By American Water Works Association
This guide courses operators within the choice, deploy, and upkeep of air valves in ingesting water provide functions. assurance comprises air valve forms, valve position, valve orifice sizing, water hammer, deploy, operation, defense, and upkeep.
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Extra info for Air-Release, Air/Vacuum & Combination Air Valves
Frozen air valves will not operate and can be damaged. Thermally activated relief valves (typically supplied in 3/8 or '/2 in. 19 mm or 13 mml diameter) can be installed on the valve body t o release water and reduce the possibility of damage from freezing. The relief valve automatically opens when the water temperature in the valve falls below a set point (typically 35°F [ Z O C l ) and recloses at higher temperatures. Contamination Valves with top-threaded openings should be protected with a protective cap, U-bend, or elbow to prevent rocks, sand, and other particles from falling into the valve.
Pipe1ine Fi I I ing Thread protectors and packing material should be removed from air valves prior to filling the pipeline. Copyright (C) 2001 American Water Works Association All Rights Reserved Bibliography Kroon, Joseph R. e t al. 1984. Water Hammer: Causes and Effects, Journal AWWA, November, pp. 39-45. O. 1994. Air In Pipe? Time to Review Air Valve Basics, Opflow, AWWA Vol. 20-3, March. E. 1972. Locating and Sizing Air-Release Valves, Journal AWWA, July. , et al. 1989. Pumping Station Design, Butterworth-Heinemann, Boston.
AWWA Standard for Air-Release, AirNacuum and Combination Air Valves for Waterworks Service, AWWA C512-92 (1st edition), Denver, Colo. Colorado State University. 1977. Concepts of Water Hammer & Air Entrapment in the Filling & Testing of Pipelines. Fort Collins, Colo. Dean, John A. 1992. Lange’s Handbook of Chemistry. McGraw Hill, New York. Edmunds, Robert C. 1979. Air Binding in Pipes, Journal AWWA, May, 1979. Flow of Fluids. 1982. Technical Paper No. 410, Crane. Giles, Ranald V. Fluid Mechanics and Hydraulics, (2nd edition) McGraw Hill, New York.