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James J. PaluchAssistant Superintendent /Collection System Ops

Joint Meeting of Essex & Union Counties, Elizabeth, NJ

Tina WolffSr. Project Engineer

Malcolm Pirnie, Inc.Ft. Wayne, IN

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Perspectives on Pipeline RepairThe A,B,C’s Series

Webcast Sub-Committee Members

• Abraham Araya – Seattle, Washington• Thomas Curl – The Woodlands, Texas• Mattie A. Engels – Dallas, Texas• Wes Frye – Nashville, Tennessee• Chris Johnston – Burnaby, British Columbiay• Stephen A. Lipinski – Duluth, Minnesota• John Nelson, Pewaukee, Wisconsin• James J. Paluch – Elizabeth, New Jersey• Tina Wolff – Fort Wayne, Indiana

Existing Sewer Evaluation and Rehabilitation

• WEF Manual of• WEF Manual of Practice FD-6

• ASCE Manuals and Reports on Engineering Practice No. 62No. 62

• 2009, Third Edition

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Chapter 6 –Selection of Sewer Rehabilitation

Methods and Materials• OVERALL CONTENTS

• Introduction & Overview• Rehabilitation Types, Materials, Methods• Pipeline Repair, Replace, Renew (RRR)• Manholes Service Laterals RRR• Manholes, Service Laterals RRR• The Selection Process• Quality Assurance / Quality Control

The A,B,Cs Series

• April 21 2010: Perspectives on Pipeline• April 21, 2010: Perspectives on Pipeline Repair

• July 28, 2010: Perspectives on Pipeline Renewal

• November 2010: Perspectives on Pipeline ReplacementReplacement

• 2011: Manhole RRR, Lateral RRR, Pump Station RRR

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• Rehabilitation – repair, renewal, replacement –i t t t f tis a constant part of sewer management

• Financial limitations forcing “do more with less”• Good technologies being eliminated from the

rehabilitation tool box– Poor applications of technology– Poor definition of conditions– Poor oversight

Owner

Contractor Designer

Manufacturer

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• Complimentary roles of owner, designer, contractor, manufacturercontractor, manufacturer

• Understanding the repair processes• Using a process to identify conditions and

select best repair tool• Using QA/QC to protect the repair g p p

investment

•• Ahmad Habibian, Ph.D, PE,Ahmad Habibian, Ph.D, PE,Bl k & V t h C tiBl k & V t h C tiBlack & Veatch CorporationBlack & Veatch Corporation

-- Designer’s perspectiveDesigner’s perspective-- Understanding the repair Understanding the repair

processprocess-- Effective QA / QCEffective QA / QC

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•• John MorganJohn MorganJohn Morgan,John Morgan,City of IndianapolisCity of Indianapolis

-- Owner’s perspectiveOwner’s perspective

-- Case Study : LongCase Study : Long--term term end rance of Shotcreteend rance of Shotcreteendurance of Shotcrete endurance of Shotcrete

•• Marc Anctil,Marc Anctil,Logiball Inc.Logiball Inc.

-- Manufacturer’s perspectiveManufacturer’s perspective

-- Case Study : Time proven Case Study : Time proven performance of Chemical performance of Chemical ppGrout Grout

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PIPE REPAIR

Ahmad Habibian, Ph.D., P.E.

Agenda• Overview of repair methodsOverview of repair methods• Design considerations• QA/QC considerations• Construction considerations• Cost considerations• Summary

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REHABILIATION

• Maintains service life – O&M– Leakage

• Renews service life– Structural

C it

• Extends service life– Structural

REPAIR RENEWAL REPLACEMENT

Leakage– Structural

– Capacity enhancement

– Leakage– Corrosion

protection

CLEANING

PIPELINE REPAIR TECHNOLOGIES

POINT REPAIR COATINGGROUTINGCLEANING

JETTING

MECHANICAL

Rodding

Drag / BucketMachine

OPEN CUT

SLEEVES

EPOXY

CIPP

INTERNAL

EXTERNAL SHOTCRETE

POINT REPAIR COATINGGROUTING

ROBOTIC

FLOOD GROUTING

Machine

HYDROMECHNICAL

CHEMICAL ROOT CONTROL

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High Pressure Jetting is the Most Frequently Used Sewer Pipe Cleaning Technology

