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Case Study- Concrete Water Tanks at a Hospital in the North of England

Posted on November 23, 2012

Recently, the team at COVAC were set with the task of repairing and relining two concrete water tanks at a hospital in the North of England. With both tanks sized 8m x 5.5m x 3m and in need of considerable repair, this was a large scale project as the (now banned) bitumen based internal coating previously used on the tanks had reached the end of its useful life so needed to be replaced before any further problems arose. Continue Reading

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What Problems are Associated with GRP Tanks?

Posted on October 26, 2012

Whilst many see the replacement of an existing steel water tank with a brand new GRP (Glass Reinforced Plastic) tank as the ‘ultimate solution’, there are still a few important things to bear in mind and potential problems that should be considered. COVAC can inform you of such problems to ensure you are fully aware and so can make an informed decision as to whether the purchase of a GRP tank is a sound investment for the future or if the refurbishment of your existing tank would be a better option. Continue Reading

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Preventing Pseudomonas with Cooling Tower Coating

Posted on September 19, 2012

Alongside legionella (a bacterial growth that can lead to legionnaires disease which we have covered a lot lately due to the outbreak) and Biofilm, another harmful bacteria group that can thrive in poorly maintained cooling towers is Pseudomonas – a growth that can lead to various health and hygiene problems. Is there a way to prevent pseudomonas and other harmful bacteria from taking hold and creating health risks in your cooling tower? Well
luckily there is, COVAC are experts in cooling tower coating, repair and refurbishment. Continue Reading

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Keep On Top of the Condition of Your Cooling Towers

Posted on September 6, 2012

As a business manager, you will always have a hundred and one things to do, think about and organise on a daily basis; it is understandable therefore that some things will always get pushed to the bottom of the pile. When it comes to the condition of your cooling towers, however, you can’t afford to let essential repairs be pushed back or ignored. If your cooling towers are in poor condition, you could be faced with significant and potentially dangerous problems. Here at COVAC we provide exceptional cooling tower refurbishment services and urge you to keep on top of the condition of your cooling towers. Continue Reading

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Internal Surface Relining of AHUs

Posted on August 22, 2012

Subjected to incessant and aggressive conditions, air handling units (AHUs) often suffer from seriously corroded internal surfaces that need to be addressed quickly and effectively to prevent possible contamination from the Legionella bacteria which could lead to an outbreak of Legionnaire’s disease (recently highlighted in the popular BBC series ‘Holby City’). At COVAC we have been offering our expertise for over 15 years and as the market leader in AHU refurbishment using solvent free polyurethane technology we can offer a reliable AHU reline and refurbish service with a long term guarantee.

As the dominant company in this industry we pride ourselves on providing our clients with long-term protection that tackles the problem of AHU corrosion. Utilising the very best and most effective solvent-free, high performance technology, COVAC can help to reline your AHU with the very best product on the market.

We often discover that the original factory condition of the internal surfaces of Air Handling Units has simply broken down over time and constant use leading to micro aquatic bacterial growth on the corroded surface and contamination to the outlet.

It is now a legal requirement that your AHU complies with the guidance of ACOP L8, and therefore using products that meet with the water regulations is a must. Our solvent free, urethane coating offers a raft of economic and safety advantages, including:

•    Resisting the growth of bacteria such as Legionella;
•    Fast curing times even when exposed to low temperatures, thus reducing downtime;
•    Highly flexible to ensure it can accommodate structural movement;
•    High resistance to chemicals and impact;
•    Offers long-term protection with little need for maintenance.

At COVAC we believe that there is no other single coating product available that can match the durability and reliability that our service offers. If you’d like to find out more about our relining services for AHUs and cooling towers, click here and one of our knowledgeable and friendly team will gladly answer any questions you may have.

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Legionnaires’ Outbreak in Edinburgh Declared Over

Posted on August 8, 2012

The outbreak of Legionnaires’ disease that resulted in the death of three men has been declared over by health officials. Since the outbreak emerged in May, a total of 101 people have been treated for Legionnaires’ disease as either confirmed or suspected cases. Although the outbreak has been declared over the NHS are still keeping a close eye on people as it is expected that more cases could emerge in people who have been ill for a long period of time.

