Pipes and Fittings

/Pipes and Fittings

The Pipes & Fittings Division employs two manufacturing processes for FRP Pipes; the discontinuous pipe manufacturing process, and the continuous pipe manufacturing process. Each manufacturing process produces pipes with different ranges of dimensions and technical characteristics for particular applications. Fittings can be produced from pipes manufactured in either of the processes (based on the application).


Extra Co produces GRP (GP or ISO resin), GRV (Vinyl Ester resin), and GRE (Epoxy resin) pipes based on the specifications required for their use.

The discontinuous FRP/RTRP pipe manufacturing process (also known as dual-helical filament winding process) involves winding the resin soaked fiber onto a fixed position rotating mandrel of the required diameter (up to 4m). The pipe is then left to cure and harden before it is extracted from the mandrel. This manufacturing process limits the length of the pipe to the length of the mandrel (usually 9m or 6m), and is a slower process than the continuous manufacturing process. On the other hand, this manufacturing process allows for both radial as well as helical winding of the glass fibers onto the pipe which allows for achieving different tensile and compressive strength characteristics suitable for addressing different applications of varying pressure thresholds.

The continuous FRP/RTRP pipe manufacturing process involves winding the resin soaked fiber onto a dynamic rotating mandrel of the required diameter (up to 2.8m). The winding and curing take place on the same mandrel but at different positions, and the dynamic mandrel continuously and steadily “pushes” the pipe from the winding area to the curing area and finally outside the mandrel. The advantage of this manufacturing process is that the pipe can be cut at any custom length and the production is significantly faster. The limitation of this process is that only radial winding is possible hence limiting the applications in which continuously wound FRP/RTRP pipes can be used.

Some examples of applications for FRP/RTRP Pipes include:

  • Water Network Pipes (Drinking & Drainage)
  • Sewage Network Pipes
  • Oil & Gas Network Pipes
  • Odor Control Ducts
  • Water Impermeable Ducts
FRP/RTRP Spools & Fittings

Spools and Fittings are produced from either discontinuously wound pipes or continuously wound pipes, depending on the application and specifications required. The process is a manual one and requires cutting pipe segments to the required angles and then joined to form the fitting. Some fittings (particularly bends/elbows) are produced by moulding using the filament winding process.The spools and fittings can be produced in GRP (GP or ISO resin), GRV (Vinyl Ester resin), or GRE (Epoxy resin), and can be in RTRP specifications. Extra Co also performs stress, Flexibility, and surge analyses (when required) for the appropiate design speicifications. 

Some examples of spools and fittings include:

  • Bends (of Varying Degrees)
  • T-Connections & Y-Connections
  • Flanges
  • Factory Assembled/Pre-Fabricated Spools