• Pressure: 1,000 to 2,000 psi

• Flow: Up to 80 gpm• Length: 700 ft to 1,000 ft• Types

– Jet onlyJet only– Jet/Vac Combo– High flow

Hydro-mechanical Cleaning

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Repair Sleeves• Man-entry Installationy

– Rubber seal over stainless steel band

– 16” to 216”• Remote Installation

P l th t t d– Polyurethane saturated foam over stainless steel sleeve

– 6” to 54”

CIPP Repair Considerations• Liner size to fit the pipe• Liner thickness• Resin

– Polyester– Vinylester– Epoxy

• Finished product properties• Saturation of felt

C i• Curing process– Steam, water, UV– VOCs

• Installation method– Inversion or pull-in

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ROBOTIC REPAIRS

Internal Grouting• Grout type: Acrylamide or

Urethane• Robotic-controlled

systems for small pipes• Man-entry system for

large pipes• Grout can be washed outGrout can be washed out

if significant I/I is present• Volume of grout needed

depends on the volume of voids behind the pipe

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External Grouting• Grout material

– Cementitious• Portland cement• Micro-fine cement

– Chemical• Used for large pipes

Fill id• Fills voids• Enhances structural

integrity of pipe

Design Considerations• Objective - I/I removal, structural integrity, or

both?• Hydraulic capacity – Does the pipe need

upsizing?• Design standards• Specifications & contract documents

M d– Measurement and payment• Pipe condition• Repair option evaluation

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Pipe ConditionType & frequency of defects (PACP-compliant

inspection)

• O&MO&M– Debris, roots, grease

• Structural– Partially or fully deteriorated conditions– Collapsed or broken pipe

S– Sags – Offset joints

• Location of groundwater table

Repair Option Evaluation • Suitability of the

method to achieve bj ti

• Pipe size – Man entry

objectives• Type of defects• Host pipe material

– Clay– Concrete

– Minimum diameter• History of use• Cost• Constructability• Surface cover

– Asbestos cement– Brick– Cast iron/ ductile iron– PVC or HDPE

Surface cover

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Open Cut versus Trenchless Considerations

• Surface cover– Paved or unpavedp– Water crossings– Highway or RR Crossings

• Pipe depth• Environmental impact• Soil condition• Community / Traffic impact• Contractor availability• Access • Permitting

QA/QC Considerations• On-site inspection during installation• Pre & post CCTV inspection• Pre- & post-CCTV inspection• Criteria for acceptance• Submittals• Liner saturation, curing, sampling & testing• Grout mix & volume control• Contractor’s Qualifications

– Prior project experience– Supervisor/foreman experience and/or

certification

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Construction Considerations• Sequence of operations• Customer outreach• Traffic control• Work hours• Safety considerations• Source of water and method of disposal• Site restorationSite restoration• Documentation

– As-builts– Existing records updates

Contracting Strategies• In-house resources• On-call service contractsOn call service contracts

– Single– Multiple

• Design-Bid-Build• Find & fix• Combination of above strategies• Combination of above strategies

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Cost Considerations• Locality• Availability of contractors• Volume of ongoing work• Size of rehab job• QA/QC requirements• Bypass pumping requirements• Permitting access and traffic control requirements• Permitting, access and traffic control requirements• Warranty requirements

