THE PROBLEM
The two new build sprinkler tanks required a lining for water tightness. The complex geometry meant that a ‘bag’ type liner would not be suitable.
Sprinkler Tank Linings, Kensington
THE SOLUTION
We proposed the application of a highly elastic polyurethane tank lining that can crack bridge up to 10mm.
Initially all surfaces that the sprinkler tank lining was to be applied to was prepared by method of vacuum controlled diamond grinding.
This fairing coat was left as a brush finish in order to provide a mechanical profile for the tank lining to adhere to. A fillet detail was formed at the floor/wall interface to isolate this point of movement and maximise the elongation potential of the flexible polyurethane tank lining.
The fairing coat was allowed to hydrate naturally before the introduction of dehumidifiers to ensure the correct climatic conditions for tank lining application. These were tested and recorded as part of our standard tank lining quality assurance.
The two sprinkler tanks were then primed using a moisture tolerant polyurethane primer applied by method of brush and roller.
Once cured the first layer of the polyurethane tank lining was applied to a nominal thickness of 500 microns. This layer is more flexible, acting as a bond breaker across the entire lining.
Wet film thicknesses were taken during application to ensure the correct tank lining thickness was achieved. The cured lining was tested for pin holing using a DC holiday spark tester to ensure fluid tightness, with any defects found being marked and made good using the same material applied by brush.
The applied tank lining has a design life in excess of 20 years, providing a long lasting and durable tank lining solution.