Sarah House gravatar image

Specifications for paints for drinking water tanks?

by Sarah House | 2017-09-13 15:53:36 -0500

Hi everyone,

Does anyone know of any simple to understand (or even not so simple to understand) specifications for paints for the inside of drinking water tanks? I have checked the ISO standards and there does not seem to be any details available here. The UK Water Industry covers this under the The Water Supply (Water Quality) Regulations 2016, 31 (which is not specific about the requirements but talks more about who can certify) and the DWI provides a list of named products, but I can't seem to locate any general guidance on how the certificiation should be made?

If anyone has seen any spec info from any source that would be great. If anyone has any examples of country specs from a low income country even better.

Many thanks

Sarah

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John Cody gravatar image

by John Cody | RedR Experts | 2017-10-07 06:26:03 -0500

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Hi Sara

Is the purpose of the paint water proofing or corrosion protection?

Check out the link for a product for waterproofing the roofs of masonry/concrete tanks. http://resapol.com/wp-content/downloa....

I am not aware of paints specifically for the inside of tanks, and I would not be confident that the above product would be satisfactory under pressures that would be encountered on the walls of a water tanks. In the past bitumen was used in joints but I think this practice is likely to be frowned upon at this point, as I think modern practice would be to provide internal water proofing measures at the construction phase. If you have access to the BSI online there is a section within BS 8110 (Structural use of reinforced concrete) that deals specifically with the design and construction of water retaining structures-http://lms.iesl.lk/pluginfile.php/2331/mod_resource/content/1/8110%20Part%201-1997.pdf. This standard has been superseded by RC Eurocode, but the Provisions of the Eurocode are likely to be broadly similar.

You could try googling "Tanking Products". These products seem to be mainly aimed a damp-proofing basements, and are unlikely to function under the pressures that would be encountered in a reservoir. If the purpose is not water proofing then I think you would ok using a non oil or lead based acrylic paint. If the purpose of the paint is corrosion protection then I think modern practice would be to provide so form of cathodic protection. You could have a look at http://resource.npl.co.uk/docs/scienc... to see if this is a potential solution to your problem.

Hope this helps

John

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Tim Foster gravatar image

by Tim Foster | RedR Experts | 2017-10-06 15:10:54 -0500

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HI Sarah We used what I remember as a two part epoxy paint in Rwanda in the early 1990s for small water tanks. My starting point would be https://www.google.ch/search?q=epoxy+... but guess you have researched well beyond that. Sorry not to be able to be of more use. Good luck.

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Asked: 2017-09-13 15:53:36 -0500

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Last updated: Oct 07