AS 4809:2017 pdf download.Copper pipe and fittings- -Installation and commissioning.
4.3 Jointing materials
4.3.1 General
All jointing materials, including lubricants and sealing tapes used for drinking water applications, shall be in accordance with AS/NZS 4020.
All jointing materials used for gas applications shall be in accordance with AS/NZS 4645.1 and AS/NZS 5601 series.
4.3.2 Elastomeric rings
Elastomeric rings for water systems shall be in accordance with AS 1646 and be of dimensions, composition and hardness appropriate to the materials being joined and for the particular application.
Elastomeric seals for gas press fit shall be yellow hydrogenated nitrile butadiene rubber (HNBR) material and be in accordance with EN 549.
4.3.3 Gaskets
Elastomeric and fibre gasket materials shall be in accordance with WSA 109.
4.3.4 Silver brazing alloy
Silver brazing alloys for capillary jointing of copper and copper alloy pipes and fittings shall be in accordance with Table I or Table 2 of AS/NZS 1167.1 and contain a minimum of 1.8% silver and a maximum of 0.05% cadmium.
5 CORROSION, CONCEALMENT AND PROTECTION
5.1 Internal corrosion prevention
The service life of copper pipe installations may be compromised if used to convey water that falls outside the range nominated by the Australian Drinking Water Guidelines (ADWG) particularly in terms of pH, alkalinity, chloride, sulfate and residual disinfectant.
The composition of waters, other than from a reticulated water source that may also be used for drinking and re-use purposes, including treated, untreated, bore and rainwater supplies, should be examined to ensure compatibility with copper.
NOTE: Guidance on the types, causes and control measures of internal corrosion of copper pipes in drinking water is given in Appendix B.
5.2 External corrosion prevention
Copper has good corrosion resistance in most natural soils and atmospheric environments.
Copper pipework used to convey water below ground shall be laid in accordance with the AS/NZS 3500 series and suitably protected against external corrosion by means of using pre-insulated copper pipe, petrolatum-based wrapping or equivalent. All joins shall be wrapped with a durable inert waterproof tap. This will apply where copper pipes are in contact with such materials as— (a) ash; (b) sodium chloride (salt); (c) magnesite; (d) ammonia and its compounds or derivatives; (e) nitrates; (f) mercury salts; (g) foundry sands; (h) animal waste; urine; or any material identified as potentially aggressive to copper tube. Copper pipework shall not be used in atmospheres containing excessive hydrogen sulfide, unless the copper pipes can be protected using pre-insulated copper pipe, petrolatum-based wrapping or equivalent. All joins shall be wrapped with a durable inert waterproof tape. Corrosion protection of copper pipework used in gasfitting shall be in accordance with the above requirements or AS/NZS 4645.1 or ASINZS 5601 series.
5.3 Pipes in concrete
When there is no suitable alternative to embedding pipes in concrete walls or floors, they shall he located in chase or ducts with removable covers in accordance with the AS/NZS 3500 series, AS/NZS 4645.1 and AS/NZS 5601 series. All piping shall be Type A or Type B and covered over its complete length with an approved foamed plastic material. NOTE: Pipes should not extend through any expansion joint in the concrete. Proper provision shall be made for expansion of the concealed pipes and the connecting pipes outside the concrete structure.
5.4 Pipes under concrete
Pipes laid under concrete shall be Type A or Type B. Joints shall be kept to a minimum and pipes shall be either pre-insulated or placed in a watertight conduit in accordance with the AS/NZS 3500 series, AS/NZS 4645.1 and AS/NZS 5601 series. The ends of the conduit and pre-insulated pipe shall be sealed to prevent ingress of water. NOTE: See Clause 6.2.7.3 for water pipes under concrete slabs requirements.
5.5 Protection of copper pipes
Copper pipes shall be protected against damage caused by mechanical influences. Pipework installed externally shall be protected by providing mechanical guards where the service lines are exposed to— (a) vehicle impact; or structural movement.
6 WATER SUPPLY PIPING
6.1 Pre-installation considerations
6.1.1 Planning Planning considerations shall include calculating the correct pipe size for each part of the system to balance the inter-relationships of the following parameters: (a) Available mains pressure (consult the relevant Water Utility operation). (b) Pressure required at individual fixtures (refer to AS/NZS 3500.1 and AS/NZS 3500.4). (c) Static pressure losses due to height (refer to AS/NZS 3500.1 and AS/NZS 3500.4).AS 4809 pdf download.