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Details of the test:
With the flue gas analyzer CHEMIST 600 (according to the model) it is possible to test gas lines (DVGW TRGI
2008).
This test procedure is valid for gas lines with maximum operating pressure of 100 mbar:
The Standard DVGW TRGI 2008 is valid for new or after servicing existing gas lines. The tightness test uses a
test pressure of 150mbar (test gas: air) all other parameter have to be selected according the gas line volume:
waiting time and time duration for the test (time duration were the gas line is under pressure with 150 mbar).
* Benchmark
waiting time (Stabilization phase): You can edit manually the waiting time according to the volume of the gas
line before you start the test procedure. The range is variable from 10 … 99 minutes.
P: Current pressure measured when waiting time started.
∆P1': Current pressure difference.
wait time: Time to stabilize the pressure in the gas line, the pressure must be higher than 150 mbar. On the
display is the timer shown (count backwards).
Minimum duration time of tightness test according to the volume of the gas line: duration time
Waiting time according to the volume of the gas line: wait time
After the waiting time is finished the tightness test can start.
During the tightness test the following values measured for the duration time of the test will shown at the display:
P1: Pressure measured at the moment the tightness test begins (minimum 150 mbar).
P2: Current measured pressure.
∆P: Pressure difference between start and finished test; negative value means pressure drop.
Result: tight or leak.
According to DVGW TRGI 2008 - no pressure drop is allowed!
It is possible to enter the data of the gas line (e.g. location, …). They are shown later on the print out (report).
If duration time or waiting time varies (according the DVGW Standard) you can change the used time by yourself.
The loading and the serviceability test can not be tested with the flue gas analyser CHEMIST 600, you have to
use other measuring devices.
Tightness test - DVGW TRGI 2008
Volume of the gas line * Waiting time
before test starts
min. duration for the
test
< 100 liter 10 min 10 min
≥ 100 l bis 200 liter 30 min 20 min
≥ 200 liter 60 min 30 min
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