Complete services portfolio and expertise enable customer-driven results
When infrastructure project stakeholders seek a dependable and all-inclusive rehabilitation services provider, National Underground Group has proven to be the ideal choice. Our company’s track record of expertise and extensive range of technologies make us a trusted partner. We understand the importance of tailoring our services to meet each client’s unique goals and budgetary considerations. By working closely with our clients, we develop customized designs that align precisely with their specific requirements. Our integrated planning and communication approach creates a collaborative environment, allowing us to thoroughly assess projects, provide informed recommendations, and ultimately deliver the desired results efficiently, without unnecessary delays or workovers. With National Underground Group, clients can be confident that their infrastructure rehabilitation needs are met with precision and satisfaction.
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.
The CIPP sewer pipe and storm drain rehabilitation system offers some unique advantages:
- Unassisted structural strength
- Infiltration prevention
- Comprehensive quality control
- Custom engineered, conforms to host pipe functionality
- Terra Verde non-VOC resin available
Proven processes and technologies ensure complete relining rehabilitation
National Underground Group also offers glass reinforced pipe (GRP) relining. This method entails completely relining sanitary sewer and stormwater pipe/culverts using a thermosetting, resin-impregnated flexible tube that is inflated and cured with hot water or steam.
During research and development, National Underground Group worked closely with Applied Felts to deliver fiberglass strength with traditional felt liner installation methods. This exclusive technology fully integrates and blends the unique properties of each, providing the strongest, most durable liner on the market and offers some key advantages:
- Superior physical and mechanical properties
- Matrix-reducing liner available for large diameter liners
- Lighter weight makes transportation, handling and installation more efficient
Custom repairs target specific sections of damaged pipe to save time and money
National Underground Group’s fiberglass CIPP sectional liners provide an isolated structural repair by only lining the pipe sections that are damaged. This alleviates contractors from excavating or lining entire pipelines. Sectional liners can be used to repair 6- to 24-inch diameter pipe and are available in 24-inch and 48-inch lengths. These liners offer some unique benefits:
- Can be installed back-to-back for longer repairs
- Consist of a fiberglass-reinforced liner and ambient-cured resins
- Stop root intrusion, infiltration/exfiltration and bridge missing sections of pipe
- Enable multiple liner installations often within a day
- Cure despite contact with water
For more demanding single-location pipe repairs, we offer our mechanical point repair solution. It uses a circular component comprised of a stainless-steel structural core with a rubber outer layer, which is inserted inside the damaged pipe section. A mechanical lock holds the component permanently in place against the wall of the host pipe. The mechanical point repair method provides several advantages:
- Restores structural strength of host pipe
- Extends service life of sanitary and storm sewer pipe
- Replaces damaged or missing pipe sections with new pipe
- Secures misaligned and offset joints
- Seals abandoned service connections completely, preventing infiltration
Service Lines
Tri-State Utilities
Tri-State Utilities provides turnkey pipeline rehabilitation solutions and utilizes industry-leading trenchless pipe lining technologies, including the cured-in-place-pipe (CIPP) lining method, on sanitary sewers and storm drains. Customers trust Tri-State Utilities for its in-depth expertise, local knowledge, faster response time, quality assurance and cost-efficiency.
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Tri-State Utilities provides turnkey pipeline rehabilitation solutions and utilizes industry-leading trenchless pipe lining technologies, including the cured-in-place-pipe (CIPP) lining method, on sanitary sewers and storm drains. Customers trust Tri-State Utilities for its in-depth expertise, local knowledge, faster response time, quality assurance and cost-efficiency.
Go to Tri-State Utilities Go to Tri-State Utilities Go to Tri-State Utilities