Letty Arvide-Gomar, PEsections.weat.org/Presentations/2015CMOM9_LGomar.pdf · Letty Arvide-Gomar,...
Transcript of Letty Arvide-Gomar, PEsections.weat.org/Presentations/2015CMOM9_LGomar.pdf · Letty Arvide-Gomar,...
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Letty Arvide-Gomar, PE
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Outline
DIP History and Applications
Corrosion Issues
Internal Cleaning Technologies
Rehabilitation Options
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DIP History and Applications
Corrosion Issues
Internal Cleaning Technologies
Rehabilitation Options
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DIP history dates back to the early 1800s
1st CIP Horizontal,
Molded
1st CIP Vertical,
Centrifugal
Hot Dip Bituminous
Lining/ Coating
1st Cement-Mortar Lining
1st DIP
Ceramic Epoxy Lining
1816 1850 1860 1922 1955 1990
DI replaced CI
in 50’s and 60’s
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Typical applications of DIP in sewer
• Gravity and pressurized systems
• Collection systems, lift stations, and treatment plants
• High groundwater table
• Deep excavations
• Unique applications
– Above water lines
– Replacing VCP
– Inverted siphons
– River and bridge crossings
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DIP provides unique benefits for gravity sewer applications
• Long service life, durable
• High strength
– Traffic, deep bury, surge pressures
• Behaves as flexible conduit
• Resistant to differential settlement and seismic events
• Allows less inflow/infiltration
• Cost competitive
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DIP History and Applications
Corrosion Issues
Internal Cleaning Technologies
Rehabilitation Options
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(typically
1 mm thick)
Air
Wastewater
Acid
ic
Condensate
H2S Entering Air
Oxygen Entering Water
Water Level
Pipe
Wall
Slime
Layer
Pipe Wall Oxidation
How corrosion occurs in pipes
Dissolution of Sulfide
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Microbiologically-induced corrosion (MIC) cycle
1. Sulfate (SO4)
2. Dissolved Sulfide (H2S)
3. Hydrogen Sulfide Gas
(H2S)
4. Sulfuric Acid (H2SO4)
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Rate of corrosion is affected by wastewater in the collection system
• Low DO promotes anaerobic bacteria and sulfide generation
• High temperature increases microbial growth rate
• Low pH favors hydrogen sulfide gas (H2S)
• Low velocity increases solids deposition
• Turbulence promotes hydrogen sulfide release
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Interior pipe linings offer abrasion resistance
• Design for velocities greater than 2 fps
• Apply ceramic epoxy interior pipe linings
– Tnemec Series 431 Perma-Shield
– Protecto 401
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Tuberculation buildup in DIP reduces pipe diameter
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Tuberculation in DI sewer pipe increases friction and reduces capacity
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DIP History and Applications
Corrosion Issues
Internal Cleaning Technologies
Rehabilitation Options
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Typical cleaning technologies may not remove tuberculation
• High-pressure water jetting (4,000 and 10,000 psi)
– equally distributed
– point-focus
– rotating
– flushing
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Robust mechanical cleaning methods remove tuberculation but can damage pipe
• Cutters, milling machines, and chain knockers/ spinners
– Water pressure driven
– Designed to align within pipe
– Debris suction downstream
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High pressure water cleaning
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Spinner/chain knocker cleaning
Before After
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DIP History and Applications
Corrosion Issues
Internal Cleaning Technologies
Rehabilitation Options
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Pipe rehabilitation provides many benefits
1. Structural restoration
2. Reduction of Inflow and Infiltration (I/I)
3. Reduced O&M
4. Maximize benefit of existing asset
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Pipe Replacement Pipe Rehabilitation Point Repair
Microtunneling Cured-in-Place Pipe
(CIPP) Structural Sleeves
Pipe Jacking Sliplining Joint Seals
Horizontal Directional
Drilling (HDD)
Chemical Grouting/Flood
Grouting CIPP
Pipe Ramming Fold & Formed/ Formed
Reformed Joint Grouting
Impact Moling Spiral Wound Carbon Fiber
Auger Boring Grout-in-Place
Liners/Panel Liners
Pipe Bursting Sprayed
Pipe Reaming Carbon Fiber
Pipe Rehab/Replacement Methods
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Cured-in-Place Pipe (CIPP) for DI pipe
Applications
• 6” to 120” gravity sewer
• Thermosetting resins
• Hot water, steam, UV curing
• I/I elimination
• Structural restoration
Benefits
• Manhole installation*
• Navigates minor bends
• Minimal capacity reduction
• Can include carbon fiber
Challenges
• Pre-cleaning required
• Bypass pumping required
• Access every 1000 ft
*Depends on size to remove cone of manhole
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CIPP Animation
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Ultraviolet light CIPP (UV-CIPP) for DI pipe
Applications • 6” to 48” gravity sewers
• I/I elimination
• Structural restoration
Benefits • No water/steam for curing
• Fast curing time (10 ft/min)
• Stronger than traditional CIPP
• Pre-cure CCTV inspection
Challenges • Bypass pumping required
• Access every 1,000 ft
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UV-CIPP Animation
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Pipe Bursting/Splitting for DI pipe
Applications
• 4” to 54” diameter
• Gravity and pressure applications
• Uses roller blade cutters for non-fracturable pipe
Benefits
• Upsize diameter
• Added capacity
• I/I elimination
• Long design life
Challenges
• Access every 1,500 ft
• Bypass pumping required
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Pipe splitting specifically designed for DI pipe
• Blade cutting wheel/roller configuration
• Split host pipe instead of ripping or tearing
• Requires less power than other static systems
• Clean process that protects damage of product pipe
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Pipe Bursting Animation
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Sliplining for DI pipe
Applications
• 8” to 60” diameter
• Gravity and pressure applications
Benefits
• Structural stability
• I/I elimination
• Long design life
Challenges
• Reduces pipe diameter
• Access every 1,500 ft
• Bypass pumping required
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Sliplining for DI pipe
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Aged DIP causes collection system deficiencies
• Rehabilitation techniques
– CIPP and UV-CIPP
– Pipe Splitting
– Sliplining
• Replacement with new pipe
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Summary