Drainage 25

Which building regulation must sanitation systems comply with?

• Part G

• Part H

• Part F

• Part L

What is the correct pressure for the soundness testing of above-ground drainage systems?

• 21 mm

• 28 mm

• 32 mm

• 38 mm

What is the minimum trap seal depth for a bath?

• 25 mm

• 50 mm

• 75 mm

• 100 mm

What is the maximum length of waste pipe from a bath when connecting to a primary vented stack?

• 1.7 m

• 3 m

• 5 m

• 6 m

When a stack is installed within 3 m of an openable window, what minimum distance above that window should it terminate?

• 300 mm

• 500 mm

• 900 mm

• 1000 mm

What type of trap is shown in the image below?

• Bath trap

• In-line trap

• Waterless trap

• Washing machine trap

What problem can be caused by the use of short-radius bends at the bottom of discharge stacks?

• Compression

• Evaporation

• Excessive velocity

• Induced siphonage

Where a branch connection into a stack is between 82 mm and 160 mm in diameter (e.g. a WC branch), no other connection is allowed to be installed within which of the following distances vertically downwards?

• 90 mm

• 110 mm

• 200 mm

• 250 mm

Which of the following British Standards offers specific guidance on the space requirements for sanitary appliances?

• BS 6465–2

• BS 3943

• BS 12056–2

• BS 4305

What is the cause of loss of trap seal in the image below?

• Self-siphonage

• Compression

• Evaporation

• Capillary action