Our client was a large hospital with 4 concrete cold water storage tanks supplying the whole hospital site. Each tank was sized at 8.0 x 6.5 x 1.8m. The tanks had previously been coated but this was suffering from excessive osmotic blistering.
The existing coating was removed by abrasive blasting.
Dehumidification plant was introduced and the substrate regularly tested to ensure the moisture content was reduced to below 5%. A 150micron coat of a damp sealant was then applied to consolidate the concrete substrate and improve adhesion of the coating system.
All joints had a ‘stripe coat’ of DWPU applied, to build up a nominal thickness of 3 – 5mm in these critical areas. This was followed by a base coat of DWPU applied to all internal surfaces at a nominal thickness of 500 micron.
The above was repeated with a top coat of DWPU.
To maintain the integrity of the tanks and their contents, solo-lift ultrasecure, sealed and vented double skin access covers were installed to replace the existing covers.
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