A BRUGG GROUP COMPANY
Project
In the French twin municipality of Veigy-Foncenex, a reliable pipe system was to be laid for a biogas plant near Lake Geneva. The biogas site was founded five years ago, and a new building was added in 2023. A local heating pipeline with our FLEXSTAR UNO pipes was installed to ensure a flawless energy supply for the new part of the building.
Execution
Two rings of FLEXSTAR UNO, each 200 metres long, were supplied and laid for this construction project. The aim was to connect the pre-pit of the biogas plant with the boiler room. The construction work took a total of two months, whereby the actual laying of the pipes was completed within two days.
The most important construction stages were the construction of a new building and the laying of the pipes under the floor slab. In the first stage, the pipes were laid in the new building before the concrete slab was poured. The next stage involved laying the trench to the boiler room. Thanks to the good weather and the easy handling of the FLEXSTAR pipes, the installation was simple and uncomplicated. Now the biogas plant can supply the region even better with renewable energy in the future.
Project
An innovative district heating project was completed for Centro Manutenzioni in San Bernardino in the canton of Grisons. The project consisted of the installation of CALPEX and CASAFLEX lines to supply the new fire brigade building with sustainable energy.
Execution
The construction work started in September 2024 and was carried out in several stages.
The CALPEX PUR-KING was laid in dimensions 75+75/202 (DN 65) and 63+63/182 (DN 50) over a length of 48 metres. These CALPEX lines are responsible for supplying the building with heat, hot water and cooling air by two heat pumps.
The CASAFLEX UNO, with a length of 86 metres and dimension DN 65, was used for the regeneration of probes that are heated by solar collectors. These probes were specially designed for the use of renewable energies. One of the greatest challenges of this project was the precise coordination of the installation work due to the demanding topography and the specific requirements of the solar collectors and heat pumps. Thanks to the close collaboration with the engineering office and the partners involved, it was possible to complete the project on schedule.
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Project
We laid 250 metres of our CALPEX PUR-KING pipe in a door-to-door connection for the new building site of the primary school in Mettmenstetten, Switzerland. Thanks to its excellent capacity for insulation, the pipe is an optimal solution for both local and district heating applications, ensuring an efficient and low-loss supply of heat.
Execution
The construction site was located on the school grounds in Mettmenstetten and included the laying of a CALPEX DUO pipe for the heat supply. The main challenge was to safely pull in the 250 metre-long pipe in one piece and with five successive bending radii without damaging it. Our new caterpillar winch proved extremely useful here. Its flexibility meant it could be moved anywhere it was needed, making it possible to pull in at the optimum angle.
We also put great emphasis on the safety of the schoolchildren and made sure that no unauthorised persons entered the danger zone. Our specialists carefully aligned the cables and saw to it that everything was optimally connected. Thanks to the high insulation performance and durability of the CALPEX PUR-KING, we were able to install an energy-efficient system that will reliably supply the future building with heat.
Despite all the conditions as well as ongoing school operations, the laying work went smoothly thanks to our experienced team.
Project
We installed our highest-quality PEX pipe system CALPEX PUR-KING in the Swiss municipality of Lostorf for our customer, the building technology association suissetec. Together with our partner, we installed a district heating network with the best thermal insulation, which now connects the existing local heating network with the new building.
Execution
The construction site took place at the suissetec Campus, the suissetec training centre, on Grundstrasse in Lostorf. We installed a total of four pipes for the new building. We installed two pipes each for the flow and return of the district heating network in the dimension DN 100 with an inner diameter of 110 mm and an outer diameter of 202 mm.
The coordination between logistics and assembly went smoothly and without any loss of working time, despite two drums. While the first drum was being delivered and unwound, the transport lorry drove back to Kleindöttingen to pick up the second load. Meanwhile, our fitters aligned the pipes in the trench and prepared the house connections. The second drum was then delivered, the pipes unloaded, aligned in the trench, connected to the existing pipes and insulated.
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Project
In the Swiss municipality of Aeugst on Albis, we installed our highly insulated CALPEX PUR-KING pipe system for the Götschihof energy network. Together with our partner Builcon Energie AG, we installed an efficient district heating network for the future operation of the local energy systems and residential properties of the Swiss National Donation and the Solvita Foundation's residential home.
