[_____] kW hp motor operators, hand operated drain valve, with drilled
orifice and disc to prevent tight shutoff, element supports, clamps, bolts,
and other such items. Furnish necessary piping and valves including
drainlines, shut-off valves, piping supports and insulation.
Weld soot
blower piping and fittings. No screwed piping or fittings will be
permitted. Blower elements shall be carefully installed to avoid rubbing
on tubes which would cause eventual tube failure. Scavenging air
connections from forced draft fan shall be provided where required to
protect blowers in non-blowing position. Provide a single control station
containing start and stop pushbuttons and necessary relays to control the
motor operators.
2.2.8.2
Fixed Position Sootblowers (Air Puff)
Sootblowers shall be air puff type, fixed position, multi-nozzled rotating
element type complete with air master controller for each boiler, entirely
air-operated and designed for controlled automatic sequential operation.
Units shall be operated in such a manner that air issues from the element
in a series of sustained high pressure puffs of approximately one second
duration each. During each puff, the element shall be rotated through a
predetermined and measured short arc (17 1/2 degrees) by means of a ratchet
mechanism in the sootblower head. Between each puff, no air shall flow
through the blowers and there shall be sufficient time for the system to be
restored to full pressure. When the blowing cycle has been completed, the
controller shall automatically stop the sequence. Provide sootblowers
complete with wall sleeve bushings, element supports, clamps bolts and
other required components. Provide necessary piping and valves, including
shutoff valves, piping and supports. Weld sootblower piping and fittings.
No screwed piping or fittings will be permitted. Carefully install
blower elements to avoid rubbing on tubes which would cause eventual tube
failure.
2.2.8.3
Retractable Sootblowers
Provide in lieu of fixed position type and where flue gas temperatures
exceed 982 degrees C 1800 degrees F. Sootblowers shall be [air] [electric]
motor operated. Rotation of the blower shall be continuous from the moment
the lance begins to extend. Rotating and traversing speeds shall be
independently adjustable by changing sprockets. Blowers shall be complete
with heavy steel housing, outside adjustment of nozzle pressure, alloy
lance, wall sleeve, supports, and other necessary appurtenances required
for a completely workable system.
2.2.8.4
Elements
Equip units with elements specially designed for use with [steam] [air].
Elements subjected to temperatures of 482 to 816 degrees C 900 to 1500
degrees F shall be chromium covered extra heavy carbon steel tubing or a
chrome alloy as specified for a higher temperature; between 817 to 927
degrees C 1501 to 1700 degrees F, they shall contain not less than 20 to 23
percent chrome; from 928 to 982 degrees C 1701 to 1800 degrees F, not less
than 24 to 27 percent chrome. Provide a flexible connection between each
head and element.
2.2.8.5
Control
On the operating floor provide a pushbutton for each boiler for starting
and stopping system.
SECTION 15502N
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