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Prioritizing Booster Pump Station Improvements

Prioritizing Booster Pump Station Improvements. Tom Peters, P.E. May 2, 2008. City of Bellevue WBPS Evaluation Overview. Owns and operates 23 major water booster pump stations Pumped water service for over 60% of customers

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Prioritizing Booster Pump Station Improvements

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  1. Prioritizing Booster Pump Station Improvements Tom Peters, P.E.May 2, 2008

  2. City of Bellevue WBPS Evaluation Overview • Owns and operates 23 major water booster pump stations • Pumped water service for over 60% of customers • First overall technical evaluation of all pumping facilities and equipment

  3. City of BellevueWBPS Evaluation Project Goals • Efficient distribution of maintenance dollars • Identify facilities whose failure significantly impacts system reliability • Rank WBPS in order of needed improvement • Develop costs to upgrade and Improve WBPS reliability • Asset management “building block”

  4. City of BellevueWBPS Evaluation History • Grown from merger and assumption of old water districts • Some facilities developer constructed • Historically wholesale water purchase from City of Seattle • Member of Cascade Water Alliance

  5. City of Bellevue WBPS Evaluation Project Challenges • Multiple pump types • Varying levels of building quality • Below grade vaults • Inefficient location of emergency power • Absence of re-chlorination facilities

  6. City of Bellevue WBPS Evaluation Project Challenges

  7. Pump Station Information and Data • Thorough review of as-builts, maintenance records, water production and previous studies • Analysis of peak and average day consumption, by pump station and operating zone. • Rigorous assessment of each pump station condition, with video taped operator interview • Development of 10 system schematics summarizing basic system information

  8. Ranking Pump Stations Paired Comparison Normal Operation Ranking WBPS Needs Paired Comparison Emergency Operation

  9. Ranking Evaluation Criteria

  10. Pump Station Score Card

  11. Normal Operating Ranking

  12. Ranking Pump Stations Paired Comparison Normal Operation Ranking WBPS Needs Paired Comparison Emergency Operation

  13. City of Bellevue WBPS Evaluation Risk Based Assessment • Risk = Hazard Probability X Vulnerability X Consequence • Hazards impacting multiple facilities pose the greatest risk • Regional power outage • Earthquake • Flooding • Redundancy, properly placed, provides effective mitigation

  14. 100 Highest Risk Pump Stations Likelihood of Failure Percent Lowest Risk Pump Stations 0 0 50 100 150 Consequence of Failure Score Sample Risk Ranking

  15. Emergency Operating Scenario

  16. Combined Rankings

  17. SUMMARY • WBPS assessed: 23 • WBPS requiring improvements: 21 • Total cost all improvements: 21.4 M • Average cost of replacement (5): 2.9 M • Average cost of improvements (16): 0.43 M

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