Execution
An energy network will be created at Götschihof. This will consist of a biogas plant, a combined heat and power plant, several photovoltaic systems and a wood chip heating system. We constructed the necessary district heating pipeline in rural Aeugstertal to connect these individual energy generators.
Our fitters laid four CALPEX PUR-KING pipes in the shortest possible time. The dimensions installed were DN 40, DN 50, DN 63 and DN 68. The longest section was 113 metres from the woodchip heating system to the second-largest heat distributor with photovoltaic system. Another shorter pipe was installed between the two almost completed photovoltaic systems. Our team then successfully installed four house entry bends under the floor slab in the new central building.
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Project
In the canton of Basel-Stadt, an efficient pipe was laid in the village of Riehen for the Fondation Beyeler, the internationally renowned museum of modern and contemporary art. Our best-insulated CALPEX pipe was used to supply the new museum building with district heating and cooling in the future.
Execution
Construction work began in November 2023 and extended over three stages. A total CALPEX pipe length of approx. 800 metres was installed in the project. The aim of the work was to connect the new museum building with the pavilion and connect it to an existing district heating network. A special feature of the project was the production of a special part. This was a ventilation system, which was agreed with the customer before construction work began and installed accordingly. During the construction work, the customised part had to be slightly adjusted on site by the regional welder.
One of the biggest challenges in the CALPEX project, in addition to the complex construction of the customised product, was the terrain next to the new museum building. In order to protect the large old trees, the pipes had to be laid carefully in the trench - which our fitters mastered in exemplary fashion.
Project
In the municipality of Attiswill in Bern, three apartment buildings were linked together in a heating network. The members of the community supply the raw material for the central heating system themselves – wood from the nearby community forest.
Challenge
As the topping-out ceremony for the building was imminent, the CALPEX pipe had to be laid at temperatures around freezing point. Additional measures, such as pre-heating the CALPEX pipe, helped with ensuring that the pipe could be installed without any problems. Now that the CALPEX pipe has been laid successfully, Rolf Steffen, team leader at Alpiq AG, is very much satisfied. “The project showed how cooperation between the installer, Meier Tobler and Brugg Rohrsystem AG worked from the planning phase right through to the execution phase. That’s exactly how I picture team work.”
Project
For our customer Lauber IWISA, we laid 70 meters of CASAFLEX CFL 60+60/162 in Chinnumatta, Grächen, at over 1,600 meters above sea level. With this installation, we were able to ensure a reliable and efficient heat supply under extreme conditions.
Execution
The installation took place in an extremely steep terrain, which placed high demands on the technology and the team. Thanks to our new caterpillar winch, it was possible to place the lines precisely and safely despite all the adversities.
The flexible and robust construction of the CASAFLEX pipe system further facilitated installation and minimized the risk of damage, even under difficult conditions.
The project was implemented in close coordination with our customer Lauber IWISA. Our team mastered the logistical challenges through careful planning and the use of the latest technology.
Despite the demanding environment, the installation was completed on time and to the full satisfaction of the customer. The new line now ensures a sustainable and low-loss heat supply at this altitude
Read more about the project here.
Project
We installed a district heating pipe through the village street for the heating network of the Swiss municipality of Kirchleerau. Our flexible and cost-effective CASAFLEX pipe system was used in several stages of construction to connect surrounding houses to the existing heating network.
Execution
We installed a 1.8 km-long district heating pipe for our customer in several stages of construction. The energy comes from a central wood chip incineration plant. Our versatile CASAFLEX pipes and specially developed moulded parts were installed for the long routes and narrow house connections.
The restricted space on site was not an obstacle for us. The pipes could be easily unwound from the drum and aligned in the trench.
Project
For the world-famous Swiss municipality of St. Moritz, we installed a connecting line in a quick night operation. Our flexible and cost-effective CASAFLEX pipe was successfully installed between the Scala cinema and the Kulm Hotel, which has a heat generator.
Execution
Since the road could not be closed during the day, the installation had to be moved to the night. From 8:00 PM to 2:00 AM, our installers were actively working in the trench and laid the CASAFLEX pipe in record time.
