BCU 580 · Edition 11.15l
34
Valve proving system
Leakage rate
The BCU tightness test ensures that the leakage rate Q
L
is < 0.1% of the maximum flow rate Q
(N)max.
.
Leakage rate QL [l/h] =
Q
(N)
max. [m
3
/h] x 1000 [l/h]
1000 x 1 [m
3
/h]
Test volume V
p1
Test volume V
p1
is calculated from the valve volume V
V
,
added to the volume of the pipe V
R
for each additional
metre in length L.
L
V
p1
= V
V
+ L
x
V
R
Valves
Pipework
Type
Volume V
V
[l]
DN
Volume per metre
V
R
[l/m]
VAS 1
0.25
10
0.1
VAS 2
0.82
15
0.2
VAS 3
1.8
20
0.3
VAS 6
1.1
25
0.5
VAS 7
1.4
40
1.3
VAS 8
2.3
50
2
VAS 9
4.3
65
3.3
VG 10
0.01
80
5
VG 15
0.07
100
7.9
VG 20
0.12
125
12.3
VG 25
0.2
150
17.7
VG 40/VK 40
0.7
200
31.4
VG 50/VK 50
1.2
250
49
VG 65/VK 65
2
VG 80/VK 80
4
VK 100
8.3
VK 125
13.6
VK 150
20
VK 200
42
VK 250
66
The measurement time required for the test volume V
p1
must be set on the basis of the calculation using pa-
rameter 56.
For the calculation, see page 35 (Calculation exam-
ples).
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