Planning Level Costs

Method CostMethod Cost

Cleaning – collection system pipe $0.1 to 0.3 per ft

Cleaning - Interceptors $1 to $5 per ft

Open cut $5 K and more

Robotic/sleeves $2K and more

CIPP $2K and more

Robotic/epoxy $2K and more

Mechanical rubber seal $1 K and more

Internal grouting $1K and more

External grouting $3K and more

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Concluding Thoughts• Think through your design requirements to avoid

costly problems during and after construction• Establish QA/QC requirements to ensure good• Establish QA/QC requirements to ensure good

workmanship and end product• Allow for more than one method to encourage

competition• Retain on-call contractors for emergency repairs

Utili D i Bid B ild h f t id• Utilize Design-Bid-Build approach for system-wide repairs

• Stay abreast of new developments in the industry

Questions & Answers

Ahmad Habibian Ph D P EAhmad Habibian, Ph.D., P.E.habibiana@bv.com

301-556-4291

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Perspectives On Pipeline RepairJohn Morgan

Assistant AdministratorCit f I di liCity of Indianapolis

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City of Indianapolis, Indiana

• More than 3 000• More than 3,000 miles of sanitary sewer

• 672 miles of combined sewer

• Includes• Includes approximately 65,000 Manholes

Owner Perspective on Pipe Repair

Keys to a SuccessfulKeys to a Successful Repair

1.Problem is fixed.2.Costs are as low as

possible AND see item 1.3.Service life of the repair

meets or exceeded expected life.

And….www.sewerhistory.org

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Avoid Catastrophic Failures

Owner’s Expectations

• Designer (in-house or external)• Designer (in-house or external)– Well versed in the repair methods– Define the problem correctly– Selects the best solution

• Contractor– My project is not “an experiment” (unless it’s free)– My project is not an experiment (unless it s free)– Trained and capable of a quality installation

• Manufacturer– Assists with design and installation – Stands behind the product

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Indianapolis Approach to Repair

• Condition Assessment• Condition Assessment– Pipe condition rated– Ancillary conditions identified

• Repair Method Selection Basis– Pipe conditionp– Environmental conditions– Capacity issues– Cost Effectiveness

Condition Assessments

• Assessments are performed by qualified• Assessments are performed by qualified engineers

• Engineers interact / coordinate with contractors– Establish repair costsp– Assess other variables

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Repair Methods in Tool Box

• Repair• Repair– Point repair– Section lining

• Large repair (Renewal)– Cured-in-place pipe linerp p p– Sliplining– Shotcrete

Building and Maintaining the Tool Box

• Include tools that have been proven to• Include tools that have been proven to work in your system– No tech– Low tech– New tech

• Evaluate success in your system– Product life– Support test results

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Case Study: Large Diameter Sewer Repair with Shotcrete

A mortar or concrete conveyed through a hose and pneumatically projected at a high velocity onto a surface

Sprayed concrete is usually reinforced by conventional steel rods, steel mesh, and/or , ,fibers

25th and Hillside

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1950s Repair Standing the Test of Time

Project Completed in the mid 1950’sProject Completed in the mid 1950 s– Pipe Diameter is 96”– Lined Segments Within Combined Sewer

System– Maintenance here similar to other cities of

i (i l i l i i )our size (i.e. cleaning, televising, etc.)

In a Combined Sewer Environment Indianapolis Views Shotcrete as a 50 Yr

Product

Proof is in the core

5 Cores taken and tested in mid - 20085 Cores taken and tested in mid - 2008All cores clearly indicated bond to substrate

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Note the difference between the host material pipe and shotcreteshotcrete

Minimal to No surface deposition through the years

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Finished Product

Method 1 Application

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Method 2 Application

Method 3 Application

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WEFTEC POSTER

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Specifications First Step in Quality Control

• Specifications require 5 000 psi• Specifications require 5,000 psi• Specifications developed based on

– Indianapolis experience– American Concrete Institute (ACI)

recommendations

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Testing Provides Proof

Owner’s Expectations

Designer (in-house or external)Designer (in-house or external)Well versed in the repair methodsDefine the problem correctlySelects the best solution

ContractorMy project is not “an experiment” (unless it’s free)My project is not an experiment (unless it s free)Trained and capable of a quality installation

ManufacturerAssists with design and installation Stands behind the product

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Pipeline Repair - Owner

John MorganJohn MorganAssistant Administrator

City of Indianapolisjmorgan@indy govjmorgan@indy.gov

Questions ?Questions ?

