PRESSURE LEAK DETECTOR DLR-P ..
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7.3.1 Test scope
Two persons may be required to perform a functional check, depend-
ing on the type of pipeline and how it is laid.
(1) Coordinate the work to be performed with those responsible for
operation on site.
(2) Observe the safety instructions for working with the product to be
conveyed.
(3) Check the test valve at the end of the interstitial space pointing
away from the leak detector for tightness and contamination, and
clean it, if necessary.
(4) Checking the free passage of air in the interstitial space (section
7.3.2)
(5) Testing the switching values (section 7.3.3)
(6) Testing the overpressure valve and/or the overpressure pump
delivery head (section 7.3.4)
(7) Tightness test following commissioning or correction of malfunc-
tions (section 7.3.5)
(8) Tightness test as part of the annual functional check (section
7.3.5)
(9) Creating the operating condition (section 7.3.7)
(10) A qualified person must complete a test report, confirming func-
tional and operational safety.
7.3.2 Checking the free passage of air in the interstitial space
Checking the free passage of air ensures that the interstitial space
connected to the leak detector allows sufficient passage to cause an
air leak to trigger an alarm.
If several interstitial spaces are connected in parallel, each one of
them must be checked for passage.
(1) Attach measuring gauge to connection on three-way valve 21
and turn valve 180°.
(2) For pipelines in accordance with 5.8.1 and 5.8.2:
Open the test valve at the end opposite the leak detector; in case
of multiple pipe interstitial spaces, the test valves must be
opened sequentially at the end opposite the leak detector.
For pipelines in accordance with 5.8.3 and 5.8.4:
Turn three-way valve 20 90° (UZS) so that the pressure lines and
system are ventilated.
(3) Check whether the measuring gauge registers a pressure drop. If
no pressure drop occurs, locate and correct the cause.
(4) Return three-way valve to the operating position and remove the
measuring gauge.
Functional Check and Maintenance
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