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Worksheetscold water ph23
Total questions: 30
Worksheet time: 16mins
How often should cold water storage cisterns be checked and cleaned?
Every month
Every six months
Every year
Every two years
How should water treatment equipment be maintained?
Cleaned and cleared of scale and sediment build-up
Checked in accordance with the manufacturers' literature
Both A and B
None of the above
What should be checked when commissioning a pump?
Pump inlet filter
Valves
Pipework for leaks
All of the above
How should accumulators be checked?
By checking the vessel's pressure with a gauge
By inspecting for leaks
By checking for water damage
By checking the flow rates
What should be checked during a visual inspection of pipework?
Sagging
Corrosion
Water hammer
All of the above
How often should TMVs be checked and cleaned?
Every month
Every six months
Every year
Every two years
How can the cold water supply pressure to a property be identified?
By contacting the local council or using a weir gauge at the kitchen sink
By contacting the local council or using a pressure gauge at the supply to the FOV
By contacting the water undertaker or using a pressure gauge at the cistern-fed outlets
By contacting the water undertaker or using a pressure gauge at the kitchen sink
Which formula can be used to determine flow rates through a pipe?
Q = Av
Q = A-v
Q = m/s
Q = V2
According to guidance, all pipes and joints of a cold water system should be designed for a service life of:
25 years at a temperature of 20C and a design pressure of 15 bar
50 years at a temperature of 20C and a design pressure of 10 bar
25 years at a temperature of 25C and a design pressure of 10 bar
50 years at a temperature of 25C and a design pressure of 5 bar
What is the recommended storage capacity of a CWSC supplying cold and hot water to a house?
100 litres minimum
150 litres minimum
230 litres minimum
350 litres minimum
What is the recommended flow velocity of cold water within pipework?
Between 0.25m/s and 1.5m/s
Between 0.5m/s and 2m/s
As close as practically possible to 2.5m/s
As close as practically possible to 3.5m/s
Which of the following factors would not directly affect the pressure and flow rates of pipework?
Pipe diameter
Pipe material
Number of bends
pH level of the water supply
What should be fitted to the water supply feeding an accumulator to prevent the latter becoming damaged?
Strainer, check valve and pressure reducing valve
Strainer, check valve and gauge
Check valve, pressure relief valve and gauge
Check valve, water softener and regulating valve
If the mains pressure to an accumulator is 3 bar, then what would be the most suitable air charge pressure within the vessel?
3 bar
2.5 bar
1.5 bar
0.5 bar
A boosted cold water system is fitted with a break cistern at low level and a storage cistern at high level. The pump seems to have seized after 'running dry' for some time. What control component within the system is most likely to have failed and allowed this to happen?
Float operated valve within the storage cistern
Float operated level shut-off switch within the storage cistern
Float operated valve within the break cistern
Float operated low level shut-off switch within the break cistern
A CWSC is overflowing during off-peak periods. What is the most likely cause?
Blocked distribution pipe outlet
Faulty level switch
Split washer within FOV
Pressure reducing valve set too high
A sentinel outlet may be described as:
a tap at the mid-position within a system
the taps at the furthest and closest locations to the supply
the taps at the highest and lowest points
A tap outlet which is operated the least frequently
What piece of test equipment is most suitable to check the run current of a boost cold water pump during maintenance or fault-finding activities?
Voltmeter
Multi-meter
Low resistance Ohmmeter
Clip-on Ammeter
Why is it important to check the available incoming pressure when selecting a water supply system?
To determine the cost of water supply installation
To estimate the water consumption rate
To ascertain the minimum available pressure during peak demand
To calculate the volume of water storage required
How can you determine the head of pressure in a cistern-fed water supply system?
By measuring the distance from the base of the cistern to the outlet
By analyzing water quality tests
By checking the water meter reading
By contacting the water undertaker
What is a system used to estimate the likely demand for water supply based on?
Gallons per minute (GPM)
Cubic meters per second (m³/s)
Loading Units (LU)
Liters per hour (L/hr)
Why is it important to consider the number and position of appliances when assessing water demand?
To determine the color of the appliances
To calculate the energy consumption of the appliances
To estimate how often appliances will be used
To identify the brand of appliances
In a situation where there are more outlets and appliances on an installation, what tends to happen regarding their usage?
More appliances are used simultaneously
Fewer appliances are used simultaneously
Usage remains the same regardless of the number of appliances
The number of appliances has no impact on usage
Which type of flow is promoted by smooth pipe surfaces, as opposed to turbulent flow?
Subsonic flow
Supersonic flow
Laminar flow
Oscillatory flow
Compared to copper pipes, why does plastic pipe typically have a slightly better flow rate?
Plastic pipe has a rougher internal bore.
Plastic pipe is more prone to corrosion.
Plastic pipe has a smoother internal bore.
Plastic pipe is more rigid.
In the equation Q = A * v, what does "Q" represent?
Pipe diameter
Flow rate
Pipe length
Velocity
If the velocity of water in a pipe decreases, what typically happens to the flow rate?
The flow rate increases.
The flow rate remains constant.
The flow rate decreases.
The flow rate becomes zero.
Fluid category 1 represents:
a serious health risk
a significant health risk
a slight health risk
no health risk
What is the maximum depth at which a water main service pipe should be laid at?
750mm
1,250mm
1,350mm
1,750mm
In an indirect boosted cold water system, what is the name of the low level cistern which is filled by the cold water main?
Feed and expansion cistern
Cold water storage cistern
Spill cistern
Break cistern
