Suites 1 & 2
Greenbank House, Hindley Green
Wigan, WN2 4AR
United Kingdom
Tel: +44(0)1942 522180 / 814442,
Fax: +44(0)1942 522179 / 814441
dcvg@dcvg.com or
sales@dcvg.com

Pipeline Operators should be aware of the fact that a number of instrument and pipeline survey companies are offering sham (fraudulent, deceptive, dishonest) techniques as DCVG. These sham techniques which are based on variations of CIPS (Close Interval Potential Surveys) bear no direct relationship to the true DCVG technique as invented in the early 80s by John Mulvaney.

Purveyors of these fraudulent methods obviously do not understand how the true DCVG technique works, and also can have very little understanding of the CIPS technique not to realise that the limitations and errors built into CIPS prevent it ever giving data similar in nature and quality to the true DCVG technique.

For ease of location and to minimise surveyor fatigue, the true DCVG technique uses an analogue meter. The surveyor, even when tired at the end of the working day, can still get quality data because the direction and amplitude of the pulsing needle is easy to interpret. This is not the case with a digital instrument where interpretation of value and sign of a set of numbers is difficult even under ideal conditions. For quality data things must be kept simple to use and interpret for the man in the field.

True DCVG is more than just location. Coating fault characteristics which can be determined only by an analogue meter are very important and are required for the decision making processes of what to rehabilitate.