OO-M-2888
3. REQUIREMENTS
3.1 Description. The concrete mixer consist basically of non-tilting steel mixing drum with an end discharge chute, water measuring tank, water pump, skip loader, engine drive, operating controls, and a towable wheeled steel frame.
3.2 First article. When specified (see 6.2), the contractor shall furnish a complete mixer for first article inspection and approval (see 4.2.1 and 6.3).
3.3 Standard commercial product. The mixer shall, as a minimum, be in accordance with the requirements of this specification and shall be the manufacturer's commercial product (see 6.4). Additional or better performance features which are not specifically prohibited by this specification but which are a part of the manufacturer's standard commercial product, shall be included in the mixer being furnished.
3.4 Safety. All rotating or reciprocating parts, and parts subject to high temperature, that are so located to be a hazard to operating personnel shall be insulated, enclosed, or guarded.
3.5 Materials. Materials used shall be free from defects which would adversely affect the performance or maintainability of individual components or of the overall assembly. Materials not specified herein shall be of the same quality used for the intended purpose in commercial practice. Unless otherwise specified herein, all equipment, material, and articles incorporated in the work covered by this specification are to be new and fabricated using materials produced from
recovered materials (see 6.4) to the maximum extent possible without jeopardizing the intended use. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification.
3.6 Maintainability. The mixer design shall permit ready accessibility to all items requiring periodic maintenance service in the field.
3.7 Interchangeability. All mixers of the same classification furnished with similar options under a specific contract shall be identical to the extent necessary to ensure interchangeability of component parts, assemblies, accessories, and spare parts.
3.8 Environmental condition. The mixer shall be capable of being stored, started, and perform normal operation at any ambient temperature between 32 and 125 degrees Fahrenheit (0 and 52 degrees Celsius).
3.9 Mixing drum. The mixing drum shall be fabricated from steel with sufficient thickness to provide an estimated service life of not less than 4,000 hours of continuous operation. The drum shall provide for easy replacements of mixing blades.
3.10 Water measuring tank. The water measuring tank capacities shall be not less than 18 and 26 gallons (68 and 98 liters) for size 11S and 16S respectively. The tank shall be equipped with controls which shall automatically discharge a measured amount of water into the charging side of
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