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Worksheets9189PH2CWPPT7Q1
Total questions: 42
Worksheet time: 21mins
What year were the Water Supply (Water fittings) Regulations that state a CWSC should be capable of supplying wholesome water enacted?
1989
1999
2009
2019
According to the Water Supply (Water fittings) Regulations, what must be included with a CWSC to ensure the water does not become contaminated?
Filtration systems
Bylaw30 kit
Heating elements
Cooling systems
What is the purpose of fitting a service valve on the inlet and outlet of cold water storage cisterns?
To regulate the water temperature
To allow maintenance
To prevent water contamination
To minimize the risk of freezing and warming
Why should cold water storage cisterns have a screened warning/overflow pipe?
To provide additional water storage
To allow for easy cleaning
To prevent stagnation and ensure water circulation
To exclude light and insects
What is the reason for insulating cold water storage cisterns against freezing and warming?
To maintain the correct water level
To ensure easy access for maintenance
To protect against temperature extremes
To prevent light from entering the cistern
How should cold water storage cisterns be installed to prevent stagnation?
By supporting over the whole base
By being accessible for maintenance
By allowing water to circulate
By excluding light and insects
Why should cold water storage cisterns be supported over the whole base?
To prevent distortion
To maintain the correct water level
To minimize the risk of contamination
To ensure they are accessible for cleaning
What is the purpose of the grommet in a cold water storage cistern?
To secure the lid to the cistern
To provide a connection for the warning pipe
To allow for the passage of the open vent
To filter debris from entering the cistern
Where is the screen located in a cold water storage cistern?
On the secure fitting lid
On the screened vent
On the warning pipe
On the grommet for open vent
What is the function of the screened vent in a cold water storage cistern?
To prevent debris from entering the cistern
To allow water to flow into the warning pipe
To secure the lid to the cistern
To provide a passage for the open vent
What is the purpose of the secure fitting lid on a cold water storage cistern?
To filter the water entering the cistern
To provide a place for the screened vent
To prevent contamination of the water in the cistern
To allow for the passage of the open vent
What does Schedule 2, paragraph 16 of the Water Regulations specify about a storage cistern?
It should be capable of supplying non-potable water.
It should be made from specific materials only.
It should be capable of supplying potable, wholesome water.
It should contain a byelaw 30 kit.
What is often included in a kit produced by some manufacturers for storage cisterns?
A list of approved plumbers.
A suitable insulating cover and components fitted to the cistern.
Instructions for water purification.
A guide to the previous bylaws.
What must cold water storage cisterns be in order to be suitable for the storage of cold water in dwellings?
Made of plastic
WRAS approved
Insulated
Galvanised
Which material is described as the most popular, easiest to install, and cheapest for cold water storage cisterns?
Glass reinforced plastic (GRP)
Galvanised steel
Plastic (polypropylene)
Copper
What is the advantage of using glass reinforced plastic (GRP) for cold water storage cisterns?
It is the cheapest option
It has relatively high insulation properties
It is WRAS approved
It is the most popular material
Why should galvanised steel cisterns be replaced in some older properties?
They are too expensive
They are difficult to install
They are no longer WRAS approved
They do not have insulation properties
As a plumber, which directory should you consult to ensure that the materials and components you install are suitable and approved?
WRAS materials directory
British and European standards directory
Plumbing and Domestic Heating directory
Materials and Components general directory
What is the minimum cistern capacity required for a small house with both hot and cold water supply?
100 litres
150 litres
230 litres
100 litres per bedroom
For a large house, how is the cistern capacity determined?
100/150 litres regardless of the number of bedrooms
230 litres minimum regardless of the number of bedrooms
100 litres per bedroom
At least the capacity of the hot water storage vessel
Why is it important to avoid oversizing a cistern?
To prevent water stagnation
To save on costs
To make installation easier
To comply with city regulations
What should be the minimum size of the base supporting a cold water storage cistern compared to the cistern itself?
The base should be the same size as the cistern.
The base should be at least 150mm smaller all the way around than the base of the cistern.
The base should be at least 150mm larger all the way around than the base of the cistern.
The base size does not matter as long as the cistern is supported.
What material is recommended for the construction of the cistern base?
Regular plywood
Moisture resistant plywood or tongued and grooved floorboard
Plastic sheeting
Metal sheeting
How much clearance is required at least for maintenance of the float operated valve (FOV) and cistern cleaning?
250mm
300mm
350mm
400mm
At 4°C, how much does a litre of water weigh?
0.5 kg
1 kg
1.5 kg
2 kg
How much would a 230-litre cistern weigh when filled with water at 4°C?
130 kg
230 kg
330 kg
430 kg
Is insulation required under the cistern?
Yes, to prevent heat loss.
No, insulation under cistern is not mentioned.
Yes, to support the cistern weight.
No, but it is recommended for energy efficiency.
What is the required distance between the float-operated valve (FOV) and the overflow in a cold water storage cistern?
50mm
25mm
75mm
100mm
What type of valve is indicated at the point where the cold feed to the hot water storage cylinder begins?
Service valve
Full-way gate valve
BS 1212 part 2 float-operated valve
Screened vent
What is used to seal the vent pipe in the diagram?
PVC tape
Neoprene rubber sealing grommet
Silicone sealant
Epoxy resin
What is the minimum size for the pipe used in cold feed to the hot water cylinder?
15mm
22mm
25mm
30mm
How should the cold feed to the cylinder be isolated for safety?
By a stopcock
By a check valve
By a full-way gate valve
By a pressure relief valve
What is the required installation height difference between the cold feed and the cold distribution for safety?
The cold feed should be installed 25mm higher than the cold distribution.
The cold feed should be installed 25mm lower than the cold distribution.
The cold distribution should be installed 25mm higher than the cold feed.
There is no required height difference for safety.
What does the cold distribution supply?
Hot water to the hot water cylinder
Cold water to the hot water cylinder
Cold water to various outlets
Hot water to various outlets
What can occur if parts of the cistern are not encouraged to mix and flow?
Crossflow
Stagnation
Overflow
Contamination
What should be encouraged to prevent stagnation in a cold water storage cistern?
Single outlet flow
Crossflow
No flow
Unidirectional flow
Where should the highest demand outlet be positioned in relation to the float-operated valve (FOV)?
On the same side as the FOV
Directly above the FOV
On the opposite side to the FOV
Below the FOV
How should the outlets be positioned to encourage crossflow in a cistern?
Both outlets on the same side
Outlets at the same height
One outlet higher than the other, on opposite sides
Both outlets at the bottom of the cistern
Why should cold water storage cisterns be small enough when linked?
To ensure rapid turnover of water to prevent stagnation
To make them easier to transport
To reduce the cost of materials
To make them easier to install
Where should the inlet and outlet connections be located on linked cold water storage cisterns?
At the same end
At opposite ends
On the top of the cisterns
On the bottom of the cisterns
What is recommended to be installed on storage cisterns with a capacity greater than 1000 litres?
A) A close-fitting lid
B) A large diameter header pipe
C) Separate warning and overflow pipes
D) Cistern supports
What is the purpose of the screened vent on the cold water storage cisterns?
A) To provide access to the float valve
B) To support the cistern
C) To allow air in and out of the cistern
D) To distribute cold feed
