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Corrosion Services | DeltaQ Consultants

DeltaQ Consultants:

Cathodic Protection

DeltaQ Consultants is a provider of cathodic protection services, equipment and materials for pipeline and petroleum facility infrastructure. Designing and installing cathodic protection systems is a core activity and includes services, equipment and materials, field surveys, engineering design, material specification, installation, construction inspection and system commissioning.

Close Interval Survey

The Close Interval Potential Survey (CIPS) technique is targeted at assessing the cathodic protection effectiveness over the entire length of a pipeline. Cathodically protected pipelines are equipped with permanent test stations where electronic leads are attached to the pipeline to measure the pipe-to-soil potential. This potential should be sufficiently cathodic to ensure adequate corrosion protection. A OQ and NACE qualified technician will obtain the direct current pipe-to-electrolyte potentials at consistent intervals to evaluate the CP of the pipelines. To achieve accurate potentials, the technician establishes an electrical connection to the pipeline by means of a trailing wire connected to test stations. The coated copper wire unwinds from a spool as the operator walks the length of the pipeline the pipeline potential is measured with a set of reference electrodes at ground level, positioned directly over the pipeline at intervals of every 3 – 5 ft. While simultaneously collecting GPS data and potential data, our data loggers create accurate reference points to find true pipe-to-soil potential.

Direct Current Voltage Gradient

Direct Current Voltage Gradient (DCVG) survey is the most accurate method available to size and locate pipe coating defects. The technique is based on measuring the voltage gradients in the soil above a cathodically protected pipeline. Once the technician has recorded the DCVG measurements and GPS locations, the % IR {Percent Intensity (current) of Resistance} values are calculated. Depending on the degree of magnitude of the % IR, a determination can be made to indicate where physical examination and repair are necessary.

Direct Assessment

Internal (Inline) Corrosion

DeltaQ Consultants performs internal pipeline inspections by using computerized inspection tools, known as smart pigs, to verify the integrity of pipelines. We utilize various styles of smart inspection tools to assess pipelines and ensure that they can be operated in a safe and efficient manner. The smart pigs inspect the pipelines for corrosion, dents, and other conditions or restrictions in the pipeline that may affect safe pipeline operation. The data obtained from the smart tool inspections is utilized to develop a program of maintenance and repair activities. On board odometers on the smart tools provide location information on where to excavate and investigate potential repair areas.

External Corrosion

DeltaQ Consultants:

External Corrosion Direct Assessment (ECDA) is a structured process used to evaluate buried onshore ferrous pipeline integrity. The ECDA goal is to enhance safety by managing the risk of pipeline corrosion failures while minimizing the cost required for excavations and repairs. ECDA may also be used when more established methods such as in-line inspection and pressure testing are not possible or not practical.

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