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Code of Jefferson City

Table of Contents » Title 18 Water and Sewers » Chapter 4 Cross Connections, Auxiliary Intakes, Etc. » § 18-410 Reduced pressure backflow prevention devices installation criteria.
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18
Title 18
18-1
Title 18, Chapter 1
18-101
§ 18-101
Jefferson City
Title 18 : Water and Sewers
Chapter 4 : Cross Connections, Auxiliary Intakes, Etc.

18-410 : Reduced pressure backflow prevention devices installation criteria.

  1.  
     
    1. General. All backflow prevention devices will be inspected to verify that the units meet the following requirements and tested to verify that the installed units meet the performance requirements as set forth in the 9th edition of the Manual for Cross-Connection Control published by the Foundation for Cross-Connection Control and Hydraulic Research - University of Southern California (FCCCHR, 1993) before they will be accepted by Jefferson City Water Supply. It is encouraged that a water system representative be asked to visit the site to review details of the proposed installation prior to work.
    2. Requirements.
      1. Specifications and detailed drawings shall be submitted to and approved by Jefferson City Water Supply prior to the installation of any device.
      2. All devices shall be installed pursuant to Jefferson City Municipal Code title 18, chapter 4 and the Tennessee Department of Environment and Conservation, Division of Drinking Water Supply, Cross-Connection Control Manual rules and regulations.
      3. All devices shall be installed in accordance with the manufacturer's installation instructions, and shall possess all test cocks and fittings required for testing the device. The University of Southern California and Jefferson City Water Supply specifications can supersede the manufacturer's installation instructions. All fittings shall permit direct connection to Jefferson City Water Supply test devices.

      4. Brass test fittings need to be installed in test cocks.

        Brass fittings required for backflow preventers:

        (These fittings should be installed with Teflon tape, not plumber's cement.)

        Contact JCPW at 865-475-6617 when devices have been repaired or installed.

      5. The entire device, including test cocks and valves, shall be easily accessible for testing and repairs.
      6. The pipeline must be thoroughly flushed to remove foreign material and debris before installing the device.
      7. Duplicate units, installed in parallel, shall be provided in cases where the water supply cannot be interrupted for routine testing and maintenance of a single-unit installation.
      8. Reduced pressure backflow prevention devices shall be located a minimum of twelve inches (12") plus the nominal diameter of the relief port above the floor surface or flood plain. Maximum height above the floor surface shall not exceed sixty inches (60").
      9. Clearance of device from wall surfaces or other obstructions shall be a minimum of six inches (6") on the back side and a minimum of twenty-four inches (24'') on the front side.
      10. Adequate floor drainage should be provided for the room in which the device is located to handle any overflow from the relief valve discharge or any spillage from testing or repairing of the device.
      11. The device must be adequately supported to prevent the device from sagging. Special supports are needed for four inch (4") to ten inch (10") units.
      12. The device shall be protected from freezing, vandalism, mechanical abuse and from any corrosive, sticky, greasy, abrasive, or other damaging environment.
      13. The test cocks, valve stems, or nameplate should not be painted and their accessibility, operation or legibility shall not be hampered nor the relief valve discharge passage be restricted by insulation or other coverings.
      14. The device shall be positioned where discharge from relief port will not create undesirable conditions. A rigidly secured, approved air-gap shall separate the relief port from any drainage system and be used to direct discharges away from the unit. The relief valve must never be plugged, restricted or solidly piped to a drain, ditch, or pump.
      15. It is recommended that an approved strainer, fitted with a test cock, be installed immediately upstream of the backflow device or shut-off valve. Strainers should never be installed on fire service lines.
      16. Reduced pressure backflow prevention assemblies shall not be installed in confined space areas (pits) as defined by OSHA regulations (29 CFR 19 10.146).
      17. The device shall be located in an area free from submergence or flood potential.
      18. When a reduced pressure backflow prevention assembly is installed, a closed system is created. Prior to installation, insure that the temperature/pressure-relief valves on heating vessels are properly installed and are in good working condition.
      19. Only devices approved by the Tennessee Department of Environment and Conservation may be used for protection against backflow hazards. All devices will be tested annually.
  2. Facilities required to have reduced pressure backflow preventers. The following type facilities will be equipped with reduced pressure backflow preventers in the service line before any branches. All devices shall be installed in accordance with the installation criteria supplied by Jefferson City Water Supply. Any variations of these guidelines must have prior approval from Jefferson City Water Supply. All testing of the backflow devices will be made by Jefferson City Water Supply personnel. Test will be made at the time of installation, at the time of any repairing or relocation, and at the completion of each year of service.
     
