By American Water Works Association
This guide courses operators within the choice, set up, and upkeep of air valves in ingesting water provide purposes. insurance contains air valve kinds, valve position, valve orifice sizing, water hammer, install, operation, protection, and upkeep.
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Extra resources for Air-Release, Air/Vacuum & Combination Air Valves
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. Karassik, Igor J. et al. 1986. Pump Handbook, 2nd edition. McGraw Hill, New York. 33 Copyright (C) 2001 American Water Works Association All Rights Reserved INDEX Note: f. indicates figure; t. indicates table. Index Terms Links A Air entry into pipelines 2 in water 1 Air pockets 1 Air valves 1 See also Air-release valves, Air/ vacuum valves, Combination air valves aboveground 28 belowground 28 bolting material 28 and contamination 30 continuously operating 30 and decreased upslope 9 and deep-well pumps 9 depth of burial 30 and filling and draining pipelines 30 and flooding 30 and freezing 30 at high points 8 19 8f.
6 m) of clearance around and above the air valve for maintenance and valve removal. Screened Vents -T U Air-Release Precast Manhole ____ \ AirNacuum Valve Pipeline Connection \ Drain % Figure 6-2 Vault installation of a combination air valve Copyright (C) 2001 American Water Works Association All Rights Reserved 30 AIR-RELEASE, AIFUVACUUM, AND COMBINATION AIR VALVES Flooding Flooding submerges the air intake of air valves, prevents the proper operation of the valve, and may introduce contamination into the pipeline.
Where combination air valves are used, those in a single body are less likely to freeze than those in separate bodies. Freezing Suitable insulation and electrical heat tape should be provided in areas prone to freezing. 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.
Air-Release, Air/Vacuum & Combination Air Valves by American Water Works Association