a wooden mallet until it touches the adjacent bricks. Mortar thick enough
to lay with a trowel shall not be permitted. Maximum mortar joint
thickness shall not exceed 3 mm 1/8 inch and average joint thickness shall
not exceed 1.6 mm 1/16 inch.
2.2.2.8
Plastic Refractory
Plastic refractory shall be installed in accordance with the manufacturer's
recommendation and by workmen skilled in its application.
2.2.3
Boiler Fittings and Appurtenances
HTW generator fittings and appurtenances suitable for a HTW working
pressure of [_____] Pa psig and [_____] degrees C degrees F shall be
installed with each HTW generator in accordance with ASME BPVC SEC I.
2.2.3.1
Thermometer
Thermometer for HTW generator inlet water and outlet water shall be
provided for each HTW generator in a visible location on the HTW generator.
2.2.3.2
Pressure Gauge
Pressure gauge shall be provided for each HTW generator in a visible
location on the HTW generator.
2.2.3.3
Relief Safety Valves
HTW generator relief safety valves shall be installed such that the
discharge shall be through piping extended to the plant blowoff tank.
Relief valves shall be sized, constructed, and their set pressures shall be
determined in accordance with ASME BPVC SEC I.
2.2.3.4
Drain Valves
Drain valves in tandem shall be provided at each drain point of blowdown as
recommended by the HTW generator manufacturer. Piping shall conform to the
requirements of ASME BPVC SEC I and shall be extra strong weight black
steel pipe conforming to ASTM A 53/A 53M. Drain valves shall conform to
ASME BPVC SEC I and shall be the balanced seatless type unless otherwise
approved.
2.2.4
Soot Blowers
When required, HTW generator shall be provided with soot blowers using
compressed air as the blowing medium. The soot blower system shall be the
automatic sequencing and intermittent puff type, and the soot blower
control unit shall be suitable for mounting on the generator control
panels. The soot blower units shall be rotated automatically in successive
steps by their controller, each step involving no more than a 69 kPa 10 psi
drop in air pressure at the receiver. After one unit is operated in
successive steps through its cycle, the controller shall shift the
operation to the second soot blower unit, and so on, until all units on
that generator have been operated, after which the controller shall be shut
down automatically by the sequence controls. The soot blower heads shall
have elements of suitable chrome alloy material for the temperatures
encountered in the HTW generator. The sequence timer shall have provision
for manual selection of the soot blower units to be used.
SECTION 15555A
Page 25
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