Cathodic Protection Transformer Rectifier FeSi Anód PCR Polarizációs Cella Petróleum Koksz

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Cathodic Protection (CP) is applied to buried steel Pipelines to complement the protection provided by pipe coating.
If the coating is damaged causing holidays, or if there is an electrical contact between the pipeline and another metal structure, it is necessary to increase the CP Current to compensate for the resulting losses.
Excessive current can be detrimental to the pipe. The engineer responsible for the pipeline integrity must therefore achieve a fine balance between effective protection and acceptable Current consumption.
If the current becomes excessive or the cathodic protection ineffective, the pipeline must be surveyed to search for the major fault location.
The Pipeline Current Mapper (PCM) has been specially designed to perform this function.
An old traditional pipeline locator is used to detect an AC Current (typically 750HZ) applied to the pipeline. Large signal losses are assumed to be due to large fault. In fact, the losses are also due to capacitance losses along the pipeline, so fault are very often masked by the natural decay of signal.
This current does not exactly mirror the CP D.C. Current. The effect can be particularly misleading at pipeline branches. Capacitance losses also limit the length of pipeline that can be surveyed in one operation.
The Pipeline Current Mapper is designed to overcome the shortcoming of the existing techniques and now provides pipeline engineers with an accurate, cost effective product that can be used in all weather types and ground conditions.
An extremely low “near D.C.” frequency (1HZ, 2HZ, or 4HZ) is used to mirror as closely as possible the D.C. current generated by the cathodic protection. It also avoids signal losses caused by capacitance so nearly all the signal loss is due to coating faults or shorts to other structures.
Conventional pipe locators cannot partially detect such a low frequency.
So the receiver is fitted with a precision high performance magnetometer. This detects and measures the (1HZ, 2HZ, or 4HZ) magnetic field. Advanced signal processing techniques filter and amplify the signal so that automatically current value (magnitude and direction) of the near D.C. signal can be seen in the LCD.
Internal data logger function enables the storage of this data so that current or dB of current versus distance, or number of readings can be plotted.