SPR®ST
Strong, Large Diameter Pipe Lining
RIBSTEEL®
Product Overview
SPR®ST technology, incorporating the Ribsteel® spirally wound system by RIB LOC®, is a solution for restoring the hydraulic efficiency, reliability and integrity of aging sewers, storm drains and culverts.
Where required for greater stiffness, the liner can be reinforced by simultaneously winding a profiled strip of steel under the tees of the PVC profile.
SPR®ST / Ribsteel® liners can structurally rehabilitate brick, concrete, glass reinforced plastic or corrugated metal sanitary and storm water pipelines with diameters from 450 mm (18 inch) to over 2500 mm (100 inch).
The plastic profile that forms the liner is provided in a range of sizes and thicknesses. The appropriate profile is selected to provide a liner with sufficient stiffness to meet the design requirements for the project. Profiles may be reinforced with steel for high loading applications, maximizing liner stiffness whilst minimizing loss of cross section.
Features and Benefits
Flow advantages
- Diameter can be varied with adjustable winding cages to maximize liner diameter.
- Hydraulically efficient, smooth bore with circular cross section.
- Usually greater hydraulic capacity than the host pipe.
- Winds smoothly around large radius pipeline bends.
A strong flexible liner
- Can be designed as a structural liner. A range of PVC and steel combinations are available to meet design requirements.
- Structurally efficient circular cross section - even when the host pipe is misaligned.
- Constant wall thickness even when negotiating voids in the host pipe.
- Machine installed. Liner 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.
- No need to excavate launch pits or store pipes on-site.
- Oval cages in many cases conform to invert and minimize benching removal.
- Small support vehicles – less disruption of traffic.
- Can operate with some flow in the existing pipe, up to 25% subject to velocity and safety considerations.
- Installation possible from difficult to reach access chambers – support vehicles and equipment can be placed remotely.
Proven pipe material
- Made from similar grade of PVC as new sewer and drainage pipe.
- Cell Classification of 13354 in accordance with ASTM D1784.
- Profile sealing materials are tested to confirm suitability in high ambient temperature sewer environments.
- Factory manufactured, with consistent material properties.
Process overview
Safe work sites and low noise
The deteriorated pipeline is first cleared of debris and obstructions, cleaned and inspected, the diameter measured and then proved.
The SPR®ST / Ribsteel® winding machine is lowered to the base of the access chamber through standard maintenance hole openings. The PVC profile and steel is fed into the machine from above ground spools. The winding machine then winds the PVC profile to form a liner. If required, a continuous strip of steel can be locked under the PVC profile tees by the winding machine.
The process continues until the liner wound by the SPR®ST / Ribsteel® winding machine reaches the end of the pipeline length to be rehabilitated.
The ends of the liner at both access chambers are sealed and rendered to make them smooth with the host pipe.
The annulus between the fixed diameter liner and the host pipe can be filled with cementitious grout immediately after winding is completed.
Project Experience
SPR®ST / Ribsteel® has been used to rehabilitate sewers, stormwater lines and culverts around the world. It has proven capable of providing a structural liner for severely deteriorated pipelines, and has been installed under difficult site conditions with minimal community disruption.
