Water & Waste Water Applications
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In 2013, Peter Morgan from Rhino Linings Australasia Head Office gave a highly successful presentation on the advantages of polyurethane and pure polyurea to fellow and leading industry members of the Australian Corrosion Association.
POLYURETHANE ELASTOMERIC COATINGS FOR MAJOR INFRASTRUCTURE
Peter explained what polyurethane is, the advantages of using it, including how to select the right product for the required application, whether that be for drinking water tank linings, industrial tank liners, thickener tanks, channel linings, ponds, dams or secondary containment applications.
He also went through case studies of typical applications for both elastomeric polyurethane and pure polyurea coatings.
Peter’s presentation was well received resulting in the creation of valuable networking opportunities and stronger brand awareness for future business relationships.
We thought we would share his presentation with you in an effort to provide a greater understanding of Rhino Linings approved applicator capabilities and our premium protective coating systems.
For more information on Rhino Linings products and capabilities, or if you are looking for your nearest Rhino approved applicator, contact head office by emailing email@example.com or phone +61 7 5585 7000 to speak with your Rhino Linings State Sales Manager.
We look forward to answering any questions you may have.
Rhino Linings – the experts when it comes to bund lining and waterproofing solutions
When it comes to bund lining and waterproofing, do you have issues with moving concrete substrates, liquid seepage, EPA bunding regulations or just a need to further protect your floors, landings, car parks and concrete tanks?
Rhino Linings can provide superior spray applied protective solutions for all bund lining and waterproofing requirements.
Spray applied and seamless, a Rhino Linings waterproofing membranes totally eliminate potential weaknesses associated with other “joined” membrane products.
With the ability to bond to virtually any surface and the ability to transcend multiple substrates – the possibilities are truly endless.
With Rhino Linings products being a spray-applied polyurethane or pure polyurea, there are many advantages versus other products including:
- The products flexibility: Polyurethanes and polyureas move with your substrate and will not crack warp or peel.
- Cost Saving: Being spray applied to any thickness in one application, costly down time is significantly reduced compared to sheet lining and high build paint products ultimately saving you money.
- Instant Curing: Products are virtually instant curing so can be sprayed at any angle to totally encompass your application or were overhead coverage is required.
Rhino Linings is the manufacturer of the application equipment and of the products used. This places us in a prime position to provide answers to your various requirements when it comes to waterproofing, containment, protection from vehicular traffic, impact, abrasion and corrosion from our suite of products, which are all designed to perform in differing environments.
Rhino Linings products are environmentally friendly. They are solvent free, contain no V.O.C’s and even conform with stringent USA EPA regulations.
Additionally, select Rhino coating products have been certified for use in potable water applications and are AQIS accepted.
The use of Spray Applied Protective Coatings for WWTP Facilities is Increasing.
The Rise of Polyurethane Protective Coatings for Waste Water Infrastructure
Wastewater and treatment plants are subjected to intense and sustained chemical and water exposure that leads to the rapid degeneration of unprotected materials.
Exposed concrete in treatment plants is subject to erosion, and the deterioration of lime and other soluble compounds can jeopardise containment creating a hazardous risk to human health and damage to the surrounding natural environment.
Rhino Linings’ range of tailored solutions for treatment plants are an effective way to neutralise potential leakage and prevent concrete becoming compromised.
RhinoGuard 2195, RhinoChem 2170 and Rhino Pure Polyurea have been successfully utilised in a large number of Water Treatment Plants (WTP), Waste Water Treatment Plants (WWTP) and Sewage Treatment Plants (STP) systems throughout Australia.
The chemical, abrasion and corrosion resistant properties of Rhino Linings’ products assist in the prevention of concrete attack and erosion to help ensure the plant works to its optimum level with minimum maintenance and shutdown.
Rhino Linings assisted the Bendigo Sewage Treatment Plant storage reservoir where leaks had developed due to cracks forming in the floor. The STP walls were also subjected to effluent gases and chemical rich moisture placing additional risk on the facility’s integrity.
The solution was to cover the cracks and coat the concrete above the water line with RhinoGuard 2195 hybrid polyurethane .
With minimal interruption to the plant’s operation, Rhino Linings was able to restore the facility and provide enhanced protection against future breaches.
Rhino Linings was selected as the premium option for the plant due the the fast turn around that is possible using our products. All Rhino formulations have a gel time of 10 – 25 seconds and are tack free within minutes which reduce expensive downtime.
As with any application for corrosion, the protective coating system applied to concrete must demonstrate excellent adhesion and have a bond strength that exceeds the tensile strength of the concrete.
All Rhino Linings are high build (2mm to unlimited thickness) and exhibit excellent elongation, remain flexible year after year, adhere tenaciously and remain extremely durable in even the harshest environments.
Rhino Linings has a solution to meet the even the toughest challenge whether it’s protection from the corrosive characteristics of wastewater, safeguarding concrete from de-ionized water or shielding substrate from rust, corrosion and pitting.
From solvent-based coatings to no VOC’s 100% solids based coating, let Rhino Linings help you find a premium protective solution to protect your concrete substrate.
Water and Wastewater Coatings & Polyurethane / Pure Polyurea Performance Testing
Whatever the linings system used in water and wastewater coatings applications, all have to withstand aggressive chemical substances, abrasion, corrosion, and in addition, provide a good level of impermeability. That being said, the success and longevity of any coating system utilised in this area ultimately depends on the stress levels it can tolerate.
