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Comprehensive Upgrade of Detroit Water & Sewerage Department Control Systems

The Detroit Water and Sewerage Department (DWSD), serving over 4 million customers, initiated a system-wide upgrade to address limitations of its old control systems that hindered monitoring and response capabilities. The project aims to improve efficiency, reliability, and water quality while minimizing combined sewer overflow (CSO) events. Highlights include enhanced alarm management, remote monitoring, and redundancy in communication. The upgrade has resulted in better management of distribution systems, reduced operations costs, and increased energy efficiency, while establishing a roadmap for future improvements.

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Comprehensive Upgrade of Detroit Water & Sewerage Department Control Systems

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  1. System-wide Process Controls Upgrade Detroit Water & Sewerage Department

  2. System-wide Process Controls Upgrade Agenda • Detroit Water and Sewerage Department (DWSD) • Old Control System Limitations • Project Scope • Design Highlights • Implementation Challenges • Project Results • Moving Forward

  3. Detroit

  4. About DWSD Third largest municipal water and sewer utility in the United States Over $500 Million in revenue Provides services to more than 4 million retail and wholesale customers Service area of 1079 square miles Yellow - Wholesale Red - Retail

  5. Water Wastewater Systems DWSD System Overview • 5 Water Treatment Plants • 20 Water Booster Stations • 10 Wastewater Collection Stations • 1 Wastewater Treatment Plant • 7 CSO Basins • 13 In-system Storage Devices • 200 Remote Monitoring/Control Sites Valve, Pressure, Sewer Meter, Precipitation Gauge, CSO outfall, Dam, Level

  6. Old System Limitations • Limited monitoring due to constraints on “tone multiplexing” • Single line of communication • Limited configuration options for Operator (Trending, Alarming, Historical Reviews) • Unable to provide Equipment status and Process Alarms • Parts and repair services becoming unavailable • Extremely difficult to integrate with other control systems

  7. Background - 1964

  8. Background

  9. Background

  10. Background

  11. Project Scope • Provide system monitoring and control from a single location • Provide common equipment and functionality at all locations • Achieve economies of operation • Increase system reliability at SCC and remote facilities • Ensure continued high water quality • Ensure stable water distribution pressure • Minimize CSO events • Continue effective wastewater treatment

  12. Project Scope • Improve efficiencies of operations and maintenance personal • Maximize use of standard off-the-shelf hardware and software • Better Alarm Management • Provide Redundancy • Communication co-ordination (regular and emergency) • Provide role based security access • Provide historical database

  13. Scope Highlights • Description of new control system • System component layout (include diagram) • System Control Center video wall map • RTU types • Redundant communication description • Redundant Power sources • Historical data collection • Disaster Recovery

  14. Control System Upgrade • Implementation Process • Design workshops • Graphics workshops • Control narrative workshops • Factory Acceptance Testing • Phase over testing • System acceptance testing • Training (more than 700 people)

  15. Control System Network

  16. Primary Communication

  17. First backup Communication

  18. Secondary backup Communication Radio repeater Sites

  19. Pump Station Features • Automatic Pump Control • Auto Pump Sequencing • Communication Redundancy • Instrumentation redundancy • Detailed equipment alarms • Power redundancy

  20. Pump Station

  21. Remote monitoring site Features • Communicates to SCC and other remote sites via 900 MHz spread spectrum radios • Custom protocol for security • Can communicate to 10 other locations • Remote configuration/parameter changes capability

  22. Remote Site

  23. Implementation Challenges • Limited system access during peak season periods • Multiple System Networks • Phase-over conducted on live system • Physical relocation of Operations staff • Adaptation of Operations staff

  24. Solution

  25. Solution

  26. Solution • Better monitoring capability - • GIS based video wall map • 3600 graphics • Alarm Management • 30,000 I/O points/tags • Network diagnostics graphic • Control system diagnostics graphic

  27. Project Results • Better management of distribution systems and remote sites • Improved ability to react to rapidly changing conditions • Reduced operations and maintenance costs • Improved Alarm Management • Increased Energy Efficiency • Automated operational reports generation • Increase system availability • Implemented regulatory reports

  28. Lessons Learned • More collaboration with end users during design phase • Software upgrade strategy needed • Revision control • System security

  29. Moving Forward • Backup control center • System-wide software and hardware upgrade • Energy Management • Hydraulic Modeling Integration • Additional automated reporting • Ongoing software strategy improvements

  30. Backup Control Center

  31. Questions & Answers Detroit Water & Sewerage Department

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