(2)
Burner gas supply pressure (0 to 172 kPa (gage) 25 psig)
b.
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 connection(s) to oil burner. Provide low oil pressure and
low atomizing air pressure switches, and other safety interlocks
and devices as required. Provide in panel mounted on burner
package the following gages. Gages shall be 150 mm 6 inch with
white coated dials and black figures:
(1)
Fuel oil supply pressure (0 to 1034 kpa (gage) 150 psig)
(2)
Fuel oil pressure at burner (0 to 1034 kPa (gage) 150 psig)
[(3) Atomizing air pressure at burner (0 to 1034 kPa (gage) 150
psig)]
[(4) Atomizing steam pressure at burner (0 to 1034 kPa (gage) 150
psig)]
c.
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.
[(1) Control Type: The flame safeguard system shall be of the
automatically sequenced type with complete 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.]
(2) Scanner and Relay: Provide system with ultraviolet [and
infrared] scanner[s] and electronic relay located in the front
wall which will shut down the fuel within 2 to 4 seconds of loss
of flame.
(3) Output Meter: Provide scanner output meter in panel for
indication of scanner signal strength.
(4) Limit Devices: The safety system shall include the following
limit devices incorporated into a limit circuit:
(a)
Flame failure
(b)
High boiler outlet pressure
(c)
Low fuel oil pressure
(d)
Low natural gas pressure
(e)
High natural gas pressure
(f)
Low water level cutout
(g)
Low combustion air flow
(h)
Low atomizing [air] [steam] pressure
SECTION 15511N
Page 37
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