Domestic Hot Water Plumbing Systems Quiz

How can heat loss be minimized in a domestic hot water plumbing system?

• By leaving hot water in the pipe

• By reducing the temperature at the terminal fitting

• By increasing the length of pipe used

• By using insulation on the cylinder and pipework

According to BS6700, what is the maximum length of pipe before it becomes a dead leg for 22 - 28mm pipes?

• 5m

• 3m

• 12m

• 8m

What is the recommended temperature at a terminal fitting within 30 seconds after fully opening the terminal fitting?

• Less than 50oC

• More than 50oC

• Exactly 50oC

• Less than 40oC

What does the term 'active dead leg' refer to in a domestic hot water plumbing system?

• A section of pipe that has been capped off and water cannot flow or be drained off

• A lot of cold water has to be drawn off before the hot water reaches the outlet

• A section of pipe that retains heat effectively

• A section of pipe that is well insulated

What can occur in passive dead legs in a domestic hot water plumbing system?

• Corrosion of the pipes

• Reduced water flow

• Stagnant water

• Increased water pressure

Where should the connection to the cylinder for the secondary circulation be made?

• Outside the cylinder

• In the bottom third of the cylinder

• In the top third of the cylinder

• In the middle of the cylinder

What is the purpose of a trace heating element in a domestic hot water plumbing system?

• To reduce the water temperature

• To cool down the hot water in the pipes

• To prevent freezing of the pipes

• To increase the water pressure

According to BS8000 pt15, where should the hot pipe be installed in relation to the cold pipework?

• Below the cold pipework

• At the same level as the cold pipework

• Above the cold pipework

• Inside the cold pipework

What is the purpose of insulating hot water pipes in vulnerable places?

• To increase heat loss

• To reduce frost and freezing damage

• To increase heat transfer to the cold water pipes

• To reduce the water pressure

What should be used to protect plastic pipe locations in a domestic hot water plumbing system?

• Plastic tape

• Metal tape

• Cloth tape

• Rubber tape