Storage tank?

[truemanufan]

How would you correctly calculate the appropriate size of storage tank needed?

 

[WHPES]

It is a bit subjective - How many bathrooms / showers, what size is the cylinder? Are any of the cold taps / WCs fed from it, what is your water supply flow rate like? How much space is available for a tank?

 

[turnpin]

under B.S 6700 min requirement is 230ltr`s to supply hot and cold services but as WHPES
states that would need to be stepped up if you have extra bathrooms showers etcregards turnpin

 

[truemanufan]

Thanks

 

[WHPES]

BS6700 -

25 gallon if only to feed hot water cylinder.

50 gallon (230l) for other services as well as cyinder.

Remember that these are the nominal sizes and as the tank is not filled to the top, you typically only get about 2/3 to 3/4 of this.

It is a standard and not a regulation so not mandatory.

In my own house I only have a 25 gallon tank supplying a power shower etc (there is not physically space for a larger tank) but the pressure of the mains where I live is such that even with the shower going full tilt and the washing machine on at the same time it is impossible to run it dry.

 

[kirkgas]

BS6700 -

25 gallon if only to feed hot water cylinder.

50 gallon (230l) for other services as well as cyinder.

Remember that these are the nominal sizes and as the tank is not filled to the top, you typically only get about 2/3 to 3/4 of this.

It is a standard and not a regulation so not mandatory.

In my own house I only have a 25 gallon tank supplying a power shower etc (there is not physically space for a larger tank) but the pressure of the mains where I live is such that even with the shower going full tilt and the washing machine on at the same time it is impossible to run it dry.

BS6700 quotes you need 25 gallons for hot and 25 for cold, the tank needs to be sized to supply that amount of water, eg if only supplying hot you need 25 gallons so you would purchase a 40/25 tank as they are/were called, 40 being what it holds, filled to the top like a bucket, and 25 is what it holds when ballcock and overflow are properly positioned, central heating tanks were 10/4 under the same theory

 

[Bernie2]

Yes it was called nominal and actual capacity.

Nominal being the capacity of the tank if filled to the top.

Actual being the amount of water in the tank when fitted and adjusted to water level.

The water storage vessel often called a tank is not really a tank at all. A tank is enclosed on all six sides, a storage tank isn't, it usually has a loose lid, so its really a cistern.