00-C-2804
and horizontal perpendicular braces shall be not less than 1.0 by 1.0 by 0.1825
inch steel angle.
3.7.2 Idlers. Troughing idlers shall have ball bearings or antifriction
bearings and be of the 20° or 35° three unit troughing design. Return rollers
shall all be of the ball or antifriction bearing design. Bearing design shall
prevent entry of dust, sand, or moisture.
3.7,3 Belt. The belt shall be fabricated of heavy-duty, two-ply rubber of
synthetic or rubberized material, and be capable of withstanding the specified
loads (see 3.6), for continuous operating conditions.
The receiving hopper shall be the manufacturer's
3.7.4 Recieving hopper.
standard, gravity feed type. The hopper shall be of steel construction with
rubber flashing to keep material centered on the tilt.
3.7.5 Hydraulic hoist system. The conveyor shall be equipped with a hand
operated hydraulic system capable of raising and lowering the conveyor
throughout the range specified in 3.6. Hydraulic rams shall be shielded to
prevent damage from falling particles or other environmental conditions. A
positive mechanical lock with a locking pin shall be provided to prevent the
conveyor frame from lowering.
3.7.6 Conveyor power. As specified in the contract (see 6.2), the conveyor
shall be powered by an internal combustion engine or electric motor as specified
or at the manufacturer's option. As specified in the contract (see 6.2), the
power shall be transmitted to the conveyer belt through a combination of counter
shafts, power take-off, V-belts, clutches, and gear reduction units, or through
hydraulic pumps and motors, as specified or at the manufacturer's option.
3.7.6.1 Engine. The engine shall be the manufacturer's standard commercial
engine. The power and speed rating of the engine shall be such that operation
of the conveyor, under any of the requirements and tests specified herein, will
not require horsepower (hp) in excess of the continuous hp rating of the engine
at the applicable governed speed.
3.7.6.1.1 Diesel engine. The diesel engine shall start within 5 minutes and
be ready for full load operation within 15 minutes. The commercial deisel
engine supplied shall meet all the performance requirements specified herein
using fuel conforming to VV-F-800, grade DF-2, or when specified (see 6.2), fuel
conforming to MIL-T-5624, grade JP-5.
3.7.6.1.2 Gasoline engine. The gasoline engine shall be an air or liquid
cooled, industrial type, of a commercial design that has been proven
satisfactory in extensive use, and for which repair parts are readily
obtainable.
3.7.6.1.3 Engine accessories. Both gasoline and diesel engines shall be
complete with the accessories normally furnished with the engine, with the
following as a minimum:
Electrical cranking system. Battery shall be not less than 12-volt
a.
(V)potential, lead acid, and negative ground. The voltage and
ampere-hour rating of the batteries shall be manufacturer's standard.
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