The glass fiber laminate is applied onto the moving mandrel according to the following procedure: firstly a release film, e.g. polyester film, is wound on the mandrel, followed by a c-veil, both of them supported by proper winders. Glass roving, together with chopped glass, sand aggregate and polyester resin, is applied simultaneously in predetermined positions, according to design specifications. Finally, a layer of surfacing veil is applied. According to the process philosophy, the inner layer provides the required chemical resistance, while the material applied over the liner layer represents the mechanical resistant outer layer. The pipe’s layers can easily be made in compliance with the appropriate design by controlling the quantity and sequence of various materials applied.