     
    1. Agricultural processing facilities;
    2. Aircraft storage and maintenance facilities;
    3. Automotive and automotive related facilities;
    4. Autopsy facilities;
    5. Barber shops;
    6. Beauty schools and colleges;
    7. Beauty shops;
    8. Bottling plants;
    9. Car washes;
    10. Dental buildings;
    11. Distributors and users of fertilizers, pesticides and herbicides;
    12. Dry cleaners;
    13. Facilities with auxiliary water sources;
    14. Facilities with water using equipment;
    15. Film processing facilities;
    16. Food and beverage processing;
    17. Funeral homes and mortuaries;
    18. Green houses and nurseries;
    19. Health club facilities;
    20. Hospitals (human and animal);
    21. Hotels and motels;
    22. Industrial facilities;
    23. Laboratories;
    24. Laundries;
    25. Machine shops;
    26. Manufacturing plants;
    27. Medical buildings;
    28. Morgues;
    29. Multi-story buildings, four (4) stories or higher;
    30. Nursing homes;
    31. Oil or gas production, storage or transmission facilities;
    32. Waste processing and transporting facilities;
    33. Printing company;
    34. Public swimming pools, ponds and fountains;
    35. Railroad terminal;
    36. Restaurants;
    37. Restricted establishments;
    38. Sand, gravel and concrete plants;
    39. Schools and colleges;
    40. Service stations;
    41. Sewage treatment, water treatment and pumping facilities;
    42. Shopping centers (occupancy unknown);
    43. Travel trailer park;
    44. Wastewater treatment plants and pumping facilities;
    45. Water treatment plants;
    46. Water using recreational facilities (pools, water slides, etc.);
    47. Irrigation systems.
  3. Double check valve and double check detector assemblies installation criteria.
     
     
    1. General. All backflow prevention devices will be inspected to verify that units meet the following requirements and tested to verify that the installed units meet the performance requirements as set forth in the 9th edition of the Manual for Cross-Connection Control published by the Foundation for Cross-Connection Control and Hydraulic Research - University of Southern California (FCCCHR, 1993) before they will be accepted by Jefferson City Water Supply. It is encouraged that a water system representative be asked to visit the site to review details of the proposed installation prior to work.
    2. Requirements.
      1. Specifications and detailed drawings shall be submitted to and approved by Jefferson City Water Supply prior to the installation of any device.
      2. All devices shall be installed pursuant to Jefferson City Municipal Code title 18, chapter 4 and the Tennessee Department of Environment and Conservation, Division of Drinking Water Supply, Cross-Connection Control Manual rules and regulations.
      3. All devices shall be installed in accordance with the manufacturer's installation instructions, and shall possess all test cocks and fittings required for testing the device. The University of Southern California and Jefferson City Water Supply specifications can supersede the manufacturer's installation instructions. All fittings shall permit direct connection to Jefferson City Water Supply test devices.

      4. Brass test fittings need to be installed in test cocks.

        Brass fittings required for backflow preventers.

        (These fittings should be installed with Teflon tape, not plumber's cement)

        Contact JCPW at 865-475-6617 when devices have been repaired or installed.

      5. The entire device, including test cocks and valves, shall be easily accessible for testing and repairs.
      6. The pipeline shall be thoroughly flushed to remove foreign material and debris before installing the device.
      7. The device shall be installed prior to any branching and/or fire connections (siamese).
      8. The device shall be located a minimum of twelve inches (12") above the floor surface or flood plain. Maximum height above the floor surface shall not exceed sixty inches (60").
      9. Clearance of device from wall surfaces or other obstructions shall be a minimum of six inches (6'') on the back side and a minimum of twenty-four inches (24") on the front side.
      10. Adequate floor drainage should be provided for the room in which the device is located to handle any spillage from testing or repairing of the device.
      11. The device must be adequately supported to prevent the device from sagging. Special supports are needed for four inch (4") to ten inch (10") units.
      12. The device shall be protected from freezing, vandalism, mechanical abuse and from any corrosive, sticky, greasy, abrasive, or other damaging environment.
      13. The test cocks, valve stems, or nameplate should not be painted and their accessibility, operation or legibility shall not be hampered nor the relief valve discharge passage be restricted by insulation or other coverings.
      14. The by-pass meter on the double check detector assembly shall be supplied and installed by the owner, meter to read in gallons. The by-pass line on the assembly shall include a double check valve and shall be fitted to accept a five-eighths inch by three-fourths inch (5/8" x 3/4") water meter with male couplings on both ends and a laying length of seven and one-half inches (7 1/2").
      15. It is recommended that an approved strainer, fitted with a test cock, be installed immediately upstream of the backflow device or shut-off valve. Strainers should never be installed on fire service lines.
      16. A gravity drainage system is required on all installations. On certain slopes, where below ground installations are installed, a single or multiple gravity drain system must be used.
      17. Jefferson City Water Supply has adopted the American Water Works Association classification scheme (Manual M-14) for backflow protection on fire prevention systems. This scheme classifies fire systems into six (6) classes based on water source and arrangement of supplies. The type of backflow protection necessary for the premises is determined by the classification of the fire system. Minimum acceptable backflow protection on tire systems in the City of Jefferson City is a double check detector assembly.
      18. When a double check valve assembly and double check detector assembly are installed, a closed system is created. Prior to installation, insure that the temperature/pressure-relief valves on heating vessels are properly installed and are in good working condition.
      19. Only devices approved by the Tennessee Department of Environment and Conservation may be used for protection against backflow hazards. All devices will be tested annually and test reports must be submitted within ten (10) days after testing to JCWD. (as added by Ord. #2010-01, March 2010)