The problem Our client was responsible for the project management of an intervention on a sea sump caisson on a platform in the North Sea. The caisson was open ended and receiving discharge from sand wash activities, deck drains and seawater overow from diesel tanks. The caisson had become blocked between -46m and -84m and needed to be cleared. The client required an intervention plan, which involved cutting a number of holes in the caisson to allow access for hoses and dredging equipment to remove the blockage. The holes had the potential to weaken the caisson and an assessment was required to ensure that the integrity was acceptable for the remainder of the caisson’s eld life. We were commissioned to analyse and assess the current structural integrity of the caisson and predict its in

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