TDG Environmental is New Zealand’s leading trenchless pipeline renewal company.
We offer the full suite of trenchless pipeline solutions from full network upgrades to one off pipeline repairs. We specialise in Fold and Form UPVC lining and UV Cured CIPP Lining options.Request a quote
We cover the full spectrum of pipelines from 100mm through to large diameter pipelines in excess of 2500mm.
Whether it is a large pipe displacement, cracks and fractures, concrete slurry ingress or an intruding connection it can be repaired. Trenchless pipeline rehabilitation provides our clientele with an innovative and cost-effective option for repairing pipe defects at a fraction of the cost of excavation and open cut replacement. Using state of the art technologies, we can help customers and clients reduce costs substantially, providing reliable services and extreme value.
Trenchless technology in pipeline renewal projects minimises the disruption to the public through smaller work sites.
Our UV Liners are extremely strong, carbon fibre reinforced and are also very thin when compared to all other liner options available on the market.
TDG is New Zealand’s leading trenchless pipeline renewal company. We offer the full suite of trenchless pipeline solutions
Our operators are trained and competent to ensure all works are carried out in an efficient and responsible manner complying with industry standards.
Fold and Form Lining
The advantage of trenchless technology in pipeline renewal projects is the social economic savings it provides by minimising the disruption to the public through smaller work sites, less temporary works, and less time on site. For Example: A typical manhole to manhole installation within a carriageway is roughly 3-5 hours to complete the installation. Fold and Form UPVC is a pipe lining method that involves winching a specially formulated and softened PVC pipe into the pipe through the existing access chambers. Injectors are fitted to each end of the Ex-pipe and steam and pressure are applied to expand the lining. The pipe then forms a tight-fitting structural liner within the existing host pipe.
UV Liners are extremely strong, carbon fibre reinforced and are also very thin when compared to all other liner options available on the market. UV Liners display superior strength properties without impacting on the internal diameter of the host pipeline when minimised in any reduction in flow capacity. Hydraulic capacity is increased with the new seamless/ jointless liner allowing for a reduced Mannings number and subsequently increased hydraulic outputs. The liners are pulled place while inside a protective foil. Once in place the liner is inflated with low pressure air to make a tight fit to the existing host pipe. Once at pressure the liner is then cured using a UV light system specifically sized for the nominal pipe diameter. Liners are able to be cured at speeds in excess of 1.0m per minute utilising this technology, this allows us to minimise our site footprints and set-up requirements, subsequently causing less disruption to the public and the surrounding environment. These liners are able to be designed to meet any specific site scenario and are available in a range of resins to meet any requirements from high/low temperatures, high/low PH and any additional elastic properties.
Pressure Main Relining (Sewer/Potable Water)
Through our worldwide connections we are able to source, supply and deliver all options for pressure lining, which can be engineered and tailored to meet your requirements. Our staff are fully trained in the installation process and hold certifications with Pipecore utilising Saertex products. We are able to rehabilitate existing pressure mains and water mains utilising our inhouse equipment of UV curing and robotic cutting systems. We can do this in diameters from 150mm to 1000mm+
Lateral Junction Repairs
TDG uses the latest technology resins and material for lateral junction repairs. The resin provides excellent bonding to materials including PVC, EW, DI and CI. The finished product can withstand water jetting to meet the requirements specified within the Pipe Inspection Manual. Each live house connection is re-opened using a special remote controlled cutting device. This tractor-mounted cutter also incorporates a miniature CCTV camera and is inserted at the manhole and driven up to the location of each live connection. Using the dimple formed and confirmed with measurements, the liner is cut and trimmed back flush and smooth to the full size of the existing opening. An LJR is installed into the cutout to seal the liner to the lateral connection. The LJR is designed to bond with both the host pipe and lateral to form a waterproof seal.
At TDG Environmental we use the latest technology for all our relining service offerings.
Our relining services are innovative and a cost-effective option for repairing pipe defects at a fraction of the cost of excavation and open cut replacement.
For a comprehensive quote on any of our services, or general enquiries, please fill out the form below or contact us.
TDG Environmental is the most experienced provider of sustainable waste and stormwater management solutions throughout Australia and New Zealand specialising in a comprehensive range of environmental services including:
The Utility Track software is designed to offer our clients an effective solution for managing, storing, backing up, and sharing stormwater and sewer data collected during work.read more
Our utility location services give you full visibility of any and all utilities located below ground level with minimal site disturbance.read more
Non-Destructive Digging (NDD)/Hydro excavation is also known as Vacuum Excavation, Potholing, Hydro-Excavation, Hydro-Trenching and Non-Invasive Digging, and is a preferred method of bulk excavation for construction.read more
Pipe and culvert cleaning is the process of removing accumulated materials from pits, pipes and culverts to ensure smooth water flow and prevent blockages.read more
A GPT is a device designed to capture and retain large solid waste and debris. Regular cleaning and maintenance of GPTs are essential to ensure their effectiveness in preventing pollution.read more
We can vacuum large amounts of waste and debris, using a combination of vacuum trucks and vacuum tankers allows us to remove and dispose of waste quickly and efficiently.read more
The internal inspection of an underground pipe using robotic CCTV, and other sensor technology such as sonar and laser, to ensure the conduit has structural integrity and is performing as designed.read more
Repairing or restoring existing pipelines to extend their service life or improve their performance using tried and trusted techniques and technologies.read more
Specialised waste vehicles purpose-built to transport substantial volumes of waste efficiently and safely.read more
Processes to repurpose waste for intergenerational benefit.read more
Our spot spray applicator is designed and built to target areas directly affected by tree root intrusion in your sewer system.read more
Our innovative dredging systems enable the continuous removal of sludge’s, biosolids and other materials water bodies.read more
TDG’s grease trap maintenance service not only cleans your grease traps, but liases with the local water authority, monitors your maintenance schedule and provides 24/7 customer service.read more
Trenchless pipeline rehabilitation provides our clientele with an innovative and cost-effective option for repairing pipe defects at a fraction of the cost of excavation and open cut replacement.read more
TDG conducts smoke testing services as a method in locating illegal stormwater connections and infiltration/exfiltration of sewer assets. TDG offers smoke testing for both mainline and domestic sewer and stormwater services.read more
At TDG Environmental we specialise in the cleaning of household & industrial septic tanks.read more
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