A-A-52558A
the various forms of corrosion and deterioration. Dissimilar metals shall not be used in intimate contact with each other unless protected against galvanic corrosion. Recovered materials shall be used to the maximum extent practicable. Materials not specified shall be selected by the contractor and shall be subject to all provisions of this CID. Asbestos, cadmium, and radioactive material will not be used in this item. Radioactive material is defined by Title 10, Code of Federal Regulations, Part 40, and other radioactive material in which the radioactivity is greater than 0.002 microcuries per gram or 0.01 microcuries total activity for the item.
3.3 Performance. The force of blow of the breaker shall be not less than 9 foot-pounds (ft-lb) (12.20 Newton-meters (N-m)) per blow under vertical operating conditions with no extra force applied on top of the breaker. The piston speed at no load shall be not less than 1800 blows per minute. The breaker shall break a 2 in. (51 mm) or thicker slab of Portland cement concrete. The breaker using the spade in cohesive soil shall operate in all positions from the vertical to the horizontal. The breaker shall accomplish the tasks without evidence of mechanical failure, malfunction, permanent deformation, breakage of any part or component, evidence of wearing of the piston diameter or cylinder diameter of more than 0.001 in. (0.0254 mm), absence of oil vapor in the exhaust air and failure to break the slab of Portland cement concrete. Performance shall be unimpaired at any ambient temperature from -25 degrees Fahrenheit (°F) to 120 °F [-32 degrees Celsius (°C) to 49 °C].
3.4 Maintainability and reliability.
3.4.1 Maintenance support. Technical manuals, illustrating repair parts and recommended operation and scheduled maintenance, shall be furnished with each breaker. All repair parts having the same part number shall be functionally and dimensionally interchangeable.
3.5 Surfaces. All edges shall be rounded or chamfered, and all parts, components, and assemblies of the breaker including surfaces shall be clean, and free from sand, dirt, firs, pits, sprues, scale and other harmful or extraneous materials.
3.6 Noise limits. Noise levels shall not exceed 85 decibels [dB(A)] at operating positions during typical load operations. If it can be shown that 85 dB(A) is beyond the state of the art for this equipment, then a hearing protection warning decal shall be placed on the equipment stating that hearing protection is required within (specify) feet. The distance specified shall be the greatest distance at which 85 dB(A) is met. The decal shall be readable to all personnel exposed to the hazard. Warnings shall also be added to applicable manuals requiring hearing protection to be worn within the specified distance.
3.7 Backhead assembly. The backhead assembly shall include a housing, handle, throttle, and throttle valve. The handle for type I shall be D-grip and for type II shall be extension T-handle. The throttle for type I shall be positioned inside the D-grip. The throttle shall be located for operating from either side of the breaker by the operator. A self-closing lever type throttle shall be furnished.
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