Specifications
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STANDARD SPECIFICATION - BUILDINGS
DPI REFERENCE TEXT - APRIL 2009
PAGE 32
16.9 WASTEWATER
General
Standard To AS/NZS 3500.2 or AS/NZS 3500.5.
Materials: UPVC drainage pipes, type DWV.
Waterless composting toilets: To AS/NZS 1546.2
On site domestic wastewater treatment units: To
AS/NZS 1546.3.
Cleaning
During construction, use temporary covers to
openings and keep the system free of debris. On
completion, ush the system using water and leave
it clean.
Septic tanks
Precast concrete or glass bre reinforced plastic
septic tank: To AS/NZS 1546.1.
Efuent disposal: To AS/NZS 1547 and the
requirements of the Environmental Health Branch
of the Department of Health and Community
Services.
Vent pipes
Staying to roof: Do not penetrate the roof covering,
x the stays at roong screws.
Terminations: Provide bird-proof vent cowls made of
the same material and colour as the vent pipe.
16.10 FRESH WATER
Standards
General: To AS/NZS 3500.1 and AS/NZS 3500.5.
Tap positions
Locate hot tap to the left of, or above, the cold water
tap.
Accessories
Provide the accessories and ttings necessary for
the proper functioning of the plumbing systems,
including taps, valves, outlets, pressure and
temperature control devices, strainers, gauges and
pumps.
Water Heaters
Electric water heaters: To AS/NZS 4692.1
Minimum energy performance: To AS/NZS 4692.2
Gas hot water heaters: To AS 4552
Oil red heaters: To AS 1691.
Solid fuel heaters: To AS/NZS 2918.
Heater installation
Location: Locate water heaters where they can be
maintained or replaced without damaging adjacent
structures, xtures or nishes.
Solar water heater
Design and construction: To AS 2712.
Use a proprietary automatic water heater
comprising solar collector and storage container,
with supplementary heating unit, including the
connections, controls and ttings necessary for the
proper functioning of the system.
Manufacturer: Solahart 302L with 4 m
2
solar
collectors for houses and 180L with 2 m
2
solar
collectors for units. Use D models in corrosive
water areas.
Installation: To AS 2441. Provide swing out arms
where necessary.
16.12 GAS
Standard
General: To AS 5601 and AS/NZS 1596.
Installation
Install pipework in straight lines and uniform grades.
Keep the number of joints to a minimum. Prevent
direct contact between incompatible metals.
Conceal pipes where possible.
Accessories: Provide the accessories and ttings,
necessary for the proper functioning of the gas
system.
Buried pipes
Warning tape: During backlling, lay plastic warning
tape above and for the full length of buried gas
pipes.
Type: Minimum 100 mm wide, with “GAS PIPE
UNDER” marked continuously.
Certicate of appliance - Hold Point
Hold Point: Submit a certicate from the manufacturer
stating that the appliance meets with AGA/ALPGA
approval for operation with the type of gas to be
used.
Gas bottles
Provide 2 x 45 kg gas cylinders with a manual
change over valve. Locate where shown on the
drawings or as directed on a concrete pad.
16.11 FIRE HOSE REELS
Standard: To AS/NZS 1221.
Reel Type: Reel drum mounting bracket,
independent of the supply pipe.
Hose: 36 m hose with metal nozzle for jet and
spray.
Electric Water Heater
Provide and electric water heater wall mounted in
the position shown on the drawings or as directed.
Proprietary Item: Hardies Dux 50 litre. Model
HDE50V.
Temperature
Maximum temperature at ablution outlets: 50
o
C.
Maximum temperature at kitchen sinks and laundry
tubs: 60
0
C
Isolating valves
Provide isolation valves to water heaters.
Cleaning
On completion, ush the pipelines using water and
leave them clean.
Rainwater Tanks
Standards
Metal tanks and rainwater goods: To AS/NZS
2179.1
Design and Installation: To the recommendations of
SAA HB 230.
Polyethylene Tanks: AS/NZS 4766.
PLUMBING & DRAINAGE
Specifications March 2009.indd 32 11/03/2009 11:47:12 AM