BS EN 15280-2013 pdf download.Evaluation of a.c. corrosion likelihood of buried pipelines applicable to cathodically protected pipelines.
3.4
copper/copper sulphate reference electrode (CSE)
reference electrode consisting of copper in a saturated solution of copper sulphate
3.5
a.c. voltage
voltage measured to earth between a metallic structure and a reference electrode.
3.6
interfering system
general expression encompassing an interfering high voltage a.c. electric traction system and/or high voltage a.c. power supply system
3.7
Interfered system
system on which the interference effects appear
Note 1 to entry: In this European Standard, it is the pipeline system.
3.8
pipeline system
system of pipe network with all associated equipment and stations
Note 1 to entry: In this European Standard, pipeline system refers only to metallic pipeline system. Note 2 to entry: The associated equipment is the equipment electrically connected to the pipeline.
3.9
earth
conductive mass of the earth, whose electric potential at any point is conventionally taken as equal to zero
[SOURCE: IEC 60050 826-04-01]
3.10
operating condition fault free operation of any system
Note 1 to entry: Transients are not to be considered as an operating condition.
fault condition
non intended condition caused by short-circuit to earth, the fault duration being the normal clearing time of the protection devices and switches
Note 1 to entry: The short circuit is an unintentional connection of an energised conductor to earth or to any metallic part in contact with earth.
3.12
conductive coupling
coupling which occurs when a proportion of the current belonging to the interfering system returns to the system earth via the interfered system or when the voltage to the reference earth of the ground in the vicinity of the influenced object rises because of a fault in the interfering system, and the results of which are conductive voltages and currents
3.13
inductive coupling
phenomenon whereby the magnetic field produced by a current carrying circuit influences another circuit; the coupling being quantified by the mutual impedance of the two circuits, and the results of which are induced voltages and hence currents that depend for example on the distances, length, inducing current, circuit arrangement and frequency
3.14
capacitive coupling
phenomenon whereby the electric field produced by an energised conductor influences another conductor, the coupling being quantified by the capacitance between the conductors and the capacitances between each conductor and earth, and the results of which are interference voltages into conductive parts or conductors insulated from earth, these voltages depend for example on the voltage of the influencing system, distances and circuit arrangement
3.15
interference
phenomenon resulting from conductive, capacitive, inductive coupling between systems, and which can cause malfunction, dangerous voltages, damage, etc.
3.16
disturbance
malfunction of an equipment losing its capability of working property for the duration of the interference
Note I to entry: When the interference disappears. the interfered system starts again working property without any external intervention.
3.17
damage
permanent reduction in the quality of service, which can be suffered by the interfered system
EXAMPLE coating perforation, pipe pitting, pipe perforation, permanent malfunction of the equipment connected to the pipes. etc.
Note I to entry: A reduction in the quality of service could also be the complete cancellation of service.
3.23
OFF-potential (EoFF)
structure to electrolyte potential measured immediately after synchronous interruption of all sources of applied cathodic protection current
3.24
ON-potential (EON)
structure to electrolyte potential measured with the cathodic protection current flowing
3.25
spread resistance
ohmic resistance through a coating defect to earth or from the exposed metallic surface of a coupon to earth
Note 1 to entry: This is the resistance which controls the d.c. or a.c. current through a coating defect or an exposed metallic surface of a coupon for a given d.c. or a.c, voltage
3.26
coupon
representative metal sample with known dimensions
Note 1 to entry: A coupon may be electrically connected to the pipeline.
Note 2 to entry: Examples of coupons are given in Annex B.
3.27
probes
device incorporating a coupon that provides measurements of key parameters to assess the corrosion risk
Note 1 to entry: Examples of probes are given in Annex B,
4 Cathodic protection personnel competence
Personnel who undertake the design. supervision of installation, commissioning, supervision of operation. measurements, monitonng and supervision of maintenance of cathodic protection systems shall have the appropriate level of competence for the tasks undertaken.
EN 15257 constitutes suitable methods of assessing competence of cathodic protection personnel, which may be utilised.
Competence of cathodic protection personnel to the appropriate level for the tasks undertaken should be demonstrated by certification in accordance with qualification procedures such as EN 15257 or any other equivalent scheme.BS EN 15280-2013 pdf download.