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Above Ground

Because of excellent resistance against the impact of UV lights, Subor GRP Pipes ensure reliable solution for above ground installations.

Depending on the specific project requirements, different design provisions and supporting methods may be applicable for aboveground applications. For appropriate design parameters, please consult with your piping engineer and Subor.


The structural design procedure for buried fiberglass pipe involves establishing design conditions, selecting pipe classes and corresponding pipe properties, selecting installation parameters, and performing pertinent calculations to ensure that the design requirements are satisfied.

A properly installed Subor GRP Pipe can be buried much safer and deeper than a similarly installed rigid pipe because of the flexible pipe/backfill interaction. In order to enhance the interaction and to avoid excessive deflection, external loads acting on the pipeline have to be transferred to the ground. In this context, the selection of correct backfill material incorporated with the pipe rigidity plays a crucial role in the buried systems.
Material placed and compacted in the bottom of the trench to replace over excavated material and/or to stabilize the trench bottom if unsuitable ground conditions are encountered.
Backfill material placed in the bottom of the trench or on the foundation to provide a uniform material on which to lay the pipe.
Backfill material placed at the sides of the pipe and up to 300 mm over the top of the pipe. The backfill materials are classified in different groups based on the soil stiffness when compacted and the groups are shown in the table below. If the backfill material is required to be compacted, a surface plate vibrators, vibratory rollers, or internal vibrators shall be used and
Backfill material placed from the top of the initial backfill to the ground surface in order to preclude damage to the pipe and disturbance to pipe embedment. Depending on the backfill material type, a cover of at least 0,8 m to 1,2 m shall be considered. If there is a risk of pipe flotation, the burial depth should be at least equal to the pipe diameter.
Unbalanced hydrostatic thrust forces occur at changes in direction when a pipeline is subjected to an internal pressure. In order to avoid coupling separation and damages due to pipeline movements, thrust forces must be adequately restrained by using a thrust block.
While connecting GRP pipes to rigid structures, short pipes (rocker pipes) shall be used to minimize the bending and shear stress acting on the pipe due to the excessive settlement difference between pipe systems and rigid structure. The short pipes shall be installed in straight alignment and the surrounding soil shall be compacted properly and with extra care.


Superior features such as high corrosion resistance, low maintenance cost, long service life, economic installation and easy handling make Subor GRP Pipe a unique choice in subaqueous installations. Marine harness lugs are applied on pipe surface adjacent to couplings and they are used to keep the pipe springs together during the installation works. The marine lugs also help divers during loading, transferring, and sinking operations and also to assist with the jointing operation under water.


The innovative GRP pipe systems of Subor include ideal solutions in areas such as crossings and culverts under the roads and buildings and also renovation of existing pipelines.

Microtunneling / Jacking Installation

In accordance with the capacity of Tunnel Boring Machine (TBM), Subor is capable to offer customized jacking pipes, which maximize the performance of the pipe system while easing the jacking operation.


As a result of the advance manufacturing technology and use of composite materials, Subor GRP pipes offer excellent hydraulic properties, chemical resistance and long service life for the replacement and rehabilitation of existing lines.