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Acothane DW Nationwide Water Tank Services

FAQ

  1. Is fibreglass a good option for the relining of our water storage tank?
  2. Can you repair holes in my water tank or cooling tower?
  3. Our cooling tower is leaking from the joints and the internal coating is de-bonding...
  4. Our GRP Tank is leaking. The manufacturers guarantee is now invalid. Can you repair and reline our tank?
  5. We need an urgent budget price. How can I get one?
  6. Can your applied product help prevent the risk of Legionella in my water system?
  7. Our water tank is in a plant room where the roof of the plant room is extremely close to the roof access of the tank...
  8. What is the difference between Acothane DW and an Epoxy coating?
  9. How is your product different to a Butyl or PVC Liner?
  10. Is Bitumen a suitable coating for potable water tanks?
  11. Our steel tank is corroded. Should I not just install a replacement?
  12. Can Acothane DW be applied to any substrate?
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We are considering lining our potable water storage tank with a fibreglass lining. Is this a good option for the relining of our water storage tank?

Please visit this page for more information

1

Can you repair holes in my water tank or cooling tower?

Yes! We have successfully repaired and relined many water tanks and cooling towers that have developed holes due to excessive corrosion.

Here you can view some completion reports on Water Tanks and Cooling Towers.

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2

Our cooling tower is leaking from the joints and the internal coating is de-bonding. Do you have a long term solution?

The mastic between the steel joints of the tower can deteriorate very rapidly in a cooling tower due to the aggressive nature of the dosed water. Once the mastic starts to degenerate it loses its elasticity and consequently, fails to meet the demands of the structural movement within the tower.

Various coatings are applied to the internal surfaces of cooling towers, from Bitumen and epoxy coatings to Polymeric Hybrid thermosetting Powder, which is fuse bonded to the substrate (eg. Baltibond). In our experience, these types of generic coating systems fail due to poor elongation properties and low chemical resistance.

View a relevant completion report onCooling Towers.

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3

Our Glass Reinforced Plastic Tank (GRP) is leaking from the joints. It's just over twelve months old and the Manufacturers Guarantee is now invalid. Can you repair and reline our tank?

Yes, there are numerous problems that can occur with Glass Reinforced Plastic Water Tanks (GRP):- Mould growth, cracks and air filled cavities that provide a home for bacteria and corroding fasteners but the most common problem is leaking from the joints. COVAC have a solution to all these problems. Visit this link for more information.

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4

We need an urgent budget price. How can I get one?

All you need to do is fill out this enquiry form - click here.

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5

Can your applied product help prevent the risk of Legionella in my water system?

Yes! Check out this link for further information.

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6

Our water tank is in a plant room where the roof of the plant room is extremely close to the roof access of the tank. How would you gain safe access and egress?

We have a vast experience in working on water retaining structures that have difficult access and egress issues. One of the most common problems is when the roof access of the structure is extremely close to the roof of the plant room itself. There are various ways of solving this particular problem.

View a relevant case study here, showing an example of us solving the access issue at a large hospital.

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7

What is the difference between Acothane DW and an Epoxy coating?

Acothane DW is a solvent free polyurethane which is WRAS/DWI approved for water retaining structures, manufactured from concrete, steel or GRP (Glass Reinforced Plastic). Most Epoxy coatings that have DWI Approval are only approved for steel.

Acothane DW has approximately 35% elongation properties, which means it has the capabilities of accommodating the anticipated structural movement which you would expect in all types of water retaining structures. Epoxy coatings are generally quite 'brittle' coatings and will crack and subsequently, de-bond under the slightest stress or movement within the structure.

View a relevant case study here.

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8

How is your product different to a Butyl or PVC Liner?

Butyl bags tend to be used for a 'quick fix'. They are, essentially flexible liners that are suspended from the top of the tank (usually by aluminium strips). They do not address the problem of corrosion in the structure especially the roof, which usually remains completely unprotected, allowing the risk of contamination from bacteria (including Legionella) when condensation forms and drips back into the potable water. COVAC are usually called in to urgently rectify jobs where these liners have been installed because they are generally quite flimsy and once even the slightest damage occurs, the water in the structure traverses through the damaged area (even a small 'pinhole') causing ingress of water between the substrate and the liner.

This usually results in water stagnating behind the liner causing a risk of bacterial growth and eventually, pushing the liner to the top of the tank and causing the tank to overflow.

View a completion report on Butyl and PVC Liner problems over here.

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9

Our potable water storage tank is coated internally with bitumen. Is this OK?

Bitumen has been prohibited for use by the WRAS for many years now. Most bitumen based products will not resist the growth of micro-aquatic organisms, therefore your tank is at risk of sustaining bacterial growth if the bitumen remains. We would always recommend the full removal of bitumen from a potable water tank or cooling tower.

Check out a completion report on the removal of bitumen here.

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10

Our steel tank is corroded. Should I not just install a replacement water storage tank?

Many engineers believe this choice to be the 'Rolls Royce' option (usually because it is the most expensive option). By the very nature of the fact that 25% of our current turnover is catered for by the repair and relining of Glass Reinforced Plastic (GRP) water storage tanks, we would have to disagree.

From experience, we have found that most engineers exchange the problem of corrosion (of their existing steel water storage tank) for the equally, (if not worse) problems of erosion, corrosion of steel fasteners, deterioration of the mastic between the joints (and consequential leaking) and mould growth.

Find out more on here.

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11

Can Acothane DW be applied to any substrate?

Acothane DW is WRAS / DWI Approved for concrete, steel and Glass Reinforced Plastic (GRP) and has excellent adhesion properties for all these (and other) substrates.

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