at least [8] [_____] hours and shall include the following:
3.2.4.1
Sequencing
The boiler shall start, operate, and stop in strict accordance with the
specified operating sequence.
3.2.4.2
Flame Safeguard
Verify the operation of the flame safeguard controls by simulated flame and
ignition failures. Test burners having intermittent pilots by simulating
main flame failure while the pilot is burning. Verify by stop watch the
trial-for-pilot ignition, trial-for-main flame ignition, combustion control
reaction, and valve closing times.
3.2.4.3
Immunity to Hot Refractory
Operate the burner at high fire until the combustion chamber refractory
reaches maximum temperature. Then manually close the main fuel valve. The
combustion safeguard shall drop out immediately causing the safety shutoff
valves to close within the specified control reaction and valve closing
times.
3.2.4.4
Pilot Intensity Required
Gradually reduce the fuel supply to the pilot flame to the point at which
the combustion safeguard begins to drop out (sense "no flame") but holds in
until the main fuel valve opens. At this point of reduced pilot fuel
supply, the pilot flame shall be capable of safely igniting the main
burner. If the main fuel valve can be opened on a pilot flame of
insufficient intensity to safely light the main flame, readjustment of fire
eye is required.
3.2.4.5
Immunity to Ignition Spark
Where ultra violet flame detectors are employed, the pilot and main burner
manual safety shut off valves shall be closed. The burner shall then be
operated through the trial for pilot ignition period. The flame safeguard
relay shall not respond to the presence of electric spark. If the flame
safeguard relay responds to the presence of electric spark, reject the
boiler.
3.2.4.6
Boiler Limit and Fuel Safety Interlocks
Safety shutdowns shall be caused by simulating interlock actuating
conditions for each boiler limit and fuel safety interlock. Safety
shutdowns shall occur in the specified manner.
3.2.4.7
Combustion Controls
Demonstrate the accuracy, range, and smoothness of operation of the
combustion controls by varying the steam demand through the entire firing
range required by the turndown ratio specified for the burner [and in case
of automatic recycling burners, by further varying the firing rate to
require "on-off" cycling]. Control accuracy shall be as specified
3.2.4.8
Safety Valves
The high-pressure limit switch shall be locked out or otherwise made
SECTION 15516N
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