This Alert highlights the risks associated with maintenance work in a confined space, such as a storage tank that has an internal floating roof, and suggests control measures to address these risks.
Background
In a recent incident at a major hazard facility (MHF), the internal floating roof of a storage tank collapsed down to the support leg stop position while a maintenance task was being carried out. The support leg stop position is designed to support the internal floating roof at a predetermined rest height just above the storage tank floor.
