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

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Presentation transcript:

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 ▼ First overall technical evaluation of all pumping facilities and equipment

City of Bellevue WBPS 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 ”

City of Bellevue WBPS 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

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

City of Bellevue WBPS Evaluation Project Challenges

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

Ranking Pump Stations Ranking WBPS Needs PairedComparison Normal Operation PairedComparison Emergency Operation

Ranking Evaluation Criteria

Pump Station Score Card

Normal Operating Ranking

Ranking Pump Stations Ranking WBPS Needs PairedComparison Normal Operation PairedComparison Emergency Operation

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

Sample Risk Ranking

Emergency Operating Scenario

Combined Rankings

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