Pipe Relining - case studies
Location: AMP Building Circular Quay Sydney
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AMP Building at Circular Quay Sydney constructed in 1959/60, was undergoing a major $90 million refurbishment. The plumbing contractor for the refurbishment contacted nuflow as he had found no other system of pipe relining in Australia able to carry out the relining on a project of this magnitude. When nuflow investigated, the site access to the areas to be lined was limited; access to the down pipes was gained from the roof of the AMP Building, after the roof sumps, which had been welded in place, had been removed. It became clear from the start that any repairs required would need to be thoroughly investigated due in part to the access points, the large number of 45 and 90 degree changes in direction and the fact that tenants were using most floors and could not be disturbed. The length of liners required the works to be carried out in two stages. Stage one would start from the 26th floor and stage two would start from the 13th floor. Stage two requires access panels to be cut into the pipes in order for the liners to be inserted. |
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Closed Circuit TV (CCTV) Investigation The CCTV investigation showed the problem as being all four 150mm galvanized down pipes corroding badly. The leak’s that are current and any future ones are of a serious concern and need immediate repair. |
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Result after Reline - Approximately 100's of Thousands Saved Nuflow carried out the following whilst installing another successful reline. Excavation: None |
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Alternatives The savings to reline the down pipes over replacement is substantial and will prove extremely worthwhile in cost, logistics and quality. This project reveals that you have to plan installations very carefully. Careful and investigative planning resulted in a totally different approach to this job and re-enforced the great belief in thorough research and planning before undertaking or quoting on any work. |
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Location: Tugan Bypass - 600mm Storm Water Pipe
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During the construction of the Tugun bypass, water monitoring observed an increase in flow of water through the storm water system even during times of minimum rain fall. Access to view this particular break was gained by physically entering the line via a 15 metre deep, pump out sump 50 metre's up stream of the problem. The timing of access to the line had to be coordinated with the rise and fall of the ocean tides, as the amount of infiltration greatly increased during high tide. Previous attempts to seal the infiltration by using putty and expanding foam have proved unsuccessful due to the water pressure pushing through the gaps. To ensure the reline of this amount of infiltration is successful, it will require a second liner to be installed over the first, doing this will completely seal the problem. |
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Closed Circuit TV (CCTV) Investigation After carrying out the CCTV operations in the pipe we were able to locate the problem as being a major infiltration in a 600mm concrete storm water pipe. Access to the particular problem was gained through a sump pit in an up stream location of the infiltration. |
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Result after Reline - Saving of approximately millions and a 3 month delay on completion
Nuflow carried out the following whilst installing another successful reline. Excavation: None
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Alternatives An alternative to the relining of this project would be to excavate the pipe and renew the damaged section; this would have involved having to effectively plug the area off that was to be excavated to reduce or even stop the flow of water, in order for an external repair to be carried out or a new piece of pipe installed. The downtime on this pipe repair was kept to the minimum by utilising a pump to remove the storm water from the pit up stream of the repair and discharging into the downstream pit, below the repair. |
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Location: Hotel Broadway Woolloongabba
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The Hotels toilets were backing up and during extreme use would overflow. This issue was further compounded as the waste from the main bar entered the same sewer line. Access to the sewer line that required investigation and repair was particularly awkward as it was located in the cellar under the main bar, which was in general use from 9am. The line itself was attached to the floor joists of the bar; this further compounded the point of access as a hole was required to be cut in the top of the line to allow the investigation and clean to be carried out and the liner to be inserted. An access hole was cut in the line and a plug was inserted up stream in order for the works to be carried out. The pre and post photos show different metres form point of entry as they were taken from the upstream and downstream points of entry, this was due to the reduced access in the main bar. |
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Closed Circuit TV (CCTV) Investigation After carrying out the CCTV investigation in the line we were able to locate the problem as being a displaced joint and a length of root intruded 100mm earthen ware sewer line running from the cellar out into the hotel car park. This required water jetting, to clear the line, and the installation of 3 meters of liner in order to repair the displaced joint and seal the areas where roots were protruding |
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Result after Reline - A Saving of $16,000
Nuflow carried out the following whilst installing another successful reline. Excavation: None |
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Alternatives An alternative to the relining of this project would have been to excavate the area and replace the pipe. This would have involved closing the front doors of the hotel for the duration of the repair works, dismantling a large section of the wooden deck at the front of the hotel, excavating a trench from the hotel out into the car park and extracting the existing line from the cellar wall. All of these works would have caused a major disruption to the day to day operations of the hotel and inconvenience to its patrons as it would have in effect closed all the frontage of the hotel. The only inconvenience caused to the hotel during the relining works was limiting the number of amenities that were used during the downtime, whilst its patrons could still enjoy a beverage on the front deck.
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