Plumbing level 2 - PP 2.2 - Drainage

What is a common reason for trap seal loss due to leaks?

• Wind passing over the soil stack

• Capillary action

• Rubber seals not being watertight

• Large amount of water discharged

What is a simple reason for trap seal loss commonly experienced in warmer climates?

• Evaporation

• Compression

• Induced siphonage

• Self-siphonage

What can assist with the problem of wavering out?

• Wind cowl

• Anti-vac trap

• Increasing waste pipe diameter

• Long radius bend

What causes trap seal loss due to momentum?

• Capillary action

• Wind passing over the soil stack

• Water evaporating out

• Large amount of water suddenly discharged

What happens when a WC is discharged from the first floor and the stack has a tight radius at the base?

• Compression

• Induced siphonage

• Evaporation

• Self-siphonage

What generally happens in S traps when long fibres or hairs get caught over the top of the weir?

• Evaporation

• Compression

• Capillary action

• Self-siphonage

What is the easiest way to overcome self-siphonage in basins?

• Anti-vac trap

• Long radius bend

• Increasing waste pipe diameter

• Wind cowl

What is the recommended branch discharge pipe diameter for multiple appliances?

• 75mm

• 40mm

• 32mm

• 50mm

What is a common cause of trap seal loss due to incorrect fall?

• All of the above

• Waste pipe diameter is too small

• Waste pipes are too long

• No long radius bend