ANSI A300 Part 9 - ISA Texas

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Texas Chapter ISA Annual ConferenceSeptember 28 2012ANSI A300 Part 9:in a utility world Michael SultanDavey Resource Group

Reality BitesPuget Sound Energy, 1998 – 2007 34,000 tree-caused outages Trees were primary cause of unplannedservice interruptions 95% due to tree failureFrom Arboriculture & Urban Forestry July 2011. 37(4): 147 - 151

Key Points What is ANSI A300 (Part 9)?How does it relate to IVM?How does it apply to utilities?

ANSI Standard A300 Tree RiskAssessment - Part 9a. Tree Structure Assessment Tree StructureTree RiskResidual Risk

ANSI Standard A300 Tree RiskAssessment - Best Management Practices

What about Tree Structure?Defects Architecture Loads

Failure occurs when load exceeds strength

Types of Failures: Entire tree failure (uprooting) Trunk failure Branch failure

Loads on Trees:Gravity Self weight Rain, snow, ice Other (e.g. climbers, rigging)Wind Force (dynamic)Direction

Forces affecting trees ShearTensionFMDTorsionCompression

What is RISK?Probability Consequences

Likelihood of Failure and Impacting a TargetLikelihoodofFailureImminentLikelihood of Impacting TargetVery LowUnlikelyLowMediumHighSomewhatLikelyLikelyVery obableUnlikelyUnlikelyUnlikelyUnlikely- Table 1 -

Risk Rating Matrix (utilizing results of table 1)LikelihoodofFailure andImpactConsequences of FailureNegligibleMinorSignificantSevereVery LowLowLow- Table 2 -

ANSI Standard A300 Integrated VegetationManagement - Part 7a. Electric Utility Rights-of-way Danger TreeHazard TreeTree Pruning and Removal

Trees and tree branches with thepotential to affect utility facilities shouldbe monitored for risk, and pruned orremoved as appropriate (refer to ANSIA300 Part 9, Tree Risk Assessment).

Can we predict what will happen?Species Specific Failure Data Wind and Storm Data Site and Forest Conditions

What does it all mean?Management v MaintenanceManagementCostMaintenanceTime

C OM M U N I C A T E EDUCA T E

What we’ve covered ANSI A300 (Part 9)How it relates to IVM?How it applies to utilities?

Michael SultanDavey Resource Group214 . 605 . 2660Michael.Sultan@davey.com

ANSI A300 Part 9: A nce 28 2012. Reality Bites Puget Sound Energy, 1998 – 2007 34,000 tree-caused outages Trees were primary cause of unplanned service interruptions 95% due to tree failure From Arboriculture & Urban Forestry July 2011. 37(4): 147 - 151 . Key Points What is ANSI A300 (Part 9)? How does it relate to IVM? How does it apply to utilities? ANSI Standard A300 Tree Risk Assessment .

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