DCVG & CIPS (Direct Current Voltage Gradient) (close Interval Pipe-to-Soil Potential Survey)

Made in : England 
Manufacturer : DCVG
DCVG stands for Direct Current Voltage Gradient, which is a survey technique used for locating coating faults that can be further used for assessing the effectiveness of corrosion protection on buried steel structures, usually oil, natural gas, water or any steel structures that have CP (Corrosion Protection) applied to it. Pipelines are monitored using this technique to aid the user to locate coating faults and also highlight any kind of deficiencies in their cathodic protection.
Steel Structures will eventually corrode if not provided with corrosion control such as CP and the rate of corrosion can be unacceptably rapid in some soils or where exposed to salt water. Usually pipes are covered in more than one protective coating corrosion will still be likely to happen anyway with buried pipes. Before the use of DCVG, assessing the condition of the pipeline was indirect and could load to expensive excavations but with DCVG you can pinpoint coating faults and their severity avoiding disturbance to the pipeline.
DCVG Ltd is pleased to confirm continued success with Quantum CIPS (Close Interval Pipe-to-Soil Potential Survey) pipeline survey equipment. This state of the art equipment has been specifically designed so that CIPS data, for the first time, can be properly collected simultaneously with DCVG coating fault survey data. This allows two independent techniques, CIPS and true DCVG (using an analogue meter) to be cost effectively run simultaneously thus satisfying a major requirement in data collection as set out in the NACE ECDA RS 0502-2008. The Quantum data logger uses GPS technology to stay synchronized with multiple DCVG Ltd controlled GPS interrupters used to simultaneously pulse multiple pipeline Cathodic Protection Rectifiers. 

Principles of CIPS
The widely practiced technique to monitor pipe to soil potentials of a buried pipeline is to take measurements using a saturated copper/copper sulphate electrode and a high resistance voltmeter, making electrical contact to the pipeline at test posts that are usually spaced at regular (1-2 km) intervals along the pipeline route. The problem with such measurements is that they reflect only what is happening one or two meters either side of the test post. Hence what happens to the pipe to soil potentials between test posts is largely unknown.
Carrying out a full CIPS survey over an entire pipeline route will enable an engineer to understand how the CP system is functioning from taking pipe to soil measurements continuously.

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