Cold Water System Design Quiz

Between which temperatures does Legionella bacteria thrive?

• 10°C and 20°C

• 20°C and 37°C

• 30°C and 50°C

• 37°C and 50°C

At what temperature does Legionella bacteria multiply rapidly?

• 20°C

• 25°C

• 30°C

• 37°C

What should cold water systems be designed to prevent?

• Temperature of the water exceeding 10°C

• Temperature of the water exceeding 20°C

• Temperature of the water exceeding 30°C

• Temperature of the water exceeding 40°C

According to BS EN 806-2: 2005 Section 3, what is the design pressure for all pipes and joints of a CW system?

• 5 bar

• 10 bar

• 15 bar

• 20 bar

According to BS EN 806-2: 2005 Section 3, what is the service life for all pipes and joints of a CW system at a temperature of 20°C?

• 10 years

• 20 years

• 30 years

• 50 years

What is the maximum temperature that cold water outlets (mains fed or stored) should not exceed when sentinel outlets are drawn off within two minutes at full flow?

• 15°C

• 20°C

• 25°C

• 30°C

What is a sentinel outlet?

• The outlet closest to the source of supply within the system

• The outlet with the highest water pressure

• The outlet furthest from the source of supply within the system

• The outlet with the lowest water pressure

What should be done with low-use outlets to maintain temperature requirements for cold water systems?

• They should be insulated

• They should be disconnected, where appropriate

• They should be left as they are

• They should be connected to the main supply

What is the minimum recommended capacity for cisterns supplying both hot and cold water systems in a small house?

• 100-150 litres

• 230 litres

• 100 litres per bedroom

• At least the capacity of the hot water storage vessel

For cisterns that only supply cold water to baths, washbasins, and WCs in a small house, what is the sufficient range of stored water?

• 50-100 litres

• 100-150 litres

• 200-250 litres

• 150-200 litres