WATER MAIN CLEANING - LGNSW Butler_Ice pigging... · Cleaning Frequency % Silt Removal Flushing...
Transcript of WATER MAIN CLEANING - LGNSW Butler_Ice pigging... · Cleaning Frequency % Silt Removal Flushing...
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WATER MAIN CLEANING Presentation by
Alan Butler
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Introduction
• Why we clean water mains
• What’s in the pipes
• Cleaning techniques
• Our project update
• Videos
• Questions
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Why do we clean Water Mains?
• Drinking Water Management Systems
• Public Health
• Customer Expectations
• Smarter Ways of working
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What's in the Pipes?
• Other than Water…….
• Iron
• Manganese
• BioFilm
• Sediments
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How can we clean Water Mains?
• Trunk, Transfer & Reticulation Mains
• Flushing
• Air Scouring
• Foam Pigging
• Ice Pigging
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Flushing
• Advantages • Easy • Low set up costs • Fixes the problem • Limitations • 0.75m/sec (1.5 – 2.0m/sec preferred) • Large volume of water wasted • Can stir up other areas • Short duration fix • Customer Impact time
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Air Scouring
• Advantages • Widely available • Low set up costs
• Limitations • Customer Impact time • Potential pipe damage • Large volume of water wasted
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Foam Pigging
• Advantages
• Fixes the problem
• Average cleaning technique
• Limitations • Launcher & Catcher required • Large volume of water wasted • Customer Impact time • Lost Pigs
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Ice Pigging
• Advantages • Quick and easy
• Cleans the main very efficiently
• Cost effective
• No large volumes of water required
• Limitations • Perception
• Waste Route
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Review & Selection
• Facts
• Experiences
• Costs
• Environment
• Sustainability
• Customer Expectation
• Public Perception
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The Cost
Table 1: Cleaning Method Cost comparison (Based on 100mm dia main 1000m long)
Labour/Plant $ Materials
$
Cleaning
Frequency
% Silt Removal
Flushing
Based on 30min
per hydrant x 1
person
$233
Total
N/A
$ $233
Every 6 months 30%
Sponge Pigging
Based on 2 days
labour x 3 people
$2592
Total
$3500
Launcher / catcher
& sponge pigs
$6092
Every 5 years 95%
Ice Pigging
Based on 3 hours
shutdown & ice
pigging
$324
Total
$2000
$2324
Every 8 years 95%
Given the frequency differences the below shows a cost per annum of each method.
Flushing Sponge Pigging Ice Pigging
$466 $1218.40 $290.50
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Project Delivery Update
• WSC Year 3 of Ice Pigging • 2013 72.6Km of water main
were cleaned in 113 insertions in 5 weeks
• 2014 81.4Km of water main cleaned in 121 insertions in 7 weeks
• 2015 We have planned to clean 89.7Km of water main cleaned in 145 insertions in 6-8 weeks
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Project Delivery Update
• Detailed plans
• Street Schedules
• Interactive Maps
• Customer Notifications
• 10 Tonnes each day
• Up to 12 insertions
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Project Delivery Update
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Conclusion
• Ice Pigging is a highly effective, straightforward no-dig technique, faster and less disruptive to the customer, uses less water and is more cost effective than the other cleaning techniques.
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Ice Pigging Videos
How Does it work?
The Cleaning Power of Ice
Navigating Bends
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WATER MAIN CLEANING – Ice Pigging
QUESTIONS? Thank you