After installation, the trench was immediately closed so that the road could be reopened to traffic the next day.
Projekt
Our technicians installed an efficient district heating pipe in the old town of Zofingen for our customer StWZ Energie AG.
By 2024, several house connections will be connected to the existing heating network and put into operation using our reliable CASAFLEX and PREMANT pipe systems.
Execution
The kick-off for this extensive construction project in Zofingen took place in 2023. The first step was to install our rigid PREMANT and flexible CASAFLEX DUO pipes in the narrow streets of the old town.
Due to the nature of the streets, additional moulded parts were developed and installed in the trench at the request of the customer.
In spite of the spatial hurdles, the construction project has progressed successfully in the historic surroundings thanks to our expert technicians.
Project
For the client Hans Brun AG, our installers implemented an efficient district heating pipeline in the Swiss municipality of Bassersdorf in September 2023.
In seven construction phases, our flexible CASAFLEX and rigid PREMANT pipe systems were used to connect a residential area with several highrise buildings to an existing heating.
Execution
Within six weeks, we installed a district heating pipeline for 14 highrise buildings for the client. Given the limited time available for this project, we are particularly proud that our installers were able to complete all pipe installations within the allotted timeframe successfully.
Our PREMANT pipes were used for long, straight sections, while our CASAFLEX pipes were used for house connections. The tight space constraints onsite did not pose an obstacle. With skill and experience, our team overcame these challenges, allowing the pipes to be easily uncoiled from the drum and aligned in the trench.
Project
In Carona, a small village in the popular Swiss canton of Ticino, an extensive district heating pipeline was laid from the heating plant to the centre of the village. Our reliable PREMANT UNO and CASAFLEX DUO pipes were used to optimise the supply of heat energy to the residents.
Execution
The main heating network for Carona was built twelve years ago. Over the years, it has been repeatedly extended and expanded. In the course of these expansions, the largest construction phase was completed in 2019. We laid an extensive district heating pipeline from the heating centre to the village centre. Our rigid PREMANT UNO pipe was used for the straight pipeline. The flexible and bendable CASAFLEX DUO pipe, on the other hand, was mainly used in the centre of the village.
The biggest challenge on site was the limited space in the old town centre. As the streets were not passable by lorry, our fitters parked the lorry outside the village centre and then pulled the CASAFLEX pipe over the winding streets to the trench. The laying of the pipes themselves has been a complete success so far.
Project
In the diverse Swiss municipality of Sachseln, a district heating pipeline was laid near Lake Sarnersee for the local heating network. Our efficient CASAFLEX and PREMANT DUO pipes were used for the Flüelistrasse to ensure that the residents are supplied with sustainable energy in the future.
Execution
Construction work began in March 2023 and is still ongoing, as the construction project is part of a larger heating network. As a pipe constructor, we have already realised several projects for the customer together with the engineering office. The aim of this project was to connect Flüelistrasse to an existing district heating network. The energy released for the district heating pipeline is obtained from the combustion of wood chips.
As the Flüelistrasse connects the village of Sachseln with Flüeli-Ranft and the pilgrimage site there, it was important to minimise damage to the road. Our CASAFLEX and PREMANT DUO pipes have two inner pipes of the same size for the flow and return of thermal energy. As only one pipe was required per line instead of two, our fitters were efficient when laying the pipes. The biggest challenge in the construction project was installing the pipe at the Salzbrunnen bridge. Because the pipeline could not be installed above or below the bridge, it was necessary to attach it to the side of the Salzbrunnen bridge with special fastenings.
Project
In the popular sports and recreation centre in Bürglen, a reliable and robust local heating pipeline from BRUGG Pipes was laid for Klausenstrasse for the local community. Our perfectly matched CASAFLEX and PREMANT pipes were used in this project to provide residents with a reliable supply of sustainable energy in the future.
Realisation
Construction work began in March 2023 and lasted until July 2023. The aim was to lay a local heating pipeline for the school building and the surrounding residential buildings. The flexible CASAFLEX and the rigid PREMANT pipe system were used in several construction stages. In total, the fitters installed a route length of 400 metres during this construction phase. Approx. 1,700 metres are planned for the final expansion.
