Water Supply

Question 1

Hazard level: soda water dispenser

Question 2

hazard level: swimming pool

Question 3

hazard level: An auxilary water supply

Question 4

Hazard level: Garden Hose (note that any homeowner can attach a fertilizer or pesticide dispenser)

Question 5

Water pressure:. If there was 8.5m pressure head at the boundary, what would be the equivalent available pressure in kPa?

Question 6

Pressure head: If there was 9m pressure head at the boundary where the water service entered the property and the water pipe was buried 1m below ground what would be the available pressure in kPa on the first floor? (Hint: disregard pressure losses, the first floor is 2m above the ground)

Question 7

What device would be suitable for a garden hose?

Pressure Vacuum Breaker
Single Check Valve
Reduced Pressure Zone
Air Gap
Atmospheric Vacuum Breaker

Question 8

What Hazard Level would Dentist Chair be rated for sizing a BFPD?

Question 9

What device would be suitable for a Header Tank (cistern)?

Single Check Valve
Atmospheric Vacuum Breaker
Air Gap
Reduced Pressure Zone
Pressure Vaccum Breaker

Question 10

Name likely places that an Isolation valve would be located for a dwelling (See G12):

At the boundary
Under a sink
Where the water service enters the building
Upstream of a water storage heater
Under a toilet

Question 11

Which of the following pipe materials can be used for potable water, is commonly used in NZ and can be used for hot and cold water?

Galvanized Steel
ABS
PVC - C
Polybutylene

Question 12

What is the maximum temperature hot water is set at in an early childhood centre?

Question 13

What is the maximum temperature hot water is set at in a Senior’s Home (with nursing care)?

Question 14

What is the typical size of an incoming water service for a house?

Question 15

Back siphonage happens when potable water is pushed back into the mains due to high pressures inside the dwelling’s water lines eg. from a HWC.