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About This Item
Full Description
BS EN 50162:2004 is intended to offer guidance for:
- the design of direct current systems which may produce stray currents;
- the design of metal structures, which are to be buried or immersed and
- which may be subject to stray current corrosion;
- the selection of appropriate protection measures.
BS EN 50162:2004 mainly deals with external stray current corrosion on buried or immersed structures. However stray current corrosion may also occur internally in systems containing an electrolyte e.g. near insulating joints or high resistance pipe joints in a water pipeline.
These situations are not dealt with in detail in this standard but principles and measures described here are generally applicable for minimizing the interference effects.
Stray currents may also cause other effects such as overheating. These are not covered in this standard.
D.C. systems that can cause currents to flow in the earth or any other electrolyte, whether intentional or unintentional, include:
- d.c. traction systems;
- trolley bus systems;
- d.c. power systems;
- d.c. equipment at industrial sites;
- d.c. communication systems ;
- cathodic protection systems;
- high voltage d.c. (HVDC) transmission systems;
- d.c. track circuit signalling systems. For stray currents from traction systems EN 50122-2 gives requirements for minimizing their production and for the effects within the railroad.
Systems which may be affected by stray currents include buried or immersed metal structures such as:
a) pipelines;
b) metal sheathed cables;
c) tanks and vessels;
d) earthing systems;
e) steel reinforcement in concrete;
f) steel piling.
An affected structure carrying stray currents, e.g. a pipeline or cable may itself affect other nearby structures (see Clause 8).
BS EN 50162:2004 does not address the effect of a.c. stray current. Where a.c. stray current is suspected, care should be taken when taking measurements on any components due to risk of large induced voltages. If a.c. stray current interference is present the criteria described in this standard will not apply.
Cross References:
EN 50122-2:1998
EN 12954:2001
EN 13509:2003
EN 12499:1996
EN ISO 8044:1999
IEC 60050-604:1987
IEC 60050-826:1999