necessary. Combustion control system shall be capable of
maintaining the plant steam pressure at the main header within the
tolerance limits of plus or minus [_____] percent expressed as a
percent of the set point values. The specified tolerance shall
apply to a load which, within a one-minute period, swings from a
steady-state condition to an increase (or decrease) in load equal
to a maximum of 10 percent of the plant. Regulation tolerances
shall apply to any steady state condition within the plant
turndown ratio of [_____]. Combustion efficiency shall not be
less than that specified in the boiler specifications.
e.
Pressure gage conforming to ASME B40.1 or indicating steam
pressure in main steam header, [for indicating atomizing steam
pressure,] and for indicating feedwater pressure.
2.1.4
Boiler Control and Instrument Cabinet(s)
Provide boiler control and instrument cabinet(s) as specified in the
referenced boiler specification(s) and may be mounted either on the boiler
front or adjacent thereto. The arrangement may consist of a boiler mounted
cabinet containing controls normally provided by the manufacturer and a
supplementary cabinet containing additional controls and instruments
required herein. Mount [plant master combustion control] [and] [steam flow
recorder] on or adjacent to control panel for number [_____] boiler.
2.1.5
Free-Standing Multi-Boiler Plant Control and Instrument Panel
Provide a free-standing panel and locate as indicated. The panel shall
contain all individual and multi-boiler controls, monitoring system, and
panel-mounted instruments specified herein and in the reference
specifications, except that flame safeguard system may remain separately
mounted in a cabinet at each boiler.
[2.1.5.1
Control Panel Construction
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NOTE: Select the applicable paragraph(s) from the
following:
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NOTE: Delete inapplicable paragraph(s).
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Construct control panel of not less than 3 mm 11 gage reinforced steel for
face, top, and sides. The enclosed panel shall be not less than 610 mm 24
inches in depth with inside rigidly welded braces. Design control panel so
that all indicating and recording devices and manually operated switches
shall be flush mounted in a gasketed removable-top front panel with
indicating and recording devices at eye-level. Provide a similar
removable-top rear panel located opposite front panel to facilitate wiring,
piping, and maintenance. Install other operating controls on a sub-panel
within the enclosure. Access to panel enclosure shall be through gasketed,
double piano-hinged doors of not less than 1.52 mm 16 gage steel. The
doors shall be reinforced to prevent sagging and shall be provided with a
three point compression type fastener and polished key lock handle.
Include a full width fluorescent lighting canopy also. Prime coat complete
control panel and lighting canopy and finished in baked enamel. Identify
flush-mounted devices on panel with engraved lamicore nameplates.
SECTION 15516N
Page 14
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