GMJ 9189 phase 2 cold water pressure testing and flushing

What is the required internal water pressure for water fittings as per the Water Supply (Water Fittings) Regulations 1999?

• A. 1.1 times the maximum operating pressure

• B. 1.5 times the maximum operating pressure

• C. 2 times the maximum operating pressure

• D. 1.3 times the maximum operating pressure

According to WRAS guidance, what is the testing duration for rigid pipe systems without further pumping?

• A. 30 minutes

• B. 1 hour

• C. 2 hours

• D. 90 minutes

In BS EN 806, what is the formula for calculating the maximum design pressure (MDP)?

• A. 1.5 × maximum operating pressure

• B. 2 × maximum working pressure

• C. 1.65 × maximum operating pressure

• D. 1.1 × maximum operating pressure

For a system with a maximum working pressure of 5 bar, what is the test pressure recommended by BS EN 806?

• A. 7.5 bar

• B. 6.5 bar

• C. 8.25 bar

• D. 10 bar

During pre-commissioning checks, which of the following is NOT required?

• A. Checking that all joints are made correctly

• B. Ensuring adequate pipe supports

• C. Testing with maximum allowable pressure

What material requires pressure testing as per BS EN 806?

• Copper tubes

• Plastic pipes

• Steel pipes

• PVC pipes

In WRAS Test A for plastic pipes, what is the final step?

• Reducing pressure to one-third of the test pressure for 90 minutes

• Pumping for 1 hour

• No pressure drop for 120 minutes

• Checking for leaks at full pressure

What is the allowable pressure drop in WRAS Test B after the second 30 minutes?

• Less than 0.2 bar

• Less than 0.6 bar

• No drop allowed

• Less than 1.0 bar

What is the allowable pressure drop in WRAS Test B after the final 120 minutes?

• Less than 0.2 bar

• Less than 0.6 bar

• No drop allowed

• Less than 1.0 bar

After installing new pipework, what is the first step in the flushing process?

• • Open the kitchen tap

• • Drain water from the lowest point

• • Fill the system with water

• • Disinfect the system