Product Overview

SPR® is a spiral wound trenchless pipeline renewal process designed for the rehabilitation of large diameter pipelines up to 5500 mm (220 inch). SPR® utilizes steel reinforced interlocking PVC profile strips grouted in place with a high strength grout. The installation equipment can be utilized via standard access points without site excavation. The Japanese SPR® technology can also be installed in vertical applications such as wet wells, access shafts and other large diameter structures.

The SPR® process is unique as it can provide a customized structural solution to aging pipelines. It can be engineered to correct hydraulic anomalies as well as restore the slope of the original pipe.

The interlocking edges of the profile create an impermeable mechanical lock that can withstand strong deformational forces. SPR® liners have been tested in accordance with industry standards and meet or exceed the standards for machine spiral-wound liners, ASTM F1697 and ASTM F1741. It is also DIBt approved.

Spiral 06

Features and Benefits

Flow advantages
  • Flow efficient, smooth bore cross section.
  • No ripples or wrinkles even when host pipe joints are offset.
  • Winds smoothly around large radius pipeline bends.
  • Can offer greater hydraulic capacity than the host pipe.
A strong lining solution
  • Designed as a structural liner. A range of profiles with varying steel reinforcement is available to meet design requirements.
  • Structurally efficient cross section – even when the host pipe is misaligned.
  • No heating, stress cracking, shrinkage or stretching.
  • Machine installed. Installation does not depend on the standard of workmanship in difficult conditions.
Fast installation with minimum community disruption
  • Rapid set up, safe work sites and low noise during construction.
  • Uses existing access chambers. No need to excavate launch pits.
  • No on-site pipe storage required.
  • Small support vehicles – less disruption of traffic.
  • Can operate with some flow in the existing pipe.
  • Installation possible from difficult to reach access chambers – support vehicles and equipment can be placed remotely.
Proven pipe material
  • Made from a similar grade of PVC as new sewer and drainage pipe.
  • Minimum cell classification of 12344 in accordance with ASTM D 1784.
  • Profile sealing materials are tested to confirm suitability in high ambient temperature sewer environments.
  • Factory manufactured, with consistent material properties.

Process Overview

Installation process – minimal impact on the environment

Inspection and Calibration: Prior to the SPR® winding process the host pipe is inspected and cleaned. Then a 3D Laserscan measures the exact cross section which allows to design the optimal SPR® liner.

Winding process: SPR® profile is fed through the maintenance hole into the winding machine placed in the host pipe. The winding machine winds the PVC profile to the requested form and interlocks the PVC strips to form a new watertight liner. Due to the forward motion the winding machine moves to the next access chamber.

Bracing system: After the winding process is completed the bracing system is installed. The bracing material is lowered through standard maintenance hole openings. In the next step the bracing system is set up to provide structural support during the grouting process and positions the SPR® liner in the host pipe according to engineering specifications.

Grouting: A special high strength grout is injected into the annular space between the host pipe and the spirally wound PVC profile and cured. After completion the bracing system is dismantled and the rehabilitated pipe is ready for service.

Project Experience

SPR® has been used to rehabilitate sewers, stormwater lines and culverts around the world. It has been proven capable of providing a structural liner for severely deteriorated pipelines, and has been installed under difficult site conditions with minimal community disruption.