Asset Management Planning for Pipe Renewal Peter Kraft Treated Water Planning

PIPE FOOTAGE YEARS PROBLEM

HOW MUCH? Spun Cast Iron Pit Cast Iron WHERE? Grey Cast Iron Ductile Iron (Macro)(Micro) PROBLEM Life Cycle & Statistical ModelingRisk Modeling

Years All Pipe Pipe Cohorts Pipe Footage (mi) PIT CI SP CI CA DI PVC Years Footage Pipe PROBLEM: How Much?

CATEGORIESInstallation Dates 100% Life Expectancy 50% Life Expectancy 10% Life Expectancy Pit Cast Iron1890 – yrs125 yrs150 yrs Spun Cast Iron1940 – yrs88 yrs100 yrs Spun Cast Iron w/ Leadite Joint 1940 – yrs58 yrs65 yrs Grey Cast Iron yrs88 yrs100 yrs Cement Asbestos 1955 – yrs72 yrs80 yrs Ductile Iron1965 – Present 80 yrs90 yrs100 yrs PVC1975 – Present 80 yrs103 yrs125 yrs Steel1925 – Present 50 yrs63 yrs75 yrs Pipe Cohorts Years Pipe Footage (mi) PIT CI SP CI CA DI PVC PROBLEM: How Much?

Years Combined Life Expectancy Projection Planned 2020 Current 2011 Percentage of Total System % 2% 3% % Distribution System SOLUTION: How Much?

RISK = Likelihood of Failure (LOF) X Consequence of Failure (COF) High COF High LOF Low COF Low LOF Highest Risk Lowest Risk SOLUTION: Which Pipe?

Consequence of Failure SENSITIVE CUSTOMERS2010 PAVING STREET MORATORIUMPOPULATION DENSITYHIGHWAY FLOODINGNUMBER OF TAPS PER PIPE AGE MATERIAL Likelihood of Failure PRESSUREBREAKS JOINT TYPE RAIL INTERSECTION SOLUTION: Which Pipe?

MILES RISK LEVEL Distribution Replacement Model Risk Results SOLUTION: Which Pipe?

MAIN_ RISK = 1224 BREAKS = 2 INSTALL = 1950 MATERIAL = CI NUM TAPS = 25 CONFLICT = 2010 CITY PAVING BENEFIT: Pipe Renewal Selection

Sensitive Customer: Hospice PIPE AGE: 86 Years Old (1) BREAK: Jan 11 th 2001 PRESSURE: psi LENGTH: 584 ft BENEFIT: Identifying Vulnerability

BENEFIT: Pro-active Planning & Coordination

Asset Management Planning Process ENGINEERING  Institutional Knowledge & Input  Corrosion Section – ongoing assessment of leaks  ARG – maintenance of GIS distribution system O&M  Field Knowledge & Input  Leak Detection  Condition Assessment  R&R Project Work IT  EAMS Data Tracking & Integration  Ongoing upkeep of enterprise databases PUBLIC AFFAIRS  Institutional Knowledge & Input  Sensitive Customer Identification & Tracking  Input for risk modeling regarding social consequences  Communication w/ customers about aging system and rate increase PLANNING  Institutional Knowledge & Input  Long Term Renewal Planning  Life-Cycle Modeling  Risk Modeling  Annual R&R Candidate Selection FINANCE  Cost accounting for breaks as well as R&R projects  Financial Modeling for long term planning - i.e. bond rating, rate increase, revenue stability) BENEFIT: Interdivisional Effort

QUESTIONS?