Trelleborg DrainPacker System comes to rescue

Through our distributor SECA, installation contractor Pipe Spy and certified engineer CSDEE Engineering, Trelleborg DrainPacker System comes to the rescue to repair a DN525 FRC stormwater pipe with protruding PVC rainwater connections.

Challenge:

During an off-maintenance CCTV inspection, penetrations were identified from an adjacent new residential property directly in the obvert of the pipe. The extent of the penetration was approximately 1/3 of the pipe diameter, hence in this case these penetrations were approximately 150 millimeters into the stormwater pipe. Obstacles protruding into a pipe can have several implications during a heavy rainstorm such as the following:

1. Increased risk of flooding and damage: When rainwater flows through the pipe, these obstacles can obstruct the flow, causing water to back up and potentially flood the surrounding area. This can lead to property damage and erosion.

2. Pipe blockage and clogging: Debris, leaves, and other materials can accumulate around the obstacles, leading to partial or complete blockage of the pipe. This reduces the pipe’s capacity and may cause backups.

3. Erosion and undermining: Water flowing around obstacles can erode the soil around the pipe, potentially undermining its stability. This can weaken the pipe’s foundation and increase the risk of collapse.

Our activities:

Upon identifying the protruding connections, Pipe Spy was asked to recommend a fast solution to remove the two DN100 protruding PVC connections and upon detailed inspection of the workmanship on installed connections, it was clear that FRC pipe structural integrity was compromised and structural repair was required.

Pipe Spy installed 2 overlapping Trelleborg DrainPacker patch repair liners of 3 layer 1400gsm with 6 millimeter thickness and 600 millimeter repair length to reinstate the structural integrity of the FRC pipe and reopened the rainwater connections.

After months of planning, preparation and comprehensive training, the repair works were executed successfully. The rehabilitation of the pipes took less than three hours, including a curing time of one hour. The liner fit the original pipe seamlessly. The walls of the pipe were clean and water flowed through smoothly without affecting the speed. The renovated pipes now have a service life of 100 years as required by Council for the FRC pipes.

Solution details: Trelleborg DrainPacker

Trelleborg’s trenchless pipe and sewer rehabilitation systems are a practical and cost-effective alternative to traditional pipe rehabilitation methods which require digging and the complete replacement of a pipe or sewer through an open construction site over 3 to 6 months. The Trelleborg DrainPacker system is a sectional or point repair method for all types of wastewater, sewer and drainage pipes. The system uses Trelleborg Silicate Resins and chemically resistant, non-corroding Trelleborg Glass Fiber Mats CRF+. The

Trelleborg DrainPacker method is suitable for the sectional repair of buried, damaged gravity sewer pipes. The process provides structural repair with a frictional fit in the pipes of public and private sewerage systems. Pipe sizes that can be repaired range from DN 35 to DN 1200. Depending on the packer design, Repair lengths range from 0.5 meters to 5 meters. For repair lengths exceeding 5 meters, it is possible to use the Trelleborg DrainPacker method in an overlapping technique. Longer pipe segments need to be repaired from pipe joint to pipe joint. Lateral connections that are no longer in use can be blocked off. This product can be used in the case of heavy infiltration or even under water. The method is applicable to circular and eggshaped pipes made of concrete, asbestos cement, plastic (PVC, PP, HDPE), cast iron, ductile cast iron, fiber reinforced concrete or vitrified clay. The installation was successfully done within a couple of hours and the pipe is reopened afterward to resume its service and function. Hassle free, swift and non disruptive.