In the case of PE pipes, single-layer or multilayer pipes made of PE 100 and PE 100 RC have become well established within the market. Thanks to its increased stress crack resistance, the enhanced material PE 100 RC provides additional safety.
Naturally, PE 100 RC pipes can also be used for open-cut laying in trenches. Their use significantly increases the level of safety. Additionally, it is perfectly acceptable to use pipe gravel with crushed fractions.
Especially in the case of trenchless methods of laying, pipes with a protective jacket are used, or even as a combination in the form of a containment pipe and a media pipe. The protective-jacket pipe SIMONA® PE 100 SPC RC-Line is a high-end product that meets the applicable requirements for the material PE 100 RC in accordance with PAS 1075 and thus provides a recognised standard of quality.
- Heated-tool butt welding
- Electrofusion welding
- SIMOFUSE®
Trenchless pipe rehabilitation of pressure piping systems
Close-fit reduction process (Swagelining/DynTec)
The reduction process was developed for the rehabilitation of pressure pipelines in the wastewater, drinking water and gas sectors.
As part of the reduction process, a PE pipe run is drawn though a die that elastically deforms the PE pressure pipe under a continuous axial tensile load and briefly reduces the cross section by up to 12%. The pipe run with its reduced cross section is then drawn into the old pipe. After insertion and the elimination of tensile stress, the PE pipe returns to its original outside diameter and clings to the inside wall of the old pipe to create a "close fit".
The outcome of this rehabilitation method is a new, independently load-bearing pressure pipe that merely reduces the original hydraulic capacity of the pipeline by the wall thickness of the PE liner. In functional terms, the old pipe is no longer used after rehabilitation.
As a system manufacturer, SIMONA offers for the reduction process not only pipes and electrofusion sockets but also application-specific fittings depending on the special dimensional requirements.
Trenchless pipe rehabilitation of pressure piping systems
Lining of pressure pipelines with annular space
In pipe lining with annular space factory-produced pressure pipes made of PE 100 RC or PE 100 SPC RC are welded together on the construction site to make up a pipe run with axial-restraint connection. These are new, structurally self-supporting lining pressure pipes.
The pipe run is connected up to a traction head and drawn into the old pipe via a site launch pit, taking the bending radius of the new pipe into account. The resulting annular space between the old pipe and the new pipe is either grouted or not grouted, depending on the condition of the old pipe. When using this method, the original cross section of the pipeline is reduced by the annular space and pipe wall thickness.
As a system manufacturer, SIMONA supplies pressure pipes, pressure-class-compliant standard fittings and application-specific special fittings according to the requirements of the situation on site – solutions tailored specifically to this method of lining.
Trenchless pipe rehabilitation of pressure piping systems
SIMONA® plastic pipes for trenchless pipeline construction
In all fields of application trenchless pipelaying methods have now become standard. The possibilities of pipe renovation or no-dig renewal are numerous. SIMONA offers piping systems for the end-to-end rehabilitation of pipelines – tailored to the various methods currently deployed in this area. The piping systems are a combination of standard or application-specific special pipes and the associated system fittings.
The legal basis for the renovation and renewal of drainage systems outside buildings is provided not only by relevant laws and administrative provisions but also by DIN EN 752 in particular. This standard defines a framework for the planning, construction, rehabilitation and operation of drainage systems.
For rehabilitation of pressure pipelines the Code of Practice of DVGW W403 and Worksheets GW 320-325 serve as decision-making aids for the rehabilitation of water pipes.
