This section includes: Anoverview of the product types and ...€¦ · Guidelines will be provided...
Transcript of This section includes: Anoverview of the product types and ...€¦ · Guidelines will be provided...
This section includes:• An overview of the product types and liner classes.• Details on the codes of practice and product
standards being developed.
These presentations are for individual reference only, do not reproduce materials or publish without permission from WSAA.
The next section is an update on the Codes of Practice and Product Standards.
Codes and standards development fits into sub‐project 1.
There are currently no standards by which to assess the quality of liners, this project will produce:
• 2 Codes of Practice.• 4 Product Standards.
The following slides provide a quick overview of the types of products that we’re testing as part of this project.
This is to make sure everyone is on the same page to assist the explanations coming up from our University partners.
Two main installation methods:• On the left – a resin impregnated tube is pulled
through by a winch, expanded to the host pipe, then cured.
• On the right – a resin impregnated tube in pushed through the host pipe using an inversion process (via air or water), then cured.
Site photos of the CIPP liners being installed:• On the left – A CIPP liner being pulled through the
host pipe prior to expansion (field trial in Perth).• On the right – A CIPP liner being inverted through
the host pipe (in‐yard trial in Sydney).
Spray lining ‐ a machine is working from left to right with the spray head used to apply thin layers of lining material.
Multiple passes can be used to make the liner thicker.
On the left – Spray lining machine spay head.
On the right – First pass of the spray lining machine.
Geopolymers and CACs are generally applied in the same way:• Spray and then trowel finish.• Nominal 25mm thickness.
Similar because:• Both cement based products.• Bother applied via a spray.• Same liner class.
Different because:• CAC and Geopolymers are different based on their
chemical make up (this is the high level answer ‐see University of Sydney section for additional
details).
There’s a lot of information on this slide, it’s really provided for later reference.
The key things to remember at this stage are:• There are four classes of liner (ISO 11295)• Class A is a structural liner;• Class D is non‐structural; and• Classes B & C are in between.
We’re finding that there are liners that don’t always fit neatly into one class: for example a liner may not have enough inherent ring stiffness to be self supporting (bottom orange box), but may have a long term pressure rating greater than the maximum
operating pressure (top right green box).
Purpose ‐ Set out standard requirements to ensure a high quality of work and long term performance.
Status: First draft completed and reviewed – second draft underway.
The Water Linings Code of Practice will be in the form of a standalone manual.• The official name is: Manual for selection and
application of cured‐in‐place pipe (CIPP) and spray liners for use in water pipe
The Wastewater Linings Code of Practice will be in the form of an amendment to WSAA’s existing
protective coatings manual.• WSA 201 Manual for Selection and
Application of Protective Coatings.
The items listed on this slide are an abridged list of the documents’ contents – going to focus on the highlighted sections.
Service Life – this essentially the length of time the liner is expected to last. This section covers when a liner has reached it end of life.• Water – when the maintenance costs are
uneconomical or it becomes unsafe.• Wastewater – when acid has permeated the liner
or it becomes unsafe.
Product selection – we’re including an overview of the product selection process, but we’re aiming to point people towards the decision tools, the overview includes:• Performance requirements.• Testing.
• Initial lining and liner maintenance.
Wastewater – conditions for the application of liners in sewers are very important. Currently sewers are classed as aggressive environments for corrosion, but we think a further breakdown into corrosion categories is required, this will ensure products are fit‐for‐purpose, and allow more products into low corrosion environments. Additional information can be found in the presentationsfrom the University of Sydney.
Surface preparation is a key element of a good liner installation – the codes covers a variety of techniques and requirements.
Note: Preparing the surface for lining can be more time consuming than the lining itself.
Some of the methods are:• Swabbing• Abrasive Blasting• High pressure water• Chain flails• Root cutters
Some examples:• AC pipes are generally fairly easy to clean,
but you have to be careful not to apply too much water pressure and break the pipe.
