Pipleline Integrity Services

Coast NDE personnel have been actively involved in ILI, ECDA, ICDA and SCCDA programs since the mid '80's. We have the people, training, technology and project management skills to assist clients with their Integrity Management Program.

Pre-Assessment

Historical and current data is collected and analyzed to prioritize the pipeline segments. The segments are analized with respect to SCC, Soils, Drainage for SCC susceptibility and used to select specific sites along the pipeline for Direct Examinations.

Typical data collected would be original installation dates, construction records, historical and current maintenance histories, corrosion survey records, alignment sheets, historical above ground survey data (i.e. CIS, DCVG, Wenner 4-Pin etc), prior pipeline integrity examinations ILI tool data and or repairs and from governmental sources.

The data can be divided into 5 categories: Metallurgical, Construction (as builts), soil/environmental related, corrosion protection (CP systems) and pipeline operations. Specific sites (anomaly dig locations) for Direct Examination should be selected to maximize the detection or probability of locating SCC if it does in fact exist in a pipeline segment. Coast staff are well trained to perform these initial site selections and the preparation of a directly correlatable soils/drainage/topography model profiling your individual and unique pipeline right of way conditions.

Indirect Inspection

Additional data is collected as deemed necessary by the owner/operator to prioritize the selection of s egments and dig site selection. Typical indirect inspection methods utilized are close interval surveys (CIS), direct current voltage gradient (DCVG), alternating current voltage gradient (ACVG), Pipeline Current Mapper (PCM) and C-Scan data. Additional information about the terrain conditions such as soils, topography, drainage etc is also collected.

Direct Inspection

Procedures to field verify selected sites detailed in the initial first two steps are performed and dig programs are initiated. Above ground measurements and inspections are documented. The presence and severity of coating anomalies, corrosion, geometry defects and SCC/linear indications are thereby confirmed. If predictive models are used based on soils, topography, drainage, etc, they will also require verification. Click here for further details

Post Assessment

Data collected from the first three steps is analyzed to determine whether SCC mitigation is required. There are two types of SCC mitigation: discrete and general.