The task includes among other things the execution of construction elements with earthworks, sub-bases, foundations, insulations, expansion joints and resin floors; realisation of a brick electrical room; execution, delivery and assembly of a steel structure; realisation of an electrical room for the FLS local panel (sandwich panel on steel structure) on the platform of the exchangers tower; assembly of a discharge pump, ammonia water tanks, an industrial pump, PMT assembly of a transfer pump, PMR-delivery and assembly of stainless steel pipes.