Important steps in this project included parking the lorry with the material, pulling and aligning the pipe in the trench and fitting the couplings. Our resistant PREMANT pipes were used for the transport line and the flexible CASAFLEX pipes were used for the house connections. A considerable challenge in the project was laying the pipeline from the power station up the steep mountainside to the main road. Despite the demanding gradient on site, our fitters mastered the individual construction stages with aplomb.
Project
In the foothills of the Swiss Alps, the municipality of Rothenthurm has decided to install a district heating pipeline. Many public and private buildings in the town are to be heated sustainably with a central heat source. Our compatible CASAFLEX and PREMANT pipes were used to provide the residents with an optimum energy supply in the future.
Realisation
The construction project started in summer 2019 and involved laying a total length of up to six kilometres. Not only existing buildings, but also new flats will be connected to the heating network. Our rigid PREMANT pipes were used for long and straight sections. Flexible CASAFLEX pipes were used for the house connections.
In the first construction phase, the district heating pipeline was built from the new heating centre to the primary school building. The energy for the heating centre is supplied by an enormous wood boiler, in which heat is generated by burning wood chips and transported to the buildings through our pipes.
When carrying out the project, the trench along the roads had to be cleared in such a way that it caused as little disruption to road traffic as possible. Another challenge for the workers on the project was the electrical and water pipes already laid in the ground. The altitude of the construction site posed an additional challenge in winter, as the construction pits had to be kept clear of snow.
Project
For our client Sebastian Müller AG, we ensured reliable heat supply for the production facility in the Bohler industrial area of Rickenbach, in collaboration with our partners. In several construction phases, multiple FLEXWELL-FHK pipes and two CASAFLEX pipe systems were installed to guarantee a sustainable energy supply for the company.
Execution
Our FLEXWELL-FHK and CASAFLEX pipes were installed with six under-pressures along Bohlerstrasse to connect the chamber heating OMAG1 with the SOWAR substation and the gravel silo, integrating them into an existing heating network. Thanks to these under-pressures, numerous existing lines posed no obstacle. This technique allowed our installers to optimally route and lay the pipes even under multiple buildings.
Product Advantages
The FLEXWELL-FHK stands out for its robustness and double-walled steel jacket, providing excellent corrosion resistance. Ideal for transporting various media, it withstands high temperatures and loads. The CASAFLEX pipe is flexible, capable of handling tight bending radii and circumventing obstacles. It withstands temperatures up to 160 °C and is suitable for house connections or supply lines in district and local heating networks.
Key to Success
The exceptional collaboration with our partners, particularly Stalder + Birrer AG (Reto Reinhard) as the installer and JOP Josef Ottiger + Partner AG (Daniel Höltschi) as the engineer, was crucial for the success of the project.
Project
We have successfully completed the expansion of the district heating network for our customer EBL (Genossenschaft Elektra Baselland) in the Swiss capital of Bern. With our extremely heavy-duty FLEXWELL DHC district heating pipeline, we have completed a crucial construction phase. Namely the connection between the municipality of Ittigen and the city of Bern. Our pipes were laid under the River Aare to supply the Worblental heating network with sustainable heat in the future.
Execution
The project began immediately after Easter with the delivery of two of our FLEXWELL DHC pipes in the largest available dimension DN 150, which weighed an impressive 7.5 tons per pipe. With a casing diameter of 310 millimetres, a pipe length of 226 meters each was transported to Bern on two drums. Thanks to the use of a special transport with extra width, the pipes were also transported over narrow stretches of land.
The construction site was managed thanks to the use of heavy machinery and six experienced fitters. A special mobile crane with a lifting capacity of 130 tons was used to unload the pipes. Another 60-tonne pneumatic crane lifted the drums into the pipe-laying trolley. Two of the FLEXWELL DHC district heating pipes were pulled from the starting trench on Arastrasse in Ittigen into the empty pipes and laid from there under the river up to Tiefenaustrasse in Bern using cable winches.
Project
For the Alfred Wegener Institute (AWI), which operates the ‘Neumayer Station III’ research station in the Antarctic, we supplied a customised replacement pipeline for wastewater disposal in the ice field. The station, which has been the base for German Antarctic research since 2009, is a place where researchers live and work all year round. The heated, insulated flexible pipe system was specially adapted to the extreme climatic conditions on site to ensure reliable functionality. A flawless infrastructure is essential for Neumayer Station III in order to maintain research operations and supplies under these exceptional conditions.
