shall be provided for cleaning, inspection, and repair of all areas in the
complete assembly. Doors shall be gas-tight, and interior surfaces exposed
to direct radiation and high temperature shall be lined with approved
refractory material to prevent excessive heat losses and warping of doors.
Doors too large or bulky for hand removal shall be hinged. At least one
observation port with cast-iron cover shall be provided on the front and
rear wall of the furnace.
2.2.1.7
Miscellaneous
Pipe connections shall be provided for water inlet and drain outlet, drain
valves, relief valves, blowoff, air supply to soot blowers, gauge and vent,
chemical feed, and instruments. HTW generators shall be provided with
necessary jets for furnace turbulence, the number and arrangement of which
shall be as recommended by the HTW generator manufacturer. Soot blowers
shall be provided, if required by the manufacturer. A suitable smoke
outlet with steel frame, damper, and damper shaft shall be provided.
Damper shall have high temperature roller or ball bearings at both ends of
the shaft and shall have a suitable operating arm and rod.
2.2.2
HTW Generator Setting Materials
Materials shall conform to the following:
a.
Firebrick: ASTM C 27, class shall be as recommended by the HTW
generator manufacturer.
b.
Insulating Brick:
ASTM C 155, Class A.
c.
Castable Refractory: ASTM C 401. The minimum modulus of rupture
for transverse strength shall not be less than 4137 kPa 600 psi
after being heat-soaked for 5 hours or more at a temperature in
excess of 1370 degrees C 2500 degrees F.
d.
Mortar, Air-Setting, Refractory:
As recommended by the HTW
generator manufacturer.
e.
Brick, Common:
ASTM C 62.
f.
Tile, Load-Bearing, Hollow:
ASTM C 34, Grade LBX.
g.
Iron and Steel Sheets: Galvanized, ASTM A 653/A 653M; gauge
numbers specified refer to United States Standard gauge.
Uncoated, black: ASTM A 568/A 568M, or ASTM A 36/A 36M.
2.2.2.1
HTW Generator Casing
**************************************************************************
NOTE: On water tube type HTW generators that will
be used intermittently, welded wall construction is
recommended to minimize corrosion. In other
applications, or with fuels containing not more than
0.5 percent sulfur, a casing type enclosure is
suitable.
**************************************************************************
[HTW generator walls shall be steel-encased wall construction with
fabrication details as recommended by the HTW generator manufacturer. HTW
generator wall and roof lining shall consist of a continuous screen of
SECTION 15555A
Page 22
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