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Experience with High Performance HMI at Two Durham WRFsNC AWWA-WEA Annual ConferenceRaleigh Convention CenterNovember 15, 2016
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John Dodson – City of DurhamDan Edwards – Hazen and Sawyer
Presenters
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Presentation Outline
• Project History• New System• High Performance HMI• Implementation at Durham• Operator Experience• Benefits of HPHMI
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Project History
• Major plant upgrade/expansion projects in early-mid 90’s
• New Distributed Control Systems (DCSs) for each plant
• Replaced with PLC-based systems in late 2000’s
• Tried to emulate DCS functionality and displays
• City not satisfied with result
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New System
• Additional process/capacity improvements in early 2010’s
• Decision to replace Human-Machine Interface (HMI) software• Major parts of process being modified
• Planning on replacing HMI soon
• Eliminate re-work in future
• Hazen recommended City consider High Performance HMI
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Traditional HMI Displays
• Original displays simple schematics
• Graduated to 3D and photos
• Admittedly visually pleasing
• Important info lost in clutter
• Numbers without context
• Alarms don’t stand out
• May not enhance situational awareness
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High Performance HMI
• Accidents in the process industries• Advent of the glass cockpit in aviation• Need for better situational awareness• 2008 book “The High Performance HMI Handbook”
by Hollifield, Oliver, Habibi, and Nimmo
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High Performance HMI
• Use of muted colors –no red/green
• Alarms bright red/yellow and flash
• Bar graphs with normal/alarm ranges
• Spark lines – miniature trends
• Hierarchical displays
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Implementation at Durham• Incorporated requirements
into project specifications
• Required four graphic display workshops• Work through concepts before
production
• Staff buy in and comfort factor
• Collaborative team approach
• Pre-selection of control system integrator• Work under contractor
• Initially skeptical
• “Born again” converts to concepts
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Summary of HPHMI Benefits• Understanding of process health “at a glance”• Quickly notice alarms• Easy access to trends• Better situational awareness• Easier, faster, more effective troubleshooting
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Acknowledgements
Charlie Cocker – City of DurhamNewman Gunter – City of Durham
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Questions?