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• Perspectives on Pipeline Repairs• Chemical Grouting in Collection Systems

• By Marc A Anctil

Chemical GroutingAnother Tool in the Toolbox

Coatings

Chemical

Sectional Lining

Mh to MhLining

Pipe Bursting

SlipliningCoatings

Chemical Grouting

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Manufacturer’s Perspective on Pipeline Repair

Keys to an effective repairKeys to an effective repair1. Proper characterization of the problem2. Designers, owners & contractors that

understand the science / details of the technology

3. Proper equipment 4. Talented and conscientious contractors5. Quality Control / Quality Assurance

Understand the Pipeline Repair Process for Best Results

Pipeline Repair Failures are the result of:Pipeline Repair Failures are the result of:

– Application of technology to inappropriate conditions (Design methodology)

– Inappropriate or incorrect implementation (construction) of repair method (QA/QC)

– Insufficient pre and post inspection / testing– Inappropriate materials (Design specification /

QA/QC)

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Understand the Pipeline Repair Process

Manufacturers are one of the best resources for training and education on pipeline repair processes

– They created the process– They understand the application envelope– They can modify the equipment for specific

applications/conditions

Most Common Sources of Infiltration in Collection Systems

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Groundwater flows easier in soils which have been disturbed, even if the native il h b d f b kfill l i ll i iblsoil has been used for backfill, leaving our collection systems susceptible to

heavy flow of groundwater and even more so after rain events (french drain effect).

Process of Sewer FailureStage 1 Initial defect, but sewer remains held in position by the surrounding soil.

Stage 2 Development of zones of loose ground or voids caused by the loss of ground into the sewer.

Stage 3 Failure of the sewer pipe.

METHODS TO CONTROL LEAKS IN SEWER COLLECTION SYSTEMSPrepared by C.Vipulanandan, Ph.D., P.E. and H. Gurkan Ozgurel (GIGMAT)

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Chemical Grouting• The injection of a multi-component chemical

grout into soil and voids around the pipe, liner and manhole structures to seal the leakand manhole structures to seal the leak, stabilize the ground and control infiltration.

• Significantly reduces ground water infiltration into sewer systems.

• Stabilizes sewer structure backfill and bedding t i l t i i f b kfill fi ithmaterial stopping erosion of backfill fines with

resulting misalignment.• Not a structural repair.

Chemical Grouting• Eliminates exfiltration and cross contamination

from sewers into storm mains and ground waterwater.

• Seals annulus infiltration in lined pipe systems at lateral cut-outs and manholes.

• Does not rely on any type of pipe surface preparation for bonding to be successful as the

l hi d f th t i f thseals are achieved from the exterior of the structures.

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Chemical Grouts Commonly Used in Controlling Infiltration

Manholes Mainlines Laterals connections

Acrylamides

Acrylates

Acrylic resins

U h lUrethane gels *

Urethane foams

* Practical limits in sealing distances from the lateral connections

Possible Chemical Grout Additives

• Latex emulsion/reinforcing agent - increases the compressive and tensile strength shrink controlcompressive and tensile strength- shrink control agent

• Accelerators – speeds up the gel time (urethanes)

• Dichlobenil – inhibits growth of roots into system• Tracer Dye – illustrates proper mixing and travel

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Possible Chemical Grout Additives

• Ethylene glycol – lowers the freezing t t f th d h i ltemperature of the uncured chemicals

• KFe Potassium Ferricyanide - extends gel time (acrylamide &acrylate)

• Ice – stabilizes temperature• Diamataceous earth (filler)

Always verify with grout manufacturer/supplier for Always verify with grout manufacturer/supplier for recommendations and ratios.recommendations and ratios.

