less than [_____] kW hp as specified under paragraph entitled "Motors and
Drives" in this section.
2.5.2
Flame Safeguard Controls
Provide a complete system of valves, interlocks and controls in accordance
with NFPA 8501 and as approved by Factory Mutual Engineering and Research.
2.5.2.1
Fuel Oil Train
Provide fuel oil train consisting of [steam] [air] atomizing oil gun,
auxiliary [steam] [air] atomizing oil gun for changing guns without a
shutdown, fuel oil control valve, two safety shutoff valves recirculation
valve, strainer, and flexible hose connections to oil burner package the
following gages. Gages shall be 150 mm 6 inch with white coated dials and
black figures:
a.
Fuel oil supply pressure (0 to 1034 kPa (gage) 150 psig)
b.
Fuel oil pressure at burner (0 to 1034 kPa (gage) 150 psig)
[c.
Atomizing air pressure at burner (0 to 1034 kPa (gage) 150 psig)]
[d.
Atomizing steam pressure at burner (0 to 1034 kPa (gage) 150 psig
)].
2.5.2.2
Control Sequencing
Flame safeguard system shall be designed to ensure safe purge, light-off
and shutdown procedures, and to monitor light-off, main flame and boiler
operating conditions.
a.
The flame safeguard system shall be of the automatically sequenced
type with programming timed and sequenced by a heavy duty,
industrial type timer. This timer shall be tamper-proof and shall
be designed so that advancement of the timer to shorten purge will
shut down the unit.
b.
Provide system with [ultraviolet] [infrared] scanner and
electronic relay located in the front wall which will shut down
the fuel within 2 to 4 seconds of loss of flame.
c.
Provide scanner output meter in panel for indication of scanner
signal strength.
d.
The safety system shall include the following limit devices
incorporated into a limit circuit:
(1)
Flame failure
(2)
High boiler outlet pressure
(3)
Low fuel oil pressure
(4)
Low water level cutout
(5)
Low combustion air flow
(6)
Low atomizing [air] [steam] pressure
SECTION 15502N
Page 73
Previous Page
