Cold Water Systems LO5

Reorder the following

• Flushing out

• Disinfecting

• Hand over to the customer

• Soundness test

• Visual inspection

Soundness test(Rigid pipe): Slowly fill the system, walking around the system to check for ​ (a)   . Leave the system full for ​ (b)   before attaching the test bucket. Pump the system up to ​ (c)   the working pressure and leave for ​ (d)   , there should be ​ (e)   in pressure.

• leaks
• 30 minutes
• 1.5x
• 1 hour
• no drop
• open ends
• 45 minutes
• 1.5 hours
• 2 hours
• min. 0.2 bars drop

What is the total time for soundness testing on TEST A for plastic pipe?

• 45 minutes

• 60 minutes

• 90 minutes

• 105 minutes

After the soundness test is complete, how long is the system disinfected for?

• 30 minutes

• 45 minutes

• 60 minutes

• 90 minutes

Bacterial growth is due to ​ (a)   of water. Legionella is dormant and comes from natural sources of water, but will become active and start to grow in water temperatures between ​ (b)   and ​ (c)   . Water that is allowed to be still is perfect for the growth at room temperature. This is one of the main reasons to ensure the system has some type of ​ (d)   .

• stagnation
• 20°C
• 46°C
• circulation
• decontamination
• disinfection
• 65°C
• 100°C

What is the total time for soundness testing on TEST B for plastic pipe?

• 30 minutes

• 90 minutes

• 120 minutes

• 150 minutes

Scenario: You are hired to remove the customers old bathroom and replace with an updated suite. You will need to decommission the system in order to complete your work. What type of decommission would this be?

• Permanent desommissioning

• Induced decommissioning

• Temporary decommissioning

• System commissioning

On an indirect cold water system, which drain off would need to be used to drain down the system to work on a wash hand basin in the bathroom?

• Drain off on the incoming mains

• Drain off below the boiler

• Drain off next to the hot water cylinder

• Drain off on the cold water pipe next to the bathroom WC

Where would you find the details for pipework testing procedures?

• BS 6635

• BS 8000

• BS 5412

• BS 6700

The working pressure for a rigid pipework system was designed to be 5 bar. What should the test pressure be?

• 6.5 bar

• 7 bar

• 7.5 bar

• 8 bar