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ASME A112.18.3-2002 pdf download

1 PURPOSE The purpose of this Standard is to establish perform- ance requirements and statistically valid evaluation methods including durability tests for the manufacture of safe, efficient, and reliable backflow protection devices and systems for plumbing fixture fittings. Alternative designs or configurations which comply with the intent of this Standard shall be permitted. 2 SCOPE This Standard addresses functional performance and requires physical characteristics of devices and systems which provide backflow protection consistent with the level of risk associated with the plumbing fixture fitting application. The Standard establishes specific perform- ance criteria and provides the test methods to prove compliance. It is applicable to all plumbing fixture fit- tings with outlets not protected by an air gap. 3 REFERENCE STANDARDS The following documents form a part of this Standard to the extentspecified herein. The latestissue shallapply. ASTM D 1193, Specification for Reagent Water Publisher: The American Society for Testing and Materi- als (ASTM), 100 Barr Harbor Drive, West Consho- hocken, PA 19428 ASME A112.1.2, Air Gaps in Plumbing Systems ASME A112.18.1, Plumbing Fixture Fittings ASME PTC 19.2, Supplement on Instruments and Appa- ratus, Part 2 Pressure Measurement Publisher:The American Society of Mechanical Engi- neers (ASME International), Three Park Avenue, New York, NY 10016-5990 ANSI/ASSE 1001, Pipe Applied Atmospheric Type Vac- uum Breakers ANSI/ASSE 1011, Performance Requirements for Hose Connection Vacuum Breakers ANSI/ASSE 1014, Performance Requirements for Hand- Held Showers ANSI/ASSE 1025, Performance Requirements for Diverters for Plumbing Faucets With Hose Spray, Anti-Siphon Type, Residential Applications ANSI/ASSE 1052, Hose Connection Backflow Pre- ventors 1 ASSE 1012, Performance Requirementsfor BackflowPre- venters With Intermediate Atmospheric Vent ASSE 1013, Performance Requirements for Reduced Pressure Principle Backflow Preventers ASSE 1019, Vacuum Breaker Wall Hydrants, Frost Resis- tant Automatic Draining Type ASSE 1035, Performance Requirements for Laboratory Faucet Vacuum Breakers ASSE 1056, Performance Requirements for Back Siphon- age Backflow Vacuum Breakers Publisher: The American Society of Sanitary Engi- neering, 2890 Clemens Road, Suite 100, West Lake, OH 44145 AWWA C511, Reduce Pressure Principle Backflow Pre- ventor Assembly AWWA 10079, Standard Methods for the Examination of Water and Wastewater Publisher: The American Water Water Works Associa- tion (AWWA), 6666 West Quincy Ave., Denver, CO 80235 CSA B 64, Backflow Preventers and Vacuum Breakers CSA B 125, Plumbing Fittings Publisher: CSA International, 178 Rexdale Blvd., Toronto, Ontario, Canada M9W1R3 4 DEFINITIONS Nomenclature and definitions applicable to faucets, fixture fittings, and backflow requirements shall be as follows: acceptance sampling plan: the correlation of sample size and allowed failure rate. air gap: the unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe or faucet and the flood-level rim of a receptor. See ASME A112.1.2. approved: accepted by the authority having jurisdiction backflow: the reversal of flow direction from that nor- mally intended. Back siphonage is one type of backflow. Back pressure backflow is another type. backflow prevention system: any mechanical system, con- sistingoftwo ormore devices, designed to automatically prevent an unintentional reversal of flow in a potable water distribution system. A backflow prevention sys- tem prevents back siphonage and back pressure backflow.
potable water: water which is suitable for drinking and free from impurities present in amounts which are suffi- cient to cause disease or harmful physiological effects. random sample: a sample taken in a manner which gives every item in the lot, or every portion of the lot for bulk materials, an equal probability of being selected as part of the sample. sample: the number ofspecimens selected from a produc- tion lot as representative of that lot. sampling scheme, multiple: a sampling method in which, after each sample is inspected, the decision is made to accept a lot, to rejectit, or to take another sample, the test resultofwhichshall be added to thatofthe previous one. shampoo fitting: a hose and spray assembly for attach- ment to a wall outlet or lavatory fitting. specimen: an individual component which combined with others makes up a required sample. upper confidence limit: the maximum probable percentage of individual safety devices subject to backflow in the field under those conditions defined in the life test. vacuum breaker: a device or means to prevent back siphonage by allowing air to enter a fitting. vent to air: a backflow prevention device which opens a fitting or part of a fitting to the atmosphere.

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