There are different devices and plumbing configurations that can be used to prevent backflow. A consultation with Backflow Solutions, Inc. (BSI) or the administrative authority (call 319-286-5922 or 319-521-5870) should help you decide which device is appropriate for your use.
| Device | Typical Applications |
| Air Gap | Swimming pools, sewage treatment plants, some industrial processes are not practical |
| Pressure Vacuum Breaker | Some utility sink applications |
| Double Check Assembly | Some fire sprinkler systems, some commercial properties |
| Reduced Pressure Principal Assembly | Irrigation systems, boilers, booster pumps, industrial plants, hospitals, morgues, chemical plants, some fire sprinkler systems |
Basic Installation Requirements:
Chapter 12.33 outlines some basic installation requirements for backflow prevention devices, summarized here. For a complete understanding of the requirement, please consult the ordinance and/or a certified plumber.
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Install the device immediately following the meter in horizontal plumbing for containment and on the water inlet pipe before it enters equipment for isolation.
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Protect all backflow prevention devices from freezing.
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If hot water is used, thermal expansion must be provided.
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Do not install the backflow prevention device where it might create a safety hazard, such as over an electrical panel or above the ceiling.
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If you need to maintain continuous water service while testing or repairing a backflow prevention device, an additional backflow prevention device must be installed on the temporary line.
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All backflow prevention devices must be accessible for testing.
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All shut-off valves must conform to specified requirements in the current edition of the USC Manual of Cross-Connection Control.
Additional Requirements for Reduced-Pressure Principle Backflow Devices:
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Protect the device from flooding.
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Do not install in underground vaults or pits.
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Must be able to drain the discharge of water from the device to a suitable drain.
More Information about Backflow Prevention Devices
Backflow Solutions, Inc. (BSI) Office Contact Information
BSI Support Contact information for Water Customers:
Phone: 888-966-6050
Email: support@backflow.com
BSI Support Contact information for Testing Companies:
Phone: 800-414-4990
Email: bsionline@backflow.com
