8202CWPPT2L3

Cold water system component layout features for multi-storey dwellings include:

• Rising mains, storage cisterns, distribution pipes, and stop valves

• Only horizontal distribution pipes on each floor

• Direct connection to every fixture without storage

• Use of a single pipe for both hot and cold water

The system layout features for large scale storage cisterns used in multi-storey dwellings include:

• Provision for overflow, access manholes, partition walls, and proper inlet/outlet arrangement.

• Use of only underground tanks without overflow provision.

• Installation of cisterns on every floor without interconnection.

• Exclusion of access manholes for safety reasons.

Break cistern arrangements are described as:

• A system where a storage tank is used to regulate water supply to fixtures.

• A method of directly connecting fixtures to the main water supply without storage.

• A type of plumbing arrangement that uses only gravity for water flow.

• A system where water is supplied only during certain hours of the day.

What is a multi-storey building? Fill in the blank: A multi-storey building is one which is too tall to be supplied with the pressure of the _________.

• water main

• electric line

• gas pipe

• telephone wire

Why is boosted cold water used in multi-storey buildings? Fill in the blank: Boosted cold water is used to supply water to the ________ part of the building.

• highest

• lowest

• middle

• outer

Which of the following is a method to supply water in multi-storey buildings?

• Direct boosting systems

• Indirect boosting systems

• Both A and B

• None of the above

Why are direct boosting systems often not allowed by the water undertakers?

• They are too expensive

• They can reduce the mains pressure for other consumers and increase the risk of contamination by backflow

• They are difficult to install

• They require too much maintenance

If the demand is below ____ litres/second, then direct boosting may be allowed.

• 0.2

• 0.5

• 1.0

• 2.0

What device controls the pumps in a direct boosted cold water system as shown in the diagram?

• Pressure gauge

• Float switch

• Timer

• Manual switch

In a direct boosted cold water system, when do the pumps switch off? Fill in the blank: The pumps switch off when the water level reaches a depth of circa ____ mm below the shut off level of the float operated valve.

• 50

• 10

• 100

• 200