Health chiefs have said that the fast response at the start of the outbreak meant that the disease was brought under control relatively quickly and efficiently. All suspected and confirmed cases fall within the expected incubation period, which is why the decision has been made to declare the outbreak as over.

Experts are still trying to find the exact source of the outbreak, but officials are doubtful that they will ever be able to pinpoint the exact source which led to the outbreak. However the main consensus is that it was caused by a cooling tower in the city of Edinburgh. A report outlining what happened is being produced; it will also include recommendations for the prevention and control of future outbreaks.

The legionnaire’s outbreak has led to many people calling for all cooling towers to be reviewed to ensure they are safe. COVAC can assess the condition of your cooling towers and carry out all the relevant work to ensure your cooling towers are corrosion free and easy to maintain thus heavily reducing the likelihood of your cooling tower being the source of a future outbreak of Legionnaires ’ disease.

If you would like any more information on the services we provide, or you are concerned about your cooling towers, call 08000 484 609 or click here to fill in an online enquiry form and we will get back to you.

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Legionnaires’ Outbreak: What About Your Cooling Towers?

Posted on July 18, 2012

You are sure to have heard in recent weeks of the outbreak of Legionnaires’ disease in Edinburgh and that cooling towers or Air Handling Units (AHU) are said to be the possible culprit. Although this has not been confirmed and officials have claimed that the cause of the outbreak may never be confirmed, it is highly probable that cooling towers or AHU’s in poor condition are likely to be to blame. The importance of ensuring that your cooling towers are maintained to high standards has been highlighted and COVAC urge you to assess your cooling towers and invest in cooling tower repair to rectify/prevent any problems.

Legionnaires’ Update

Since the Legionnaires’ outbreak in Edinburgh, the number of confirmed and suspected cases has been steadily rising and sadly, the number of deaths is also rising. There has been a third death reported in the Edinburgh area. The number of confirmed cases on 9th July 2012 reached 49 while there are 50 suspected cases. The cause of this outbreak is thought to be cooling towers in the south of Edinburgh. There have been no further cases reported in other areas of the country; however, the outbreak has sparked a cry for all premises to review the condition of their cooling towers to prevent further outbreaks in the future.

Carter Cooling Tower Delamination of Existing Coating

Carter Cooling Tower after Relining by COVAC

Your Cooling Towers

Legionnaires’ disease is caused by bacteria called Legionella; Legionella can multiply rapidly if in the right conditions and if your cooling towers are not maintained properly they could become the perfect breeding ground for Legionella. COVAC offer a reliable and efficient cooling tower repair and relining service which could help you to prevent your cooling tower breeding Legionella bacteria.

Even with correct maintenance and water treatment the surfaces of cooling towers can become corroded, which makes cleaning very difficult and additionally, the corrosion provides an excellent food source and ideal breeding ground for the Legionella bacteria. If you’re worried about the condition of your cooling towers, we urge you not to ignore it or push it the back of your mind, investment now can prove very cost effective in the long term.

Carter Cooling Tower before Relining

Carter Cooling Tower Refurbished by COVAC

Whatever maintenance and refurbishment your cooling towers require, we should be your first port of call. Please browse our website to find out more information or call us on 08000 484609 with any questions or enquiries that you may have.

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Prevent Legionnaires Outbreak with Cooling Tower Coating

Posted on July 4, 2012

With Legionnaires disease continuing to sweep Edinburgh, and the victim count on the rise, there is no better time to wise up on this incredibly harmful, airborne disease, and the importance of lining and cooling tower coating to protect it from contamination, ensuring it isn’t responsible for the possible 7KM spread of this potentially fatal pneumonia spreading infection. COVAC can assist to make sure your cooling tower is as safe as can be.

Latest News

As an up to date figure, the number of cases in Edinburgh has now risen to an astonishing 95, with 48 confirmed and 47 suspected, the disease is seemingly rampant in the area. Three patients are currently in intensive care, whilst the rest are in differing states of infection.

