Turnkey Solutions

Our Sanitary Sewer Evaluation Survey (SSES) field services include several inspection options and field services:

• High-performance pipe cleaning using industry-best combination sewer cleaners that emit high-pressure water to scour pipes and a powerful vacuum to remove debris
• Lateral launch sewer inspection provides assessment of integral pipe types, including mainline and lateral pipes through closed-circuit television (CCTV) images
• Panoramo 360-degree inspection records 100% of pipe interiors with precise digital clarity viewable from any angle, enabling accurate measurements using a data-embedded virtual 3D reader
• LiDAR profiling uses light detection and ranging (LiDAR) provides accurate data enabling proactive repair and replacement of 6- to 60-inch diameter pipe
• Laser profiling performs inspections using a laser light projection ring inside the pipe, creating a digital profile of a pipe as the system’s camera moves through the line
• Sonar profiling emits sound pulses and reflection measurements to provide visual inspection data on pipe deformation, silt and grease accumulation, and offsets and blockages in partially and fully submerged pipes while they are in service
• Smoke testing is performed using controlled and artificially created smoke, forced through pipes with minimal pressure to visually indicate pipe integrity problems and cross connections as it escapes from defects, damage or breaks in the pipe being tested
• Dye testing is performed by introducing non-toxic dye into roof drain leaders, driveway drains or area drains, followed by checking downstream sewer manholes for dyed water to confirm rain or ground entry points into a sanitary sewer system
• Flow studies and night flow isolation studies to develop baseline flow characteristics and determine sources of I/I during weather events

Services are PACP/MACP/LACP-certified by the National Association of Sewer Service Companies (NASSCO).

After thoroughly assessing the condition of the infrastructure that has been inspected and tested, our in-house, engineer-led team will make recommendations that can be implemented through the designed use of proven trenchless methods and technologies. This ensures that the project requirements will be met effectively and efficiently without costly mistakes or delays.

Trenchless repairs eliminate costs incurred with pipeline replacement projects

National Underground Group’s turnkey solutions offer a number of proven trenchless sewer repair methods. All of these methods eliminate the damage, disruption and safety and environmental risks associated with conventional excavation and pipeline repair.

Our cured-in-place-pipe (CIPP) inversion system enables damaged pipes to be relined for continued service. Our CIPP rehabilitation enables trenchless repairs to be made to sewers and storm drains using a CIPP liner. Installed through manholes, this product creates a structural, tight fit, resin-based liner inside of the host pipe. Each liner is custom-engineered and manufactured to meet the requirements of each particular project and is available in 6- to 108-inch diameters.

Before CIPP installation, the host pipe is cleaned and all debris, roots and corrosion byproducts are removed. The flexible CIPP liner is then vacuum impregnated with a thermosetting resin system to ensure a uniform wetout. The CIPP liner is next inverted through the existing manhole or access point and processed by a hydrostatic water column and cured by circulation of hot water, or by means of air pressure and cured by controlled steam.

A new pipe is formed as the CIPP liner cures and hardens within the host pipe. Inspection and testing are performed to make sure the “new” pipe performs as designed, assuming all functions of the host pipe. The pipe-in-pipe solution is solely sustainable. Further, the “new” pipe bears all external loads without the support of the host sewer pipe, providing a complete, structural solution.