SGB DLR-GS PMN Series, Документация

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OVERPRESSURE LEAK DETECTOR DLR-GS ..
10/09/2014
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(8) Open stop cock 2.2.
(9) Pressure build-up until pressure setpoint; during filling, monitor the pressure on the
pressure reducer (test pressure must not be exceeded) and re-adjust if necessary.
(10) Close stop cock 2.2 once the pressure setpoint is reached.
(11) Repeat steps (7) to (9) several times if necessary until the possible pressure equalizing
processes are completed.
(12) Close the shut-off valve on the pressure reducer, remove the test device from its
connection, remove the measuring instrument and pressure accumulator from the test
device.
6.4.4 Leak test
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(1) Insert the measuring instrument for the test into test connection 51, and connect the test
device to connection 6.2 (see also P-115 520 No. I).
(2) The current pressure is shown on the measuring instrument.
(3) For a full year of fault-free operation, the leak test is to be assessed as positive if the
following conditions are maintained:
Work out the difference between the measured value for "Feed (filling) OFF" and "Alarm
ON" and convert to mbar (x 1000). Divide the result by 8760 (hours in a year). That gives a
maximum tolerable pressure drop (per hour) to prevent an alarm being triggered before the
end of one year.
If the value calculated is not measurable, the pressure drop can be multiplied for a
corresponding multiplication of the testing time.
Example:
Difference between the above-mentioned switching values: 1.75 bar (value measured
on-site)
1.75 x 1000 = 1750
1750 / 8760 = 0.2 mbar / h (permitted pressure drop)
The measuring instrument available on-site allows "only" a value of 5 mbar to be read,
which is 25 times the permitted value (5 / 0.2). That means that the testing time is
increased to 25 hours.
(4) The values stated above should be achieved in order to ensure a full year of fault-free
operation.
(5) After carrying out the leak test, remove the test device from its connection and remove the
measuring instrument from the test device.
6.4.5 Setting up the equipment ready for operation
(1) Seal the housing and test valve(s) at the end of the interstitial space away from the leak
detector.
(2) If stop cocks are used in the connecting lines, seal them (if an interstitial space is
connected) in their open position.
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In this section, it is assumed that the pressure in the interstitial space has been built up to the setpoint
and pressure compensation has taken place.