SCADA System

The City of Corpus Christ's six wastewater treatment plants and more than 100 lift stations were previously monitored using a 456 megahertz communication system. The system was in a deteriorated state due to outdated components, exposure to weather, and corrosion of the wiring terminations.  The system provided limited remote alarming and status indication using outdated software. The City wished to upgrade the system to provide remote control capabilities in addition to monitoring for the wastewater facilities.

An upgraded SCADA system would allow control of the system as well as recording of trends, aid in trouble-shooting of the system, and facilitate the spotting of problems or areas where efficiency improvements may be made.  Bath was awarded the contract to design the new wastewater SCADA System. 

This project was divided into a preliminary study phase, a design phase and a construction phase.  The scope for the preliminary phase was to analyze several options for transmitting data for monitoring and control of the wastewater lift stations and six wastewater treatment plants to a central control center.  Nine different technologies which were analyzed were narrowed to three; 450MHZ, 900MHZ MAS and 928MHZ-spread spectrum. 

Scada boxThe following task were completed at each site:

  • Path studies
  • Inventory of all existing I/O
  • Inventory of existing equipment and its condition
  • Radio survey and actual transmission tests

Bath's final report was five volumes of data recommending frequency, methods, hardware, radios, antenna heights, HMI software and overall system cost.

Bath was subsequently retained to complete the design and oversee installation of the $2,000,000 system.