Unit 305 Testing & Commissioning

Open Ended

What are some key steps involved in preparing a hot water system for soundness testing and commissioning?

Multiple Choice

Why is it important to test and commission hot water systems before they are put into operation?

• To ensure safety and compliance with industry standards

• To reduce installation costs

• To speed up the installation process

• To avoid using system additives

Multiple Choice

Which certificate must be issued for all installations to ensure compliance with Building Regulations?

• Benchmark certificate

• Building Regulations Compliance Certificate

• Domestic Heating Compliance Guide

• Manufacturer’s instructions

Open Ended

After a system has been tested and commissioned, what documentation must be handed over to the customer?

Multiple Choice

Which of the following statements about soundness testing of water fittings is correct?

• Water fittings should withstand a pressure equal to the maximum operating pressure.

• Water fittings should withstand an internal water pressure of at least 1.5 times the maximum operating pressure.

• Soundness tests are only required for underground pipework.

• Defects found during soundness tests do not need to be rectified.

Multiple Choice

According to WRAS guidance G12.2, what must happen during the one-hour period after the test pressure is applied to rigid pipework?

• The pressure should drop below the test pressure.

• Visible leakage is acceptable.

• The pressure must not drop below the test pressure and there should be no visible leakage.

• Further pumping is required throughout the hour.

Multiple Choice

When testing rigid pipe systems, what should be done to all outlets and float operated valves before increasing water pressure?

• Leave them open

• Seal all outlets and cap off or isolate float operated valves

• Increase pressure without sealing

• Disconnect all valves

Multiple Choice

According to BS EN 806, what is the recommended pressure at which plumbing installations and fittings should be tested, and how does this compare to the Water Supply (Water Fittings) Regulations requirement?

• 1.1 times the maximum working pressure, which is lower than the Water Fittings Regulations

• 1.5 times the maximum working pressure, which is higher than the Water Fittings Regulations

• 1.1 times the maximum working pressure, which is higher than the Water Fittings Regulations

• 1.5 times the maximum working pressure, which is lower than the Water Fittings Regulations

Open Ended

Explain the difference between the maximum design pressure (MDP) and the maximum operating pressure as defined in BS EN 806.

Multiple Select

Which of the following statements about BS EN 806 Part 4 soundness test requirements is/are correct?

• The test pressure should be 1.1 times the maximum design pressure.

• The statutory minimum required by Water Fittings Regulations is 1.5 times the maximum operating pressure.

• BS EN 806 requires a lower test pressure than UK national requirements.

• A fitting must be pressure tested at 1.65 times the maximum operating pressure.

Open Ended

List the steps involved in conducting a soundness test for rigid pipework according to BS EN 806.

Open Ended

Why are the test procedures for plastic pipes different from those for rigid pipes, and what is the purpose of these differences?

Multiple Choice

Which of the following steps is NOT part of the procedure for Test type B for plastic pipes?

• Pump the system up to the required pressure and maintain for 30 minutes

• Check the pressure after a further 30 minutes

• Visually check for leakages for 120 minutes

• Increase the pressure if loss is detected

Multiple Choice

What should be checked and rectified before pressure testing a pipe installation?

• Pipe material

• Pipe color

• Joint integrity and installation conformity

• Water temperature

Open Ended

Explain why it is necessary to flush a new water service pipe before putting it into use.

Multiple Select

Which of the following are steps in the flushing procedure for newly installed pipes?

• Open all terminal fittings to produce high flow

• Allow water to run until visually clear

• Confirm water clarity using a clear vessel

• Add chlorine to the water

Multiple Choice

After flushing, what is the minimum free residual chlorine level required for successful disinfection at the end of one hour?

• 10ppm

• 20ppm

• 30ppm

• 50ppm

Multiple Choice

Which of the following steps is NOT part of the commissioning process after disinfection, according to the manufacturer's instructions?

• Testing temperatures

• Testing flow rates

• Testing pressures

• Visual inspection

Open Ended

Describe the sequence of steps involved in the whole process of installing and commissioning a water system, as shown in the diagram.

Multiple Select

Which of the following statements about hard water and water softeners is/are correct?

• A water softener removes calcium carbonates from hard water.

• The feed to the kitchen sink is treated by the water softener.

• The customer must refill the softener with salt tablets.

• A water softener is connected to the rising mains in the property.

Open Ended

Explain why a neutraliser pack and a primary pipework inhibitor may be necessary in a hot water system.

Multiple Choice

Which of the following is a requirement for flushing new and existing hot water systems according to industry standards?

• Use of system additives

• Ignoring system additives

• Partial flushing only

• No flushing required

Open Ended

Reflecting on today's session about hot water systems, what is one key aspect of testing and commissioning that you would like to learn more about or found most challenging?