Overfill prevention divice type BC-1
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CALCULATION OPTION FOR THE ADJUSTING DIMENSION X
a = dimension a= H - L
1
- b
b = tank wall thickness
H = height or diameter of the tank
k = height bushing or threaded flange
1. Maximum volumetric flow rate of the booster pump of the road tanker
Q
max
l/min
2. Switching and closing delays of the booster pump of the road tanker
Time
Level sensor according to measurement / datasheet
t
1
s
Switch / relay / or similar
t
2
s
Booster pump, flow time
t
3
s
Shut-off fitting:
•
mechanical, manually operated time alarm to closing start, closing time:
•
electrically, pneumatically, or hydraulically operated, closing time:
t
4
s
s
Total time (t
ges
= t
1
+ t
2
+ t
3
+ t
4
):
t
ges
s
3. Overrun volume
V
4
Overrun volume from delays:
V
1
=
Q
max
• (
t
ges
/ 60)
V
1
L
Overrun volume from filler line:
V
2
= (
π
/ 4) •
D
i
² •
L
FL
/ 1000
D
i
= internal pipe diameter in mm
L
FL
= length of the filler line in m
V
2
L
V
4
=
V
1
+
V
2
V
4
L
4. Level
L
1
Volume at admissible level 95%
(V/V)
V
3
L
Overrun volume
V
4
L
Volume at level
L
1
V
5
=
V
3
-
V
4
V
5
L
Then, the volume at level
V
5
value results, in combination with the calibration chart or by
calculation, in the level
L
1
.
The adjusting dimension
X
for the GWG must be determined taking into account* the tank
shape:
Installation on tank ceiling:
X = H - L
1
- b
=
mm
*
if applicable Take into account ADJUSTING DIMENSION
X
AND SUBSEQUENT LEAK
PROTECTION LINING
