SGB DLR-GS PMN Series, Documentation

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OVERPRESSURE LEAK DETECTOR DLR-GS ..
10/09/2014
- 2 -
1. Subject
Overpressure leak detector without built-in pressure generator for double-walled pipes and
fittings, with inert gas or air used as the leak detection medium.
DLR-GS .. (the dots are replaced by the respective alarm pressure in bar)
2. Area of use
2.1. Requirements for interstitial spaces

Verification of the pressure resistance of the interstitial space (see Appendix B, column
"p
TEST
" for the minimum test pressure for the interstitial space)

Verification of suitability of the interstitial space (for Germany: building authority certificate of
suitability).

Leak-tightness of the interstitial space (see section 6.4.4)

The number of interstitial spaces to be monitored depends on the overall volume of the
interstitial space. According to EN 13160, this must not exceed 10m
3
. In order to make it
possible to verify the leak tightness of the interstitial space, we recommend that a value of
4 m
3
is not exceeded.
The length of pipe which is to be monitored (per pipe branch) should not exceed 2500 m or
as specified in the approval requirements of the pipeline.
2.2. Pipes

Double-walled pipes made of metal or plastic, assembled in the plant or on-site.
For Germany: more far-reaching requirements for double-walled pipes may result from
TRbF 50, the DIBt approval principles or EN 13160.

ONLY for applications where temperature fluctuations will not exceed

10°C (e.g. double-
walled pipes installed underground or through buildings; no hot fluids).
2.3. Fittings

Double-walled fittings made of metal or plastic, assembled in the plant or on-site.
For Germany: with Allgemeine bauaufsichtliche Zulassung (General Building Authority
Approval), where not included in the approval of the pipeline.

ONLY for applications where temperature fluctuations will not exceed

10°C (e.g. fittings
installed underground or in buildings; no hot fluids).
2.4. Materials carried in the pipes / leak detection medium

Water-pollutant fluids
– With flashpoint >55°C with air or inert gas used as the leak detection medium
– With flashpoint <55°C with inert gas used as the leak detection medium as long as
the interstitial space has been classified by the operator as zone 2
– Which do not react with the leak detection medium