Execution
The requirements included a 50 metre long FLEXWELL FHK 127/220 pipe system with two redundant heating wires, which were wound helically around the carrier pipe. To ensure a constant heating output, the pipe was equipped with a controller that limits the heating output to 30 watts per metre. Due to the extreme temperatures and the environment, the carrier pipe and all external components were made of stainless steel. At the end of the pipe, a welded AV was integrated with additional sealing using a shrink hose.
The customer had specific requirements for the order:
- Delivery on a disposable wooden drum
- Provision of a bending machine for at least one year
The pipe was delivered on schedule at the beginning of August and corresponds exactly to the technical specifications of the system originally used in 2007.
Our flexible manufacturing process enabled the pipe to be produced and delivered quickly so that it could be transported to Antarctica on time.
Result
The customised replacement pipeline ensures the continuation of treated wastewater disposal at Neumayer Station III under extreme conditions. The Antarctic is a fascinating but also hostile place. Without the right equipment, the icy desert can be deadly. At the same time, it offers data treasures that make a decisive contribution to a better understanding of our planet
The redundant heating of the pipe and high-quality materials ensure long-term, trouble-free utilisation. The project once again demonstrates our expertise in the development and delivery of specialised solutions for demanding applications worldwide.
Project
The Burgergemeinde and the municipality of Lengnau in the Swiss canton of Bern are focussing on ecological and economical heating with their joint heating network called WärmeLengnau - with the aim of producing heat sustainably. Our durable FLEXWELL DHC steel casing pipe system was used in Moosstrasse to ensure that the town is optimally supplied with heat energy.
Execution
Since 2020, many new district heating pipes from BRUGG Pipes have already been reliably laid for the construction projects of the heating network in Lengnau. In September 2023, a district heating pipe was installed in Moosstrasse as part of these construction projects. The aim was to connect the flexible steel casing pipe to an existing heating centre in the shortest possible time so that public traffic was affected as little as possible.
The short time frame was a considerable challenge for our fitters on site, especially as a total of two FLEXWELL DHC pipes, each 134 metres long, were to be laid. Due to the time constraints, our workers had to unwind the pipes from the reel, straighten them, pull them into the trench and align them particularly quickly and efficiently. As the trench was very close to the road, it was also important to work extremely carefully within the cordoned-off areas when laying the pipes. Another challenge was finding the space for the bogie and ensuring access for the lorry with the drum. Despite the challenges, the installation went smoothly thanks to the hard work of our fitters.
Project
In Zurich, the city with the highest population in Switzerland, a flexible and resistant district heating pipe from BRUGG Pipes was laid for Nürenbergstrasse under narrow conditions. Our FLEXWELL DHC steel casing pipe system was used to provide the residents of the building block with an optimum and sustainable supply of heat.
Execution
The construction project began in September 2023. The aim was to connect the flexible steel casing pipe to an existing pipeline and connect it to the building. The construction work took just three days, with the most important steps being the challenging pulling of the pipe into the trench and the pipe laying itself. Two FLEXWELL DHC pipes were used for this project. As the trench was close to a garden plot, it was important to lay the pipe extremely carefully.
At the construction site, there was hardly any parking space on Nürenbergstrasse for the lorry carrying the material, which is why the workers parked the lorry on the other road and then pulled the pipe across a green area to the trench. Another challenge was that no tractor unit could be used for digging. The fitters on site therefore worked increasingly with deflection pulleys to align the pipes underground and master the narrow bends - which they did perfectly.
Project
Insulated pipe systems at the Swiss Museum of Transport
At Switzerland’s largest and most famous museum – the Swiss Museum of Transport located directly on Lake Lucerne – BRUGG Pipes collaborated on an amazing project together with Energie Wasser Luzern (ewl) in March 2022. The district heating and cooling lines connect the new energy centre of the new “House of Energy” multi-purpose building to the existing exhibition buildings through the outdoor area.
Execution
Use of lake water as a modern and ecological source of heating and cooling in Lucerne.
