CHAPTER 8 AND 9: Indirect waste and Vents

Which of the following can be directly connected to a drainage system?

• a) A relief vent from a water supply system

• b) A sump pump approved by the Administrative Authority

• c) A waste pipe carrying discharges under pressure

• d) None of the above

How can appliances with pumps or drainage outlets discharge waste?

• a) By connecting directly to a sewer line

• b) By using indirect waste pipes into an approved open receptor

• c) By discharging onto the ground

• d) By connecting to a drinking fountain drain

Under what condition may clean running water used as a cooling medium discharge into a drainage system?

• a) Only when directly connected

• b) If approved by the Department having jurisdiction

• c) Only if it discharges onto the ground

• d) If connected to a closed-loop cooling system

What must be done to chemical or industrial liquid waste before discharging into the drainage system?

• a) It must be neutralized or pretreated

• b) It must be diluted with clean water

• c) It must be mixed with regular sewage

• d) It can be discharged as-is

What is the primary purpose of vent pipes in a plumbing system?

• a) To provide water pressure

• b) To prevent siphonage and back-pressure in traps

• c) To store excess water

• d) To filter water before it reaches the sewer

When may vent piping be omitted on an interceptor?

• a) If the interceptor acts as a primary settling tank and discharges into a secondary interceptor

• b) If the plumbing system has no traps

• c) If the fixtures are used less than once a day

• d) If the building has a high water table

Which of the following materials CANNOT be used underground for vent pipes?

• a) Cast iron

• b) PVC

• c) Galvanized steel

• d) Copper

The cross-sectional area of all vent pipes in a building must be:

• a) Equal to the total number of fixture units

• b) Larger than the largest required building sewer

• c) Smaller than the largest soil stack

• d) Equal to the roof vent opening

How far above the roof must a vent pipe terminate?

• a) At least 10 cm

• b) At least 15 cm

• c) At least 30 cm

• d) At least 50 cm

How far must a vent opening be from an openable window, door, or air intake?

• a) At least 0.3 meters

• b) At least 0.6 meters

• c) At least 0.9 meters

• d) At least 1.2 meters