Engineering Designs/Pipe Rehabilitation September 17, 2013 Agenda - - PowerPoint PPT Presentation

Fishbeck, Thompson, Carr & Huber, Inc.

Engineering Designs/Pipe Rehabilitation

September 17, 2013

Agenda

 Issues  Sewer Televising  Types of Rehabilitation Available  Pros/Cons

Issues Facing Us Today

 H2S on Rise – “Green Technology”  Age of Sewers  Changing Regulations  Increasing Costs of Open Cut  Decreasing Revenue

Condition Assessment

 Step #1 – Clean and televise your sewers See what problems you are facing Utilize a contractor that is PACP certified Condition assessment will determine

what type of rehab will work best

PACP

 Pipeline Assessment and Certification

Program

Industry standardization of defects MDEQ adopting coding General Pipe Condition Grades (1-5)

Camera Options

 Panoramo Cameras on front and rear Captures still images Pictures “stitched” together Televise faster than standard CCTV Viewer can pan/tilt to look at defects Great for structural assessment Large data file

Camera Options

 Pan and tilt Standard CCTV Preferred camera for

inflow/infiltration (I/I)

Examples of Defects

 Multiple fractures  Surface spalling  Grade 3

Examples of Defects

 Hole with voids visible  Grade 4

Examples of Defects

 Infiltration

Examples of Defects

 Broken  Grade 5

Examples of Defects

 Defective tap

Rehabilitation Methods

 Step #2 – Select the type of rehab that best fits

your need

Open Cut

 Rehabilitation by

replacement Pros

 Brand new materials  Tight system

Open Cut

Cons

 More costly in urban setting  More area disturbed  Utility/homeowner coordination  Longer to construct

Spot Repairs

 Open cut point repair  Often used in conjunction with CIPP  Repair collapsed or badly damaged section of

pipe prior to lining or another type of rehab

Spot Repairs

Spot Repairs

Spot Repairs

Cured-in-Place Pipe

 CIPP is one of the most common methods

utilized in Michigan

 Line from 4 inches to 120 inches  Rehab sanitary, storm, water, and

pressure pipe

 Rehab non-circular configurations such as

• vals, boxes, bends, and transitional

diameters without digging

 Eliminates inflow and infiltration

Cured-in-Place Pipe

Cured-in-Place Pipe

 CIPP lining is not an option: Existing pipe has severe pipe deflection Collapsed pipe, unless a point repair is

performed

Increase existing pipe capacity

Cured-in-Place Pipe

 Liners are typically non-woven polyester felt or

fiber reinforced fabric

 Forms a close fit within the host pipe  Designed to sustain loads from groundwater,

internal pressure, and soil and traffic

 Liners saturated with resin  Resin includes chemical catalyst to facilitate

curing

 The liner may be chilled for transportation to

maintain stability until installed

Cured-in-Place Pipe

 Installation methods:  Direct inversion  Pulled-in-place  Direct inversion – turn liner inside out, liner

inverts upon itself through the pipe with air or water pressure

Cured-in-Place Pipe

Cured-in-Place Pipe

 Pulled-in-place – run cable through

existing pipe and attach to tube. Carefully pull into place. A hose inverted into the center of the tube inflates the resin- saturated tube with water and holds it tight to the existing pipe.

 Pulled-in-place preferred method where

placement challenges exist.

Cured-in-Place Pipe

 CIPP cured by one of three methods:  Circulating hot water  Steam  UV light  Hot water most common method  UV requires special resins and photo-sensitive

initiators

 Once installed, cured, and cooled, laterals can

be reinstated

Cured-in-Place Pipe

 Direct water inversion with hot water curing

Cured-in-Place Pipe

 Steam curing

Cured-in-Place Pipe

Pros

 Less expensive alternative to open cut  Renews pipe for another 50+ years  Project can be completed in days versus

months Cons

 If not properly grouted and sealed, lined pipe

can still have I/I issues

 Bypass pump or divert flow

Lateral Lining

 Heavy groundwater?  Lateral connections to the mainline a big source

• f infiltration

 Line laterals at the connection up to the

right-of-way or to a cleanout

 If not lining mainline, use a product such as a

T-liner that is manufactured by LMK Technologies which seals the connection and is installed up to a cleanout

