MIL-HDBK-1130
possible, the interior of headers should be cleaned and
rustproofed. Welded-joint type superheaters should be washed
as a unit and dried by portable heating equipment. Ball ends
and seats should be protected by a coat of grease and
protective wrapping; element seats in headers should be greased
and plugged; yokes, studs, and nuts should be greased.
Economizers. Economizers should be cleaned and dried, as
c)
indicated for welded-joint type superheaters. Handholes,
ballpoints, and other parts should be treated to inhibit
corrosion.
d) Air Heaters. Deposits on the gas side of air heaters should be
removed carefully. Tubular and regenerative types should be
cleaned thoroughly by lancing or by washing with an alkaline
solution followed by clean water. Tubular heaters may require
turbining or wire brushing. If excessive deposits on tubular
and regenerative heaters will cause serious corrosion, the
heating surfaces should be removed. Air heater inlets should
be closed, if possible, to prevent circulation of air; dampers
should be tightly closed. Tube ends of tubular air heaters
should be plugged with wood plugs.
e)
Fans, Ducts, and Dampers. Ball and roller bearings of fans,
couplings should be greased. All deposits should be removed,
and all exposed surfaces should be painted. Dampers should be
closed to prevent air circulation. When necessary, wood
barricades should be built into the ducts.
f) Valves. Bonnets should be removed from valves. Finished
surfaces should be greased or otherwise treated to inhibit
corrosion. Valves should be reassembled after treatment.
g) Water Columns and Gauges. Water columns and gauges not removed
should be treated to inhibit corrosion; alarm-type water
columns should be opened. Knife edges, valve parts, and other
parts subject to corrosion should be coated with grease or
another rust-preventive compound.
h) Soot Blowers. All soot should be removed from blowers. Valve
parts, gears, and other contact surfaces should be greased.
Soot and Ash Hoppers. Soot and ash hoppers should be cleaned
i)
thoroughly and exposed surfaces painted. Discharge outlets
should be sealed with dry building sand.
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