Cold Water Flashcards

1
Q

The water Regulations state that the warning pipe in cold water cistern must be?

A

Sized to be able to cope with flow of water should the inlet valve fail

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2
Q

The vessel used to hold water in storage is refered to as a

A

Cold Water Storage Cistern

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3
Q

Which British Standard makes recommendation on the minimum size of cold water storage cisterns for a particular property?

A

BS EN 8558

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4
Q

Where would you find details of the quantity of fittings delivered to site by a plumbers merchant?

A

In the delivery note

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5
Q

Which of the following types of cold water system would normally be used in a dwelling which has high incoming water?

A

Direct

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6
Q

Which one of the following valves contains a valve seat (orifice) which you can change according to the available water pressure in the supply pipe?

A

A float operated valve

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7
Q

What us the minimum recommended clip spacing for a 22mm vertical copper pipe?

A

2400mm

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8
Q

To overcome the problems of noise created by high pressure mains in storage cisterns, the float operated valve is replaced with

A

Equilibrium float valve

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9
Q

The system of pipework which is to be found buried beneath the roads and streets which is used to convey water is referred to as the

A

Water mains

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10
Q

A float operated valve will respond to the rise and fall of the ……………… in the storage cistern

A

Level of the water

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11
Q

The special property of the ferrule is that it can be inserted into the water main using a clamp on chamber…

A

Without having to turn off and drain down the water main

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12
Q

The boundary stop tap is normally found

A

Just outside the perimeter of the property which it feeds

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13
Q

Direct cold water systems in areas with very high mains pressure are prone to giving off noise when the water flows. This is referred to as

A

Velocity noise

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14
Q

BS EN 8558 recommends that in a roof space, the loft insulation should be

A

Removed directly underneath the cistern to stop it freezing

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15
Q

The service pipe must be buried under the ground level to a minimum depth of

A

750mm

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16
Q

The service pipe terminates inside the building. At the end of the pipe there is a control device known as a

A

Service Stop Tap

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17
Q

The purpose of a service valve is to allow access to the float-operated valve for

A

Maintenance and Repair

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18
Q

One disadvantage of the direct system of cold water supply is that

A

If the main supply is shut off there is no cold water

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19
Q

In the direct system of cold water supply, all …………….. are connected directly to the rising main

A

Cold water draw off points

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20
Q

The ferrule is a means of

A

Isolating and disconnecting the services to a building

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21
Q

Water mains are the property of the

A

Water Authority

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22
Q

The service pipe buried beneath the ground to the recommended depth to prevent damage from

A

Frost penetrating down and freezing the pipe

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23
Q

Boundary stop valves on older properties are normally found contained within a

A

Chamber made of a section of drain pipe with a hinged lid

24
Q

One disadvantage of the indirect system of cold supply is that

A

It is more costly to install

25
In the indirect system of a cold water supply, only ............. are connected directly to the rising main
The cold water storage cistern and one tap
26
Which one of the following actions will provide the least disruption to the water supply in the property when it is necessary to isolate the supply to a WC cistern?
Turn off the supply at the service valve to the float operated valve
27
The service stop tap should be fitted no more than ............ above the floor
150mm
28
A float operated valve is a device which allows water to flow into the storage cistern
Automatically
29
What is the minimum distance between the top of the cold water storage cistern and an adjacent slope in the roof?
350mm
30
The term given to the pipes which are connected from a storage cistern to the draw-off points is
Distributing pipes
31
What is the primary purpose of flocculation in water treatment?
To remove color and turbidity
32
What is the typical size of a rising main for most dwellings?
15mm
33
What device prevents backflow in outdoor taps?
Double check valve
34
What is fluid category 1 water classified as?
Wholesome water for domestic use
35
What do the Water Supply (Water Fittings) Regulations 1999 aim to prevent?
Misuse of water
36
Who is responsible for maintaining the communication pipe?
Water undertaker
37
What is the final stage of the water treatment process?
Disinfection
38
What is a major disadvantage of a direct cold water system?
Risk of contamination during failure
39
Which size pipe is often used to supply baths for good flow rates in an indirect system?
22mm
40
What is the purpose of a water tower in a distribution system?
To increase pressure through height
41
What is back syphonage?
Reversal of flow due to a sudden loss of pressure
42
Which of these represents fluid category 5?
Water containing pathogens
43
Which type of shower valve adjusts for fluctuations in water pressure?
Pressure-compensating valve
44
What type of air gap is required for fluid category 5 in sinks?
AUK3
45
What is the primary purpose of a drain valve in plumbing systems?
To allow complete system drainage
46
Which type of pump boosts water after the shower valve?
Single impeller
47
What is required for cold water cisterns installed in the roof space?
Structural support
48
Which tap type avoids mixing water inside the tap body?
Bi-flow mixer taps
49
Which valve ensures full bore water flow in low-pressure systems?
Gate valve
50
What does activated carbon in filters primarily remove?
Chlorine and odors
51
How should MDPE pipes enter a building to prevent UV degradation?
With no more than 150mm showing
52
Which ion is used in base exchange water softeners to replace hardness?
Sodium
53
What supplies an instantaneous electric shower?
Cold water mains and internal heater
54
Who is responsible for monitoring private water supplies?
Local authorities
55
What material is resistant to de-zincification in fittings?
Gunmetal
56
What level of chlorine is typically added during disinfection?
Less than 1 mg/L