Repair strategy for fertilizer prill tower Chemicals Case Study - Terra (Nitrogen) UK Ltd, Bristol, UK. Making good chemical damage to a structure while still in operation. In its manufacture, the agricultural fertilizer ammonium nitrate is pelletized by spraying the product in liquid form from the top of a concrete tower. As the liquid droplets fall and dry, they form pellets or prills. Ammonium nitrate is very aggressive to reinforced concrete. This 100m high tower at Bristol, built in 1964, had suffered deterioration in its top-of-tower plant room which threatened future operation. Plant shut-down would have incurred significant daily costs and was not an option. Repairs, therefore, would have to be undertaken with the tower on line. Major repair work at up to 100m above an

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