What is the purpose of the grommet in a cold water storage cistern?

To allow for the passage of the open vent

To secure the lid to the cistern

To provide a connection for the warning pipe

To filter debris from entering the cistern

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 prevent contamination of the water in the cistern

To filter the water entering the cistern

To provide a place for the screened vent

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 potable, wholesome water.

It should be capable of supplying non-potable water.

It should be made from specific materials only.

It should contain a byelaw 30 kit.

What is often included in a kit produced by some manufacturers for storage cisterns?

A suitable insulating cover and components fitted to the cistern.

Instructions for water purification.

A guide to the previous bylaws.

What is the advantage of using glass reinforced plastic (GRP) for cold water storage cisterns?

It has relatively high insulation properties

It is the most popular material

Why should galvanised steel cisterns be replaced in some older properties?

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?

British and European standards directory

Plumbing and Domestic Heating directory

Materials and Components general directory

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

At least the capacity of the hot water storage vessel

Why is it important to avoid oversizing a cistern?

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 at least 150mm larger all the way around than the base of the cistern.

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 size does not matter as long as the cistern is supported.

What material is recommended for the construction of the cistern base?

Moisture resistant plywood or tongued and grooved floorboard

Is insulation required under the cistern?

No, insulation under cistern is not mentioned.

Yes, to support the cistern weight.

No, but it is recommended for energy efficiency.

What type of valve is indicated at the point where the cold feed to the hot water storage cylinder begins?

BS 1212 part 2 float-operated valve

What is used to seal the vent pipe in the diagram?

Neoprene rubber sealing grommet

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

Where should the highest demand outlet be positioned in relation to the float-operated valve (FOV)?

On the opposite side to the FOV

How should the outlets be positioned to encourage crossflow in a cistern?

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

What is recommended to be installed on storage cisterns with a capacity greater than 1000 litres?

C) Separate warning and overflow pipes

B) A large diameter header pipe

What is the purpose of the screened vent on the cold water storage cisterns?

C) To allow air in and out of the cistern

A) To provide access to the float valve

9189PH2CWPPT7Q1

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What year were the Water Supply (Water fittings) Regulations that state a CWSC should be capable of supplying wholesome water enacted?

According to the Water Supply (Water fittings) Regulations, what must be included with a CWSC to ensure the water does not become contaminated?

What is the purpose of fitting a service valve on the inlet and outlet of cold water storage cisterns?

Why should cold water storage cisterns have a screened warning/overflow pipe?

What is the reason for insulating cold water storage cisterns against freezing and warming?

How should cold water storage cisterns be installed to prevent stagnation?

Why should cold water storage cisterns be supported over the whole base?

What is the purpose of the grommet in a cold water storage cistern?

Where is the screen located in a cold water storage cistern?

What is the function of the screened vent in a cold water storage cistern?

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