Process description

Process description The main principle of continuous advancing mandrel process is to use glass fiber reinforcements in the circumferential direction of pipe. Hoop rovings provide strength to GRP pipe against circumferential and external loads. Chop rovings inside of pipe structure empower the strength against longitudinal loads and multi direction loads. Silica sand is used in the pipe core and enables the pipe to have a sandwich structure. In some special cases, vinylester and other resins can be used instead of polyester resins.

Production line

All continuous filament winding pipe production operations are performed on the CFW Machine. The GRP pipe is produced continuously, cut at the required length, the spigot diameter is calibrated on-line and the pipe is immediately ready for testing and installation. Technobell also designs and supplies various CFW Auxiliary Machines (Pipe Hydro-Testing Machine, Sleeve Grooving Machine, Off-line Rectification Machine, Sleeve Hydro-Testing Machine, Sleeve Joining Machine and Pipe Transport Trolley) and the Universal Testing Machine.

High level of automation

The CFW Machine is completely digitally controlled by an advanced PLC controller. All machine operations and the dosing system are controlled by computer. Remote connection can also be used for off-site support and troubleshooting thus allowing the client to save time and run the production smoothly 24/7.
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The Universal Testing Machine (UTM) is used to test the tensile stress and compressive strength of materials. It can perform many standard tensile and compression tests on materials, components, and structures such as:

-axial tensile according to ASTM D 638,

-hoop tensile for DN >250 mm up to 2000 mm – split disc method according to ASTM 2290,

-hoop tensile for DN > 2000 mm up to 4000 mm – short strip method according to ISO 8521 method D,

-flexural strength according to ASTM D 790,

-compression according to ASTM D 695 and

-pipe stiffness according to ASTM D 2412.


Another advantage of the GRP pipe system offered by Technobell are customised fittings.

Technobell know-how and equipment enables the manufacturing of a full range of GRP fittings such as:
  • elbows,
  • tees,
  • reducers (concentric, eccentric),
  • flanges (fix, loose, blind),
  • wyes,
  • sleeve joints and

GRP pipe fittings cover many components that connect pipe ends for in-line, offset, multi-port, and mounting configurations.

Fitting cross sections are circular in shape to mate with the pipe sections they are connecting. They are used in pressurized applications and non-pressure applications such as drainage, waste, and vent systems.


GRP pipes are joined with:

    • GRP Sleeve,
    • GRP Flanges,
    • GRP Lamination – welding and
    • others.

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