26 Oct Tackling Major Contamination Risks With Next Generation Coatings
Posted at 10:24 in Uncategorized by Rene Willemsen
As my role at Adler & Allan suggests, I am a firm believer that prevention is better than cure, and with this in mind, I am pleased to be able to talk you through another one of Adler & Allan’s many resilience projects.
We were recently contacted by SSE to perform a survey on their Petersfield Avenue site, which houses two vulnerable transformers. Following the survey, we identified a number of issues that required intervention.
First, the substation was situated within a flood risk area, our flood risk assessment revealing that the wall height was unable to sufficiently to protect the equipment in the event of a flood. This is a particularly concerning issue given the impacts climate change is having on both the severity and frequency of flooding incidents: a trend that is not expected to fade with time.
Secondly, while the bunds were constructed in concrete and designed to contain any leaks from the transformers, they lacked the base necessary to do this effectively. Similarly, the bund walls showed clear signs of ageing, complete with cracks could potentially expose the environment to major contamination if leakages did occur following disruptive events or floods.
To rectify these issues, we specified our own specialist polyurea for use. One of the most durable coatings available in the industry, our lining system is specially designed to be hydrocarbon resistant, releasing no hydrocarbons, even under impact. These properties, which I’ll discuss in detail below, make the coating particularly effective for bund lining applications in which it provides two way protection against both flood ingress and leakages of oil or other pollutants into the substation site and wider environment. But I digress: back to the practicalities.
Addressing these problems saw us undertake a number of steps as listed below
● First, we conducted a three stage wash to the existing walls and concrete bases.
● We then installed a GRP sump.
● We laid an Icopal Imperma membrane with bitumen primer and seal to existing substrate and walls.
● We installed 100mm L-BAR to front wall to extend wall height.
● To complete the preparation, we then applied Rallithane sealant to all angles and joints.
● The coating began with our application of Stainguard Rapide Primer and a broadcast with fine grit.
● We then ensured all existing assets were covered to prevent any overspray.
● Finally, we spray-applied our polyurea lining to 2mm thickness.
3. Quality Control
● To ensure quality and that the containment was fit for purpose, we conducted hydrostatic testing.
4. Additional works
● Finally, we reinstated stone to complete the bund.
The Benefits of Adler & Allan’s Polyurea System
To understand just why our specialist polyurea is such an effective flood mitigation and oil containment solution, it helps to understand its properties and how they lend themselves to everything from structural reinforcement to reducing an asset’s Total Cost of Ownership and the damages incurred through disruptive events such as flooding. I’ve summarised these properties below:
- Structural integrity – Owing to its polyurea base, our polyurea adds structural integrity to any surface and can expand and contract to allow cracking of up to 15mm without defect. These properties allow the coating to completely negate the effects of age-induced asset and substation deterioration.
- Reduces costs – Secure and low maintenance, our spraylining system is capable of reducing the Total Cost of Ownership over the lifetime of the asset, supporting the Totex approach favoured by Ofgem.
- Waterproof – The coating is 100% waterproof and chemical impermeable, making it suitable for a number of specialist applications including flood protection, corrosion control, and secondary containment. As a result, the substation is effectively protected against ingress.
- Durable – With a 50 year design life and 10 year warranty, Adler & Allan’s polyurea maintains chemical resistance, adhesion and other physical properties for decades, making it a reliable, cost-effective alternative to capital replacement.
- Non-disruptive – Virtually unaffected by high humidity, temperature and residual moisture during and after application, our polyurea coatings can be applied with minimal disruption to service.
- Fast setting – Touch-dry in seconds, usable within the hour, and fully set within 24 hours, the coating demands significantly less time on site than other solutions.
- Eco-friendly – The coating is environmentally safe, with no hydrocarbons, vapours, fumes or chemicals released during or after application.
As shown by the images in this article, we ensured that every potentially vulnerable area of the site was lined with the coating. The result is that the site is significantly well protected from the flood ingress that previously threatened the transformers. Also, the coating’s impermeability negated the risk of the major contamination, addressing the cracks, ageing, and lack of base that we identified as critical issues during our site survey.
As a result of our work, SSE’s site will now benefit from a protection window of at least 25 years.