HmT Mechatronics as a subcontractor to LGA Electrical automated the process of transferring diesel from a downstairs “storage” tank to the upstairs “header” tanks. The fuel is used for 2x backup generators in the event of power failures at the foreshore Telkom building in the CDB of Cape Town. The project’s main focus was safety and all equipment installed had to be EX rated.
The level in the four tanks (2x “storage” & 2x “head” tanks) had to be monitored at all times while two EX Calpeda centrifugal pumps supplied the generators with fuel. The level probes’ signal was fed through EX rated barriers to the PLC controlling the process. When a low level in any of the four tanks occurs, and/or a low pressure is detected and the pumps must shutdown and start up again once the error conditions has been cleared. Feature such as no-flow, pump failure, pump overload, pump load shedding, running hours and alarm SMS was also incorporated.