• Corrosion build up in pipes can be tricky to clean out so ensure a smooth surface for the liner to bond to.
• Acid impacted concrete needs to be removed before applying CACs and Geopolymers.
Transport and storage ‐ particularly of resins, is very important for lining systems – resins not stored properly can start to go hard before the liner gets installed.
Ambient conditions • Water – temperature important here as well,
affects resin cure times, the presence of too much water can be a problem for some liners and must be managed.
• Wastewater – environmental conditions in the sewer affect the choice of liner.
Mixing – many lining systems (both water and
wastewater) have components that are kept separate during transport and require mixing prior to application. Getting this right is very important to ensure liner success.
Thickness – some coatings have specified minimum and/or maximum thickness, another consideration is the service life required can relate to a specified thickness during the design phase.
QC Records – consist of daily inspections reports, ambient conditions, surface preparation undertaken, equipment reports, etc.
Inspection and test methods – Visual inspection, adhesion, temperature, relative humidity, thickness.
Monash University and the University of Sydney are undertaking the materials testing to ensure we know what is important to measure.
UTS is developing sensors – both handheld and using robotics (refer to UTS presentation for additional details).
This section applies to the water products.
This is an area that we have not finalised. Different water companies take different approaches to water quality. As part of developing the codes of practice we want to be able to say if there is anything that should be tested for, over and above water agency requirements.
Following the installation of a new liner repairs and/or new connections may be required.
Guidelines will be provided for how to best approach this based on manufacturer recommendations,experience from lab testing and field trials.
For example, for new tappings for water liners we have found that a sharp drill bit should be used when drilling through the liner to avoid issues – this means that a separate drill bit is often required as one becomes dull drilling through the pipe.
The project is developing one product standard for each product type.
Status: First draft completed and reviewed – second draft underway.
Purpose: • Clear guidance to help manufacturers with the
introduction of new products; • Provide asset managers with confidence that a
product is suitable for its intended use; and• A greater uptake of lining products.
Product Standards are split into two key stages:
• The M stage is the product as manufactured – before any site processing or mixing of components.
• The I stage is the product as installed – this stage looks at the product once it is installed and cured and also includes the installation requirements.
To be able to comply with the standard you need to be able to comply with the requirements of both stages.
“M stage” and “I stage” are terminology that matches the ISO standards (11295 and 11296).
The manufactured stage is all about the component materials, before they are mixed together or installed on site.
The product standards will specify what information needs to be provided by the manufacturers for each product type.
The information requirements are likely to vary from product to product, but will include things like:• Colour – this can sometimes be used to monitor
the quality of mixed ingredients.• Composition – generally proprietary so this will be
limited to the type of material, e.g. resin type,
filler type and curing agent type.• Test methods.• Storage and transportation requirements.• Requirements for fittings.• Min/max wall thickness.• Maximum particle size – to ensure it will
work with the spray nozzle.• Minimum requirements for listing material
properties.
Ultimately the product standard will list the minimum information requirements for each product.
The installed stage is all about the materials from when they are mixed together on site through to final installation and curing.
The product standards will specify what information needs to be provided by the manufacturers for each product type.
The information requirements are likely to vary from product to product, but will include things like:
Installation instructions• Mixing ratios.• Temperature requirements.
• Curing times.• Requirements for ambient conditions.• Gap spanning ability.• Surface preparation.• Finishing requirements, e.g. trowelling.
Mechanical properties (of the installed liner)• Factors to consider: loading external,
internal, transient pressures.• Service temperature requirements.• Testing requirements.• Reconnection of existing services.• Adhesion to surface.• Compressive strength.• Tensile yield stress.• Hardness.• Flexibility.
Ultimately the product standard will list the minimum information requirements for each product.
If the Codes of Practice and Product Standards seem like a lot to take in (they are) fear not, we are also creating decision tools that will use this data and help select appropriate liners.
Additional information on the decision tools can be found in the presentations by Ben Shannon (water decision tools) and Marjorie Valix (wastewater decision tools).
45