increase reliability of restoration sewer asset

1/ SEWER LININGS & DEALING WITH

SUBSTRATES IN POOR CONDITION

2/ INCREASE RELIABILITY OF

RESTORATION

Nick Subotsch – Technical Director, Peerless Industrial Systems

www.peerlessindustrialsystems.com 1

AIM & SCOPE

www.peerlessindustrialsystems.com

1/ Protect and extend the life

of assets.

2/ To rehabilitate/repair

damaged assets.

2

Overview

• Sewers and associated structures are

commonly concrete

• Concrete is susceptible to corrosion

• Waste predominantly suffers from Sulfur

related corrosion



1/ Assets can degrade very

quickly in sewers.

2/ Increased Urbanisation will

accelerate degradation.


All assets are subject to

degradation by

corrosion.


Any asset conveying or

tranferring waste is

susceptible to corrosion


Typical processes

in sewers and

related assets

Corrosion Protection - Historically

1/ Epoxy – 2 pack coatings and linings

2/ PVC – Polyvinyl Chloride preformed plastic

3/ PE & HDPE – Polyethylene & High Density

Polyethylene

4/ Cements, Polymer Cements or Aluminates –

Lime & related reactive cement bases




Dating back over 40 years,

typically applied up to 1mm

thick over existing concrete

surfaces



Epoxy mortars are prepared

using resin & aggregate to

reinstate surfaces by trowel

over existing damaged surfaces

2/ PVC – Polyvinyl Chloride preformed

plastic


Shaped or formed and welded the

PVC liner can be placed and then

backfilled to take the shape of

asset, in this case a manhole

2/ PVC – Polyvinyl Chloride preformed

plastic


Clean and simple shape that

is smooth and clean

3/ PE & HDPE – Polyethylene & High

Density Polyethylene


Offers greater chemical resistance to a

range of chemicals, and maintains

flexibility – does not become brittle like

previously employed PVC & site installed

3/ PE & HDPE – Polyethylene & High

Density Polyethylene


Can be prefabricated and

installed on site as

components

4/ Cements, Polymer Cements or

Aluminates – Lime & related reactive

cement bases


Quickly installed without

welding or forming

Reinstate lost asset with

minimal skill

4/ Cements, Polymer Cements or

Aluminates – Lime & related reactive

cement bases


Placement is often carried out in

one day & limits downtime of asset

Very cost effective and affordable

Problems with Epoxy


New concrete imperfections must

be considered when planning

protection – often not


Problems with Epoxy

Coating results in blow holes & pin holes

# volcanic shaped & described as

“BLOWING” or “OUTGASING”

Never considered at budget stage & the

fault of picking lowest price over best

technical review


Problems with PVC

Termination of PVC break away,

often because over time the PVC

becomes brittle


Problems with PVC

Terminating older PVC ?

Poor terminations at

construction forced

maintenance makes long life

difficult to guarantee


Problems with HDPE

Installed as sections, backfilled

with cement. Weld integrity ?

Same as PVC, join to existing

or new pipe provides risk for

long term integrity


Problems with HDPE

Preformed sections dropped into

place and backfilled are now

considered maintenance concerns

at all terminations, no guarantee or

predictability of life


Problems with Cement

Installed without the guarantee of

long life, sacrificial properties and

need to replace in years is

accepted so monitoring essential

Summary Comparison

Introducing new ULTRA


Ease of

Application

Effects of

Corrosive

Conditions

High

Thickness if

required

Low Internal

Stress

Ability to

Patch

Traditional Epoxy X X X X

PVC X X X

PE & HDPE X X X

Cement based Mortars X X X X

Modern Epoxy Type (Ultra) X X X X X

24

Modern Epoxy Type ULTRA


Unique Features:

High loading of TiO2 – non talc, barytes, carbonate fillers = superior

abrasion, UV, chemical resistance

Solvent free = safe to use, no shrinkage, no waste – can be used in

thin applications to paint or very thick – suitable to gap and hole fill

Sprayable with conventional airless = easy and quick to install

Versatile in use and application = applied by brush, roller, spray

Ultra Build = apply like cement types to full build immediately

25


Can be applied directly over

reinforcement and thoroughly

encapsulate from corrosive

conditions




Protecting assets is easy and

quick, long life without

imperfections and downtime


Simple spray over very rough

concrete to show how easy

buildup is achieved


After spraying, can be trowelled

off to even surface and ensure

full coverage before a mist

spray coat to provide final finish


Offers speed and integrity over

the modern preformed plastics

like HDPE that must be welded

and terminated


Complexity of plastics offers

new construction issues,

especially when variations or

corrections are required


Retrofitting any ladder or fitting

internally compromises the integrity

of perfect lining & leaks behind may

never be known until catastrophic

failure of structural support


Using ULTRA, damaged assets

can very easily be made good –

back to original condition with

life expectancy like a “NEW”

Asset


Using

Modern Epoxy Type

ULTRA


– has the benefit of utilizing the existing

structure & minimizing disruptions to

operations & customers.

– allows for life of asset to be extended at

minimum costs.

– structural integrity can be restored

without excavation. 35



– need to evaluate risks over time

– locations

– inspections required

– budget for works

– on going monitoring

DECISIONS ?

36

increase reliability of restoration sewer asset

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