Gel Times of the Grouts

Gel times of the grouts are affected by temperature. The colder it is, the longer it takes for the grout to react & vice versa

Standard cup test for gel time verification

Packer /pipe void ex: 1/3 gal

Pump delivery system ex: 3 gpm

for the grout to react & vice versa.

Gel times must also take into consideration the void between the packer and the pipe, the pumping rate along with desired travel distance of the grout.Grout hose

recirculation when necessary

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Chemical Grouting Setup for Joint & Lateral Testing & Sealing

Making it Work for You !Simple Math

• 5000 feet of 8” pipe 3 foot joints (1667 joints)5000 feet of 8 pipe 3 foot joints (1667 joints)• Assume 30 % of joints (500 joints) are leaking at 0.25

gal/min, 6 months out of the year.• Infiltration = 32,850,000 gal of water/year• Assume treatment costs $ 3/1000 gal• Direct annual treatment cost of infiltration in 5000 feet of

pipe $ 98,550 • Assume $ 34 to test & seal 8” joint x 1667 joints = $

56,678 to test & seal 5000 feet of pipe.• ROI= 210 days for treatment cost not including pump

station savings, line cleaning or other associated costs.

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VOID PRESSURE (TEST & GROUT) MONITORING SYSTEM

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A pressure gauge or transducer connected to the sensor diaphragm outlet port (at the packer) will accurately transmit the void pressure and providethe operator and inspector with precious information on what is happening beyond their sight (testingon what is happening beyond their sight (testingand grouting pressures of the void).

Void pressure stable at 6.5 psip

Timer (pressure has been holding 6.5 psi for 36 seconds)

Gallons of grout pumped (effectively sealing lateral connection and 30 feet of the lateral)

Mainline Grouting Preparatory Procedures

• Clean the mainline sewer.R d CCTV i ti f th i li• Record CCTV inspections of the mainline.

• Protruding taps of more than 1" into the mainlinemust be cut back.

• Roots & grease and other debris that prevent the passage or seating of the packers must bep g g premoved .

• Measure the diameter of the pipe.

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Mainline Joint Test & Seal

Packer & camera assembly are winched in tandemPacker & camera assembly are winched in tandem to the joint. Packer is positioned and inflated over the joint. The joint is then air tested as per ASTM F 2304-03 requirements.

Mainline Joint Test & Seal

Chemical grout is pumped until refusal or sufficient back pressure is obtained After the sealing and post test thepressure is obtained. After the sealing and post test, the packer is moved to the next joint where the procedure is repeated. Mainline packers being flow-thru, flow control is normally not an issue as some of the flow is allowed to pass through the center of the packer. If flows are too high, then flow control may be necessary.

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Mainline Chemical Grouting

The packer/pipe void pressures indicate to the operator the pressures at which the grout is being forced out through the defects into the soil. Notice, in this case, the middle picture showing 6.1 psi. This number is the grouting /testing pressure as measured at the packer/pipe void.

The seal is not achieved by the internal grout ring but by the …

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…gelled grout on the exterior that has saturated and sealed the backfill provides a watertight repair and prevents any further

backfill fines from entering the pipe.

Soil saturation with chemical grout prevents groundwater and fines from entering the collection

system, also preventing exfiltration of sewage.

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Staging the GroutFirst attemptIn some cases, it can is

necessary to stage the Second attempt breaking the initial seal and forming a second layer

Third injection breaking through the initial layers until a seal is achieved

y ggrout in order to obtain a seal, as the grout consumption becomes very important, usually caused by large voids behind the structures.

seal is achieved

Mainline Sealing CapabilitiesGrout Packers for elliptical pipes

Grout Packers for Box Culverts

Grout Packers for longitudinal cracks

Mainline Test & Seal Packers available for 6” through 144” pipes.

