WorksheetsHot Water - PPT 3 - Pipework and Circulation
Total questions: 32
Worksheet time: 16mins
What is the function of vent pipes in a plumbing system?
To increase water pressure
To maintain system safety
To reduce water temperature
To enhance water flow speed
What impact does poor pipework design have on a plumbing system?
It increases water temperature
It reduces system efficiency
It enhances water flow speed
It maintains system safety
What is the purpose of the 22mm vent pipe in a direct plumbing system?
To discharge into the CWSC and seal with a grommet
To connect the heat source to the cylinder
To reduce water pressure
To increase water flow
In a direct plumbing system, what is the diameter of the primary circulating pipes?
15mm
22mm
28mm
30mm
What is the function of the heat source circulator in a direct plumbing system?
To discharge water into the CWSC
To connect the heat source to the cylinder
To circulate heat or act as a back boiler behind a solid fuel fire
To reduce the pipe diameter
What is the formula to determine the height of the vent in an indirect double feed system?
150mm + 40mm per metre of system height
100mm + 30mm per metre of system height
200mm + 50mm per metre of system height
120mm + 20mm per metre of system height
What is the capacity of the storage cistern fitted with BS 1212 part 2 FOV in the indirect double feed system?
150 litres
200 litres
100 litres
250 litres
What is the diameter of the primary flow and return pipes from the boiler to the coil in the cylinder?
22mm
15mm
28mm
30mm
What is the primary function of a vent pipe in a plumbing system?
To increase water pressure
To act as a safety relief
To reduce water temperature
To filter impurities
Where should the vent pipe be located in relation to the cold feed cistern?
Below the cistern
Beside the cistern
Above the cistern
Inside the cistern
How far should the vent pipe terminate above the top of the float valve?
Equal to the internal diameter of the vent pipe
Twice the internal diameter of the vent pipe
Half the internal diameter of the vent pipe
Three times the internal diameter of the vent pipe
What is the formula to determine the minimum height of the top of a vent pipe above the top of the overflow pipe?
V = 0.04H + 0.15
V = 0.15H + 0.04
V = 0.04H - 0.15
V = 0.15H - 0.04
In what type of circulation system does the minimum height of the vent pipe apply?
Gravity circulation systems
Forced circulation systems
Closed loop systems
Open loop systems
According to British Standards, what should be done if valves are found on the route of the vent pipe?
They must be removed
They must be adjusted
They must be replaced
They must be inspected
If the height (H) is 3 meters, what is the value of V?
0.27m
0.35m
0.45m
6.25m
If the volume (V) is 0.4 meters, what is the value of H?
0.27m
0.35m
0.45m
6.25m
What causes one-pipe circulation to occur in plumbing systems?
Hot water rising and cooling in the pipe walls
Cold water rising and heating in the pipe walls
Water remaining at a constant temperature
Water flowing horizontally in the pipe
Where does one-pipe circulation generally occur?
In closed-loop systems
In open-vent pipes from hot water storage cylinders
In horizontal pipes
In pipes with no water flow
What is a major cause of heat loss from hot water storage cylinders?
Water remaining stagnant
One-pipe circulation
Insulated pipes
High water pressure
Why is the hot water draw-off connection taken from the top of the cylinder?
To ensure the water is at its coldest
To prevent air from escaping
Because the water is at its hottest
To reduce water pressure
What is the minimum distance the hot water distribution pipe must be from the top of the cylinder to the vent?
300mm
450mm
600mm
750mm
What is the purpose of having a rise in the pipework?
To increase water pressure
To allow air to escape via the vent pipe
To decrease water temperature
To reduce pipe length
What is used to minimize heat loss in the plumbing system according to Building regulations part 'L'?
Ventilation
Insulation
Filtration
Evaporation
Why is it important to control the length of pipe used to deliver hot water to the outlet?
To increase water pressure
To avoid waste of cold water and cooling of hot water
To reduce noise
To prevent pipe corrosion
According to British Standards, what is the maximum length of a pipe with a diameter of 12–22mm before it becomes a 'dead leg'?
8m
10m
12m
15m
For pipes with a diameter of more than 28mm, what is the maximum length allowed by British Standards before it becomes a 'dead leg'?
2m
3m
4m
5m
What does the term "Active dead leg" refer to in plumbing?
A section of pipe that has been capped off
A term used to mean that a lot of cold water has to be drawn off before the hot water reaches the outlet
The connection to the cylinder for the secondary circulation
A system that uses time clocks to save energy
What is a "Passive dead leg" in plumbing?
A section of pipe that has been capped off and water cannot flow or be drained off
A term used to mean that a lot of cold water has to be drawn off
The connection to the cylinder for the secondary circulation
A system that uses time clocks to save energy
What is the purpose of secondary circulation in plumbing?
To ensure hot water reaches the outlet quickly
To prevent Legionella and bacterial growth
To connect to the cylinder in the top third, often using an Essex flange
To keep passive dead legs to a minimum length
What is the purpose of installing secondary circulation in a plumbing system?
To increase water pressure
To reduce water temperature
To ensure efficient circulation of hot water
To decrease pipe length
What material is the circulating pump made from to prevent corrosion?
Steel
Bronze
Plastic
Aluminum
Where does the return pipe in a secondary circulation system connect back to?
The main water supply
The furthest hot tap
The cylinder
The cold water tank
