Summary Project Background Why Rehab? & Alternatives Bid - PDF document

7/11/2012 Michigan Water Environment Association 2012 Annual Conference Boyne Mountain Resort Thomas Gossiaux, PE (AECOM) Matt Raysin, PE (GCDC-WWS) Dave Barnas, PE (AECOM) Ed Tharp, PE (AECOM) June 25, 2012 Summary  Project Background  Why Rehab? & Alternatives Bid  Project Concerns  What is CIPP Lining?  Construction – Setup, Lining/Curing, Demob  Time Criteria  Project Hiccups 1

7/11/2012 Project Background  72-inch RCP sanitary sewer interceptor installed to collect several aging sanitary sewer pump station and service additional area.  Installed interceptor had high infiltration and evidence of structural failure, which was not solved through grouting.  Alternatives were bid to fix this issue. Why Rehab? 2

7/11/2012 Why Rehab? Why Rehab? 3

7/11/2012 Proposed Alternatives Alternative Low Bid High Bid CIPP (Composite) Lining $4,720,220 $5,561,870 CIPP (Fiber/Felt) Lining $4,055,140 $5,790,420 Slip lining $5,519,810 $9,605,350 Parallel Tunnel $6,578,700 (only bid) *CIPP Composite Liner was $665,080 more than CIPP (Fiber/Felt) Liner, but selected due to increased strength and reduced thickness. Benefits of CIPP Composite  Bid was less expensive than slip-lining and parallel tunnel  Lighter/thinner and stronger than traditional felt CIPP Liner  Reduces infiltration and exfiltration (no pipe joints)  Protect pipes from corrosion  Minimal traffic disruption/Social costs vs. open-cut  Increase flow capacity 4

7/11/2012 Pipe Comparison CIPP CIPP Sliplining RCP (composite) (fiber/felt) (Hobas) Design Flow 61 MGD 61 MGD 61 MGD 61 MGD Design Slope 0.05% 0.05% 0.05% 0.05% Manning's 0.013 0.010 0.010 0.0105 Roughness (n) 72” 69.2” 67.8” 64” Nominal ID Flow Capacity (Q) 61.2 MGD 71.6 MGD 67.6 MGD 55 MGD Project Specific Concerns  Interceptor Size:  72-inch Interceptor (not a typical liner installation)  Run Lengths:  1,200 to 1,400 feet per run  Depth:  50-feet  Water Table:  20+ feet of hydrostatic pressure  Constructability Issues:  Weight and stretching liner  Over the hole ‘wet - out’ 5

7/11/2012 What is CIPP?  Cured In Place Pipe  Thermosetting resin is injected into a felt tube  The tube is inserted into an existing host pipeline by water inversion  The CIPP tube is cured using hot water  Ends are cut and the final product is a fully-functional pipe-within-a- pipe Slide courtesy of: Water Inversion 6

7/11/2012 Liner Technical Information  Liner Thickness: ~1.4” (approx. 33 mills)  “Over the hole” wetout  Additional structural component  Carbon Fiber  Added strength with less thickness and weight  Designed for Class 5 RCP equivalent strength  Cured at ~180 F for about 12 hours Liner Layers Host Pipe Carbon Fiber Felt Layers Plastic Layer Sewage Flow 7

7/11/2012 Liner Structural Member iPlus Composite ™ Slide courtesy of: 8

7/11/2012 Preparation for Lining - Level Site Preparation for Lining - Mobilize Equipment Boilers Liner Brake Frac Tanks Inversion Structure 9

7/11/2012 Preparation for Lining - Layout Liner Lining Operations - Begin Inversion 10

7/11/2012 Lining Operation Begin Wet-out Lining Operation - Wet-out 11

7/11/2012 Lining Operation - End of Wet-out Lining Operation - End of Wet-out 12

7/11/2012 Lining Operation - End Inversion * Photo is not from Genesee County Project Lining Operation - Curing Liner 13

7/11/2012 Lining Operations - Cut Ends Finished Product! 14

7/11/2012 Time Criteria  Prep For Lining:  Level site around manhole: 4 hours per inversion MH  Install water line: 4 hours  Clean/TV: 2-4 hours (more if additional grouting is necessary)  Grout major leaks (if necessary): 1-2 days  End Seals: ~ 4 hours  Equipment Set-up: 36 hours Total Prep Time: ~ 3 - 5 days (2- 12 hour crews per day) Time Criteria (cont.)  Lining:  Wet-out/Inversion: 1-day (over the hole ‘wetout’)  Cure: 1-day  Cut ends/clean edges: 1-day Total Lining Time: ~ 3 days Total Time Including Prep: ~ 6-7 days 15

7/11/2012 Time Criteria (cont.)  Demob/Cleanup:  Tear down equipment: 1 day Total Demob Time: ~ 1 days Total Time Including Prep and demob: ~ 7 to 8 days Project Hiccups  Curing issue in first liner length was due to water behind pipe.  Some non-fully cured pipe bubbles required special resin to be injected to create a seal. Structural strength was not compromised.  Finished pipe had some wrinkles  If in flow path, ground down and sealed. 16

7/11/2012 Bubbles and Wrinkles Summary  Project Background  Why Rehab? & Alternatives Bid  Project Concerns  What is CIPP Lining?  Construction – Setup, Lining/Curing, Demob  Time Criteria  Project Hiccups 17

7/11/2012 Comments? Questions? 18