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ASTM F2414-04

Standard Practice for Sealing Sewer Manholes UsingChemical Grouting

STANDARDS & SPECIFICATIONS

Chemical GroutingASTM 2304-03

Standard Practice for the Rehabilitation of Sewers Using Chemical GroutingASTM 2454-05

St d d P ti f S li L t lStandard Practice for Sealing LateralConnections and Lines from the Mainline SewerSystems by the Lateral Packer Method, UsingChemical GroutingNassco Specification Guidelines

QA/QC• Preparation work (cleaning, cctv, documentation)• Most appropriate grout & grout mixture for the job• Adapt to existing field conditions (gel times grout• Adapt to existing field conditions (gel times, grout

additives, pumping rates, stage grouting, etc.)• Knowledgeable contractor, operator and inspector• Pump the quantity of grout that is needed. That

extra gallon of grout could mean the difference between a permanent vs a temporary repair.

• Pump until “refusal” (predetermined pressure or blow-by by the bladders)

• Good specifications (ASTM, NASSCO)

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QA/QC• Sealing at refusal (blow-by or 8-10 p.s.i.), as

long as the proper technique is used, can be a form of verificationa form of verification.

• Random air testing on the way back to the entry manhole

• CCTV inspection after cleaning (post test & seal)

• CCTV inspection approximately 11 months after completion of work preferably during high ground water tables.

QA/QC• Test 10% of the work approximately 11

months after completion of work (failures will be resealed at no expense to the owner) Ifbe resealed at no expense to the owner). If failure rate is higher than 5% another basin of similar size will be chosen.

• Keep a sealing log of the work (grout mix, gel times, additives and quantities , grouting & testing pressures grout pumped etc)testing pressures, grout pumped, etc)

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Tips for Success !Initial mixing of the grout: 10%, 12 %, 15% by weight ?

Has to take into consideration that under active infiltration dilution, will occur with the first few gallons of grout.dilution, will occur with the first few gallons of grout.

Additives are available for specific conditions (reinforcingagents, catalysts, root inhibitors, fillers). Verify with groutmanufacturer.

Gel time vs pumping rate: The gel time must be long enough for the grout to migrate through the defects and saturate the soil before it gels otherwise it may plug upsaturate the soil before it gels, otherwise it may plug up defects (pathways) of the pipe prematurely.

Stage grouting: May be necessary where outside voids are large and continuous pumping does not provide a seal.

Tips for Success ! continued

Gallons pumped : An attempt should be made to pump ¼ of a gallon of mixed grout per inch pipe diameter for mainline grouting. That extra gallon of grout pumped,mainline grouting. That extra gallon of grout pumped, could make the difference between a temporary and permanent repair. Volume of grout pumped per joint not to exceed ½ gallon per inch diameter without ownersauthorization. Grout pumped over ½ gallon per inchdiameter should be priced as a seperate item to providean incentive to perform the work as required.

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Tips for Success ! continued

Grouting pressure as measured at the void : The pumped grout must fight the groundwater pressure to getout of the pipe and into the soil. If there is noout of the pipe and into the soil. If there is no groundwater present, the rule of thumb is to pump at pressures that would represent the potentialgroundwater table (approximately 1/2 psi per vertical foot of depth above the pipe).

Good Specifications: Standards & specifications areGood Specifications: Standards & specifications are available through ASTM & Nassco (National Association of Sewer Service Companies)

Revisiting the WorkRichard is now with a firm called LCS and won a bid to clean & CCTV lines in Fossambault in 2007. Richard states “Some of these lines were grouted back in the summer of 1986

The municipality of Fossambault sur le Lac (outskirts of Quebec City) had a test & seal grouting project in 1986. The joints had been tested & sealed with a 12% solution of acrylamide

grouted back in the summer of 1986 and are still leak free 21 years later”. There are a few joints where you could still see the faded green (dyed) gel in the joints 21 years later ”.

with a 12% solution of acrylamidegrout. “ We would pump until the grout squirted out past the packer bladders or we saw the gauge go up & hold 15 psi and the groundwater would stop coming in through the joints”, says Richard Thibault (field supervisor for Renovation Aqua in 1986.)

