LANCASHIRE, UK – Trelleborg’s engineered products operation has supplied a range of custom floatover solutions to the Saipem Zawtika project offshore Myanmar. This includes four deck support units (DSUs) and leg mating units (LMUs), which were manufactured with a larger compression design to cope with waves exceeding 2–3 m (6.5–9.8 ft). The Saipem Zawitka project field is in block M9 in the Gulf of Martaban, Myanmar.
LMUs consist of steel structures incorporating engineered elastomeric pads, and they make a floatover transition possible by damping the forces created as the topside’s load is transferred to the jacket. The elastomeric pads are designed to take up the static and dynamic forces of the topside structure, as well as the horizontal forces due to open sea motions during the float-over mating operation. The assembled LMU can be installed either on the topsides or jacket.
DSUs are also important components for safe floatover operations. The topside is loaded onto the vessel with a deck support frame and the DSUs are then placed between them to absorb the weight of the topside. This enables the LMUs and DSUs to work together in synchronization during the installation phase. When the heavy vessel starts to ballast, decompression will occur on the DSUs and vertical compression occurs on LMUs.