WorksheetsAC 2.2 Cold Water Supply Systems in the UK
Total questions: 15
Worksheet time: 8mins
When is storage of cold water required in the Direct System?
When using a high pressure hot water storage vessel
When the hot water supply is from a low pressure hot water storage vessel
When the cold water supply is low
When using a combi boiler
What type of valve is used in the WC cistern according to the diagram?
Lever type valve
Spherical ball type service valve
B51212 part 2, 3, or 4 float operated valve
Gate valve
Which appliance is the first off the cold water main in the direct cold water installation?
Sink
WC cistern
Combi boiler or instantaneous hot water heater
Bath
What is the main difference between the two types of installations shown in the diagram?
The type of water heater used
The location of the storage cistern
The number of appliances connected
The type of pipes used
What is the function of the spherical ball type service valve in the system?
To regulate water temperature
To control water flow
To filter impurities
To increase water pressure
What happens if the cold water main is under repair?
There is no cold water storage.
The water becomes hot.
The water pressure increases.
The system becomes quieter.
What is a common problem with taps and valves in this system?
They are always new.
They never wear out.
They can be worn or faulty, causing water hammer.
They increase water temperature.
What is the range of operating pressures for the system?
0.5 to 1 bar
1 to 2 bar
1.5 to 3 bar
2 to 4 bar
What is the main purpose of the sandstone aquifer in the diagram?
To store water
To filter water
To provide a source of water
To increase water pressure
What is the role of the pressure switch/flow controller in the system?
To measure water pressure
To control water flow and pressure
To store water
To prevent backflow
Which of the following is a disadvantage of using an accumulator?
Requires a large cistern in the roof space
Accumulator needs to be sized carefully
Good pressure and flowrate to the kitchen sink
Water is available in the event of pump failure
Which of the following is a disadvantage of needing careful monitoring for water quality?
Water source needs careful monitoring for water quality
Good pressure and flowrate to the kitchen sink
Water is available in the event of pump failure
Requires less pipework
What is a disadvantage of pumps being noisy?
Reduced pressure at some outlets and fittings
Good pressure and flowrate to the kitchen sink
Water is available in the event of pump failure
Requires less pipework
What is a disadvantage related to the structural support for cisterns?
More structural support required to carry the weight of the cisterns when full of water
Water is available in the event of pump failure
Little or no risk of water source contamination
An expensive accumulator is not required
What is a disadvantage related to pressure at outlets and fittings?
Reduced pressure at some outlets and fittings
Water is available in the event of pump failure
Little or no risk of water source contamination
An expensive accumulator is not required
