Corrpro Companies Europe LimitedAdam Street, Bowesfield Lane, Stockton on Tees, TS18 3HQ

Telephone: (01642) 614106 (8 lines) Telex: 587388 Fax: (01642) 614100 E-mail: ccel@corrpro.co.uk

Technical Product InformationCATHODIC PROTECTION

Pipeline Protection Surveying

PIPECAT DCVG NON-INTRUSIVE BURIED PIPELINECOATING DEFECT SURVEYING

IntroductionPipecat is the latest development in Direct CurrentVoltage Gradient (DCVG) pipeline coating-defectsurvey systems. It precisely locates coating defectswith real time categorisation of defect severity andcathodic protection effectiveness and allows greatersurvey speed than afforded by the Pearson method,yet provides the in-depth analysis of the Close IntervalOverline Potential Survey, as well as supplyingadditional information on coating defect severity thatis not available from conventional Pearson and otherclose interval survey data.

The Pipecat system can be operated by a one-manteam, and under most operating circumstances it ispossible to cover at least 7 kilometres per team perday, drastically reducing survey costs.

Proven in useThe system is also considerably less expensive than itsnearest competitor, and has already proven itsaccuracy. 5000+ kilometres of pipeline have been test-surveyed, with all excavations indicating the system'sreliability and its ability to comprehensively assesscoating defects and to categorise them through in-depth analysis.

Pipecat is specifically designed to be more userfriendly than traditional survey equipment. Easier toset up and light enough to be operated by one man(who does not need to be a cathodic protectionspecialist), the Pipecat can survey at walking pace,making routine monitoring extremely economical.Real-time evaluation of the defect severity is readilyaccomplished from the instrument without the needto return to the office to analyse the data.

Detection, location & CategorisationThe Pipecat is already at an advantage overexisting survey methods & categorisationbecause:

� no special transmitters are required

� contact probes are carried by one man

� actual cathodic protection potential gradients are measured

� remote sensing probes are not required

� No trailing wires are necessary

Once detected, the location of the coating defect orcurrent drain is accurately located by a series ofsimple measurements. Accuracy of location isachieved by using small probe spacing (300mm) andmeasuring equipotential points with the centre zerometer.

The centre zero instrument and the precisemeasurement system mean that, even where multiplepipelines are running in the same corridor and arebonded intentionally or not, coating defect locationwill be such that defects on individual pipelines canstill be identified and marked.

Surveying pipelinesunder bitumen roadsmay be carried outfrom the verge usingthe high resolutionrange. Comparison ofthe results from eitherside of the road willindicate theapproximate locationof the coating defect.Special techniques arepossible for the preciselocation of the defectunder the road, shouldthis be required.

Submerged pipelines may be readily surveyed from aboat or by divers.

The special measurement technique allows coatingdefect surveys to be conducted even in areas of straycurrent activity.

corrpro ®

Corrpro Companies Europe LimitedAdam Street, Bowesfield Lane, Stockton on Tees, TS18 3HQ

Telephone: (01642) 614106 (8 lines) Telex: 587388 Fax: (01642) 614100 E-mail: ccel@corrpro.co.uk

PIPECAT DCVG NON-INTRUSIVE BURIED PIPELINECOATING DEFECT SURVEYING

Industrial stary currents, AC currents, telluric currentsand interference currents from other cathodicprotection systems will not adversely affect theoperation of the survey system or the real-timeevaluation of coating defect severity.

The Pipecat is not only more effective in locating thecoating defects and categorising them. It can also beused to:

� track down unwanted interference currents

� locate unwanted bonds between pipelines

� verify interference checks between cathodic protection systems

� measure polarised pipe-to-soil potentials

Total Service CommitmentCorrpro Companies recognises that it is often not costeffective for customers to purchase the Pipecat systemand to direct in-house resources to field survey,particularly for limited surveys.

Corrpro Companies therefore offers a full field serviceand will undertake DCVG (and associated cathodicprotection) surveys on customers' behalf. The benefitsof this service include:

� fully trained and experienced operators

� operators with cathodic protection experience to optimise the benefit of a coating survey

� detailed categorisation of coating defects

� full reporting with clear recommendations for remedial action where required

� correlation of existing levels of cathodic protection with defects, including defining whether defects are adequately polarised

For further information about the Pipecat DCVGsystem and associated services, please call CorrproCompanies Europe's Industrial Division at the addressbelow.