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
Modern Epoxy Type
ULTRA

Modern Epoxy Type
ULTRA
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
Modern Epoxy Type ULTRA

– 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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