Case Study - Cooling Towers - Internal & External BAC Relining
Project Brief: The Internal and External Relining of 2 No. BAC Cooling Towers
System Specification: Solvent Free Polyurethane
Completion Date: 25th January 2007
COVAC Contract Ref: 574
All internals of the towers were previously coated with Baltibond. This coating had reached the end of its useful life due to sub-film corrosion, poor elongation properties and subsequent de-bonding. The externals of the towers were painted with aerosol paint, which had reached the end of its useful life due to excessive sub-film corrosion, low film build and general deterioration.
The internal substrate of the 2 No. Towers prior to any preparation work involved in removing all of the existing failed non flexible epoxy coating.
On initial inspection severe corrosion was found to be apparent on numerous components, which were removed and subsequently replaced once the coating process had been completed.
All internal surfaces were prepared in accordance with Swedish Standard SA 2.5 BS7079 Part A1 1989, utilizing mechanical, abrasive blasting and manual tools to raise a minimum surface profile and removing all surface scale and corrosion.
Any exposed or protruding rubber jointing strips were cut back to the substrate. All joints were then filled utilizing a flexible polyurethane mastic / sealant.
The finished coat of Solvent Free Polyurethane has been Spray applied.
The external substrate of the towers and surrounding associated steel work, prior to the preparation work involving the removal all of the existing failed epoxy Baltibond coating
All steel work and external surfaces were dry abrasive blasted in accordance with Swedish Standard SA 2.5 BS7079 Part A1 1989, utilizing mechanical and manual tools to achieve the optimum surface adherence.
the externals of the cooling towers together with the associated steel works having received the final coat of Solvent free Polyurethane.
On completion of our full scope of works, BAC Balticare replaced all new fan housing’s and components, which were subsequently recoated externally by Covac Site Operatives.
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