Seattle Pipe Replacement Seattle Pipe Replacement PrecedencePrecedence

Main & Service WaterlinesMain & Service Waterlines

Prepared by: Myron BasdenPrepared by: Myron Basden

Steven Flowers Steven Flowers

Jenny Pearson Jenny Pearson

Yuriy Stryzheus Yuriy Stryzheus

Kerry SullivanKerry Sullivan

IntroductionIntroduction

General look at Seattle’s waterline General look at Seattle’s waterline network.network.

Factor’s affecting pipe’s vulnerability.Factor’s affecting pipe’s vulnerability.

Suggestions on pipe replacement or Suggestions on pipe replacement or maintenance.maintenance.

Seattle’s pipe networkSeattle’s pipe network

Factors Affecting Pipe’s Factors Affecting Pipe’s VulnerabilityVulnerability

Soil corrosivitySoil corrosivity

Age of a pipeAge of a pipe

Pipe’s MaterialPipe’s Material

Pipe Replacement or MaintenancePipe Replacement or Maintenance

Level of Urgency:Level of Urgency:

LOW – 1 factor existsLOW – 1 factor exists

MEDIUM – 2 factors existMEDIUM – 2 factors exist

HIGH – 3 factors existHIGH – 3 factors exist

Pipe Condition Based on 1 FactorPipe Condition Based on 1 Factor

Low Vulnerability

Corrosive SoilAge:

pre-1944Pipe Material:

Cast Ironor or

Pipe Condition Based on 1 FactorPipe Condition Based on 1 Factor

Pipe Condition Based on 2 FactorsPipe Condition Based on 2 Factors

Medium Vulnerability

Soil Corrosivityand Age

Age and Pipe Material

Pipe Material andSoil Corrosivity

or or

Pipe Condition Based on 2 FactorsPipe Condition Based on 2 Factors

Pipe Condition Based on 3 FactorsPipe Condition Based on 3 Factors

HighVulnerability

Age &Soil Corrosivity &

Pipe Material

Pipe Condition Based on 3 FactorsPipe Condition Based on 3 Factors

ConclusionConclusion

Table 2. Summary of Results

    Main Lines Service Lines

    Length (miles) % of totalNumber of Segments % of total

Red - High Risk        

  OBC 8.28 0.5 0 0.00

  Subtotal 8.28 0.5 0 0.00

Orange - Medium Risk        

  CO 1.09 0.1 351 0.21

  OB 760.03 44.2 7 0.00

  CB 5.25 0.3 0 0.00

  Subtotal 766.37 44.5 358 0.21

Yellow - Low Risk        

  C 16.84 1.0 498 0.30

  B 521.40 30.3 16 0.01

  O 65.26 3.8 90347 53.96

  Subtotal 603.49 35.1 90861 54.27

           

Total % at Risk 1378.14 80.1 91219 54.48

Other Pipes 342.14 19.9 76203 45.52

TOTALS 1720.28 100.0 167422 100.00

Key: O = installed before 1944 (old), B = cast iron pipe (brittle), C = corrosive soil

Questions?Questions?