The Natref petrol refinery, located in the industrial region of Sasolburg, was commissioned in 1971 and is one of South Africa’s oldest inland refineries. Historically, engineers at the refinery have had difficulties monitoring the operations of circuit breakers at the refinery’s substations, leading to increased maintenance costs and unplanned down-time. Here, Ian Loudon, International Sales and Marketing Manager at Omniflex, discusses how alarm annunciators and sequence of events recording came to the aid of plant operational managers at the refinery.