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Triton Lining Systems LLC. The City of Sac City, Sac City Iowa, Water Distribution Pipe In-Situ Rehabilitation July 2012. Project Details. 1,129’ x 6” cast iron water main 1,563’ x 4” cast iron water main Installed – 1940’s, 1970’s, 1990’s Properties affected – 41 homes, 105 residents

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Triton lining systems llc

Triton Lining Systems LLC.

The City of Sac City, Sac City Iowa, Water Distribution Pipe In-Situ Rehabilitation

July 2012


Project details

Project Details

1,129’ x 6” cast iron water main

1,563’ x 4” cast iron water main

Installed – 1940’s, 1970’s, 1990’s

Properties affected – 41 homes, 105 residents

Subdivision - Oak Hill Drive

Problem – Severe discolored water complaints


The problem cause

The Problem / Cause

The conveyed water interacted with the cast iron, causing severe tuberculation build up, internal corrosion, loss of hydraulic efficiency, loss of carrying capacity, degradation of water quality & pipe integrity


Attempted remedies

Attempted Remedies

The system was ‘looped’ – the problem got worse

Super chlorination of the entire water system (break

point chlorination) for 30 days - helped short term

but the problem returned

Hydrant flushing increased – occasionally made the

problem worse

Direction of water flow changed – no effect

Supplied customers in the effected area with water filters

- helped but didn’t fix the problem


The search for a solution

The Search for a Solution

Contacted Iowa Rural Water Association

Contacted American Water Works Association

Talked with vendors

All resources had no new ideas other than replacing the

mains

Started searching the internet for ideas


Potential solutions

Potential Solutions

1. Temporary fix: Furnish the homes with a high end filtration system - Cost approx. $1,000.00/home ($41,000 total). Filters will last 10-15 years with cleaning annually but does not fix the problem

2. Semi-permanent: Pig or swab the lines - this would not fix the problem just delay it’s return. Associated issues - plugged service lines, plugged water heaters, residue in the pipes. Cost - $12,925.00

3. Long term/semi-permanent fix: Rehabilitate the pipe in place - a longer lasting solution (50 year design life), medium cost but permanent elimination of problem

4. Permanent Solution: Replace the main – high cost


Narrowing the options

Narrowing the Options

Main Replacement

Pro’s

- Permanent Fix

- City Crews familiar with

process

Con’s

- 2 year duration

- Cost

- Cost

- Cost

Main Rehabilitation

Pro’s

- Less Cost

- Speed of installation

  • - No Engineering fees

  • - Less social disruption

    Con’s

    - Unfamiliar to City crews

  • - 1st in the State of Iowa to use this technology


The chosen solution

The Chosen Solution

City personnel searched for an appropriate technology that would deal with the problems, while offering a long term, cost effective solution

They found and employed Triton Lining Systems to rehabilitate the piping system and eliminate all the problems associated with it


Planning

Planning

The City & Triton met to discuss the project

The project area was walked, all excavation locations

identified & marked, temporary water system mapped

out, proposed working sequence planned, responsibilities

determined & the final price agreed


Working partners a novel approach

Working Partners a Novel Approach

The City & Triton formed an excellent working relationship where City personnel were utilized to undertake the functions of the project they were equipped for and accustomed to doing, while Triton performed the actual cleaning & lining of the pipes

This scenario enabled the project to be complete in approx. 16 weeks with minimal social disruption and at a saving of over $1,575,000 compared to traditional remove and replace


Work area bypass plan

Work Area & Bypass Plan


The rehabilitation 9 step process

The Rehabilitation 9 Step Process

  • Pipe Location / Access – City Personnel

  • Bypass – City Personnel

  • Excavation – City Personnel

  • 4. Isolation – City Personnel

  • Cleaning – Triton

  • Inspection (Pre lining) – Triton

  • Lining – Triton

  • Inspection (Post lining) – Triton

  • Re Connection / Disinfection – City Personnel


Pipe location access

Pipe Location / Access

Excavation locations were pre determined by Triton, utility locates were organized and performed by the City

Road cut permits were obtained prior to construction


Bypass

Bypass

An above ground bypass system was installed to feed water to all properties affected by the construction

This meant customers were only affected for a very short time during the set up and removal of the bypass system


Excavation

Excavation

Wherever possible, excavations / access openings were made at existing fittings (valves, tees, fire hydrants, bends etc.)

This enabled the opportunity to upgrade the entire system


Isolation

Isolation valves that only affected the pipes within the project area were identified

Valves were checked for operation and complete shut down prior to construction

Isolation


Triton lining systems llc

The Pipe Prior to Cleaning


Pipe cleaning

Pipe Cleaning

Pipe scrapers were pulled through the line several times to loosen any tuberculation and buildup, this was done with the additional use of water


Triton lining systems llc

Plunging / Swabbing

After scraping, plungers were pulled through the line several times to remove the loose debris and any remaining liquids

Foam swabs were then washed through with water

to remove any remaining

debris


Triton lining systems llc

Swabbing

Finally, foam swabs were blown through the pipe with compressed air to remove fine particles and dry the pipe


Triton lining systems llc

The Pipe After Cleaning & Drying


Cctv inspection

CCTV Inspection

The cleaned pipe was then cctv inspected for verification and effectiveness of the cleaning


Inspection pre lining

Inspection (Pre Lining)

The purpose of the pre lining inspection is verify the effectiveness of the cleaning and identify any potential problems such as:

Un clean pipe

Un known valves

Bends

Standing or running water (leaking services)

Over poured lead joints (lead fish)

Repair sections / open joints / clamps

Low service connections

Obstructions


The lining process

The Lining Process


Control systems

Control Systems

Computerized metering and monitoring ensure quality and repeatability of applied linings

A hard copy print out records all pertinent information and allows for verification of lining parameters


The pipe after lining

The Pipe After Lining

The rehabilitated pipe will never suffer from any of the problems it had prior to the process

The lining has an AWWARf design life of over 50 years


Lined pipe showing service connection

Lined Pipe(Showing service connection)

The Triton In-Situ spray lining process doesn’t block service connections


Post lining inspection

Post Lining Inspection

The cured lining was inspected via CCTV to ensure lining quality


Re connection

Re Connection

The City then reconnected all pipe work and checked the couplings under pressure


Disinfection

Disinfection

Following the pressure testing of the new pipe and fittings the City disinfected / chlorinated the pipes in accordance with local and AWWA standards

Once the bacteriological samples had passed they reconnected the properties back to the main, removed the bypass, back filled the excavations and reinstated the surface


Results

Results

Upon completion of the project fire flows were restored, the pipe has long term corrosion protection, chlorine residual is maintained, discoloured water complaints ceased, the problems will never return and customers are happy

Additional benefit - saving $1,575,000.00


Project responsibilities summary

Project Responsibilities Summary

City Personnel

Utility locates

Bypass installation

Excavation

Pipe removal

Pipe reconnection

Backfill

Surface reinstatement

Bypass removal

Triton

Pipe cleaning

Post cleaning cctv inspection

Pipe spray lining

Post lining cctv inspection

(City personnel gave assistance

to Triton with the above)


Triton lining systems llc

Triton Lining Systems LLC.PO Box 1476 Carefree, AZ. 85377Tel: 407 928 9339The City of Sac City302 East Main Street, PO Box 37Sac City, Iowa 50583Tel: 712 662 7593


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