SGB DLR-GS PMN Series, Документация

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OVERPRESSURE LEAK DETECTOR DLR-GS ..
10/09/2014
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6.2. Maintenance
(1) Maintenance work and functional tests must only be performed by qualified persons
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.
(2) Once a year to ensure functional and operational reliability and safety.
(3) Scope of testing: as described in section 6.4.
(4) Also to be verified: that the conditions in sections 4 and 5 are satisfied.
6.3. Proper use

Only for double-walled pipes/fittings laid underground or through buildings, as set out in
sections 2.2 and 2.3.

The delivery pressure must be at least 1 bar lower than the minimum alarm pressure.

The system must be earthed in accordance with applicable regulations
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.

Leak-tightness of the leak detection system should be ensured according to section 6.4.4.

The leak detector must be installed outside the explosion hazard area.

Feedthroughs for connecting lines into and out of the manhole shaft are sealed gas-tight.

The leak detector should be (electrically) connected in a way which cannot be switched off.

Use of compressed air as the leak detection medium:
for conveyed fluids with flashpoint >55°C

Use of nitrogen as the leak detection medium:
for conveyed fluids with flashpoint >55°C
for conveyed fluids with flashpoint <55°C if the interstitial space is zone 2.
6.4. Functional tests
Testing of the functional and operational safety and reliability should be performed

at every commissioning

in accordance with the intervals set out in section 6.2
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
whenever a fault is rectified.
6.4.1 Scope of testing
(1) If necessary the work to be performed should be discussed with the person responsible
on-site.
(2) Observe the safety information regarding handling of the materials being conveyed.
(3) Check for leaks on the test valve at the end of the interstitial space away from the leak
detector, and check that it is free of dirt – clean as required.
(4) Continuity test of the interstitial space (section 6.4.2)
(5) Testing the switching values (section 6.4.3)
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For Germany: someone specialising in leak detection systems or under the supervision of such an
expert (if applicable, also with expertise in fire and explosion hazard protection; annual verification of the
company)
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For Germany: e.g. EN 1127
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For Germany: regional regulations must also be observed (e.g. VAwS)