6. Determining the leakage rate
The leakage rate is calculated automatically with the following equations (4)
and (5) and so complies with the procedure under DVGW-TRGI worksheet G
624:
V
B
gas leakage rate in operating mode in l/h
V
L
air leakage rate at test pressure
p
Omax
max operating pressure of the gas in situ
p
start
test pressure at start of measurement
p
end
test pressure at end of measurement
p
abs
absolute air pressure, entered manually under Abs. pressure in the
menu Setup (default 1013 hPa)
f (absolute air viscosity)/(absolute gas viscosity), selection stored in
Setup under Gas
T
meas
measuring time converted to hours (default 1 min)
V
pipe
cubic capacity of the test section in litres (see Figure 7
V
L
=
V
Rohr
T
mess
p
akt
+ p
Start
p
akt
+
p
Stopp
•
•
- 1
(5)
V
B
= V
L
•
• f
•
•
(4)
p
Bmax
p
Start
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