GRP Pipe Lamination

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In EFG, different types of resins are used for the manufacturing of RTRP (Reinforced Thermosetting Resin Pipes), which are selected according to the required properties like chemical resistance, temperature resistance and mechanical properties. The properties of FRP (Fiberglass Reinforced Plastic Pipes) can be varied by changing the ratio of the raw materials. Glass fibers provide strength and stiffness to a composite material. According to the type of resin used, FRP pipes can be classified as; GRP - Glass Reinforced Polyester (Iso-phallic resin) GRV - Glass Reinforced Vinyl ester (Vinyl ester resin) GRE - Glass Reinforced Epoxy (Epoxy resin)
Lamination Joint
This is a restrained joint system used for joining plain end pipes which consists of overlapping layers of fiberglass reinforcement thoroughly impregnated with the resin to achieve the specified width and thickness. It provides continuity in both hoop and axial directions. It is generally preferred for field adjustments and repair work where no other joint systems can be used. This joint is also called butt and strap joint and it results in high strength and requires skilled labor. Once the core pipe is laminated and tested successfully, jacket pipe cut to exact length to fit in the joint area is installed. This jacket pipe piece is laminated with the main jacket pipe by the same procedure. A nozzle is made on the jacket pipe to carry out the air test and subsequent injection of poly urethane foam. This type of joint is applicable for all the available pipe sizes.
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