Case Study: Repurposing a Tank Farm

A large US food manufacturing company planned to repurpose a tank farm, originally used in the manufacture of ice cream.  The repurposing of the tank farm could be considered a greenfield installation, providing various oils to a new fryer system. The new designs would allow the storage and transfer of (1) newly delivered oil, (2) flavored oil to be reused and (3) waste oil to be discarded.

ECS Solutions was hired to help evaluate the existing system which was controlled by five Allen-Bradley SLC 5/03 PLCs.  The ECS engineers determined the IO was sufficient for the planned changes as well as many of the existing valves. ECS redesigned the controls incorporating one new Allen Bradley CompactLogix controller to control the system and an Ethernet network to connect each of the existing SLC racks, which would be repurposed as remote IO racks. In addition, we provided new PowerFlex variable frequency drives to control the pumps that would move the oil from place to place.  An existing Inductive Automation Ignition operator interface application was expanded to incorporate the oil storage system.  In effect, the scope of the project was to evaluate the control systems available and to incorporate new controls where required.


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