(1) An approved backflow prevention assembly shall be installed in a manner that:
(a) Facilitates its propery operation, maintenance, inspection, and in-line testing using standard installation procedures approved by the Department, such as, but not limited to, University of Southern California, Manual of Cross-Connection Control, 9th Edition, the Pacific Northwest Section American Water Works Association, Cross Connection Control Manual, 6th Edition, or the local administrative authority having jurisdiction;
(b) Precludes the possibility of continuous submersion of an approved backflow prevention assembly, and precludes the possibility of any prevention assembly; and
(c) Maintains compliance with all applicable safety regulations and the Oregon Plumbing Specialty Code.
(2) For premise isolation installation;
(a) The approved backflow prevention assembly shall be installed at a location adjacent to the service connection or point of delivery; or
(b) Any alternate location must be with the advance approval of the water supplier and must meet the water supplier's cross connection control requirements; and
(c) The premise owner shall ensure no cross connections exist between the point of delivery from the public water system and the approved backflow prevention assembly.
(3) Bypass piping installed around any approved backflow prevention assembly must be equipped with an approved backflow prevention assembly to:
(a) Afford at least the same level of protection as the approved backflow prevention assembly being bypassed; and
(b) Comply with all requirements of these rules.
(4) All Oregon Plumbing Specialty Code approved residential multi-purpose fire suppression systems constructed of potable water piping and materials do not require a backflow prevention assembly.
(5) Stand-along fire suppression systems shall be protected commensurate with the degree of hazard, as defined in Exhibit 2 (Backflow Prevention Methods).
(6) Stand-alone irrigation systems shall be protected commensurate with the degree of hazard, as defined in Exhibit 2 (Backflow Prevention Methods).
(7) An Atmospheric Vacuum Breaker (AVB) shall:
(a) Have absolutely no means of shut-off on the downstream or discharge side of the atmospheric vacuum breaker;
(b) Not be installed in dusty or corrosive atmospheres;
(c) Not be installed where subject to flooding;
(d) Be installed a minimum of 6 inches above the highest downstream piping and outlets;
(e) Be used intermittently;
(f) Have product and material approval under the Oregon Plumbing Specialty Code for non-testable devices,
(g) Not be pressurized for more than 12 hours in any 24-hour period; and
(h) Be used to protect against backsiphonage only, not backpressure.
(8) A Pressure Vacuum Breaker Backsiphonage Prevention Assembly (PVB) or Spill-Resistant Pressure Vacuum Breaker Backsiphonage Prevention Assembly (SVB) shall:
(a) Be installed where occasional water discharge from the assembly caused by pressure fluctuations will not be objectionable;
(b) Have adequate spacing available for maintenance and testing;
(c) Not be subject to flooding;
(d) Be installed a minimum of 12 inches above the highest downstream piping and outlets;
(e) Have absolutely no means of imposing backpressure by a pump or other means. The downstream side of the pressure vacuum breaker backsiphonage prevention assembly or spill-resistant pressure vacuum breaker backsiphonage prevention assembly may be maintained under pressure by a valve; and
(f) Be used to protect against backsiphonage only, not backpressure.
(9) A Double Check Valve Backflow Prevention Assembly (DC) or Double Check Detector Backflow Prevention Assembly (DCDA):
(a) Shall conform to bottom and side clearances when the assembly is installed inside a building;
(b) May be installed vertically as well as horizontally provided the assembly is specifically listed for that orientation in the Department's Approved Backflow Prevention Assembly List,
(c) May be installed below grade in a vault, provided that water-tight fitted plugs or caps are installed in the test cocks, and the assembly shall not be subject to continuous immersion;
(d) Shall not be installed at a height greater than 5 feet unless there is a permanently installed platform meeting Oregon Occupational Safety and Health Administration (OR-OSHA) standards to facilitate servicing the assembly;
(e) May be installed with reduced clearances if the pipes are 2 inches in diameter or smaller, provided that they are accessible for testing and repairing, and approved by the appropriate local administrative authority having jurisdiction;
(f) Shall have adequate drainage provided except that the drain shall not be directly connected to a sanitary or storm water drain. Installers shall check with the water supplier and appropriate local administrative authority having jurisdiction for additional requirements;
(g) Shall be protected from freezing when necessary; and
(h) Be used to protect against non-health hazards under backsiphonage and backpressure conditions.
(10) A Reduced Pressure Principle Backflow Prevention Assembly (RP) or Reduced Pressure Principle-Detector Backflow Prevention Assembly (RPDA):
(a) Shall conform to bottom and side clearances when the assembly is installed inside a building. Access doors may be provided on the side of an above-ground vault;
(b) Shall always be installed horizontally, never vertically, unless they are specifically approved for vertical installation;
(c) Shall always be installed above the 100-year (1%) flood level unless approved by the appropriate local administrative authority having jurisdiction;
(d) Shall never have extended or plugged relief valves;
(e) Shall be protected from freezing when necessary;
(f) Shall be provided with an approved air gap drain;
(g) Shall not be installed in an enclosed vault or box unless a bore-sighted drain to daylight is provided;
(h) May be installed with reduced clearances if the pipes are 2 inches in diameter or smaller, are accessible for testing and repairing, and approved by the appropriate local administrative authority having jurisdiction;
(i) Shall not be installed at a height greater than 5 feet unless there is a permanently installed platform meeting Oregon Occupational Safety and Health Administration (OR-OSHA) standards to facilitate servicing the assembly; and
(j) Be used to protect against a non-health hazard or health hazard for backsiphonage or backpressure conditions.
Statutory Authority: O.R.S. 431 & O.R.S. 448
Stats. Implemented: O.R.S. 431.110, O.R.S. 431.150, O.R.S. 448.131, O.R.S. 448.150, O.R.S. 448.268 & O.R.S. 448.273
(Ord. 2007-11-04, passed 11-13-2007)