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How long does it last ?The pictures below show a 15 inch rcp pipe that was originally grouted in 1986. These pictures were taken in the summer of 2007 where the water table lies above the crown of the pipe showing no infiltration Residual acrylamide grout can be seen in the joint 21infiltration . Residual acrylamide grout can be seen in the joint 21 years later.

Joints grouted in 1992 in St-Anaclet (Quebec)reinspected in 2007. Residual grout ring from 1992 can be

seen 15 years later & joints are still leak free.

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Sample Costs 2009Chemical Grouting(pipes include testing & sealing) 2009

Low High Average(low & high removed)

Notes

8” pipe x 3’ joints * $ 22/joint $ 75/joint $ 34/ joint

10” pipe x 3’ joints * $ 24 /joint $ 80/joint $ 40/joint

12” pipe x 3’ joints * $ 24/joint $ 85/joint $ 43/joint

Precast manhole 8’ deep x 48” $ 400 $ 1000 $ 770

Brick Manhole 8’ deep x 48” $ 500 $ 1500 $ 1050 Many contractors will performthis work under T&M

8” main x 6” lateral 18” up ** $ 275 $ 590 $ 380

* Prices are for testing all joints within a reach and sealing the joints that fail the test.

** Prices are for testing all lateral connections and sealing the laterals that fail the test within reach. If only performing localised interventions, within reach prices go up. (Unit prices may vary with number of laterals within reach)

This survey is of no statistical significance. It is based on preliminary results compiled from contractors across the USA. Prices differ according to regions & number of contractors performing this kind of work within these regions.

Conclusion

It is expected that city sewer systems in North America will continue to be prone to infiltration problems due to deteriorated joints even though the pipes may remaindeteriorated joints even though the pipes may remain structurally sound.

Chemical grouting has proven to be one of the least expensive remediation alternative for stopping leaks and infiltration.

Chemical Grouting has a 50 year history of sealing leaks.g y y g

The proper application of Chemical Grouting is a proven method of stopping infiltration.

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Thank You !

Marc A Anctil

www.logiball.cominfo@logiball.com

Tel: 1-800-246-5988Fax: 1-418-653-5746

Questions ?

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• Incorporating the multifaceted aspects of the system into the evaluation process will identify the best suited options.

• Understanding the science behind pipe failure helps select the right repair method at the right time.

• Understanding the science behind the repairs can manage the risk of failure; provide solutions when failures do occur.

• Quality Control / Quality Assurance is a key to longQuality Control / Quality Assurance is a key to long lived, cost effective pipe repair.

• Re-inspection / re-testing can prove the longevity of a repair and to support repair programs.

• Leveraging the varied knowledge and experiencesLeveraging the varied knowledge and experiences between owner/designer/contractor/manufacturer brings increased opportunities for all.

• An open channel of communication between the Consultant / Designer, Owner and Manufacturer / Contractor from the inception and planning stages of a project to its construction and eventual rehabilitation p jare critical for project success.

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The A,B,Cs Series

√ April 2010: Perspectives on Pipeline Repair√ April 2010: Perspectives on Pipeline Repair• July 28, 2010: Perspectives on Pipeline

Renewal• November 2010: Perspectives on Pipeline

Replacement2011 M h l RRR L t l RRR P• 2011: Manhole RRR, Lateral RRR, Pump Station RRR

Companion PublicationsExisting Sewer Evaluation and

Spring Book Sale: 10% off until May 31!

Rehabilitation — MOP FD-6, 3rd Edition• click here

Wastewater Collection Systems Management — MOP 7, 6th Edition• click here

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Upcoming Conference

Collection Systems 2010Collection Systems 2010 Collection System Priorities –Balancing Competing Needs

Phoenix, ArizonaJune 13 16 2010June 13 –16, 2010

http://www.wef.org/CollectionSystems/