
+ V
IS 3
+ V
IS 4
and
3 ∙ V
IS 2
> V
IS 2
+ V
IS 3
+ V
IS 4
, etc.
V
IS (number)
is the volume of the respective interstitial space. No. 1 is the
interstitial space the suction line is connected to (see 5.7.6)
5.4 Completing Pneumatic Connections
5.4.1 Assembling the connection to the pipeline interstitial space or test valves
(1) Generally according to the specifications provided by the manu-
facturer of the pipeline/interstitial space.
(2) If Schrader valves are used, please proceed as follows:
o
Unscrew protective cap
o
Re-tighten lock nut
o
Unscrew valve insert and stick next to the connection with ad-
hesive tape. (As evidence of disassembly)
o
Screw connection to the interstitial space or test valve and fas-
ten finger-tight
o
If necessary, further tighten with suitable pliers
5 If this volume is multiplied, L
max
is multiplied in the same way.
Mounting