The system is located in the outdoor area of the museum, which is also open to visitors, so fast and efficient execution of the project was of utmost importance and central for all involved parties. Thanks to detailed project planning and coordination, the project went smoothly and was completed on schedule. Installation was carried out by our own installation team to the complete satisfaction of the customer.
A special feature of this project was that the lake water in the immediate vicinity was used as an energy source and distributed with a heat pump. The lake has large heat and cold reserves that can be used ecologically. This is an inexpensive and renewable source of energy with low investment costs and low maintenance. Thanks to the energy from the lake, the use of fossil fuels can be greatly reduced, thereby minimising CO2 emissions. Since the energy is produced locally, long transport routes are not necessary and the added value stays in the region
Project
For the Masche Clouth project in Cologne, in the form of network densification in Florastraße, BRUGG Pipes supplied 1,400 meters of PREMANT DN 350/500 mm as well as Böhmer-type ball valves DN 250/500 with laterally flanged gearboxes to Rheinenergie Cologne. This construction project serves to reinforce and complete the ring of the existing supply network, thus ensuring a more reliable heat supply in the region.
Execution
The project included the integration of the new lines into an existing DN 250 line, which required precise planning and execution. In particular, the assembly of the demanding molded parts posed a challenge, but thanks to the close cooperation with our partners, the Rohrbau-Arge (consisting of the companies Jansen and Haakshorst) and the civil engineering company Jansen, it was successfully mastered.
Our ball valves and fittings are characterized by their high durability and easy handling, which allowed the installation to be carried out efficiently and without delays. The pictures clearly show how the new line is integrated into the existing network.
With this measure, Rheinenergie Köln has not only increased the security of supply, but also laid the foundation for future network optimizations.
Project
Spectacular setting of a DN 350 siphon in Buchs SG
In October 2024, BRUGG Pipes was part of an extraordinary and unique project in Buchs SG. Together with VfA Buchs, our company installed a new DN 350 pipeline (siphon) beneath Grünaustreet to establish an essential connection for the waste-to-energy plant (KVA).
Execution
The pipeline installation became necessary due to a new construction project along Grünaustreet that obstructed the route of the existing pipeline. An above-ground solution was not feasible due to the lack of bridges and safety concerns. Instead, the pipeline, which supplies a critical heating circuit from the KVA to the distribution shaft at Grünaustreet, was routed underground through the Giessen canal.
Use of advanced lifting technology
To ensure the safe and precise placement of the pipeline, two 35-ton mobile cranes were utilized - a remarkable logistical feat rarely seen at this scale in Switzerland. This lifting solution enabled the seamless positioning of the siphon, even under the challenging conditions of crossing a waterway.
Scope of supply and expertise by BRUGG Pipes
BRUGG Pipes supported the project by supplying PREMANT pipe systems, including post-insulation services with specially designed INDUCON sleeves to ensure maximum tightness and longevity. Additionally, BRUGG Pipes took on the engineering and technical planning to guarantee that all requirements for energy efficiency and operational safety were optimally met.
Project
We installed an extensive district heating pipe between the villages of Altendorf and Pfäffikon SZ in the Löliwald area for our customer Energie Ausserschwyz AG.
Our monitorable and rigid PREMANT pipe system was installed to supply Pfäffikon SZ with heat from the wood-fired power plant in Galgenen.
Execution
A 1.8 km-long section was installed for the project. Our efficient PREMANT pipe with DN 200 D S3 was used for the main line to transport sustainable energy from the wood-fired power plant from one village to the next. To save time, the PREMANT lines were built from two sides. One team started in Pfäffikon and the other in Altendorf.
80% of the construction line was thermally pre-stressed to keep the disturbance to nature as minimal as possible. This meant that almost no expansion pieces needed to be installed.
This was the biggest challenge for the planning as well as the coordination of the construction project. Since both a supply and return line were needed, our technicians installed around 3.6 km of PREMANT pipe for this project.
Project
Near the Swiss municipality of Inwil, we laid our high-quality PREMANT pipes under the river and the motorway in order to provide the residents with an optimum supply of thermal energy in future and to drive forward the extensive expansion of the Ennetsee heating network.
