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

7/11/2012 1

Thomas Gossiaux, PE (AECOM) Matt Raysin, PE (GCDC-WWS) Dave Barnas, PE (AECOM) Ed Tharp, PE (AECOM) Michigan Water Environment Association 2012 Annual Conference Boyne Mountain Resort

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

7/11/2012 2

• 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.

Project Background Why Rehab?

7/11/2012 3

Why Rehab? Why Rehab?

7/11/2012 4

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

7/11/2012 5

Pipe Comparison

RCP CIPP (composite) CIPP (fiber/felt) Sliplining (Hobas)

Design Flow 61 MGD 61 MGD 61 MGD 61 MGD Design Slope 0.05% 0.05% 0.05% 0.05% Manning's Roughness (n) 0.013 0.010 0.010 0.0105 Nominal ID 72” 69.2” 67.8” 64” 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’

7/11/2012 6

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

7/11/2012 7

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

Felt Layers Carbon Fiber Host Pipe Plastic Layer Sewage Flow

7/11/2012 8 iPlus Composite™

Slide courtesy of:

Liner Structural Member

7/11/2012 9

Preparation for Lining - Level Site Preparation for Lining - Mobilize Equipment

Inversion Structure Frac Tanks Liner Brake Boilers

7/11/2012 10

Preparation for Lining - Layout Liner Lining Operations - Begin Inversion

7/11/2012 11

Lining Operation Begin Wet-out Lining Operation - Wet-out

7/11/2012 12

Lining Operation - End of Wet-out Lining Operation - End of Wet-out

7/11/2012 13

Lining Operation - End Inversion

* Photo is not from Genesee County Project

Lining Operation - Curing Liner

7/11/2012 14

Lining Operations - Cut Ends Finished Product!

7/11/2012 15

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

7/11/2012 16

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.

7/11/2012 17

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

7/11/2012 18

Comments? Questions?