5 Lessons From a Career in Pipeline Condition Assessment and Rehabilitation

One of the most overlooked aspects of condition assessment is cleaning. For large diameter systems, effective cleaning isn’t just about gaining clear camera footage; it’s often the first diagnostic tool. Heavy debris, roots, grease, or sediment buildup can indicate flow restrictions, infiltration, or previous failures.

Another early question we’re often asked is, “Should inspection start upstream or downstream?” The answer: downstream if you can control the flow. Starting downstream ensures that as cleaning and inspection progress, water and debris can be managed effectively without compromising visibility or access.

However, each system is unique. In some cases, upstream access points, site restrictions, or flow diversion constraints force a reversal of this strategy. The key is flexibility, agility, and planning; understanding how to manage flows while ensuring safe, effective access and cleaning operations, and being mindful of how dislodged debris can drift downstream, potentially impacting other pipeline segments or wastewater facilities.

Standardization matters. As a certified National Association of Sewer Service Companies (NASSCO) Pipeline Assessment Certification Program (PACP), Manhole Assessment Certification Program (MACP), and Lateral Assessment Certification Program (LACP) professional, I’ve seen firsthand how consistent defect coding and documentation improve communication between field teams, engineers, contractors, and clients. For large-diameter pipelines, the margin for error is smaller, rehabilitation is expensive, and poor data can lead to costly mistakes. 

NASSCO certification ensures that all defects are assessed and reported using a consistent, industry-accepted methodology. This not only improves decision-making but also supports long-term asset management. 

Large-diameter sewer condition assessments often require a hybrid approach. Selecting the appropriate technology requires careful consideration of infrastructure conditions as well as the pipe’s size, shape, material, and flows. In addition to CCTV and manned entry inspections, I’ve used a range of complementary tools: 

• Laser and sonar profiling to assess pipe ovality and sediment levels. 
• Smoke and dye testing to pinpoint inflow and infiltration sources. 
• Ground-penetrating radar, also known as GPR, near railyards and critical infrastructure. 
• Acoustic inspection as a rapid screening tool for large networks. 
• Pipe diver electromagnetic inspections to detect wire breaks and structural degradation in concrete pressure pipes while the pipeline is in service. 
• Lidar scanning to create high-resolution 3D models of interior pipe surfaces, especially in dry or low-flow conditions. 

Leveraging advanced technology and implementing the right technology is crucial to the success of the condition assessment.  

Condition assessment isn’t just about identifying what’s wrong; it’s about planning for what comes next. Every decision made during assessment impacts rehabilitation’s feasibility, cost, and success.

By integrating cleaning, using the right technologies, adhering to NASSCO standards, and thinking strategically about rehabilitation options like CIPP, we can better protect our infrastructure and serve our communities and the environment.

Are you facing a pipeline condition assessment challenge? Please contact me so that we can help you find safe, cost-effective, and resilient pipeline solutions.