Execution
The construction project went through several stages. Together with the civil engineering department and the pipe installer, we expanded the 2.5-kilometre section. The energy for the heat supply comes from the Perlen waste incineration plant. The special feature of the construction site was that there was a section where the PREMANT pipes had to be laid under the A14 motorway and the Reuss. This was made possible using empty pipes, which were laid 350 metres under the motorway and the river using the flush drilling method. Our pipes were then pulled through these empty conduits, giving them optimum protection from external environmental influences.
In this flush drilling process, two of our DN 250 pipe rods with a length of 16 metres were always transported onto a ramp and then gradually pulled into the empty pipes of the starting pit. The biggest challenge on the construction site was not only the time-consuming pulling of the supply and return pipes into the empty pipes, but also the welding and fitting of the sleeves. After the 16-metre pole had almost disappeared into the ground, the next pole was loaded onto the ramp at the same time. Connecting the two poles together was a challenging job that took over 20 days, especially as only four sleeves with welded seams could be created in one day. However, despite the challenges on site, our fitters successfully mastered these construction sites.
Project
In Bürglen, in the idyllic canton of Uri (Switzerland), a district heating pipeline was laid using our PREMANT plastic casing pipes.
Execution
The approximately 400 meter pipeline is part of a 1,600 m long district heating system that uses heat from environmentally friendly biomass and river water.
District heating at the Baltic Sea beach
The striking white buildings along the Baltic Sea beach are what give Heiligendamm its nickname of the “white town by the sea”. The “string of pearls” of white buildings has been supplied by a newly laid district heating line since 2017. Both old and new district heating lines run here, for which a total of €1.1 million was invested. The PSP DN 200 pipe was connected to the existing DN 250 plastic casing pipe close to the tracks of the Molli narrow-gauge railway. German Pipe PREMANT pipes and moulded parts were delivered and laid to cover a length of around 250 m.
As usual, there were some other supply lines to cross. In terms of statics, the pipe was measured for 16 bar. It was relatively easy to position the calculated U and Z expanders along Kühlungsborner Straße. Constructed from 1 x 2 m elbows, no installation sleeves were required. PREMANT and FLEXWELL
This situation changed between the spa building and the Grand Hotel. The areas between adjacent buildings and paths were narrow and a different method was required. The water, which is up to 110°C, flows here at a depth of up to 4 m. With the BRUGG district heating cable DHC, this section could be finished using directional drilling and without having to dig up paths, parking areas and lawns. The transition from PREMANT to FLEXWELL is key here. As a result of the 16 bar internal pressure, the expansion force at the ends is approx. 45 kN. To absorb this stress, the subsequent PREMANT pipes and moulded parts were statically measured.
Some of the force is absorbed by the surface friction, which amounts to approx. 4 kN/m. The majority of the counterforce, however, is achieved by means of the side compression of the PSP elbows against the ground. The steel casing of the FLEXWELL district heating cable is also helpful as it applies or transfers some of the counterforce. The third and fourth construction stage ran from the Villa Perle, which was completely reconstructed in 2013, to behind the Hotel Residenz. Another 600 m of FLEXWELL 200/310 pipes were buried, interrupted only by connection points and intersections. Pipes were shut off to establish the connection with the existing PSP pipe. To allow subsequent reconnection, there are six ball valves over an area of just 20 m². The “FWN-Aufrüstung Heiligendamm – 1. bis 4. BA” project (Heiligendamm district heating upgrade – construction stage 1 to 4) shows how an optimum line can be created thanks to the clever planning solution of combining rigid and flexible pipe systems. German Pipe compiled the static calculations. Flow temperature: 110°C
Nominal pressure: PN 16
Task:
A steam pipe was installed between the incinerator and the paper factory. An 836 m intermediate piece could not be laid above ground for visual reasons and the overground pipe used could not be laid in the ground. A solution was required. Requirement: 220°C operating temperature DN 500, output 45 tons/hour
Solution:
A steel casing pipe was laid. A FLEXWELL DN 100 made of 1.4404 steel was used for the condensate return. For the most part, 12 m parts were used for the 836 m stretch. Special parts were required for changes in direction. The flexible DN 100 condensate pipe was able to be laid in one piece between the shafts.
