Emerson Process Management has supplied valve automation to an entertainment and tourism destination in Durban, South Africa. uShaka Island Marine World contains an aquarium, a dolphinarium and a seal stadium. Emerson’s valve automation solution was provided to control the flow of seawater to the filtration units and to maintain tank levels. Water quality is very important, both in respect of chemical and biological quality and of clarity: the target for clarity is that there should be over 50 metres of clear visibility in each of the exhibits. Because of these stringent requirements, it is necessary to have extensive filtration systems. SAME Water Projects, who designed and installed the filtration systems, will use the Emerson solution for filter feed and backwash control as well as controlling level in the tanks and isolating the piping system. Two hundred thirty-five of the EPDM rubber-lined butterfly valves are automated with Emerson El-O-Matic E series actuators, 25 of which have modulating positioners. The valves range in size from DN80 to DN600 and have nylon-coated discs to suit the seawater application. The remaining actuated valves are fitted with NAMUR compatible solenoid valves and switchboxes. The actuators are mostly double-acting and range in size from ED40 to ED1600; there are also two PD2500s fitted to DN600 valves.
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