# Presentation: 777395

## The Evaluation of Pipe Performance and Durability 

**Stewart Burn**
**CSIRO**
**Urban Water Infrastructure**
**Contact **
**Stewart.Burn@csiro.au**

## Research Activity

**CSIRO – 6500 scientists across Australia**
**20+ working specifically on asset management of water systems**
**Water - PARMS**
**Sewers - CARE-S**
**Benefits from our Research**
**Improved Asset Management – Risk Based System**
**Reduced Failures**
**Appropriate service at optimal cost**
**Some return from our investment to invest in further**

## Asset Management Components

## Asset management strategies

**We consider the key Components of an Asset management strategy include**
**A Risk based methodology based on**
**Whole Life Costing methodologies to measure consequences**
**Models for predicting pipe failure**
**Statistical Models**
**Physical/Probabilistic Models**

## Asset management strategies

## PVC Average failure rates (US/Canada)

## PVC Average failure rates (Australia)

**PVC Average failure rates (Australia)**

## Statistical models

**Statistical models**

**Standard failure curves developed for particular material, diameter, length, pressure, soil environment**
**7 Australian water authorities assessed with 50 years plus of data, 17 UK authorities now being assessed - UKWIR**
**Statistical Models Need tuning to each authority**
**Currently seeing if generic curves exist**
**Developing Physical/Probabilistic Models in conjunction with AwwaRf**

## PVC pipes – CSIRO/AwwaRF

- Physical/probabilistic model predicts fracture failures in the field
- Linear Elastic Fracture Mechanics theory used to predict time to brittle fracture from pipe wall defects
- Uncertainty in model variables accounted for using Monte Carlo simulations

## Polyethylene (PE) pipes – CSIRO/AwwaRF

- Increased ductility of current PE materials renders conventional linear elastic fracture mechanics theory invalid
- The historical development of different PE grades adds further complication
- Physical/Probabilistic failure model in progress and is supported by statistical models based on recorded failure data

## Asbestos Cement pipes - CSIRO

- Physical/Probabilistic model predicts degradation and loss of strength in the field
- Failure predicted to occur under critical combined internal pressure and external loading
- Uncertainty in key variables accounted for by Monte Carlo simulation methods

## Cast Iron pipes – CSIRO

- Physical/Probabilistic model predicts corrosion penetration through pipe wall
- Failure predicted to occur under combined internal pressure and external loading at critical corrosion pit depth
- Uncertainty in key variables accounted for by Monte Carlo simulation methods
- Large volumes of historical failure data also allows statistical models to be developed

## Ductile Iron pipes – NRC/CSIRO/AwwaRF

- AwwaRf project in progress in collaboration with National Research Council, Canada
- Will develop service life prediction models for Ductile Iron pipe
- In-situ monitoring of corrosion damage in relation to soil electrochemical properties
- Statistical methods used to extrapolate measured corrosion damage to longer lengths of pipeline
- Physical/Probabilistic model to predict corrosion failure in different soil environments

## Cement Mortar Lining (CML)  CSIRO/AwwaRF

- AwwaRf project in preparation to address the long term performance of Cement Mortar Linings in Cast and Ductile Iron pipes
- Industry and literature surveys to identify field failure modes in CML
- Quantify the interactions between water quality parameters and CML failure
- Develop accelerated test methods for modelling CML degradation
- Physical/Probabilistic model to predict failure under different operating conditions and water quality conditions

## Condition Assessment – Pro-Active assets

- Failure models can be calibrated using non-destructive condition assessment techniques
- Electromagnetic tools available to measure corrosion pit depth in metallic pipes
- Research effort towards the development of condition assessment tools for non-metallics (cement, plastics)

## Sewer Deterioration Models

**Deterioration models developed in EU CARE-S project with 15 partners**
**Models developed for**
**Structural Collapse**
**In/Ex Filtration**
**Blockages**
**Siltation**
**Root intrusion**

## More Information

**More Information**

**CSIRO - Stewart.Burn@csiro.au**
**AwwaRf – Jian Zhang**
**WERF – Roy Ramani**
**CARE-S - Sveinung Saegrov**
**http://www.csiro.au**
**http://www.cmit.csiro.au/research/urbanwater/mouws/**