2025 CM3 Verification Digs

To satisfy requirements under its federally mandated Pipeline Integrity Management Program, a large utility client initiated a series of Inline Inspection (ILI) verification digs along a CM3 natural gas pipeline in Penfield, New York. LaBella’s gas integrity team provided inspection oversight at 13 excavation sites along the pipeline as part of the project.

The objective was to validate previously collected ILI data, assess the pipeline’s physical condition, confirm accurate documentation of identified anomalies, and verify that required repairs complied with applicable regulatory standards.

Phase I: Mapping & Mobilization

LaBella utilized available KMZ files, AutoCAD drawings, and GIS overlays to confirm excavation locations, existing line markers, and test stations. Depth of cover assessments were then performed using electromagnetic locating equipment and global positioning system (GPS) survey tools to define excavation limits and support safe, efficient access to the pipeline.

These pre-dig planning activities were guided by best practices outlined in ASME B31.8S and API 1163, which emphasizes accurate anomaly location and excavation planning as critical components of ILI validation.

Phase II: Excavation and Technical Inspection

During excavation activities, LaBella verified that dig dimensions were sufficient to allow proper inspection and remediation of the pipeline. Once exposed, the pipeline underwent a series of detailed technical assessments, including coating condition evaluations, girth weld inspections, and ovality and deformation checks.

Coating condition evaluations consisted of visual inspections to identify disbandment, blistering, and holidays. Coating samples and surrounding soil deposits were collected for laboratory analysis in accordance with NACE SP0502 and ASTM G57. Girth welds were examined for surface defects, with suspected anomalies further evaluated using Non-Destructive Examination (NDE) methods, including Magnetic Particle Testing and Ultrasonic Testing.

Pipe roundness measurements were performed to identify mechanical strain or denting, and results were compared against ILI-reported deformation data. All inspection findings were documented using GPS-enabled field data collectors and integrated into the utility’s assessment management system for traceability and future reference.

Phase III: Oversight and Compliance

Throughout the project, LaBella provided construction oversight and project management support, including leading kickoff and tailboard meetings, preparing daily inspection reports, supervising field coordination meetings, submitting certifications and operator qualifications prior to construction start, and coordinating with all project stakeholders.

This oversight ensured that all work was performed safely, efficiently, and in full compliance with federal, state, and corporate requirements.

Following completion of the excavation phase, LaBella provided the client with a comprehensive suite of deliverables, including field inspection logs and photographic documentation, coating and soil analysis reports, NDE results and weld condition summaries, daily construction reports and QA/QC checklists, and a final ILI verification dig summary report with recommendations.