The cooling tower is the backbone of production at MEE Plant which removes heat from critical machinery and processes to keep operations running smoothly. Any disruption to it directly impacts the shopfloor. Recognising this, a safety gap in the pump system was proactively identified and resolved — before any incident could occur
Problem Description
The cooling tower operates with two recirculation pumps — one designated as the duty pump and the other as a standby — both controlled through a single Variable Frequency Drive (VFD) via a common selector switch.
Due to this shared configuration, it was not possible to electrically isolate either pump independently. As a result, any maintenance activity required a complete system shutdown, disrupting plant operations and exposing maintenance personnel to safety risks, as there was no means to fully de-energise one pump while the other remained in service.
Solution
Separate Miniature Circuit Breakers (MCBs) were installed at the VFD output — one dedicated to each pump. This modification creates individual electrical isolation points, enabling either pump to be fully de-energised and locked out independently, without affecting the operation of the other pump or the VFD system.
