charter township of waterford oakland county, michigan...ice pigging harnesses the characteristics...
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Charter Township of Waterford
Oakland County, Michigan
Waterford
• 75,000 Population• 26,000+ Customer Accounts• 360 Miles of Water Main• 19 Production Wells• 2 Elevated and 1 Ground Storage Tanks• 12 Iron Filtration Plants• 355 Miles of Sanitary Sewer• 63 Sewage Lift Stations• 15 Township Buildings• 5 Township Cemeteries• 230 Vehicle Fleet
Waterford Township DPW Assets
Project Background• 2013 Pump Station
Rehabilitation
11 Pump Stations were
rehabilitated 2013-2016
• Bypass PumpingFlow was bypassed directly into forcemain. Constant flow at low velocity
• Sediment accumulatedLow velocity lead to accumulation of sediment in force mains.
• Design Standards Not MetNew pumps were notperforming to design standards
Cleaning force main pipes reduces operational costs:
•Asset managementPreventative maintenance extends the useful life of pipes
•Chemical demandReduce chemicals needed to battle Hydrogen Sulfide Issues – in turn leads to less customer complaints
•Pumping costsCan significantly increase flow or discharge rate
Why?
Sediments
Flow
Odor
Issues
Customer
complaints
Associated problems:
Traditional Cleaning Techniques
Cleaning devices:Pigs Swabs
• Incompatible with pipe bends and fittings.
• Requires Excavation to launch and receive pigs
• Customer service interruptions
Operational problems:
A patented innovative sustainable pipe cleaning technology to improve water quality and asset management
What is Ice Pigging?
How does it work?
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
What Ice Pigging Can and Cannot Do:
Can:• Remove sediment, bio-film, and debris
• Be pumped in and out of hydrants
• Clean between 1-2 miles/day
• Clean up to 18 inch diameter pipes (larger possible)
• Safely clean all types of pipes, included coated/lined pipes
What Ice Pigging Can and Cannot Do:
Cannot:
• Remove heavy corrosion and tubercles
• Remove hard water deposits
• It is not a rehabilitation method
What is the Ice Pig?
Potable water typically coming from the utility
Food grade salt is added - Typically 5%
Chlorine for disinfection (customer request)
NSF certified
Ice Pigging
How it Works
Insert – hydrant or 2” tap
Discharge – hydrant or 2” tap
Isolate – valve off
Waterford Sanitary Sewage System
Findings
Observations• Biggest Gains where velocity <2 fps
• Minimal disturbance
• Operational Involvement is Critical
• No digs required where built-in bypasses
