The overflow for a water supply tank shall be covered by a corrosion-resistant screen with what minimum mesh size?

The minimum mesh size for the corrosion-resistant screen covering an overflow for a water supply tank is specified as 16 x 20. This mesh size is adequate for preventing the entry of larger debris or animals while still allowing for adequate water flow and drainage.

Using a 16 x 20 mesh (which translates to 16 holes per inch in one direction and 20 holes per inch in the other) strikes a balance between filtration and structural integrity. A larger mesh size would allow more debris to enter and potentially clog the overflow, risking water quality and system efficiency. Conversely, too fine of a mesh could impede the flow of water, creating a risk of overflow and water pressure issues.

This regulation ensures that the overflow remains functional and that the water supply system operates efficiently, safeguarding against contamination while also maintaining water quality standards. Overall, mesh size is critical in proper plumbing design, ensuring the longevity and reliability of water supply systems.