Across Three Bridges in Vietnam
Jul 12, 2022
The Van Don district in the north-east of Vietnam belongs to the province Quang Ninh, about 150 km east of Hanoi. The province is home to Hạ Long Bay, a World Heritage with 1,969 islands. Three quarters of the province are mountainous and they have abundant land, forest, water and mineral resources.
In this beautiful scenery, network operator Quang Ninh Water Company (QUAWACO) is operating a DN 300 steel water main located underneath and inside a bridge construction to supply Van Don Island with drinking water.
The three single bridges have individual lengths of 410 m, 170 m and 270 m. The pipes were originally installed in 2002 with construction of the bridge. Corrosion and securing the water quality induced the water network operator to a preventative maintenance of these steel pipes.
The goal of the renovation works was to elongate the life span of the pipes and secure the water supply. Because of difficult access and in order to quickly upgrade the existing pipe, the Primus Line® system was the preferred method. It was the first deployment of the Primus Line® system in Vietnam.
In order to install the Primus Line® system, only a small investment in necessary tools was required. In addition, the training for the contractor was performed locally in two working days by a Primus Line instructor. During the same week, the contractor renovated the first bridge under supervision of this instructor. QUAWACO proactively manage the water supply in their region and have reduced the non-revenue water rate below 18% over the past couple of years.
In a first step, the pipe was CCTV inspected to assess the condition of the host pipe. This inspection revealed several areas where incorrect welding seams were protruding into the cross-section of the pipe. The individual pipe shots were butt-welded. Due to the complex accessibility of the steel pipe underneath the bridges and inside a box girder, the welding seams were removed manually.
The contractor performed mechanical cleaning of the host pipe using scrappers and rubber pigs. The 840 m of liner were delivered pre-folded into U-shape on timber transport reels directly to the site. A pulling wire was mounted to the start of the liner and connected to a rotation joint and subsequently to the cable of a pulling winch.
The liner could be installed in less than one hour for each section and was re-rounded using compressed air. The end fittings equipped with DIN flanges PN 10 were mounted. The renovated section was successfully pressure-tested using potable water with 9 bar. The pipe was reintegrated into the network using HDPE pipe shots.
The whole renovation was completed after three weeks and extended the asset’s life by 50 years. Thus, the water quality and supply are secured.
More News and Articles
Aug 11, 2022
News
Harnessing the Benefits of Process Patents
WPL has been granted a patent for its cutting-edge WPL Hybrid-SAFTM process technology. The patented technology employs a submerged moving-bed, fixed-film reactor which can treat wastewater with greater energy efficiency compared to traditional submerged aerated filters (SAFs), in a tighter …
Aug 11, 2022
News
‘Water quality as-a-service’ about more than throwing tech into networks
Awarded more than £700,000 from the Water Breakthrough Challenge Catalyst Stream, Treatment-to-Tap seeks an industry watershed by supplementing a tech rollout with collaborative data analysis and behavioural science to build trust in tap water.
Aug 10, 2022
News
MWH Treatment Wins Severn Trent Framework Contracts
Water sector specialist MWH Treatment has been awarded a place on Severn Trent’s AMP7 (regulatory asset management period 2020-25) framework for both design-and-build and build-only water and wastewater treatment projects. The agreement extends an existing 20-year relationship and MWH Treatment …
Aug 09, 2022
News
Reliable Pipeline Protection with DENSO: New Laying Method in Water
For the rehabilitation of a drinking water pipeline in the district of Aalen, 200 km north-east of Munich, Germany, the DENSO Group Germany protects weld seams from corrosion very quickly and efficiently using a new laying method that floats in …
Aug 08, 2022
News
VARIOKIT Tunnel Formwork Solution Deep in the Heart of the Golden City
With construction work being carried out in depths up to 30 metres in the centre of the city famous for the Golden Gate Bridge, an enormous building structure is being realised. When completed, the Chinatown Subway Station will form the …
Aug 04, 2022
News
The Construction Site Determines the Installation Technology: Light, Steam, Hot Water or Ambient Temperature
Which curing method should ideally be used in the context of rehabilitation projects in building and site drainage? The market for the rehabilitation of building and property drainage is currently developing dynamically. The complexity of construction sites in particular places …
Aug 03, 2022
News
100 Years Lifetime of Polyethylene Pressure Pipe Systems Buried in the Ground for Water and Natural Gas Supply
TEPPFA and PE100+ Association have identified the need for explaining the difference between the design point at 20 degree/50 years and the expected life-time of PE80 and PE100 pressure pipe systems. Research, extrapolation studies and reports on dig-up pipes in …
Aug 02, 2022
News
World's Biggest 'Listening Project' Will Help Save Water
United Utilities is rolling out the biggest “listening” project of its kind in the world in a bid to tackle water leakage. The North West water company is installing around 100,000 ‘acoustic’ loggers over the next two years on its …
Aug 01, 2022
News
Always Moving Forward in Pipeline Technology
A dense pipeline network spanning over three million kilometers is the global backbone of industry and commerce. To keep supply stable, innovative pipeline companies are constantly expanding the network and making it denser even in sparsely populated places. In the …
Jul 29, 2022
News
Using Plastic Pipes for Heating and Cooling Brings Energy Efficiency Gains
Surface heating and cooling using plastic pipes is being highlighted at the moment as it is helping facilitate a greater uptake of renewable heat sources and is proving highly energy-efficient in our increasingly energy-aware climate.
Jul 27, 2022
News
WPL Wins Holiday Park Wastewater Contract
Wastewater treatment specialist WPL has won a contract to provide onsite wastewater treatment at a holiday park in Cornwall. The underground installation at Juliots Well in North Cornwall will replace the existing septic tank and includes a WPL HiPAF (high …
Contact
Rädlinger primus line GmbH
Kammerdorfer Straße 16
93413 Cham
Germany
Phone:
+49 9971 8088-0
Fax:
+49 9971 8088-9999