Effluent Tank Lining
The new effluent tank require a suitable tank lining to protect against hydrogen sulphide and biogenic sulphuric acid attack.
We proposed the application of a solvent free, crack bridging epoxy tank lining as the most suitable form of protection for the new concrete tank.
Preparing the tank for lining
The concrete was first prepared by method of vacuum controlled diamond grinding to remove surface laitance and contaminants to ensure excellent adhesion of the new tank lining. As with all coatings a tank lining is only as good as the surface it is adhered to and how that surface is prepared. All prepared surfaces were vacuumed clean to remove dust from the preparation works.
Applying the fairing coat
To fill blow holes and pores in the concrete a grout coat of Remmers Sulfatex was applied using slurry brushes and trowels. This is essential when relining concrete tanks as blow holes cannot be filled with coatings alone.
Applying the tank lining
The tank was first primed using Remmers Epoxy MT100 – a damp tolerant epoxy primer which can be applied to concrete substrates with a moisture content of up to 6%. Once cured Remmers Epoxy WHG was applied in two coats by method of brush and roller. This epoxy tank lining can crack bridge to 0.2mm which is the standard design width for site cast concrete, making it particularly suited to this tank lining application.
Testing the new tank lining
As per our standard practice the new lining was tested for pin holing using a DC Holiday spark tester. Where found pin holes were marked with chalk prior to touching in using the same material applied by brush. This process is essential for ensuring a pin hole free finish as each pin hole is a potential point of failure in which aggressive agents can enter and undermine the tank lining.