A-A-52030
shall be fabricated of materials fully compatible with the fuels to be dispensed to include all grades of gasoline and jet hydrocarbon fuels. Fuel wetted metallic surfaces shall avoid the use of copper, copper alloys or cadmium plating. Elastomeric seals and diaphragms shall not deteriorate during long term exposure to fuel and shall remain flexible under the environmental conditions applicable to type I, type II and me III nozzles.
Spout. The spout shall be style 1, nonflexible, curved type, or style 2, straight type, conforming to the contractor’s standard configuration and length, provided the end- to-end length of the spout is not less than 7.0 inches as measured along the centerline of the spout. The spout of the size 1 nozzle shall meet the release and breakaway requirements of UL 842. Gasoline-dispensing nozzles shall be for use with leaded or unleaded gasoline, as specified. The terminal end of the nozzle spout for use with leaded gasoline, class A, shall have an outside diameter of not less than 0.930 inches and a wall thickness of not less than 0.065 inches. The terminal end of the nozzle spout for use with unleaded gasoline class B, shall have an outside diameter of not more than 0.840 inches and a wall thickness of not less than 0.065 inches. The delivery end of the spout shall include a straight section not less than 2.50 inches in length. The retaining spring shall terminate 3.0 inches from the terminal end of the spout.
Wire, spiral, antislip. The type II, size 1 nozzle shall be equipped with a zinc-plated spring steel wire, spirally wound around the spout and secured to the nozzle. The size and length of the spiral wound wire shall be in accordance with the wire supplied on the manufacturer’s standard nozzle spout.
Check valve. Unless otherwise specified, a check valve shall not be required. When check valves are required, they shall be compatible with the applicable type, size, class, and style of nozzles and shall be in accordance with the manufacturer’ s standard check valve.
Accessories. The size 1 nozzle shall be furnished with an external nominal 1.0- inch x 0.75- inch NPT reducing bushing or external nominal 0.75- inch x 1.0- inch NPT step-up bushing with the internal nominal 0.75-inch NPT inlet. The size 2 nozzle shall be furnished with an external nominal 1.50- inch x 1.250- inch NPT reducing bushing. The size 3 nozzle shall be furnished with an external nominal 2.0-inch x 1.50-inch NPT reducing bushing. Unless otherwise specified, an aluminum dust cap shall be attached to the nozzle by a chain and a spring. The chain shall be size no. B sash chain. The chain shall be tensioned by a 3-pound per inch, plus or minus l-pound per inch, compression spring. When specified, each nozzle shall be equipped with a fuel nozzle-to-aircraft cable jumper conforming to MS25384-1. Unless otherwise specified, the cable shall be 6.50 feet long. The spout tube of the size 2 and size 3 nozzles shall be equipped with a wire-cloth strainer. The wire cloth shall be 100 x 100 mesh (open area 30.3 percent), made from 0.0045-inch
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