Pipe section for use in a submerged pipeline system, the submerged pipeline system and the use thereof

A method for preparing a pipe section, comprising:

• providing a pipe section with a cylindrical spigot for use in a submerged pipeline system, in which the pipe sections are fitted at each end of the pipe section with a cylindrical spigot having dimensions and threading suitable to engage with bell ends of a coupling device, wherein the pipe sections are made of an engineering thermoplast and wherein the cylindrical spigot is made of a composite material comprising an engineering thermoplast reinforced by fibres and a cured resin composition;
• providing an end-piece, which end-piece is a piece of pipe of no more than 12 meters long, composed of an engineering thermoplast;
• and
• fixing the end-piece by rotational welding onto the pipe section for use in a submerged pipeline system, in which the pipe sections are fitted at each end of the pipe section with a cylindrical spigot having dimensions and threading suitable to engage with the bell ends of the coupling device.

A method for preparing a pipe section or an end-piece for use in a submerged pipeline system, which method comprises embedding a woven fibre mat into the pipe sections made of engineering thermoplast by

• a) applying heat to the engineering thermoplast, thereby softening an outer layer of the engineering thermoplast;
• b) winding the woven fibre mat tightly around the end parts of the pipe section or end part of the end-piece;
• c) allowing the temperature of the engineering thermoplast to cool such that the outer layers harden and the woven fibre mat is fixed to the engineering thermoplast;
• d) winding a resin impregnated roving comprising the thermosetting resin around the end-part(s) of glass-fibre reinforced engineering thermoplast and curing the resin or allowing the resin to cure, to form the composite material;
• and
• e) shaping the composite material into a spigot.