The hot plate temperature must be 210 C. The hot plate must be clean and free of grease. Ensure that the two pipe brackets and the two pipe supports are correctly aligned. Both pipe clamps must be adjusted so that they hold the pipe tightly enough to withstand the force of the welding process.

Pipe laying progresses with the lay vessel moving forward on its anchors. The pipe is placed on the seabed in a controlled S-bend shape. The curvature in the upper section, or the overbend, is controlled by a supporting structure, called a stinger, that is fitted with rollers to minimize damage to the pipe.

There are five assembly methods for HDPE pipes:

• BUTT FUSION / WELDING
• ELECTRO FUSION
• COMPRESSION FITTING
• SOCKET FUSION
• MECHANICAL BOLT TYPE COUPLINGS