EDITORS CHOICE
machinery or hoist units on site was a first in France.
To residential buildings in Hong Kong In September 2023, Hong Kong was hit by a century storm, which triggered a landslide in Yiu Tung Estate, Shau Kei Wan, on Hong Kong Island, resulting in the rupture of the main water supply pipes to five buildings. The Hong Kong Housing Department and the Water Supplies Department (WSD) immediately worked to restore water supply to three buildings by 8 September. To speed up the restoration of water supply to the remaining two buildings, the WSD installed an emergency pipeline with a Primus Line® system DN 150 on the road surface to ensure uninterrupted water supply to the residents.
A Primus Line partner in Hong Kong played a key role with products in stock. The installation involved the use of Primus Line® flexible pipe from the pump room to the isolated underground pump room. A coordinated effort restored the water supply to the remaining two buildings by 10 September. The temporary Primus Line® installation was expected to be used for at least six months.
The triple bypass in Messina
ensured the drinking water supply to 240,000 inhabitants.
Primus Line® system was used as an emergency installation. The enormous rise in the water level completely destroyed the main riverbed.
Unimaginable quantities of water caused unprecedented human and material damage: supply networks were interrupted and a bridge collapsed. In order to restore the drinking water supply, the regional supplier had no choice but to install a temporary pipeline hanging freely across the new riverbed. The networks that were still operational were connected by laying the emergency pipeline along a road and a path to reintegrate the cut-off commune of Saint-Martin-Vésubie into the supply network. The regional utility chose a proven solution: the Primus Line® system is suitable for long distances and was also the quickest to install.
With 1,340 metres/4,396 feet to bypass and no lifting equipment on site, the Primus Liner’s light weight of 2.1 kilograms per metre allowed 610 metres/2,000 feet per reel to be transported flat. A further 120 metres/394 feet were delivered folded into a U-shape to be inserted into a PVC pipe suspended over the river at the former site of the collapsed bridge.
Rädlinger Primus Line prepared and shipped the material, i.e. the liner and specially developed connectors, within just 24 hours. The local installation partner executed the work on site. Perfect preparation was key in this case, as all the materials had to be flown in by helicopter. Combined with proactive planning, the quick adaptation to the local conditions and the helicopter support for the daily shuttle service, the bypass was installed and the drinking water supply restored in less than one week.
This project to restore the drinking water supply without heavy 26 | February 2025 |
draintraderltd.com
A month later, the WSD requested the parallel installation of temporary seawater connecting pipelines specifically for toilet flushing. This successful installation received high praise from both the water department and the building occupants, confirming the characteristics and quality of the Primus Line® system.
Triple emergency bypass in Messina, Italy In 2015, heavy rainfall and a subsequent landslide structurally damaged a DN 1000/40- inch steel pipe. This trunk main supplies the city of Messina with drinking water. When an initial repair attempt failed, the city’s 240,000 inhabitants were left without drinking water for more than ten days. The Italian government therefore declared a state of emergency and the military and civil defence took the lead. A local construction company was appointed to remedy this emergency situation quickly and efficiently. The trenchless specialist suggested using the Primus Line® system as a temporary bypass to restore the drinking water supply.
On the day of the order, three sections of DN 300/12-inch Primus Liner with lengths of 350 metres/ 1,148 feet each and six DN 300/12-inch Primus Line connectors with flanges left the Primus Line headquarters. Meanwhile, the local construction company built a site road on the back of a steep mountain to gain access to the damaged water main. A crawler excavator then transported the coiled Primus Line material to the construction site. Due to the height difference of 35 metres/115 feet between the connection points, the liner had to accommodate an operating pressure of 3.5 to 7 bar/50.8 to 101.5 psi. In addition, the last 80 metres/262.5 feet to the lower connection point had o overcome a gradient of 50%. The three Primus Line connectors were attached to the host pipe.
Using a specially designed fitting
The installation of the three sections was completed in just 30 hours. This emergency bypass delivered about 660 litres/174 gallons per second to Messina – equivalent to 57 million litres/15 million gallons per day.
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