Transformation of a 30 year old Oil Terminal into a modern double LNG Terminal – Part 1: Refurbishment of the Approach Trestle

This paper describes the works that were undertaken to refurbish the existing approach trestle of the South Hook LNG Import Terminal to the standards of a modern LNG facility. Extensive surveys were initially undertaken to determine the condition of the trestle. From this, a refurbishment strategy was devised whereby the deck elements were to be replaced by new composite slabs and the bents were to be refurbished. The bents were repaired by hydro-demolition of the damaged concrete and replacement with a proprietary repair product. Corroded reinforcing bars were replaced and additional bars were added where required. An impressed current cathodic protection system was installed and over-sprayed to protect the structure against corrosion during the required additional design life of 30 years; a titanium mesh was applied above mid sea level and underwater anodes below. As the approach trestle is located in an ecologically sensitive area, special precautions were implemented to ensure that no spillage of contaminated products could occur during construction.