Leaders in Pipelin
e Survey Systems
C
C
C
-
-
-
S
S
S
C
C
C
A
A
A
N
N
N
2
2
2
0
0
0
1
1
1
0
0
0
SYSTEM MANUAL Version 6.03i
88
Glossary
Anomaly
– An area or section of pipeline that looses current resulting in high attenuation
values. Until excavated and proved as a fault, these areas are defined as anomalies.
Attenuation
– The logarithmic loss of current along a length of pipeline in mB/m.
Coating Conductance
– The ability of a pipeline coating to conduct an electrical current.
Measured in
μ
S/m
2
.
Coating Resistance
– The ability of a pipeline coating to resist an electrical current.
Measured in
Ω
.m
2
.
Chainage
– Distance reference from a survey Start Point, as opposed to the previous data
point.
Close Interval Survey
– Current only survey conducted at pre-determined distance
intervals to pin point a coating anomaly with greater accuracy.
CP Test Post
– Test post with an electrical connection to the pipeline used to measure
Cathodic Protection voltages.
Data Point
– A reading taken with the Detector produces a single data point.
DCAPP
– Data Capture, Archiving and Plotter Program. Dynalog’s proprietary software
for downloading data from a C-SCAN Detector.
Dielectric performance
– The ability of the coating to act as an electrical insulator
Earth Extension Lead
– Used to extend the distance between the Signal Generator and
the Earth Spikes.
Fault/Defect
– Damage to the coating of a pipeline resulting in an electrical path.
Firmware
– Core programme running inside the Detector
Ground Lead
– Used to connect the Signal Generator to the Earth Spikes.
GPS Distance
– The distance between two points in straight line. This can differ to the
actual distance when measuring the route of the pipeline.
Halving
– The technique used to take readings half way between the previous two
readings, thus isolating each half of the section to aid in finding anomalies.
Hazardous Area
– An area that requires intrinsically safe devices.
Injection Point
– The location of the connecting point between the Signal Generator and
the pipeline under survey. The location may be know precisely, e.g. when connecting
using a valve/insulating joint, or not precisely e.g. when connecting via a CP test post
whose own connecting point is not known exactly.
Insulating Joint/Flange
– Electrically isolating connector between two pipeline sections.
Loop Impedance
– The accumulative impedance of the Signal generator to pipeline
circuit, which consist of the Signal Generator to pipeline, pipeline to ground, ground to
earthing system and earthing system back to Signal Generator.
Pipe Lead
– Used to connect the Signal Generator to the Injection Point.
Pipeline Position Indicator
– Circular graphic displayed on the Detector showing the
direction of the pipeline in order to guide the user.
Soil Resistivity
– The AC resistance component of the soil in contact with the pipeline.
Measured in
Ω
.cm
Start Point
– The ident give to signify the beginning of a new survey.
Survey
– A series of stored data points
TR Station
– Transformer Rectifier station producing a negative cathodic voltage.
