l i f i h i kReplacement Strategies for High Risk Distribution Pipelines

AGA Management of Vintage Distribution Pipelines Workshop

Presented by:

Kevin Dugan; Chief Engineer, Gas Distribution Engineering– VectrenCorporation

Daniel Vetter, P.E.; Project Manager – EN Engineering

September 12, 2011

Agenda

• Scope and Project Study• Scope and Project Study• Replacement Identification/Prioritization and Strategy• Key Benefits

R l t A d P j t D li bl• Regulatory Approved Project Deliverable• Engineering/Construction Standards• Engineering Design Process• Construction Process• Continuous Improvement - Project Selection & Priority• DIMP Implications

Scope and Project Study

• Identify need• Identify need

• Develop internally or enlist consultant• Program development• Presentation – corporate and/or regulatory• Presentation – corporate and/or regulatory• Implementation

• Program length

• Necessary budget

• Timeline

Scope and Project Study

• Personnel needs• Personnel needs• Reporting• Organizational chart• Position descriptions/responsibilities

• Company• Consultants• Contractor

• Standards• Management• Engineering• Construction• Construction

Scope and Project Study

• Communication• Communication• Internal

• Engineering• Construction/operations• Corporate

• External• PUC• Regional government – City township county• Regional government City, township, county• Community & resident notification• Public works• Contractors & consultants

Replacement Identification/

• Identification/Prioritization

Prioritization and Strategy

• Identification/Prioritization• Pipe material (BS/CI & other materials)• Oldest main• Leak rates• Main repairs• Water/environmental problems• Public issues (roadway, safety, etc.)• System network• System network

• Strategy• Groupings or modules• Multi-year planning• Multi year planning• Network ends back to regulators• Size for target project budget

• Customer benefits

Key Benefits

• Customer benefits• Minimize disruption to daily routines• Reduce outside leak calls and no gas calls• Customers will not be impacted by crews digging in

their streets and yards• Long term planning, advanced notification

• Public Safety• Reduce the possibility of an incident• Cut back on above ground meter leakage• Installation of plastic mains, easier to isolate damage• Installation of EFV’s• Installation of EFV s• Less leak repair activity, fewer construction openings

• Reduced risk of injury• Lower restoration (asphalt, concrete, yards)

• General benefits

Key Benefits

• General benefits• Replace pipes that contribute most to system leaks• Service reliability and safety • Workforce efficiency, replacing this pipe based on a

planned schedule• Optimization of capital spending• Replace leak prone materials will also improve

customer satisfactioncustomer satisfaction• Reduce maintenance expenses• Lower level of lost and unaccounted for gas• Distribution Integrity Management Program (“DIMP”)

i trequirements

Regulatory Approved Project

• Replacement program plan

Deliverable

• Replacement program plan• Length of program• Planned mileage• Targeted materials

• Monthly, quarterly, bi-yearly or annual reporting• Budget/expenditures• Mileage• Schedule

• Rate adjustment documentation

• Material

Engineering/Construction Standards

• Material• Main• Services• Fittings

• Tie-ins• Metallic-to-Plastic• Plastic-to-Plastic

• Installation

Engineering/Construction Standards

• Installation• Main

• Location – Parkway, under sidewalk, street, insertion, uprate/upgrade

• Method – Trench, HDD, insertion• Services

• Method – Insert, test and tie-over, direct bury• Meters – move out/relocation• Meters move out/relocation• Size – Residential, commercial, multi-unit

• Annual replacement identification/description

Engineering Design Process – Pre-construction

• Annual replacement identification/description• Segments & Groups/Modules• Documentation – GIS/maps• Database tracking

• System Planning evaluation

• Identify address ranges

• Collect service information

• Field noting and running line

Engineering Design Process – Pre-construction

• Field noting and running line

• Drafting and engineering design

• Cost estimating – main & services

• System operation plan/routine

• Bill of materials

• Construction/bid packetsubmittal

• Receive construction packets

Construction Process

• Receive construction packets• Full year• Flowed

• Plan crew routing/scheduling• House crews• Contractor crews

• Notify affected customers• Order materials• Order materials• Complete main & service installation• Return completed construction packet

• As-builtsS i d• Service records

• Misc. documentation

Engineering Design Process – Post

• As-built information

Engineering Design Process Post-construction

• As-built information• Record in GIS/maps

• Actual cost• Main• Services

•Reporting• Main installed – material & size• Main retired – material & size• Main retired material & size• Services installed• Services retired• Meters moved out/relocated

M i t• Main cost• Service cost

• Re-Implementation of Optimain DS (Decision Support)

Continuous Improvement – Selection / Priority

• Algorithms - Leak history, material type, operation cost • Calculates Risk Score based on Repair /O&M Cost• Use for repair / replace decision and prioritization• Optimain – Source Data Analyzer (SDA is used to search for • Optimain Source Data Analyzer (SDA is used to search for

issues and find pipes with a large number of leaks)

Continuous Improvement – Selection / Priority

• Optimain linked to GIS to gather data & create project boundaries.

Continuous Improvement – Selection / Priority

• Calculates risk base on predicted number of future failures.C dd l t • Can add replacement plan and review repair/replace alternatives

Continuous Improvement – Selection / Priority

• Optimain – Multiple Project Analyzer

• Can be used to review the results of multiple projects

• Can be used to perform batch pcalculations/changes

• Replacement program included in metrics for DIMP

DIMP Implications

• Replacement program included in metrics for DIMP• Identification and selection of pipes with most risk will

consider all material types• Expansion of attributes to include threat types outlined in • Expansion of attributes to include threat types outlined in

DIMP to prioritize projects• Risk Scores will be re-visited on a periodic basis to re-

validate the prioritized list.p

Questions?

Thank You!Thank You!