A-A-2745A
3.3 Base Material. When a metal base is specified the metal shall be corrosion resistant, such as aluminum, brass, bronze, zinc, nickel-copper alloy, stainless steel or zinc or other protective coating on steel. When a plastic base is specified the material shall be acrylonitrile butadiene styrene (ABS), polystyrene, nylon, acrylic, polypropylene or acetyl.
3.4 Base Design. The base shall be constructed to provide a rigid, stable platform for the sprinkler head. The design shall be in accordance with paragraph 3.4.1 or 3.4.2 as specified.
3.4.1 Sled Base. The sled base shall be an “H” configuration with the sprinkler head located between the sled runners at the center of the sprinkler. The base shall be a flow-through design equipped with male and female hose connections to allow the sprinkler to be operated in series. A cap and gasket shall be provided to cap the male connection. The sled base shall be of sufficient length and width to provide a stable platform for the sprinkler head during operation. Additionally, the base shall be designed to allow the sprinkler to be pulled by the hose across level turf when in operation without upsetting.
3.4.2 Ring Base. The ring base shall be a circle, square or rectangular with rounded corners. The outer edge shall be molded plastic or die-cast metal to provide a rail, minimum width 5/8 inch (15.9 mm), to add strength and rigidity to the base. The base shall be a flow through design equipped with male and female hose connections to allow the sprinkler to be operated in series. A cap and gasket shall be provided to cap the male connection. The ring base shall of sufficient length and width to provide a stable platform for the sprinkler head during operation.
3.5 Type I, Impulse Head. The Type I sprinkler shall be furnished with a removable, metal impulse head. The impulse head shall be adjustable to throw water in a full or partial circular pattern. The head shall be equipped with an adjustable break-up device to regulate the radius of coverage. The break-up device shall be spring loaded to maintain its setting and shall be designed to be adjusted by hand, without tools. The base shall be metal or plastic in accordance with paragraph 3.3. The base configuration shall be in accordance with paragraph 3.4.1 or 3.4.2 at the option of the manufacturer.
3.6 Type II, Multiple T Head. The type II sprinkler shall be designed to spray water in a round or square pattern at the option of the manufacturer. The sprinkler shall have two metal arms with a spray nozzle at the end of each arm. The spray nozzles shall be adjustable from a fine mist to a full spray. The base may be a sled design in accordance with paragraph 3.4.1 or wheeled design made from plastic or metal in accordance with paragraph 3.3. Bases for Type II only may be provided in flow through or non-flow through configuration. The base shall be provided with a one piece strainer washer. The base shall be of sufficient length and width to provide stable platform for sprinkler head during the operation.
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