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Minimum Diameter for Overflow Drain for Cold Water Tank

Postby chipbag » Tue Mar 10, 2020 7:18 pm

I have a cold water tank in a basement (1230 litres) with a ball float inside. There is a overflow pipe to the side and immediately below there is what I would describe as a overflow drain which runs under the floor.

Is there a minimum diameter that the drain pipe should be
Should the overflow pipe run directly into the drain or is it acceptable to be about 36 inches above and to let it free fall into the drain
Should there be a plastic grate on top of the over flow drain

Thanks in advance.
chipbag
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