THE PROBLEM
The two new sprinkler tanks required a tank lining to ensure their water tightness.
Sprinkler Tanks Lining, Watford
THE SOLUTION
We proposed our proven crack bridging sprinkler tank lining in the form of Remmers Epoxy WHG.
Initially all surfaces to be coated were prepared by method of vacuum controlled diamond grinding to remove surface laitance present from the concrete pour. As shown in the images below this is clearly visible and it is imperative that this is removed to ensure proper adhesion of the tank lining.
The preparation process further exposed blow holes present in the concrete.
To provide a surface suitable to apply tank linings to a cementitious fairing coat in the form of Remmers WP Sulfatex was applied to all vertical surfaces. Blow holes cannot be filled with coatings alone, something which many other contractors frequently disregard.
This fairing coat was applied by method of slurry brush and finished with a brushed finish in order to provide an excellent mechanical surface for the tank linings to adhere to.
This was allowed to cure and hydrate naturally before the introduction of heating and dehumidification to reduce the moisture content and ensure the correct climatic conditions for coating application.
All of these parameters which are essential for the proper adhesion and performance of the tank lining were tested and recorded as part of our standard quality assurance.
A cove detail was installed using the same materials but with the inclusion of quartz aggregates to isolate the point of greatest potential movement at the floor/wall interface from the tank lining. This also acts as an elongation multiplier allowing the crack bridging tank lining to expand and contract over a greater distance in the event that movement does occur.
All surfaces were then primed using a damp tolerant primer in the form of Remmers Epoxy MT100 to ensure excellent adhesion of the tank lining.
Remmers Epoxy WHG was then applied in two coats of contrasting colour as per best tank lining practice. The use of two different colours enables applicators to easily identify that all areas have been coated
Wet film thickness readings were taken throughout the tank lining application to ensure that the correct thicknesses were achieved.
Following cure of the tank lining it was tested for porosity as per our standard tank lining quality assurance using a DC holiday spark tester. A single pin hole is a point of fluid egress or in a more chemically demanding environment than these tanks a point for attack to commence. Any defects identified were marked prior to making good using the same tank lining materials.