Management of Network Cost & Risk Via Fuzzy Logic Pump Centre Conference 2018 By Robert Hale, Senior Consultant + 44 (0)1872 260005 www.riventa.com
Riventa Ltd. are… Riventa (UK) Ltd. Background Head Quarters … an OEM of precision instrumentation and analytical software … a worldwide provider of high quality hydraulic analytics consultancy Riventa Korea Co. Ltd Based in Seoul covering Asia … probably the most innovative pump performance testing company Riventa Inc. (USA) Based in Las Vegas Riventa CANADA Inc. Based in Toronto + 44 (0)1872 260005 www.riventa.com
Recognition of Increasing Impact of Spills Increasingly higher fines on top of existing clean-up & compensation costs • Cat 1 & 2 pollution incidents for all 9 Water & Sewage Co’s are on a downward trend but are seeing resistance at ~55/year. • “ There is no common root cause of incidents. The main factors which contribute are inadequate monitoring and management , and shortcomings in risk assessment, operational practice and staff culture .” ref: EA Water & Sewerage Performance Summary 2016 + 44 (0)1872 260005 www.riventa.com
Reducing Risk & Cost via Improved Control Use of Fuzzy-Logic Controller to Improve Risk Management Planned Pumping Station Standard Maintenance Reliability Maintenance Efficiency Procedures Matching of Proactive Common Pumps to Demand Maintenance Standards Redundancy Minimisation & Trustworthy Commonality Performance Asset BAT of Spares Data Exercising Tailored Tailored Control Control Preventative Philosophy Philosophy Maintenance Fuzzy Logic Maximise Available Controller Forward Flow Capacity Storm Water Utilisation of surge storage where available Management RISK MANAGEMENT PROTOCOL + 44 (0)1872 260005 www.riventa.com
Reducing Cost via Sump Level Control Sensitivity of Sump Level to Energy Consumption • Consider Following • Higher sump level Lower Sump Level now 2m Higher.. Head Lower kWh/Ml Example: • Higher sump level Lower Fixed speed o submersible pump in a ‘Time to Spill’ Higher Risk… standard SPS sump Static Head = 8m Static Head = 6m • Therefore, need to intelligently Operating at BEP o balance Risk vs. Energy Savings Running to a relatively o • Link series of SPS’s together to low sump level under Reduction in dry weather flow improve management of both: kWh/Ml of 12% conditions • High-flow events (Storm) Control limited to local o • Reduction in capacity SPS only At BEP Reduction in Hydraulic (Breakdown) Efficiency of ~0.5% + 44 (0)1872 260005 www.riventa.com
Reducing Cost via Level Control & VSD’s Use of VSD’s & Sump Level to Reduce Energy Usage Scenario: H N 1 SPS Wastewater Pumps Operating with VSDs controlling to maintain a set inlet sump level. N 2 System Pump Head reduction, and so Level SP, is Curve 1 dependent on risk to the process (e.g. D H System ‘Time to Spill’) Curve 2 Potential Hydraulic Power Savings: h 2 h 1 h D P H = Q . D H . r . g Prevailing Electrical Power Savings: Flow Rate, Q D P E = Q . r . g . [ (H 1 / h 1 ) - (H 2 / h 2 ) ] Q + 44 (0)1872 260005 www.riventa.com
Fuzzy Logic Example Simulation of Typical SPS Installation Assumptions: 1. Variable Speed Pumps controlling to a set inlet sump level for variable flow. 2. 2 contrasting scenarios: a) Conventional level cascade b) Fuzzy Logic Control 3. 2 membership functions considered for second scenario: a) Flow rate of influent b) Rate of change of influent + 44 (0)1872 260005 www.riventa.com
+ 44 (0)1872 260005 www.riventa.com
+ 44 (0)1872 260005 www.riventa.com
+ 44 (0)1872 260005 www.riventa.com
Energy Savings = 27% + 44 (0)1872 260005 www.riventa.com
Over-Riding Benefits Improved Risk Management + Reduced Energy Consumption • Linked controllers allow all sumps • Risk Reduced Locally & Across and interlinking sewers to be Network: Linking controllers considered one system across a sequence of SPS’s o Temporary reduced capacity (e.g. ragging) • Reduction in Energy leads to alternative operating Consumption: Higher sump configuration levels during low risk periods o Links to met office storm predictions lead to 20%+ energy savings reduce levels and increase storage capacity • Low Cost Deployment: Much o If spill unavoidable, can choose to spill in hardware already in the field location with least impact that is capable of performing this method fast to o Pump unavailability changes risk profile and potential membership function (cost implement of inaction can be measured) + 44 (0)1872 260005 www.riventa.com
Next Steps Requirements for Next Stages of Evolution Plan: Complete • Industry-ready concept • Proven in simulated environment • Potential for hardware-agnostic solution Act: To Be Arranged Do: • Riventa have cloud and/or SCADA • Phased low risk horizontal • Develop risk measurement based platform expansion increasing in scale with protocols for membership functions progressive and proven using industry specific data & info achievements • Pilot concept via collaboration with Check: Water company and framework SI provider(s) leveraging cumulative • Analyse success criteria and knowledge base implement any design changes • Appraise functionality and devise ideal sites for deployment • Business case to maximise ROI, potential for IIoT, Energy Efficiency, and Network Resilience + 44 (0)1872 260005 www.riventa.com
THANK YOU Riventa Ltd (UK) Unit B, 1Walker Business Park Threemilestone Industrial Estate Truro, Cornwall TR4 9FB, United Kingdom Telephone: +44 (0)1872 260005 Email: info@riventa.com Visit: www.riventa.com + 44 (0)1872 260005 www.riventa.com
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