As part of a 2019 maintenance project, Wardle Painters Ltd was appointed to provide surface preparation and protective coatings for the CT3 Tank at Gatwick Airport. The airport wanted to ensure the adequate protection of this containment structure and Wardle Painters Ltd was responsible for revamping the tank lining to the highest health and safety standards.
Wardle Painters Ltd was appointed to undertake internal lining works including floor plates and up to 2m for shell plates. Using grit blasting surface preparation, shell plates and pipework were open blast cleaned by other experienced and trained operatives. The remaining floor area was track blasted to save time and reduce waste.
After each day, the prepared areas were cleaned using industrial hoovers and the profile was checked with Testex Tape and a Micrometer. Testing from salts was also completed with a Bresle Sample Patch Kit.
All areas were blast cleaned to an SA2 ½ Standard and checked with a surface competitor. These areas were then coated daily with Interline 982 to 40 microns DFT. After a final clean, all primed areas received a stripe coat to all welds and sharp edges, followed by two full coats of Interline 984 at 300 microns DFT.
Regular wet film checks were carried out during application and once the lining had cured, dry film checks were then carried out. Heating and dehumidification were also used to aid conditions in the tank when required.
The tank was checked and approved by a Level 2 Coating Inspector who carried out a spark test to check for any discontinuities such as pinholes and holidays which could drastically reduce the lifespan of a protective coating system. A rub test was also carried out to ensure the lining was cured and fit for purpose.