To determine the performance of a polyurethane / pure polyurea coating system within the water and wastewater industry, there are a number of tests that can be carried out by testing and analytical services. For example the Australian Water Quality Centre test products that come in contact with drinking water, this standard is known as AS/NZS 4020. (Note: Ensure you use the very latest version when considering Potable Water Approval.)
However, it is important to remember that conditions in a laboratory are not the same as those in the field especially where protection from chemical substances are required. Normally when testing for chemical resistance a sample of the coating is immersed into the chemical being tested. There are times when this is not possible, that is why it is recommended that prior to the full application of any coating material that a test be carried out under real conditions, this will help determine the performance of the coating system especially when it comes to abrasion and chemical resistance. This is where Standard AS3894 Site Testing of Protective Coatings is implemented.
When it comes to protective coatings such as epoxies, polyurethanes and pure polyureas, water and wastewater coatings performance tests can include, but are not limited to:
- Abrasion Resistance – ASTM D4060
- Taber Abrasion Test is where a sample of the product is rotated under a specific weight (1kg) against a grinding wheel (CS17 or CS18) for a defined number of revolutions (1000 cycles). The sample is evaluated by measuring the weight of the sample before and after the test, the more abrasion resistant the coating is the lower the reported weight loss.
- Adhesion – AS3894 Site Testing of Protective Coatings
- The Adhesion of a protective coating system to the substrate is deemed a good indicator of the coatings ability to resist corrosion signifying longevity of the coating. The better the adhesion the longer the coating lasts, it should also be noted that durability of the lining can also be governed by the thickness of coating.
- Cathodic Disbondment – ASTM G95
- Cathodic disbondment is one measure of the undercutting resistance of a coating/lining system. Linings with better cathodic disbondment resistance have better corrosion resistance and greater longevity.
- Chemical Resistance
- Chemical resistance tests are carried out specific to the application required. A swatch of the coating is submersed into a sample of chemical, if this cannot be done tests are devised which simulate as close as possible the actual conditions.
- Flexibility – ASTM D522
- Flexibility is a good indicator of a coating/lining’s ability to withstand the cracking, disbanding, or other mechanical damage of the coating/lining that can occur.
- Impact Resistance – ASTM G14
- Impact resistance test method represents the coatings ability to withstand damage to a direct impact with another object, this methods help predict the lining performance and resistance to damage
- Water Absorption – ASTM D570
- Polyurethanes are susceptible to water absorption during its life of water and temperature exposure, this can lead to degradation, and failure of the lining, however there are certain levels that are within the acceptable range.
Some of the above U.S. based tests are included in the AS/NZ 4858 “Wet Area Membranes” which gives further indication of a coatings performance.
Factors that Affect a Coatings Performance
The performance of any coating/lining system depends on many variables, such as surface preparation, film thickness, temperature, cathodic protection, flexibility, impact resistance and so on, other factor that need to be taken into account that can affect the performance of a coating include:
- The design
- Surface preparation
- Surface profile
- Coating type
- Coating thickness
- Weather conditions
When selecting a coating system, it is imperative that you consider these performance measures in order to make the best choice. When it comes to corrosion resistance in water and wastewater coatings applications it is important to be preemptive, so understand what your objectives are, and know what long-term outcomes you require otherwise your company could end up spending a lot more than liked.
Innovative spray applied seamless coatings for the water and wastewater industry.
Rhino Linings® continues to be a market leader in providing innovative protective coating solutions especially when it comes to infrastructure. For the last couple of years Rhino has been paying particular attention to the water and wastewater industry and successfully providing innovative solutions for clients within this sector.
Rhino Linings® prides itself on its ability to offer long-term, cost effective protective spray applied polyurethane and pure polyurea solutions. Our portfolio has been developing considerably by offering customised solutions for stakeholders of large industrial, mining, water and wastewater projects.
The industry is starting to move away from epoxy solutions as this system is not able to provide the flexibility and extended lifespan that polyureas and polyurethanes provide. Another advantage of using Rhino spray applied products are:
- Rapid curing
- Good elongation properties
- Excellent corrosion and chemical resistance
- Impermeable membrane
Sewer Pump Pits
With out proper protection concrete sewer pump pits can erode and degrade rather quickly due to gas attack above the high water mark. Rhino Linings® provides a total “solution” encompassing short term and long-term goals of the project for restoration and long term protection.
Waste Water Treatment Plants
Rhino Linings® chemical resistant Polyurethane and Pure Polyurea provides excellent resistance to acidic attack, with its high bond strength to concrete and abrasion resistant flexible properties it is the perfect solution for use in continuously submerged corrosive environments.
Water Channel and Leachate Pond Linings
Rhino Linings® polyurethane spray systems are perfect for lining failed water channels. Lightweight and durable application equipment mean that remote locations and difficult terrain proved no problem for our product technicians. With just one application of our remarkable elastomer and the utilisation of geotextile, the integrity of any channel will be restored effectively preventing further loss of valuable water and increase the transfer flow rate considerably. Rhino Linings® also offers a spray applied membrane for storage ponds.
Internal Pipe Spray System
Rhino’s innovation extends to the design of the RhinoPro Internal Pipe Spray System. This system has been designed specifically for pipes which require special protection for the internal transfer of materials including water, wastewater, sewerage, various chemicals and oil. Spray applied with Polyurethane or Pure Polyurea, the corrosion and impact resistant seamless surface provides superior chemical resistance on internal pipe surfaces, increases flow efficiency of pipes, and reduces gas attack.
Water and Waste Water Infrastructure Rehabilitation Service Includes:
- Sewerage pump pits,
- Waste Water Treatment Plants
- Potable water tanks
- Panel Tanks
- Concrete Tanks