Honeywell Krom Schroder BCU 580 - Page 34

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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