cold water ph23

How often should cold water storage cisterns be checked and cleaned?

• Every month

• Every six months

• Every year

• Every two years

Answer explanation

Cold water storage cisterns should be checked and cleaned every six months to ensure water quality and prevent contamination. This frequency helps maintain hygiene and system efficiency.

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

Answer explanation

Water treatment equipment should be maintained by both cleaning it to remove scale and sediment build-up and checking it according to the manufacturers' literature. Therefore, the correct answer is both A and B.

What should be checked when commissioning a pump?

• Pump inlet filter

• Valves

• Pipework for leaks

• All of the above

Answer explanation

When commissioning a pump, it's essential to check the pump inlet filter, valves, and pipework for leaks. All these components ensure the pump operates efficiently and safely, making 'All of the above' the correct choice.

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

Answer explanation

Accumulators should be checked by measuring the vessel's pressure with a gauge, as this indicates their functionality and ensures they are operating within safe pressure limits.

What should be checked during a visual inspection of pipework?

• Sagging

• Corrosion

• Water hammer

• All of the above

Answer explanation

During a visual inspection of pipework, it's essential to check for sagging, corrosion, and water hammer. All these factors can indicate potential issues, making 'All of the above' the correct choice.

How often should TMVs be checked and cleaned?

• Every month

• Every six months

• Every year

• Every two years

Answer explanation

TMVs should be checked and cleaned every year to ensure optimal performance and safety. Regular maintenance helps prevent issues and prolongs the lifespan of the valves.

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

Answer explanation

The correct choice is to contact the water undertaker for accurate information on supply pressure and to use a pressure gauge at the kitchen sink, as it provides a direct measurement of the cold water supply pressure.

Which formula can be used to determine flow rates through a pipe?

• Q = Av

• Q = A-v

• Q = m/s

• Q = V2

Answer explanation

The formula Q = Av represents the flow rate (Q) as the product of the cross-sectional area (A) of the pipe and the flow velocity (v). This is the correct choice for determining flow rates through a pipe.

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

Answer explanation

The correct choice is 50 years at 20C and 10 bar, as it aligns with standard guidelines for cold water systems, ensuring durability and safety under specified conditions.

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

Answer explanation

The recommended storage capacity for a cold and hot water supply to a house is 230 litres minimum. This ensures adequate supply for daily needs, balancing both hot and cold water requirements effectively.