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Cleaning Mains with IcePaul Treloar
Utility Service Group
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Knowledge of a new technology
The benefits
Inspiration/Confidence to use the technology
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An award winning innovative sustainable, advanced pipe
cleaning technology to improve water quality and asset
management
Developed by the University of Bristol England
Utility Service Group is Sole rights holder
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Ice Pigging harnesses the
characteristics of a semi-
solid material
An ice pig is a semi-solid material that can be pumped like a liquid ….....
but behaves like a solid once the pig is formed in the pipe
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Food grade, fine table salt (NaCl)
NSF approved
Harmless to customer supply
Additional chlorine may be added as disinfectant
To maintain the correct consistency a
freezing point depressant is used
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• Pipe bends, changes in diameter or butterfly valves
• Excavation to launch
and receive pigs
• Interruptions to
supply
• Disinfection required
post clean
Operational LimitationsPigs
Swabs
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Flushing/Air Scour/Jet Washing Operational Limitations
• High Water Usage 50% more water than ice pigging
• Inefficient - ice pigging 1000 x more effective
• Low flow rates -length of hose etc.
• Over aggressive -can damage pipe lining
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Efficient rapid and environmentally friendly
Combines operational benefits of flushing with the impact of solid pigging
Ice Slurry injected through existing hydrants
System pressure pushes ice through complex water networks
Suitable for pipes of all size and material
Exceptionally low risk
Produces quantifiable results
Harmless to public
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Iron
Manganese
Sediments
Biofilms
Fats, Oils, Greases (FOG)
Grit
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Ice Pigging in Practice
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Insertion & Discharge
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Discharge to Ground Written State Approval Only
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What Comes Out?
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1) Sample from
front of pig
2) Sample from
middle of pig as
it carries the
sediment
3) Sample at end
of pig where ice
is clean
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Before After
Cast Iron?
Before
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Photos of the one exposed section and the
attached Strain Gauges and Temperature Sensors
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Winner of Innovation Prize by Water UK
2010 Winner IWA Innovation Award: Global Grand Prizewinner
2014 ACEC/Vermont Grand Award Winner
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26 States
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Over 300 miles of pipe cleaned worldwide
88 Projects in US
100+ Miles across 26 States
Maximum length cleaned in one pass – 2.25 mi
2”-18” diameter pipe cleaned, testing up to 30”
Removed over 700 lbs./mile of sediment
Used in Sewer force mains & sewer siphons
Potable & raw water
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World Renown
Award winning
Cost-effective method of pipe cleaning
Offers real cost savings
Rapid, environmentally friendly,
efficient solution
Exceptionally low risk
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Contact Information:Paul TreloarCell: [email protected]
www.utilityservice.com
or
USG’s New York State Water System Consultants:Roger Linder and Carol Smalley
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Approximate Cost of Ice Pigging using 10T Rig
Max/Day (FT) $/FT
Max/Day (FT) $/FT
Max/Day (FT) $/FT
Max/Day (FT) $/FT
Max/Day (FT) $/FT
6" 8" 10" 12" 16"
PVC/AC/HDPE 12000 $1.00 7000 $1.71 4500 $2.67 3000 $4.00 2600 $4.62
Ductile Iron 9300 $1.29 5280 $2.27 3300 $3.64 2300 $5.22 1700 $7.06
Cast Iron Unlined 6300 $1.90 3500 $3.43 2200 $5.45 1500 $8.00 850 $14.12
What does it cost?
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Stokes County Public WorksDate: August 27th- 29th
2012
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Problem: Water system 30 years
old Build up of Manganese
and iron Discolored water
complaints Heavy sediment build up Insufficient water
storage for other cleaning techniques
Flushing not an option
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ResultsBefore After
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“Water quality has been greatly increased and customer complaints have all but disappeared”Mark Delehant – Director of Public Works Stokes County NC