ROTHENBERGER ROTEST GW Digital V2.3 USB - Manual (Page 17)

ENGLISH 17
Where the operational pressure in the pipe is >30
mbar to 100 mbar, the pipe must be tested using
the prevailing operational pressure in the pipe (e.g.
38 mbar, 53 mbar, 88 mbar, etc.).
The unit displays the pressure which is present in
the pipe.
Where the operational pressure is between 27
mbar and 30 mbar, this pressure must be throttled
back to 27 mbar using the precision pressure
regulator.
Leakage then causes the pressure to continue to
fall. The existing ACTUAL pressure is displayed. The
unit starts testing automatically when the pressure
falls to 23 mbar.
This is indicated on the display with ”TEST
PRESSURE FALL” + ”READ IN LOSS def”.
If there is no leak in the pipe, the unit establishes
after a certain time that there has been no loss of
pressure and stops testing. The leak quantity is
shown as 0 l/hr on the print-out.
The volume-related test times and preconditioning
times are stored in the software. The unit
automatically calculates the volume of the pipe.
Finally, the leak quantity is displayed in l/hr. The
evaluation based on this quantity is also displayed.
The different G600 April 2008-compliant ratings
are stored in the software. The unit automatically
assigns the test result to the rating.
The following ratings apply to pipes with
operational pressures of up to 30 mbar (test
pressure 23 mbar):
- < 1 l/hr Unrestricted usability (pipe does not
need to be sealed off)
- 1 l/hr - ≥ 5 l/hr Reduced usability (pipe must be
sealed off within 4 weeks; pipe must be
pressuretested before being brought back into
service)
- > 5 l/hr Unserviceable (pipe must be taken out
of service immediately)
For pipes which have an operational pressure of
> 30 mbar to 100 mbar, only the leak quantity
result is displayed. The rating, depending on the
result, must be obtained from the gas supplier
The values can be stored. The test results can be
logged using the printer (see Using the Printer).
Pressure Test F
If a leak rate of 1-5l/h is calculated in the leak
quantity measurement, a pressure test must be
carried out prior to resealing, in order to establish
any corrosion damage
1 Structure the test layout as per figure F, but
with no test pump or shut-off valve.
2 Switch the unit on, start the GAS PIPE, enter
the project number and start the PRESSURE
TEST.
3 Confi rm the standard test pressure presetting
or enter other values.
4 On request, calibrate the zero point using the
key.
5 Build up the desired test pressure using the
pressure pump and close the shut-off valve.
6 Start the pressure test using the key and
end it after 3-5 minutes by means of the
key.
The test results can be logged using the printer
(see “Using the Printer”).
Water Pipe Leak Test
Test Medium: Air D
Test unfi lled water pipe networks with air.
Structure the test layout as per fi gure D. Use the
lowpressure sensor (blue).
The test is performed as described in “Gas Pipe
Leak Test, Test Medium: Air”. No preliminary test is
required.
Water Pipe Leak Test
Test Medium: Water G
Test already fi lled water pipe networks with water.
Make sure that the water pipes are completely free
of air.
Structure the test layout as per fi gure G. The test
is performed as described in “Gas Pipe Leak Test,
Test Medium: Air”. No preliminary test is required.