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GRP pipes

Depending on the axial force to which they will be subjected and/or the installation method, ROREX can produce four types of pipes: uniaxial, biaxial, sandless and jacking pipes.

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Uniaxial pipes (standard)

These are the most common pipes, designed for underground installations where they are supported by the adjacent soil and backfill material. In this type of pipe, the action of axial forces due to the change of direction is taken up by the thrust blocks.

ROREX can produce on request pipes in the length range 0.3 – 15 m for diameters greater than 300 mm. Other intermediate diameters between 100 mm – 4000 mm are available on request.

The classification of pipes into pressure classes was done in accordance with the specifications in the AWWA M45 Fiberglass Pipe Design Manual. The evaluation of pipelines in pressure classes was done at full operating pressure and at the maximum recommended burial depth. Other pressure classes can be supplied on request.
On request, pipes with stiffnesses higher than 10,000 Pa or other intermediate stiffnesses can also be executed.

Additional information on pipe properties, tests for quality control of finished pipes or considerations for design and proper operation can be found in the ROREX General Presentation Catalogue in the “Downloads” menu.

The most important parameters to take into account for the installation of underground pipes are stiffness and pressure class. The maximum burial depth is determined by a complex static calculation which takes into account the geotechnical and hydrogeological characteristics of the natural terrain, the nature and degree of compaction of the backfill material and the stiffness class of the pipeline.

To ensure good and long-lasting performance, ROREX GRP/PAFSIN pipes require proper handling and installation. The recommended installation conditions must be observed, as well as the use of an appropriate filler and backing material.

Further information on the installation of underground pipelines can be found in the ROREX Installation Manual under the “Downloads” menu. For full installation instructions, please consult the ROREX Technical Department.

Biaxial pipes
They are designed for both above-ground and underground applications where the soil is weak and offers very little support. In this type of pipe, the axial forces due to the change in direction of the fluid are taken up by the pipe and its couplings. Biaxial pipes can only be joined together with restrained (blocked) couplings: adhesive bonded (combi) couplings, laminated (lay-up) joints, flanges.
Further details on the physical properties of ROREX biaxial pipe and recommended couplings can be found in the ROREX General Presentation Catalogue in the “Downloads” menu.
NO-SAND PIPES

They have physical, mechanical and chemical characteristics far superior to those of pipes that contain sand and are used in special applications or when the working pressure is very high. Compared to standard pipes, no-sand pipes have:

  • Superior impact resistance, much better resistance to impact during handling and installation.
  • Longer service life due to increased long-term performance properties of the pipes.
  • Lower risk of manufacturing defects because the production process has one less parameter to control
  • Lower hydraulic losses for the same nominal diameter

Further details on the physical properties of no-sand can be found in the ROREX General Presentation Catalogue in the “Downloads” menu.

Jacking pipes

They are pipes installed by horizontal drilling. They are designed for trenchless applications and installed by pipe jacking or horizontal drilling, i.e. by pushing the pipe into the ground with a hydraulic jack, which sits behind a shield that digs all the way through.
Pipe jacking pipes are made to withstand a high pushing force (700 -1000 tons) over long distances (30 – 100 m). This requires a much thicker wall than standard uniaxial pipes. In general, their length is max. 3 m so that they can be easily manoeuvrable throughout the process, especially in the vertical shaft leading to the work base.