Hot water system safety
Presentation
•
Professional Development
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Vocational training
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Practice Problem
•
Medium
Nigel Baker
Used 2+ times
FREE Resource
25 Slides • 23 Questions
1
2
3
Open Ended
What measures have been introduced to reduce the risk of scalding from hot water in homes?
4
5
Multiple Choice
Which of the following devices helps reduce the risk of explosion in unvented hot water systems?
Boiler stat
Pressure gauge
Water softener
Flow restrictor
6
7
Multiple Select
Which of the following statements about legionella are correct?
Legionella will grow between 20–46ºC.
Legionella is killed at 47ºC and above.
Legionella grows best below 10ºC.
Legionella is not affected by temperature.
8
9
Fill in the Blanks
Type answer...
10
11
Open Ended
Explain why it is important to install high efficiency (HE) boilers in domestic hot water systems from an environmental perspective.
12
13
Multiple Choice
What is a common consequence of heating hard water to 65ºC or above?
Lime scale is produced
Water becomes softer
Bacteria multiply rapidly
Water turns acidic
14
15
Open Ended
Describe the main purposes of storing hot water at a high temperature and distributing it at a lower temperature in plumbing systems.
16
17
18
Open Ended
Explain the function of a blending valve in a plumbing system and why it is important for safety.
19
20
Multiple Select
Which of the following appliances can be fed from a single thermostatic mixing valve (TMV) in group mixing installations? Select all that apply.
Wash basins
Showers
Kitchen sinks
Baths
21
22
Multiple Select
Which of the following are components used for temperature control in plumbing systems?
Cylinder stat
Boiler stat
Tap stat
Pressure gauge
23
24
Fill in the Blanks
Type answer...
25
26
Open Ended
Describe how a tap stat operates in older plumbing systems and its role in temperature control.
27
28
Multiple Choice
Which component in a boiler is responsible for regulating the primary water temperature that flows to the coil?
Thermostat
Pressure relief valve
Immersion heater
Insulation
29
30
Open Ended
Explain the function of a temperature/pressure relief valve in plumbing systems and why it is important for safety.
31
32
33
34
Multiple Choice
Which of the following statements about immersion heaters is correct?
They must have a resettable double thermostat as standard.
They do not require any safety cut-off device.
They are not regulated by any standards.
They only use a single thermostat.
35
36
Multiple Select
Which of the following are desirable characteristics of good insulating material for plumbing applications?
Not flammable
Vermin-proof
Impervious to moisture
Conducts heat easily
37
Fill in the Blanks
Type answer...
38
39
Multiple Choice
Which of the following components or pipework should be protected with insulation according to the guidelines?
Outside pipework
Pipework in the roof space
Service pipes (750–1,350mm)
All of the above
40
41
Fill in the Blanks
Type answer...
42
43
Open Ended
Explain why it is important to insulate cold water storage cisterns and describe the recommended method for doing so.
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46
Multiple Select
Which of the following are recommended materials for pipe insulation?
Rigid phenolic foam
Polyisocyanurate foam
PVC foam
All of the above
47
Open Ended
What questions do you still have about hot water system safety and efficiency?
48
Multiple Choice
Why is it important to control the temperature of domestic hot water systems?
To prevent scalding accidents
To reduce water usage
To improve water taste
To increase water pressure
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