Instruction Manual Dräger P7-TDX
20
9.4 Tightness tests according to DVGW TRGI 2018 process sheet G 600
A tightness test must be conducted and documented for every new or significantly modi-
fied gas installation.
For this tightness test, the pressure in the gas pipeline to be tested must increased to
somewhat more than 150 hPa (mbar) according to DVGW TRGI 2018.
After the stabilization period for temperature equalization, the pressure in the gas pipeline
to be tested is measured for the required time period. The stabilization periods and test
times are each defined according to the volume of the line (line sections) to be tested.
9.4.1 Automatic tightness test
The P7-TDX enables a direct selection and an automatic
identification of the gas pipeline volume.
The automatic identification of the gas pipeline volume can
be helpful for significantly changed operating lines because
these lines can, for the most part, be flush-mounted and
therefore, concealed.
In the case of automatic measurement, the pipeline volume is
determined after connecting the gas pipeline to the measur-
ing device.
To do so, the pressure in the pipeline to be tested is in-
creased to approximately 30 hPa (mbar) using the pump of
the measuring device.
If the stabilization period is over or (
CONTINUE
) was pressed,
the volume measurement starts.
The result with the corresponding stabilization and measure-
ment period is shown.
Using (
CONTINUE
), the stabilization period and test time (e.g.
10/10min.) resulting from the volume range is accepted.
