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Subject 40-23-2 ANTI-SYPHON DEVICE

Rule 40-23-2-.01 Anti-Syphon Device

Any irrigation system designed or used for the application of fertilizers, pesticides, or chemicals, shall be equipped with an anti-syphon device consisting of the following components:

(a) Functional Check Valve. Such valve shall be equipped with replaceable disc and shall be serviceable with conventional tools. This valve shall be located in the irrigation supply line between the irrigation pump and the point of injection of fertilizer, pesticide or chemical. This valve, when installed, shall be on a horizontal plane and level.
(b) Low Pressure Drain. Such drain shall be at least three-fourths inch in diameter. It shall be located on the bottom of the horizontal pipe between the functional check valve and the irrigation pump. It must be level and must not extend beyond the inside surface of the bottom of the pipe. The outside opening of the drain shall be at least two (2) inches above grade.
(c) Vacuum Relief Valve. The low pressure drain shall include a vacuum relief valve as a component part, or shall be complemented with a separate vacuum relief valve. The separate vacuum relief valve shall be at least three fourths inch in diameter and shall be located at the top of the same horizontal pipe section in which the low-pressure drain is located.
(d) Neither the low-pressure drain nor the vacuum relief valve shall be altered in any manner, including the installation of a gate valve or other device, which would render the anti-syphon system inoperative or ineffective or permit it to be made inoperative or ineffective.

Rule 40-23-2-.02 Maintenance

All check valves, low pressure drains and vacuum relief valves shall be maintained free of corrosion or other build-up and operative at all times during operation of the system.

Rule 40-23-2-.03 Placement of Components

All required functional check valves, low pressure drains and vacuum relief valves shall be placed within the irrigation system consistent with Diagram 1*, which is attached hereto and made a part of this rule.

*Diagram 1 appears on page 821.

DIAGRAM 1 INSTALLATION OF ANTI-SYPHON

DEVICE IN IRRIGATION SYSTEM


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