degrees F. Heater shall be provided with automatic temperature-control
valve, with strainer and three-valve by-pass in heated water supply line,
and with check valve and cutoff valve in return line. An additional
manhole located above the heater shall be provided for removal of the
heater as a unit.
2.22.3
Tank Accessories
Accessories shall comply with Section 13202 FUEL STORAGE SYSTEMS.
2.23
COAL HANDLING EQUIPMENT
2.23.1
Screw Conveyor
**************************************************************************
NOTE: Where motor starters for mechanical equipment
are provided in motor control centers, delete the
description of motor starters.
**************************************************************************
Screw conveyor for the lateral distribution of coal shall consist of steel
screw conveyor with capacity of not less than [_____] cubic meters/sec
cubic feet/hour when handling coal of the specified maximum lump size.
Maximum capacity of the conveyor shall be based on the screws carrying not
more than 30 percent of their cross section (except feeder conveyors), and
the maximum speed of conveyor shall be 60 rpm. Conveyor and housing shall
be assembled in sections. The sectional flights shall be mounted on steel
pipe and connected by coupling shafts. A feeder conveyor may be installed
to assume the proper distribution of the load. Both the feeder screw and
the extended screw shall have their flights mounted on the same pipe. The
conveyor shall be provided with sectional supporting hanger bearings of the
babbitted type. Conveyor length between bearings shall not exceed 3.6 m 12
feet. Trough ends shall be fabricated cast-iron type with feet and fitted
with babbitted bearings. The drive shall be at the discharge end of the
conveyor and shall consist of an electric gear motor and chain drive. The
chain drive from the motor to the reducer shall be enclosed in an oil-tight
casing. Thrust in either direction shall be absorbed by the thrust
bearings. The motor may be mounted on top of the trough. The trough
conveyor housing shall be not less than 4.8 mm 3/16 inch steel with a 1.897
mm (14 gauge) 14 gauge steel cover and shall be dust-proof. Discharge
spout and coal gate shall be furnished as indicated. An approved type of
supporting saddle shall be provided. Supports shall be spaced at not more
than 3 m 10 foot intervals. Motor enclosure shall be [totally enclosed,
nonventilated] [totally enclosed, fan-cooled type suitable for installation
in a Class II, Division 1, Group F hazardous location in conformance with
NFPA 70]. [Motor starter shall be [manual] [[magnetic] [across-the-line]
[reduced voltage start]] type with [weather-resistant] [dust-tight]
[explosion-proof] enclosure.] Dust controlling covers and inlet and
discharge enclosures shall be provided for each conveyor.
2.23.2
Belt Conveyor
**************************************************************************
NOTE: Where motor starters for mechanical equipment
are provided in motor control centers, delete the
description of motor starters.
**************************************************************************
Belt conveyor shall be of the trough type, as shown.
Maximum incline of
SECTION 15555A
Page 67
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