PE 100 spiral wound pipes for drinking water structures
Wound pipes made of PE 100 are used very successfully within the FRANK Group for the manufacture of structures for drinking water supply. The production is carried out in the pipe plant in accordance with DIN EN 16961 using modern PE 100 materials that have been approved by the German Institute for Construction Technology (DIBt).
For the wetted area of the drinking water chamber and in the access area of the valve chamber, a blue PE material is homogeneously applied to the inner surface of the wound pipes using a co-extrusion process. The blue raw material type has the necessary approvals in accordance with KTW and DVGW guidelines for drinking water suitability.The outside of the wound pipes is made of UV-resistant black PE 100. The FRANK Group produces wound pipes up to an inside diameter of DN 3500 mm. As for sewage pipes, the static design for buried pipe structures is carried out in accordance with the ATV-DWA A127 guideline.
FTW® drinking water structures of FRANK GmbH
When designing the pipe structures, the respective requirements of the operators are taken into account. Usually, drinking water tanks are designed with 2 water chambers as well as a technical room (slide chamber). The usable volume of drinking water tanks made of wound pipes is in a supply range of approx. 6 m³ to 800 m³. Up to a size of approx. 2 x 40 m³, the structure can be completely prefabricated and delivered to the construction site in one piece - as a so-called “system tank”. In the case of larger tanks or special transport route requirements, delivery is made in individual parts (prefabricated tanks), which are then assembled and welded on site by DVS- and DVVGW-certified specialist welders. This means that in areas that are difficult to access, a drinking water reservoir can be delivered in individual components and assembled and tightly welded within a few days. All system-relevant components are prepared in advance to such an extent that completion and final assembly on the construction site can be carried out without any problems. For example, a drinking water tank for the water supply of a mountain hotel in the alpine region (municipality of Aschau - Kampenwand) was prefabricated to such an extent that the individual parts were adapted to the load-bearing capacity of the helicopter.
The location of the tank on the Kampenwand in Chiemgau is at an altitude of about 1500 m above sea level. In order to ensure a future-proof supply of drinking water for the hut and the mountain station of the Kampenwand cable car, an FTW® drinking water tank (storage pipe with connected service chamber) made of PE 100 was installed approx. 70 m above the mountain pasture.
Since the installation site is located in alpine terrain, it was necessary to use a cargo helicopter as a means of transport for the last kilometer. The load capacity of the available helicopter of approx. 3.0 tons determined the size of the individual components and 3 prefabricated individual parts were delivered and flown to the installation site. There, at the height of the top station, the system components were assembled and the complete structure was tightly welded together with the support of FRANK specialist personnel and a specialist construction company. After successful assembly, the complete FTW® drinking water reservoir with service chamber was installed and covered professionally in accordance with the relevant static boundary conditions.The basic design of drinking water structures in Germany is regulated by the DVGW. Code of Practice W 300 (Parts 1 - 6) describes the design, static calculation, operation and cleaning as well as necessary construction details. These system-relevant details are taken into account in the design of the structures - planning is carried out with the aid of 3D CAD systems in the FRANK Group.
The structures are already provided with essential equipment elements in the factory - e.g.:
• pipelines with fittings for inlet, outlet, ventilation, drainage
• object protection door, underwater entrance, air filter, lighting
• Optional flow measurement, pressure boosting, turbidity measurement, etc.
Drinking water structures made of PE100 have clear advantages over other materials:
• Durable and permanently tight due to homogeneous, material-locked welding
• Service life according to DIN 8074 / 75 <100 years!!!
• Manufactured in the factory from materials approved for use in the drinking water sector - thus no costly
quality assurance on the construction site necessary
• Low weight - therefore also transport by helicopter possible
• By using PE also as material for the piping inside the valve chamber, no material transitions are necessary
• PE is 100 % recyclable at the end of its service life and does not have to be disposed of as hazardous waste (like
e.g. GRP), which is expensive and time- consuming.
In summary, it can be stated that PE 100 wound pipes are an ideal basis for the production of pipe structures for drinking water supply. In particular, drinking water tanks with smaller and medium volumes (up to approx. 1000 m³) can be manufactured economically for permanent use.