Collection Systems are a critical part of Wastewater Infrastructure. The conveyance of sanitary sewer to the treatment plant must be completed efficiently and with no damage to property and the environment in general. Much of our existing pipelines, manholes, and lift stations were constructed many years ago and are starting to reach the end of their life cycle. This presentation covers only assessment, rehabilitation, and repair methods for gravity sewer systems. It was a 30 minute presetnation that I gave at an RMSAWWA/RMWEA PWO Seminar and consists of mostly pictures.
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Rehabilitation and Repair of Sanitary Sewer Collection Systems
1. PWO Seminar
August 7, 2014
Collection
Systems
Discussion
Zachary B. Collins, PE, CWP, LEED AP, CDT
2. Introduction
About Your Speaker
Education and Professional Credentials
Work History
Networking and Volunteering
Family and Free Time
Presentation Topics
What are the problems?
How do we assess the problems?
What are the solutions?
What are the results?
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
3. Collection Systems
What are the problems?
Rainfall induced Inflow and Infiltration
Reduction in capacity
Increased treatment Costs
Blockages
Property Damage
Sanitary Sewer Overflows
Money
Being proactive has many unknowns
Being reactive is expensive
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
4. Collection Systems
What does the EPA Say?
“Sanitary sewer collection systems are designed to remove
wastewater from homes and other buildings and convey it to a
wastewater treatment plant. The collection system is a critical
element in the successful performance of the wastewater
treatment process. EPA estimates that collection systems in the U.S.
have a total replacement value between $1 and $2 trillion. Under
certain conditions, poorly designed, built, managed, operated,
and/or maintained systems can pose risks to public health, the
environment, or both. These risks arise from sanitary sewer overflows
(SSOs) from the collection system or by compromised performance
of the wastewater treatment plant. Effective and continuous
management, operation, and maintenance, as well as ensuring
adequate capacity and rehabilitation when necessary, are critical
to maintaining collection system capacity and performance while
extending the life of the system.” (EPA’s : Guide For Evaluating
Capacity, Management, Operation, And Maintenance Programs
At Sanitary Sewer Collection Systems)
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
5. Assessment of Pipes
Closed Camera Video Inspection
Smoke Testing
Dyed Water Testing
Air Testing
Mandrel Testing
Allowable Leakage Testing
Flow Monitoring
Hydraulic Modeling
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
8. Collection Systems
Dyed Water Testing
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
9. Air Testing
Collection Systems
4 psi start pressure with less than 0.6 drop
Testing time depends on diameter
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
10. Rehabilitation and Repair of
Sanitary Sewer Mains
Jet Balling / Pressure Washing / Root Cutting
Pipe Liners
Cure in Place Pipe
PVC fold-n-form liner
HDPE slipliner
Spot Repairs
Shot-crete
Joint Sealing
Service Connection Rehabilitation
High Velocity Protection
Pipe Replacement
Directional Drilling
Open Excavation
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
11. Collection Systems
Jet Balling, Power Washing, &
Root Cutting
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
14. Assessment of Manholes
Visual Inspection
Ring, Cover, and Grade Rings
Access Hole and Steps
Bench and Channels
Pipe Connections and Invert Finish
Base, Barrels, and Risers
Field Testing
Vacuum Testing
Allowable Leakage Test
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
15. Collection Systems
Ring, Cover, and Grade Rings
Access Space
Inflow and Structural Integrity
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
16. Access Hole and Steps
Steps or no steps?
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
17. Collection Systems
Benches and Channels
Channel Geometry, Bench Drainage, etc.
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
18. Collection Systems
Pipe Connections and Invert
Grouting
1-2” and smooth grouting for easy flow
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
19. Collection Systems
Base, Barrel, and Risers
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
20. Vaccum Testing
Collection Systems
Minimum 10” Hg start pressure
Less than 1” drop in 1 minute
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
21. Collection Systems
Rehabilitation and Repair of
Manholes
High velocity protection
Structural Repairs
Interior Lining
Partial or Full Replacement
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
22. Collection Systems
High Velocity Protection
Incoming pipe at High Grade and/or
sharp change in alignment
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
23. Structural Repair
Combination of
Grout/Concrete
patching and a spray-on
or inserted liner
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
24. Interior Lining
Collection Systems
Concrete/Grouting, Fiberglass, Plastic, etc.
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
25. Collection Systems
Partial or Full Replacement
When the previous design or construction
was incorrect or the structure or pipe is just
too deteriorated to rehabilitate…CALL the
ENGINEER!
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
26. Conclusion and Questions
Pipe Assessment and Rehabilitation
Manhole Assessment and Rehabilitation
Questions?
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT