Design and Construction Standards - Tualatin Valley Water District
Design and Construction Standards - Tualatin Valley Water District
Design and Construction Standards - Tualatin Valley Water District
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<strong>Water</strong> System <strong>Design</strong> <strong>and</strong> <strong>Construction</strong> St<strong>and</strong>ardsTable of Contents7.2 Vault Materials .............................................................................................................................. 7-1b. Precast Concrete Vaults .............................................................................................................. 7-1c. Ladders ........................................................................................................................................ 7-1d. Drainage ....................................................................................................................................... 7-2e. Sumps .......................................................................................................................................... 7-2f. Sidewalk Door .............................................................................................................................. 7-2g. Vault Joints ................................................................................................................................... 7-3h. Grout <strong>and</strong> Dampproof Coatings .................................................................................................. 7-37.3 Vault Installation ........................................................................................................................... 7-3d. Pipe Penetrations ........................................................................................................................ 7-38. Backflow Prevention General Requirements8.1 Purpose <strong>and</strong> General Requirements ........................................................................................... 8-18.2 Cases Where Backflow Prevention Assemblies are Required ................................................... 8-18.3 Types of Backflow Preventers ...................................................................................................... 8-28.4 Installation of Double Check Valve Assemblies <strong>and</strong> Reduced Pressure Backflow Assemblies8-4a. Installation Locations .................................................................................................................. 8-4b. Meter Boxes for Assemblies ....................................................................................................... 8-4c. Below Grade Vault Installation ................................................................................................... 8-5d. Above Ground Installation ........................................................................................................... 8-58.5 Installation of Double Check Detector Assemblies <strong>and</strong> Reduced Pressure Detector Assemblies8-6a. General Requirements ................................................................................................................ 8-6b. Detector Meters ........................................................................................................................... 8-6c. Below Grade Vault Installation ................................................................................................... 8-7d. Above Ground Installation ........................................................................................................... 8-78.6 Installation of Pressure Vacuum Breaker, Spill-Resistant Vacuum Breaker, <strong>and</strong> AtmosphereVacuum Breaker Assemblies ....................................................................................................... 8-7a. Grade Requirements ................................................................................................................... 8-78.7 Installation of Air Gaps .................................................................................................................. 8-7a. General Requirements ................................................................................................................ 8-7List of TablesTable 1. Maximum Allowable Deflection of DI PIPE Joints (18-foot pipe length) 1, 2 ............... 3-2Table 2. Acceptable Tapping Sleeves ........................................................................................ 3-6Table 3. Hypochlorite Solution ................................................................................................ 3-12Table 4. Required Meter Boxes .................................................................................................. 6-3Table 5. Required Angle Valves ................................................................................................. 6-3Table 6. Suggested Meter Boxes ............................................................................................... 8-4TVWD <strong>Water</strong> System St<strong>and</strong>ards June 2012 Page iv
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