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What is dezincification in plumbing materials?

• Leaching of aluminum from brass components

• Leaching of iron from steel components

• Leaching of zinc from brass components

• Leaching of copper from brass components

What is the cause of electrolytic corrosion in a plumbing system?

• Exposure to UV light

• High flow rate of water or gas

• Presence of flux in the pipes

• Contact between different metals in the presence of an electrolyte

What metal is used as a sacrificial anode in a hot water cylinder to prevent electrolytic corrosion?

• Copper

• Aluminum

• Magnesium

• Iron

What type of corrosion can occur on the inside of a copper tube if flux is not cleaned off during commissioning?

• Enamelling corrosion

• Blue water corrosion

• Erosion corrosion

• Pitting corrosion

What can increase erosion in hot and cold water pipework?

• Low flow rate

• High flow rate

• Presence of oxygen

• Exposure to sunlight

What can cause blue water corrosion in a new plumbing system?

• Exposure to UV light

• Presence of flux in the pipes

• High flow rate of water

• Standing dormant for a period while filled with water

What can degrade plastics in a plumbing system?

• Light, chemicals, and standing dormant

• Heat, UV, oxygen, light and chemicals

• Heat, oxygen, and light

• UV, oxygen, and chemicals

What is the effect of heat on plastics in a plumbing system?

• Thermal movement and distortion

• Yellowing of plastic

• Degrading due to oxygen

• Sunlight degrading

What is the effect of UV light on plastics in a plumbing system?

• Sunlight degrading

• Degrading due to oxygen

• Thermal movement and distortion

• Yellowing of plastic

What is the effect of oxygen on plastics in a plumbing system?

• Yellowing of plastic

• Degrading due to oxygen

• Thermal movement and distortion

• Sunlight degrading