insulation and 102 mm 4 inches of heavy castable refractory conforming to
ASTM C 401, Class R. Doors shall be equipped with high temperature gaskets
and door latches.
2.2.17
Miscellaneous Pipe Connections
Miscellaneous pipe connections shall be provided for steam outlet, safety
valves, feedwater, feedwater regulator, water column, blowoff, steam supply
to soot blowers, steam gauge and vent, continuous blowdown, continuous
chemical feed, and instrument connections. Soot blowers shall be provided
if the combustion source utilizes solid fuel. A suitable smoke outlet with
steel frame, damper, and damper shaft shall be provided. Damper shall have
external high temperature roller or ball bearings at both ends of the
shaft, and shall have a suitable operating arm and rod.
2.2.18
Observation Ports
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NOTE: Requirements for observation ports and test
holes depend upon the specific project, including
competence and availability of operating and
maintenance personnel, type of fuel to be burned,
etc. The number and location of the test holes will
conform to the requirements of the regulatory
authority. In addition, test holes for monitoring
operating efficiency will be provided as shown.
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[One] [Two] observation port[s] 80 mm 3 inches in diameter shall be
provided on each access door and shall be no less than 2.657 mm 12 gauge
black steel or cast iron tube or duct with a heat resistant glass cover or
an angular steel frame and closure plate with handle for operation without
gloves or other protective devices. Tube or duct shall extend from the
exterior of the casing to not less than one-half the thickness of the
refractory opening and shall be gas-tight. Provision shall be made for air
purging of the port when solid fuels are used at the heat source.
2.2.19
Test Holes
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NOTE: Coordinate with paragraph Observation Ports.
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Test holes shall be provided as indicated and shall be fitted with standard
weight, 50 mm 2 inch diameter, black steel pipe. Sleeve shall extend from
the exterior of the casing to not less than one-half the thickness of the
refractory lining. Refractory opening shall be formed from the end of the
pipe sleeve to the interior wall surface to shield the end of the sleeve
from reflected heat. Sleeve shall be fitted with a brass screw cap and
security chain. Each test pipe shall have two or more sturdy lugs welded
in approximately the middle of its length to prevent the pipe from turning
when the cap is being removed.
2.2.20
Safety Devices
Boilers shall be provided with safety devices providing automatic overheat
shutdown and manual shutoff of the combustion equipment or flue gas dampers
to bypass the boiler.
SECTION 15846A
Page 27
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