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Instruction Manual Dräger P7-TDX
After selecting the pipeline volume, the gas pipeline is
pumped up and the current pressure in the pipeline (P) and
the already elapsed pump time (t) are shown.
The pump process can be terminated using (
) even
CONTINUE
if the required test pressure has not yet been reached.
If the pressure reached the test pressure, the internal pump
is automatically stopped.
The duration of the stabilization phase and the test time is defined according to the select-
ed pipeline volume.
The remaining sequence of a tightness test is described in Chapter 13.1. on page 33.
9.4.2 Tightness test with external pump acc. to DVGW TRGI process sheet G 600
The flow rate of the P7-TDX pump is approx. 1 l/min. The pressure increase to 100 hPa
(mbar) for a gas pipeline volume of 100 l takes approx. 15 min. Therefore, it makes sense
to work with an external pump, to shorten the time for pressure increase.
After starting the tightness test and connecting the gas pipe-
line to the P7-TDX, the measuring device gives the instruc-
tion to establish the pressure in the line.
Connect the external pump to the gas pipeline using a valve
and increase the pressure.
The P7-TDX starts the stabilization phase using (
).
CONTINUE
The duration of the stabilization phase and the test time is defined according to the select-
ed pipeline volume.
The remaining sequence of a tightness test is described in Chapter 13.1. on page 33.
9.5 Stress test acc. to DVGW TRGI process sheet G 600
9.5.1 Regulations for low pressure systems
A stress test must be conducted prior to the tightness test for gas installations for new low
pressure systems (operating pressure < 100 hPa (mbar)).
To do so, the pressure in the gas pipeline must be increased to 0.1 MPa (1 bar).
After temperature equalization (there is no time specified), the pressure in the gas pipeline
is measured for 10 minutes.
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