Water Pump Stations Condition Assessment and Life Cycle Planning PNWS-AWWA Spring Conference

Transcription

1 Water Pump Stations Condition Assessment and Life Cycle Planning PNWS-AWWA Spring Conference Presented by: Marshall Meyer PE and Shelby Asato PE

2 Agenda Background and Project Need Asset Management Philosophy Planning/Evaluation Approach Development Capital Improvement Plan Flexible Long-Range Capital Improvement Plan and Prioritization 2

3 Background & Project Need

4 Background & Project Need 22 Pump stations Built in the 1960s and upgraded in the 1980s 19 Pump stations evaluated, 3 pump stations recently upgraded

5 Capital O&M Asset Management Philosophy

6 Likelihood of Failure (LoF) Asset Management Philosophy Risk = LoF x CoF Medium Risk Low Risk Consequence of Failure (CoF) High Risk Medium Risk Likelihood of Failure Condition Capacity Consequence of Failure Supply Redundancy Number of Customers Impacted Impact Duration

7 Asset Management Philosophy Risk = Consequence x Likelihood Qualitative Approach Quantitative Approach Less Info Required More Info Required

8 Planning/Evaluation Approach Development

9 Overall Pump Station Impact 1 1 CONDITION 4 5 CAPACITY Good Firm capacity exceeds required capacity Fair Poor Very Poor <90% Required Capacity 1 4 REDUNDANCY Not Critical Failure would not result in significant loss of water service Somewhat Critical Critical but Redundant Critical Failure would result in loss of water service to customers

10 Individual Component of Pump Station: Focus on Needs Is it safe? What condition are the critical components? Is the hydraulic capacity adequate? What is needed to remedy the issues? Can we get parts for it? Are components readily accessible for maintenance?

11 Field Evaluation Approach

12 Pump Station Component Evaluation Categories 1 CONDITION CONDITION 5 Very Good 10+ years likely Fair 5-10 years likely Very Poor <3 years likely 1 CRITICALITY 4 Not Critical Somewhat Critical Critical but Redundant Very Critical 1 SERVICEABILITY 4 Very Good Difficult Access Obsolete Parts Safety Issue

13 Capital Improvement Plan

14 Remaining Life Score Pump Station Component Evaluation Remaining Life Maximum Likelihood of Failure Level Impending Failure Zone Years Pump Station Structure Generator VFDs Pressure Reducing Valves and Control Valves Electrical System (MCB, MTS/ATS, MCC) Starters Rotating Assembly (Pump, Motor) Flow Meter

15 15 Capital Improvement Plan Station Component Condition Rating Action time frame <3 years 5+/- years 5-10 years 10+/- years >10 years Calendar window Long term planning

16 Capital Improvement Plan Clyde Hill Pump Station CIP Clyde Hill Pump Station CIP (Grouped Projects) $3,500,000 $3,500,000 $3,000,000 $3,000,000 $2,500,000 $2,500,000 $2,000,000 $2,000,000 $1,500,000 $1,500,000 $1,000,000 $1,000,000 $500,000 $500,000 $- $-

17 Plans are worthless, but planning is everything. - Dwight D. Eisenhower Flexible Long-Range Capital Improvement Plan and Prioritization

18 Flexible 75-Year Capital Improvement Plan Asset Group Replacement Component Quantity Low Estimated Complexity/Size Cost Range High Rotating Assembly #1 Pumps Motors Ancillary components - $40,000 $10,000 $5,000 $85,000 $20,000 $5,000 $135,000 $20,000 $10,000 $175,000 $30,000 $10,000 $235,000 $40,000 $15,000 Rotating Assembly #2 Pumps Motors Ancillary components - $40,000 $10,000 $5,000 $85,000 $20,000 $5,000 $135,000 $20,000 $10,000 $175,000 $30,000 $10,000 $235,000 $40,000 $15,000 Rotating Assembly #3 Pumps Motors Ancillary components - $40,000 $10,000 $5,000 $85,000 $20,000 $5,000 $135,000 $20,000 $10,000 $175,000 $30,000 $10,000 $235,000 $40,000 $15,000 Rotating Assembly #4 Pumps Motors Ancillary components - $40,000 $10,000 $5,000 $85,000 $20,000 $5,000 $135,000 $20,000 $10,000 $175,000 $30,000 $10,000 $235,000 $40,000 $15,000 Pressure Reducing Valve and Control Valve Pressure Reducing Valve Pressure Relief Valve Pump Control Valve Pump Check Valve Ancillary components N/A 1 N/A 5 6 $15,000 $20,000 $15,000 $15,000 $1,500 $25,000 $30,000 $20,000 $20,000 $1,500 $35,000 $45,000 $25,000 $25,000 $1,500 $50,000 $70,000 $30,000 $30,000 $1,500 $55,000 $90,000 $35,000 $35,000 $1,500 Flow Meter Flow Meter Ancillary components 1 $25,000 $5,000 $25,000 $5,000 $35,000 $5,000 $35,000 $5,000 $45,000 $5,000

19 Flexible 75-year Capital Improvement Plan $3,500,000 $3,000,000 $2,500,000 $2,000,000 $1,500,000 $1,000,000 $500,000 $0 Rehab Rotating Assembly - Replace Impeller Rehab Rotating Assembly - Rewind Motor Replace Rotating Assembly Replace Electrical System Replace VFD Replace Starter Replace Pump Station Structure Rehab Pump Station Structure - Replace Roof Replace Pressure Reducing Valve and Control Valve Rehab Generator Replace Generator Rehab Pump Station Structure - Replace Piping and Valves

20 System Wide 75-Year Costs

21 Conclusions Determine qualitative or quantitative approach Determine data you can track over time Establish evaluation approach Consider likelihood vs. consequence of failure Individual components and system wide impacts Revisit over time

22 Q&A

23 Clyde Hill PS

24 Cherry Crest

25 NE 40 th 670 Zone

26 Parksite

27 Horizon View 2

28 Forest Hills

29 Cougar Mountain 1

30 Cougar Mountain 2

31 Newport

32 161 st Ave Inlet

33 Somerset 2

34 Somerset Inlet

35 Woodridge

36 Meydenbauer

37 Pikes Peak

38 NE 40 th Reservoir

39 Crossroads

40 NE 8 th Inlet

41 SE 28 th Inlet

42 Thank you!