The initial contract was to cover the inlet works to contain the odours below from where they could be ducted to a new odour control plant. A major consideration was the regular flooding of the area. The covers would need to not only contain odour but be able to withstand flood water in excess of 2 metres depth.
Working with the Client and the consultant, a solution was developed utilising an array of “flood pressure relief hatches” to balance water pressure above and below the covers.
As this area was already hand-railed, the covers were considered non-accessible giving a considerable saving over the original plan to remove the rails and have the covers accessible at the higher loading.
A solution was developed that gave the operatives a safe means of access to the area with covers designed for an imposed load of 1.5kN/m2 as specified in WIMES 8.05 appendix G - accessible covers.