The Disease

Legionnaire’s disease is a dangerous infection that has caused trouble in the past, most notably in 2004 when an outbreak in France resulted in 18 deaths over 86 cases. The culprit in this case was, in fact, a cooling tower in a petrochemical plant. The chemicals travelled over seven kilometres to infect some of the cases in this instance.

The source of the bacterium is almost always water supplies, and when tiny droplets of infected water splash out into the environment, the bacterium stays in the air, invisible, able to travel and easily inhaled.

What to Do

Naturally, the most important thing to do in this situation is to protect your environment by being absolutely certain your cooling tower is cared for, protected from corrosion or a substrate that could potentially harbour bacteria.  COVAC have the professional expertise and experience to do this, ensuring your cooling tower is thoroughly relined using a solvent free urethane coating system. If your tower is corroded in any way, this is the ideal breeding environment for the bacteria that contains Legionella and as such should be repaired and relined. The good news is that it CAN be refurbished, and a replacement isn’t usually required.

Our qualified, trained specialists are ready to help ensure your cooling tower isn’t the source of an outbreak, and with a friendly and knowledgeable service nurtured by putting our customers first, COVAC are your complete anti-Legionnaires disease solution.

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Legionnaires’ Disease Outbreak Update

Posted on June 20, 2012

The spread of the outbreak of Legionnaires disease which struck the Edinburgh area recently seems to have slowed.  There has been two fatalities, 39 confirmed cases and a further 49 suspected cases to date, however more cases are expected.  The Health and Safety Executive (HSE) and Edinburgh council are still trying to trace the source of the outbreak. A distillery Company and a pharmaceutical Company have so far been served with improvement notices on their cooling towers but the precise source of the outbreak may never be known.

Very often even companies that are dosing their cooling towers correctly can still have problems.  If the cooling tower substrates and bolts holding the panels together are corroded they cannot be cleaned effectively, additionally, this corrosion provides an ideal food source for the Legionella bacteria along with a safe haven from the chemicals trying to eradicate them.

BAC Cooling Tower before Relining

BAC Cooling Tower after relining by COVAC

To combat these problems COVAC can expertly repair and completely reline the internal surfaces of cooling towers with a water industry approved, solvent free urethane coating system.  This coating system provides a flexible yet impact resistant lining with an easy clean, ceramic tile like finish making future maintenance and water treatment so much easier and more effective.

COVAC offer a minimum 10 year guarantee against corrosion, erosion and leaking on all work undertaken making relining cooling towers a very cost effective solution.

For further information about this latest outbreak please follow this link:

For further information about Legionnaires disease and Legionella bacteria:

For further information about preventing legionella bacteria contamination please follow this link:

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Legionnaires’ disease Outbreak June 2012

Posted on June 12, 2012

One man has died and a further 51 people are fighting for their lives in an outbreak of Legionnaires’ disease in Edinburgh, further cases are expected . 16 Cooling Towers in the area are suspected as a possible source of the outbreak.

What is Legionnaires Disease?

A potentially fatal form of pneumonia caused by the Legionella bacteria and contracted by inhaling contaminated water droplets.  Cooling Towers are frequently the cause of an outbreak of Legionnaires Disease and a contaminated Cooling Tower is reportedly capable of spreading the disease over a 44 mile radius.

Are all Cooling Towers Contaminated?

No, but if not correctly maintained Cooling towers over time can develop corrosion on the internal surfaces which provide food and an ideal breeding ground for bacteria such as Legionella.  The corroded surfaces are also far more difficult to clean and treat during regular maintenance.

Cooling Tower before Refurbishment

Cooling Tower before Lining

Should a contaminated Cooling Tower be replaced?

No, even a badly corroded tower can be repaired, prepared and relined in accordance with ACoP L8 guidelines using an industry approved coating such as those supplied and applied by a reputable Company such as COVAC.

Cooling Tower after Reline by COVAC

Cooling Tower After Lining by COVAC

For further information about this latest outbreak please follow this link:

For further information about preventing legionella bacteria contamination please follow this link:

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