DEHN protects pipelines
Decoupler DASD: Robust and powerful
Protect employees, limit overvoltages, prevent AC corrosion
The decoupler DASD provides protection against transient, temporary and long-duration overvoltages.
This means:
- Protection against impermissibly high touch voltages for people working on the pipeline
- Protection for systems and components
- Protection against AC corrosion
This has the advantage that the desired cathodic protection potential (DC potential) of the pipeline is not negatively affected.
DASD - DEHN Advanced Solid State Decoupler
Interference voltages - A common problem
They lead to AC corrosion across the pipeline and to personal injury and material damage.
Examples of sources of interference:
- Stray currents - These are caused by electric railways and are injected into the pipeline via the ground. Corrosion damage occurs which changes the potential of the pipeline.
- Electromagnetic fields - High-voltage lines generate electromagnetic fields which are injected into the pipelines which run in parallel. The undesirable consequences are alternating current corrosion (AC corrosion) and high touch voltages.
- Potential gradient areas in the ground - These are caused by earth faults and lightning strikes. High overvoltages can travel throughout the entire pipeline network if such a potential gradient area affects the pipeline.
The solution
DASD allows you to limit long-duration AC voltages to safe values. The cathodic protection potential across the pipeline (DC potential) is not affected.
Safety for your employees
In case of failure of the DASD, the device enters a fail-safe state – People working on the pipeline are still protected against touch voltages.
Applicable anywhere
DASD is independent of an external power supply. The decoupler can therefore be used anywhere - even in places where, depending on the situation, there is a particularly high risk of interference voltages, potential changes or stray currents.
1 IP68 housing - Water- and dustproof, for outdoor installation
2 Integrated test socket - For easy functional testing of the decoupler
3 High discharge capacity - Transient 100 kA, temporary 3.7 kA, long-duration 45 A
4 Clearly marked - No danger of confusing the pipeline and earth connection
5 Fail-safe failure mode - Safe state in case of overload
Flexibly installed
Whether on the outside of a wall, on a mast or in an underground system - DASD always fits.
Compact, in a dustproof and waterproof IP 68 enclosure, the decoupling device can be installed above or below ground. It shows its strengths especially in rough, inhospitable environments.
Various installation options for the DASD decoupling device:
Fields of application
Typical fields of application
- Cathodic protection systems, e.g. pipelines or storage tanks
- Indirect earthing of cable shields in accessible places
- Corrosion-free interconnection of separate earth-termination systems, e.g. operating earth and signal ground.
Protection goals at a glance
- Mastering interference voltages
- Prevention of AC corrosion
- Protection of pipelines and people
Decoupler DASD
CE-compliant protection solution.
Manufacturer-tested and CE-certified.
