The Water Tank Sizing Guide below is designed to help you estimate the correct water tank size. Depending on your application there may be other points to consider, you can contact our team at firstname.lastname@example.org for advice.
Once a flow rate has been calculated for the booster set, we need to consider the size of the break tank. A simple calculation can be used to gauge adequate capacity.
An element of diversity needs to be taken when calculating this figure as some systems will only run at full flow for a few minutes and the cold water feed may be of a size to keep up with the outgoing flow. This can result in the storage time being reduced and a smaller tank would be selected.
Water Tank Sizing Graph
Another consideration is the category of the air gap required in the tank. This is to prevent a backflow that could cause contaminated water to flow back into the domestic mains water system.
Backflow contamination prevention is achieved in a break tank by correctly positioning the ball valve and overflow arrangement.
All PUK (Pumps UK Ltd) break tanks are fitted as standard with an AB air gap and are suitable for all categories of use.
A non-mechanical backflow prevention arrangement of water fittings where water is discharged through an air gap into a break tank with an unrestricted piped overflow.
A non-mechanical backflow prevention arrangement of water fittings complying with Type AA, except the air gap is the vertical distance from the lowest point of ball valve. A correctly sized spillover weir is fitted to overflow water before the air gap is compromised.