plates of pit. Provide concrete railroad ties adjacent to each
thawing pit. Deliver combustion air to burners by means of
pressure blowers which take fresh air from outside thawing area.
Factory wire and assemble heaters, control panels, blowers, and
zone controls. Shop fabricate burner piping and control valve
assemblies.
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NOTE: Designer shall make selection here based on
fuel to be used in thawing system.
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b.
Fuel System: [Provide complete fuel system for operation with,
[natural] [liquified petroleum] gas including piping, regulators,
low and high pressure limit switches interlocked with combustion
controls, gages, solenoid valves, shutoff valves, and other
accessories which may be required for each manufacturer's
particular system.] [Provide complete fuel system for operation
with duplex fuel oil pump set with [_____] liters gallon
horizontal [below] [above] ground fuel tank and other accessories
which may be required for each manufacturer's particular system.
Provide fuel oil system in accordance with the requirements
specified under paragraph entitled "Fuel Oil System" this section.]
c.
Burner controls shall meet Industrial Risk Insurers' (I.R.I.,
formerly F.I.A.) requirements. Connect fuel system piping to fuel
supply piping as indicated. Burners shall be controlled
(modulate) to regulate heat output to suit the operating
requirements.
Provide a manual light-off, low pressure [gas]
[oil] pilot for automatic light-off of each thawing unit.
d.
Air System: Provide complete air systems for operation with
blowers, inlet silencers, gages, shutoff valves, low pressure
limit switches interlocked with combustion controls, and other
accessories which may be required for each manufacturer's
particular system.
e.
Control Panel: Provide centrally located control panel, with
panel front consisting of a graphic display of the thawing system.
Display shall be approximately to scale and coordinated with
control and light indication for combustion air blowers and on-off
control of convenient groups of heaters. Provide on-off control
with indicating light for each thawing pit. Panel shall have a
[NEMA 12] [NEMA 3R-8], dust-tight enclosure with internal
equipment and wiring accessible from the panel front. Provide
nameplates on panel front to designate function of switches and
indicating lights. Controls shall be suitable for [_____] volt,
[_____] phase, 60 Hz operation. Provide and mark terminals for
connections with the exception of the neutral. Terminal blocks
shall be 600 volt rated. Control relays shall have convertible
contacts and shall have rating suitable for intended services but
in any case, not less than 10 amp, 600 volt rating. Components
shall be oiltight type. Connections to panel shall be watertight.
Motor starters for combustion air blowers shall be installed in
each respective blower cabinet.
2.9.1.2
Surface Mounted Enclosed Railroad Hopper Car Thawing System
a.
Surface Mounted Enclosed Thawing Unit:
Burner shall be of
SECTION 15502N
Page 95
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