ROTHENBERGER ROTEST GW Digital V2.3 USB - Manual (Page 16)

16 ENGLISH
Gas pipe leak test
Test medium: air D
Gas pipe pressure tests are divided into load tests
and leak tests.
Connect the high pressure sensor (red) for a load
test and the low pressure sensor (blue) for a leak
test.
Testing takes place in two phases: a
preconditioning phase and a test phase of at least
10 minutes. These depend on the type of testing
undertaken and the volume of the pipe (see table
below for preconditioning times and test times).
Only the data from the test phase is stored.
During the preconditioning and test phases,
the instantaneous pressure, temperature and
time values can be called up by pressing a key
(keys
and ).
1 Structure the test layout as in Fig. D. Use the
high pressure sensor (red) for the load test
2 Switch the unit on, start GAS PIPE, enter the
project number and start LOAD TEST.
3 Build up the required test pressure using the
pressure pump and close the shut-off valve
4 Start LOAD TEST using key .
The unit starts with the preconditioning phase
and ends it automatically after 10 minutes. The
test phase starts when key
is activated.
The test phase is automatically ended after the
set test time elapses.
The preconditioning phase and test phase can
also be ended manually using key .
5 Remove the high pressure sensor and connect
the low pressure sensor (blue)
6 The LEAK TEST is carried out in the same way
as the preliminary test. Only the
preconditioning times and test times are
different, as they depend on the pipe volume
selected
Use the manual bellows to build up the test
pressure (0...250 mbar).
The values can be stored.
The test results can be logged using the printer
(see Using the Printer).
Preconditioning times and test times in relation to
pipe volume:
Pipe volume Precond. time Min. test time
< 100 l 10 min 10 min
≥ 100 l < 200 l 30 min 20 min
≥ 200 l 60 min 30 min
Gas pipe leak test
Usability test E
The usability test is prescribed for the testing of gas
pipes that are already in use and need to be tested
on a regular basis. This involves calculating the
precise quantity of gas escaping over a specific
time.
1 Structure the test layout as in Fig. E. To
operate the leak quantity pump (LQP) by
electrical means, connect a power supply unit
or battery to the basic unit (see 4 in Fig. A)
The low pressure sensor (blue) needs to be
connected to carry out a usability test.
N.B. The cable for the leak quantity pump may
only be connected to or disconnected from the
basic unit when it is switched off!
2 Switch on the unit, start menu item GAS PIPE,
enter the project number and start USABILITY
TEST.
3 The unit sends an instruction via the data
transmission cable of the LQP to the GW
Digital LQP interface to connect (see 12 in Fig.
A).
The command for this is ”ATTACH PUMP
WITHOUT PIPE”. The coupling on the LQP must not
be connected yet to the test pipe.
The LQP then moves forward automatically and
discharges its capacity. This action discharges the
trapped air which is stored and the cylinder piston
moves to the specifi c home position. This action
takes place while displaying the message ”PUMP
MOVING TO HOME POSITION”.
Once the LQP has moved to its foremost position,
the test pipe can be connected. The main shut-off
device (MSD) then needs to be opened so that the
section of test pipe is fl ooded with gas and
operational pressure is restored. The command for
this is ”PIPE ON + MSD OPEN”.
Now the cylinder piston moves back from the LQP
in order to fi ll the cylinder storage space with gas.
This action takes place while displaying the
message ”PUMP FILLING”. Once the LQP is full, the
MSD needs to be closed. The command for this is
”CLOSE MSD!” (Before this command is displayed,
the software allows suffi cient time for operational
pressure in the pipe to be restored before the MSD
is closed.) In accordance with the new DVGW-TRGI
[the German Technical and Scientifi c Association
for Gas and Water’s Technical Regulations for Gas
Installations] G600 Worksheet issued in April 2008
and the DVGW’s VP 952 provisional type testing
basis, pipes must be tested which have an
operational pressure of up to 30 mbar with a
pressure of 23 mbar.