00-C-2868
show the applicable power supply requirements for the plant, in bold type, as
follows:
POWER SUPPLY REQUIRED
Diesel engine-driven generator set. When specified (see 6.2), a
3.7.9.3
diesel engine generator set shall be furnished. The generator set shall comply
with CC-G-2745, and shall have 60 Hz, 460 V current generation. The rated power
output of the generator set shall be adequate for the total maximum connected
load, including start-up, of the concrete plant and auxiliary electrical
equipment, plus 5 percent additional load for area lighting for night
operations. The diesel engine shall start at any temperature from -20 to +120 °F
(-29 to +49 °C) and shall include an hour meter. Starting aids shall be either
a electric glow plug or ether primer. When an ether primer system is provided,
it shall be of the measured shot type with storage capacity of not less than 12
fluid ounces (.35 liters). The generator set shall be provided with a
weatherproof housing. The housing shall protect the generator set for both
storage and operation in all weather conditions. Unless otherwise specified
(see 6.2), the battery furnished with the diesel engine shall be dry charged in
accordance with W-B-131, without electrolyte, with sealed caps to prevent the
intrusion of atmospheric moisture.
3.7.10 Scales. Scales shall be of the level balance, springless or load
cell type. The aggregate scale shall be of the accumulative three-material
type, capable of automatically weighing preset amounts of the three materials.
The cement scale shall be one material type, capable of weighing a preset
amount of cement. Scales shall be equipped with zero interlocks to prevent
charging of a new batch, or the next material of the batch, or discharging of
the batch until the preset weights are reached and within the tolerances as
specified herein.
3.7.11 Control panel and controls. The concrete plant shall be furnished
with a dust and weather tight control panel with key-locked door(s) or cover(s).
The control panel, or console, shall contain all the necessary controls to
enable automatic, as defined by the CPMB, and manual operation of the plant by
one operator at the control panel. Automatic batching, mixer(s) charging, water
introduction, and mixing time cycle controls shall be provided with manual
over-ride controls. The mixer shall be discharged by activation of discharge
control at the control panel or at the mixer. An emergency stop control shall
be provided to enable complete shutdown. The control panel shall be provided
with preset type controls to control the amount of three sizes of aggregate,
cement, water, and mixing time per batch of concrete. A digital type batch
counter and a water readout (gallons or liters) per batch shall be provided.
3.7.12 Semitrailer units. The concrete plant (and mixer when furnished)
shall be separated into two semitrailer units for transportation. The
semitrailer units shall be designed to withstand shock loads incumbent with
performance requirements specified herein. Each semitrailer unit shall be
equipped with full air service brakes controlled from the. towing vehicle.
Service brakes, lighting, reflectors, and associated equipment shall conform
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