Laserfiche WebLink
approved backflow preventer will be installed on the service <br />backflow line. Whenever continuous service is ~imperative, a <br />pair of backflow preventers may be installed in parallel. <br /> <br />Section 38-S7.12. Tanks and vats. <br /> <br /> W~ere a potable water outlet terminates below the flood <br />level rim of a tank or vat and the tank or vat has an overflow <br />diameter not less than given in the table below, the overflow <br />pipe shall be provided'with an air gap as close to the tank as <br />practicable. Overflow pipes for water supply tanks shall be <br />of the sizes set forth in the following table: <br /> <br /> 'SIZES'OF OVERFLOW PIPES FOR WATER EUPPLY TANKS <br /> <br /> Maximum capacity of water DiameTer of over- <br /> supply, line ........ to tank flow pipe (inches <br /> ID) <br /> <br />0-50 gpm 2 <br />50-150 gpm 2 1/2 <br />100-200 gpm 3 <br />200-400 gpm 4 <br />400-700 gpm 5 <br />700-1000 gpm 6 <br />1000 gpm 8 <br /> <br /> The potable water outlet to the tank or vat shall terminate <br /> .a distance not less than one and one-half times the height to <br /> which water can rise in the tank above the top of the overflow. <br /> <br /> Section 38-67.13. Protective devices for backpressure <br /> - and backsiphonage. <br /> <br /> Devices to protect against backpressure and backsiphonage <br /> sh~l be installed at all fixtures and equipment where backflow <br /> may occur and where a' minimum air gap cannot be provided between <br /> the-water outlet to the fixture or equipment and its flood-level <br /> rim. <br /> <br /> ~(a} 'Connections not subject to backpressure: a vacuum, break <br /> er shqll be installed on the discharge side'of the last valve on <br />-the line serving'the::fixture or equipment° <br /> <br />10 <br /> <br /> <br />