Abstract
Offshore Platforms are typically installed at a flat seabed area. However, the site selected for Rosmari Marjoram Offshore Platform (RMP) location has widespread presence of pockmarks, resulting in an uneven seabed where the conventional mudmat design is not feasible and this typically requires seabed preparation work (e.g rockfill) which is costly and has residual risk to pile and conductor installation. This is where engineers ingeniously deal with challenges by tailoring a mudmat shape that will ‘fit’ the unlevelled seabed around Rosmari Platform location to address the risk to jacket on-bottom stability during installation. This paper intends to highlight the unique challenges and complexity of Rosmari Marjoram Offshore Platform (RMP) jacket foundation design, and how the team successfully address the issues.
The ‘Bespoke’ skirted mudmat foundation option was proposed whereby the sizes and shapes of the skirted mudmat baseplates were ‘tailor-made’ to conform with the flat portions of the seabed. Assessments were done thoroughly which concludes that adequate bearing and sliding stability during jacket on bottom.