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4. A building has four 100 mm discharge stacks, which connect into a com-
mon underground drain. The stacks have discharge unit values of 400,
500, 600 and 700. Find the diameters of each part of the collecting drain if
it has a gradient of 1 in 100.
5. A 100 mm PVC drain runs for 30 m to connect between a discharge stack
and the sewer. If its gradient is 1 in 80 and it commences its route with
minimum ground cover under a garden, what will its invert be at the sewer
connection if the ground is level?
6. There are 236 houses on a new development. Each has a group of sanitary
appliances with a discharge unit value of 14. The common drain is laid at a
gradient of 1 in 100. Find the diameter of the common drain and the
maximum possible number of houses that it could serve.
Block D
Creative work
Draw a suitable sanitary pipework installation for a 10-storey block of
flats with two groups of appliances on each floor connected to one
stack. Show pipe sizes and routes.
Chapter 6
Gas
Block A
Key terms and concepts:
density
flue systems
gas burner controls
gas flow rate
gas meter
gross calorific value
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