 If lining mainline, there is a CIPP liner that has the

lateral liner connected to the mainline liner

Lateral Lining

 T-liner

Spot Lining

 When a pipe is evaluated, it may be determined

that only a few areas are in need of repair or rehabilitation

 More economical to just repair the identified

areas

 Sectional liner that ranges from 3 feet long to

length of repair

Spot Lining

Slip Lining

 Insert a new pipe of a smaller diameter

into a larger, existing pipe

 HDPE or PVC most commonly used  New pipe laid out above ground and pulled

through access pit into the host pipe

 After installation, annular space between

new pipe and host pipe grouted

 Reinstatement of laterals require external

point excavations

Slip Lining

 Segmental slip lining typically used for larger

diameter pipes (Hobas Pipe)

 Segmental liners can be pushed into the host

pipe by hydraulic power or winched into place

Slip Lining

Pros

 Less expensive alternative to open cut  New pipe  Project can be completed in shorter time than

• pen cut

Cons

 Still need point excavations  Grout selection important to ensure proper

loading on liner

 Downsize pipe diameter

Slip Lining

 Project Example  City of Lansing, Grand Avenue in Downtown

Slip Lining

Pipe Bursting

 Pipe bursting replaces existing pipes in same

alignment without physically removing existing pipes

 Static or pneumatic bursting head bursts the

existing pipe and replaces with HDPE, Fusible PVC, composite, clay, and ductile iron

 HDPE pipe most common  Bursting can upsize, such as an 8-inch pipe to a 10-

• r 12-inch

 Reinstatement of laterals require external point

excavations

Pipe Bursting

Pipe Bursting

Pros

 New pipe  Can upsize pipe

Cons

 Still need point excavations  Should not be utilized when close to structure or

• ther utilities

 Utilizes same alignment – check to see if existing

pipe has backfall or sags

 Cannot burst through casings

Grouting

 Primarily used to seal leaks in pipe and laterals  Grout fills the void around the pipe where water is

entering Pros

 Seals leaks  Good fix with proper material selection

Cons

 Not a structural repair  Not a permanent solution  Leaks will travel

Spin Casting

 Spin caster placed in center of pipe and concrete

is centrifugally cast evenly around interior of pipe to predetermined thickness

 Provides waterproofing, sealing, and corrosion

protection for sanitary sewer and storm culverts 30 to 120 inches in diameter

 Can be applied to concrete, clay, metal, and brick

culverts

 Cures in hours so pipe can be returned to service

Spin Casting

Pros

 Lower cost

Cons

 Requires thorough preparation  Bypass pumping required  Only used for certain pipe conditions  Longer curing time

Fold and Form Lining

 Utilizes modified PVC or HDPE that has been

folded into a “U” shape

 Similar installation to pulled-in-place CIPP liners  Uses steam heat to reshape to existing pipe

• nce pulled into place

 Used when existing host pipe can provide

structural support

 No adhesion between liner and host pipe

Fold and Form Lining

 Laterals reinstated by remote cutting, sometimes

point excavation Pros

 Low-cost rehab method

Cons

 Not structural  If sewer has hot flows upstream of liner, liner can

deform or collapse

Spiral Wound Liners

 Liner installed through

manhole or insertion pit

 Liner strips of PVC, steel

reinforced PVC, or HDPE

 Installed from winding

machine

Spiral Wound Liners

 Liner forms water-tight liner  In smaller diameter pipes, liner can be

expanded to fit tight to host pipe

 Or, liner installed to fixed dimension and annular

space grouted

 Laterals reinstated after lining  Grouting done to lock liner in place and transfer

load from host pipe

Spiral Wound Liners

Pros

 Structural pipe renewal  Lower cost

Cons

 Only used for gravity sewers

Conclusion

 Many types of rehabilitation available  CIPP one of better options for H2S Gas

Issues

 Common vs. Specialty  Research  Find best fit for your needs

Fishbeck, Thompson, Carr & Huber, Inc.

Questions?

Contact Info: Deann Falkowski defalkowski@ftch.com (517) 887-4009