b.
Flame Safeguard: Verify operation of flame safeguard controls by
simulated flame and ignition failures. Verify the trial-for-pilot
ignition, trial-for-main flame ignition, combustion control
reaction and valve closing times by stop watch.
c.
Immunity to Hot Refractory: Operate burner at high fire until
combustion chamber refractory reaches maximum temperature. Main
fuel valve shall then be closed manually. Combustion safeguard
shall drop out immediately causing safety shutoff valves to close
within the specified control reaction and valve closing times.
[d.
Pilot Intensity Required: Gradually reduce fuel supply to the
pilot flame to the point where 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. When
the main fuel valve can be opened on a pilot flame of insufficient
intensity to safely light the main flame, the boiler shall be
rejected.]
e.
Boiler Limit and Fuel Safety Interlocks: Safety shutdown shall be
caused by simulating interlock actuating conditions for each
boiler limit and fuel safety interlock. Safety shutdowns shall
occur in the specified manner.
f.
Combustion Controls: Demonstrate 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. Control accuracy shall be as
specified.
g.
Safety Valves: High pressure limit switch shall be locked out or
otherwise made inoperative and the boiler safety valves shall be
lifted by steam. Determine the relieving capacity, popping
pressure, blowdown and reseating pressure by observation and
measurement in accordance with the ASME BPVC SEC I. The ASME
standard symbol will be accepted only as indicating compliance
with the design and material requirements of the code.
3.2.5.8
Auxiliary Equipment and Accessory Tests
Observe and test blowdown valves, stop valves, try cocks, fans, fuel oil
heaters, pumps, electric motors, and other accessories and appurtenant
equipment during operational and capacity tests for leakage, malfunctions,
defects, and for compliance with referenced standards.
3.2.5.9
Feedwater Equipment Tests
Perform tests of feedwater treatment equipment in two steps. Conduct one
test concurrently with the combustion tests. The Government will perform a
second test during the first period of heavy loading after plant has been
accepted and put in service. Correct deficiencies revealed during the
Government tests under the guarantee provisions of the contract. Both the
first and second series of tests shall determine compliance with limits for
chemical concentrations of this specification. Supply equipment for taking
samples and test kit for analyzing samples. Sampling equipment and test
kit shall become the property of the Government when tests are completed.
SECTION 15511N
Page 91
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