AS NZS 2845.3 pdf download

AS NZS 2845.3 pdf download.Water supply — Backfow prevention devices
1.1  Scope
This Standard specifies requirements for field testing and maintenance of the following backflow prevention devices: (a) Registered break tank (RBT). (b) Registered air gap (RAG). (c) Pressure-type vacuum-breaker (PVB). (d) Spill resistant pressure vacuum-breaker (SPVB). (e) Reduce-pressure-zone device (RPZD). (f) Double check valve (DCV). (g) Reduced-pressure-detector assembly (RPDA). (h) Double check detector assembly (DCDA). (i) Single check valve (testable) (SCVT). (j) Single check detector assembly (testable) (SCDAT). (k) Atmospheric vacuum breakers (AVB). NOTE  Single check valve and single check detector assembly [Items (i) and (j)] do not apply to New Zealand). 1.2  Application This Standard shall be read in conjunction with the manufacturer’s instructions. The relevant legislation applies. NOTE 1  Testable devices should only be used where there is a maintenance program for device registration and test certification. NOTE 2  New Zealand requires backflow device installations to meet the New Zealand Building Code G12 and hazard identification requirements, regardless of any property compliance schedule set in place, or property type. 1.3  Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document: AS/NZS 2845.1, Water supply—Backflow prevention devices, Part 1: Materials, design and performance requirements AS 2845.2, Water supply—Backflow preventions devices, Part 2: Registered air gaps and registered break tanks AS/NZS 3500.0, Plumbing and drainage, Part 0: Glossary of terms AS/NZS 3500.1, Plumbing and drainage, Part 1: Water services 1.4  Terms and definitions For the purpose of this Standard, the terms and definitions given in AS/NZS 2845.1, AS 2845.2 and AS/NZS 3500.0 and those below apply. 1.4.1 downstream side where the water exits the backflow prevention device or where the water is moving to Note 1 to entry: For example, the direction/outlet of the water flow or the side where the water will be going to. 1.4.2 field testing operational checking (which may include measurements) to ascertain the level of performance of a backflow prevention device for the purpose of maintaining its specified performance 1.4.3 inspection close and careful scrutiny of an item carried out either without dismantling or with partial dismantling, supplemented by means such as measurement, in order to arrive at a reliable conclusion as to the condition of an item 1.4.4 maintenance regular routine technical and administrative actions, taken during an item’s service life, aimed at retaining it in a state in which it can perform its required functions 1.4.5 shall indicates that a statement is mandatory 1.4.6 should indicates a recommendation 1.4.7 upstream side where the water enters the backflow prevention device Note 1 to entry: For example, the source/inlet of the water flow.
2.1  Field testing
Field testing, which includes inspection, shall be carried out at the frequencies given in Table 1 for the nominated backflow prevention devices, and shall be performed in accordance with the applicable test appendices stipulated in Table 1. Equipment used for the field testing kit of backflow prevention devices shall be annually calibrated to the Metrology Society of Australia MSA Test Method 1 or Method 2 using — (a) traceable equipment; or (b) a testing laboratory or facility in accordance with AS ISO/IEC 17025.NOTE 1  For example, accreditation bodies which are signatories to the International Laboratory Accreditation Cooperation (ILAC) Mutual Recognition Arrangement (MRA) for testing laboratories may be able to offer accreditation against the requirements of AS ISO/IEC 17025. A listing of ILAC signatories is available from the ILAC website (www .ilac .org). In Australia and New Zealand, the National Association of Testing Authorities (NATA) and International Accreditation New Zealand (IANZ) are signatories to the ILAC MRA. NOTE 2  AS ISO/IEC 17025 can apply to first-party (i.e. manufacturer or supplier), second-party (i.e. user or purchaser) or third-party testing laboratories and facilities. NOTE 3  For MSA Test Method 1 or Method 2, the relevant test points should be 7, 10, 14, 20, 35, 50, 70 and 100 kPa. NOTE 4  A typical test kit arrangement is shown in Appendix B.