Hot Water Systems 1.7 Quiz

What is the main cause of unwanted ticking and creaking noises in hot water systems?

• Chemical reactions

• Temperature fluctuations

• Water pressure variations

• Expansion and contraction of pipework

What is the coefficient of thermal linear expansion for plastic pipe?

• 0.00018m/m/oC

• 0.000016m/m/oC

• 0.00020m/m/oC

• 0.00015m/m/oC

Which type of pipe material expands more than copper or steel?

• Steel

• Polybutylene

• Cross-linked polyethylene

• Copper

What is the expansion in a 20m run of plastic pipe with a temperature variation of 65oC?

• 0.23m or 230mm

• 0.03m or 30mm

• 0.18m or 180mm

• 0.16m or 160mm

Expanding and contracting pipework can create what?

• Corrosion in the pipework

• Reduced pipe flexibility

• Increased water pressure

• Unwanted ticking and creaking noises