EXXONMOBIL - ASABO COMPLEX

Offshore Nigeria - 2001

Platform

The Asabo complex consists of three bridge-linked structures, a Quarters Platform (QP), a Gas Injection Platform (GIP) and a Production Platform (PP).

Challenge

MSL was commissioned to assess the ability of the topsides structures of the three platforms to support and withstand blast loads. Further, the study was aimed at recommending remedial measures to enable the topsides of all three structures to resist these loads and definition of load-mitigation measures.

MSL Scope

MSL’s scope of activities were sub-divided into three Phases:

• Phase 1 consisted of blast response analyses for the topsides of the GIP platform and an assessment of options for strengthening or replacing existing fire walls.

• Phase 2 consisted of the analysis of options to mitigate the explosion loads on the primary framing of the three platforms and, in particular, by the replacement of deck plates with grating.

• Phase 3 related to the detailed design of blast walls and preferred strengthening schemes suggested by the results of Phases 1 and 2.

Benefits

Substantial cost benefits were delivered without compromising safety through judicious use of mitigating measures such as replacement of deck plate with grating. The study was concluded within a timeframe consistent with the planned maintenance schedules for the platforms.