quantity as to produce an undue percentage of excess air with high stack
loss. Oil burner shall operate without clogging and shall have sufficient
capacity to develop not less than the specified capacity. Burner unit
shall be easily removed from firing position and readily accessible for
inspection, cleaning and other purposes. Provide adequate observation
ports on burner. Burner manufacturer shall guarantee that there will be no
flame impingement on sidewalls, top, bottom, or rear walls of furnace.
Burner manufacturer shall furnish, and contractor shall install refractory
throat tiles or other items required for proper installation of burner.
2.5.1.2
Atomization
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NOTE: Burners may be air atomizing or steam
atomizing. When a separate compressed air system is
used the designer shall fill in blanks with the
quantity and pressure of compressed air that will be
available for fuel oil atomization. The designer
should allow for an adequate amount of atomizing
air. Atomizing air requirements will vary depending
on many factors including burner design, fuel oil
characteristics, fuel oil pressure, air pressure and
even furnace conditions. See NAVFAC Design Manual
DM-3.6 for empirical information.
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Burner shall be [steam atomizing; steam pressure at header is [_____] kPa
(gage) psig; steam temperature at header is [_____] degree C F] [air
atomizing; filtered compressed air shall be available for burner
atomization and the maximum requirement for each burner shall not exceed
[_____] L/s scfm of air at [_____] kPa (gage) psig]. Provide pressure
reducing valve and controls as required.
2.5.1.3
Electric Ignition System
Burner shall be equipped with an electric ignition system. System shall be
either the high energy ignition or glow rod type. Gas ignition system is
not acceptable. The high energy ignition system shall use stored energy to
develop 2000 Vdc pulses. The glow rod system shall use a low voltage,
carbon rod electrode which develops a tip temperature of 1427 degrees C
2600 degrees F. Provide ignition system complete in all respects.
2.5.1.4
Windbox
Construct of carbon steel plate not less than 10 gage thickness with 6 mm
1/4 inch thick front plate. Design windbox to provide even and uniform air
entrance into the burner register and seal weld to the boiler front wall.
Provide windbox with support legs.
2.5.1.5
Purge Connection
Provide [steam] [air] purge connection, properly valved, for purging oil
from gun prior to removal from burner.
2.5.1.6
Aspirating System
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NOTE: Provide aspirating system only for boilers in
which the expected furnace pressure exceeds 1245 Pa
SECTION 15502N
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