Method of and system for coating a field joint of a pipe

A system for coating a field joint of a pipeline, the system comprising:

• a mould tool positionable around the field joint to define a mould cavity of a first volume;
• a body comprising a thermoplastics material, the body being arranged to fit into the mould cavity and having a second volume selected such that the body can fit into the mould cavity, wherein the body comprises, in longitudinally outward succession from a longitudinal center, a relatively thick central portion and ramp surfaces leading to relatively thin end portions;
• and a heating system for heating the body in the mould cavity to effect thermal expansion of the thermoplastics material;
• wherein the thermoplastics material has a coefficient of thermal expansion such that, when heated in the mould cavity, the body would expand to a third volume greater than the first volume if such thermal expansion were not constrained by the mould tool.