The purpose with a domestic service water supply system is to provide consumers with enough hot and cold water.
In old buildings it is common with gravity storage tanks on the top floor of the building. More commonly used in new systems are pressurized tanks and supply pumps.
Domestic Water Supply with Gravity Tank
Domestic water supply system with gravity tank:
For proper operation of the system the gravity tank is located at least 30 ft or 10 m above the highest outlet or consumer. In taller buildings pressure reducing valves are required in the lowest floors before the fittings.
The volume of a gravity tank must be designed to compensate for limited capacity of a supply line. The tank fills up when the consumption of hot and cold water is lower than the capacity of the supply line - and the tank is emptied when the consumption is higher than the capacity of the supply line.
A drawback with the open gravity tank on the top floor is the potential danger of freezing during winter conditions. Huge tanks will also influence on the construction of the building.
Domestic Water Supply with a Pressurized Tank
Domestic water supply system with pressurized tank:
The pressurized tank is partly filled with air (or gas) behind a membrane. The air compensates for pressure variations during consumption and when supply pump starts and stops.
A pressurized tank has a limited compensating capacity for the shortage in a main supply line.
Estimating Required Buffer Tank Capacity
You are free to use the template bellow as a tool to estimate required buffer capacity in a water supply system. Log in to your Google Account to make your own copy to modify of the template. Alternatively - you can also save the Google Spreadsheet to your computer as a xls file.
Hot and cold water service systems - design properties, capacities, sizing and more.
Required cold water dwelling storage capacity - commonly used fixtures and types of buildings.
Cold water storage for occupants in common types of buildings as factories, hospitals, houses and more
Domestic Hot-Water sizing equations - heating capacity, recovery rate and power supply.
Design procedures for domestic hot water service systems.
Lime deposited vs. temperature and water consumption.
Recommended dimensions hot and cold water pipes.
Hot water can be circulated through a return pipe if it's instantly required at the fixtures.
Design hot water consumption of fixtures - basins, showers, sinks and baths.
The Legionella Pneumophila bacterium thrives in water supply systems and air conditioning systems - and may cause the Legionnairs disease.
Nominal pipe size, outside diameter, wall thickness, weight and working pressure.
Activity and average water consumption
Materials used in water distribution pipes.
Water service pipe lines extends from the potable water source to the interior of buildings.
It is fundamental to keep the potable water in the water supply systems uncontaminated.
Sizing of water supply pipe lines.
Required water supply to public buildings.
Typiclal limits for impurities in drinking water.
Free online tool for designing water supply systems in buildings.
Water consumption in garden fixtures.