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Instruction Manual Dräger P7-TD
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.
9.5.2 Regulations for medium pressure systems
A combined stress and tightness test must be conducted for
gas installations in new medium pressure systems (operating
pressure 100 hPa (mbar) to 0.1 MPa (1 bar)).
To do so, the pressure in the gas pipeline must be increased
to 0.3 MPa (3 bar).
After temperature equalization (3 hours), the pressure in the
gas pipeline is measured for
2 hours. The test duration must be prolonged by 15 minutes
per additional 100 l volume for pipeline volumes exceeding 2,000 l.
9.5.3 Starting a stress test
If the 0.3 MPa (3 bar) test was selected, the pipeline volume must be indicated first.
The 0.3 MPa (3 bar) test can only be executed with an external high pressure sensor.
Set the pipeline volume and the measurement period determined based on it and start the
measurement using
.
(CONTINUE)
If the 0.1 MPa (1 bar) test was selected, the stress test is started immediately.
Connect the pipeline to be tested with the pressure inlet of the measuring device marked
with "bar" using a pressure hose with a pneumatic quick coupling NW 5 and connect the
external pump to the line via a valve.
Increase the pressure to 0.1 MPa (1 bar) or for medium pressure systems, to
0.3 MPa (3 bar).
Low pressure systems: The measuring device defines the duration of the
stabilization phase depending on the pressure stability in the gas pipeline (2 to 10 min). A
test time of 10 minutes is required for the measurement.
Medium pressure systems: A 3-hour waiting period is required for the stabilization
phase. The measuring device defines the duration of the measurement (at least 2 hours)
depending on the pipeline volume entered, according to the regulations of the TRGI
G 600.
The remaining sequence of a stress test is described in Chapter 11.1.
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