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Sunday, 22 September 2019

Coatings for potable water tanks

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Monday 09 March 1998 1:00:00 am

What coatings are suitable for interior application of potable water concrete/steel
tanks? Please suggest.

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Thursday 02 April 1998 1:00:00 am

The health guidelines in practically all countries specify that the only coating systems that may be
used for lining drinking water tanks are those from which no odours are released and from which no
phenols, formaldehyde, various aromatics or metallic components are eluted into the water.
Materials that have proved suitable for this purpose for use in one-pack processing are various
chlorine rubber and vinyl resin systems which must, of course, be free from any chlorine
consumption. Two-pack coating materials based on epoxy and polyurethane resin, with and without
solvent, can also be used, generally in film thicknesses up to 220 µm, in up to 5 coats. A tried and
tested tank coating formulation has the following components (in parts by weight): vinylidene
chloride/acrylonitrile copolymer (20), phthalate plasticiser (1), (optional) TiO2R (15),
methylethylketone (50), xylene (14); naturally, it is important to ensure thorough film drying and
solvent release.

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Friday 13 November 1998 1:00:00 am

A 2 pack epoxy system based on liquid epoxy resin (DER 383 DOW) and an amine based curing agent or amidoamine curing agent ( Ancamine 2410 or Ancamide 2426) would be suitable. You'll have to pay attention to the tank volume. Some curing agents are cleared for an especific minimun volome

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