CHAPTER
7
For information regarding the Total Protection
Plan,
contact
your
Cleaver-Brooks
local
authorized representative.
B.
FIRESIDE
CLEANING
Soot and non-combustibles are effective
in·
sulators and
if
allowed to accumulate will reduce
heat transfer
to the water and increase fuel con-
sumption. Soot and other deposits can be very
moisture-absorbent and may attract moisture
to
form corrosive acids that will deteriorate fireside
metal.
Oean-out should be performed at regular fre-
quent intervals depending upon load, type and
quality
of
fuel, internal boiler temperature, and
combustion efficiency.
Stack temperature can be
used as a guide to determine clean-out intervals,
since an accumulation
of
soot deposits will raise
· the stack temperature.
Tube cleaning
is
accomplished by opening front
and rear doors. Tubes may be brushed from either
end. All loose soot and accumulations should be
removed. Any soot or other deposits should be
removed from the furnace and the tube sheets.
Refer
to Section Q
of
this chapter for instructions .
on properly opening and closing
rear head.
The flue gas outlet and stack should be inspected
annually and cleaned as
necessary. Commercial
firms are available to perform this work. The
stack should also be inspected for damage and
repaired as required.
The fireside should be thoroughly cleaned prior
to any extended lay-up
of
the boiler. Depending
upon circumstances, a protective coating may be
required. See Section
J
in
Chapter 2.
750-150
INSPECfiON
AND MAINTENANCE
C.
WATER
LEVEL
CONTROLS
The need
to
periodically check water level con-
trols and the waterside
of
the pressure vessel
cannot be overemphasized. Most instances
of
major boiler damage are the result
of
operating
with low water or the use
of
untreated (or incor-
rectly) treated water.
Always be sure
of
the boiler water level. On
steam boilers, the water column should be blown
down daily. Check samples
of
boiler water and
condensate
in
accordance
with
procedures
recommended by your water consultant. Refer
to
Sections H and I in Chapter 2 for blowdown
instructions and internal inspection procedures.
Since
~ow
water cut-off devices are generally set
by
the original manufacturer, no attempt should
be made
to adjust these controls
to
alter the point
of
low water cut-off or point
of
pump cut-in or
cut-out.
If
a low water device should become
erratic
iri
operation
or
if its setting changes from
previously
established
levels,
contact
your
Oeaver-Brooks local authorized representative
for assistance.
Steam Boiler
Fig. 7-1
is
a replica
of
the low water cut-off plate
attached
to
a steam boiler. These instructions
should be followed on a definite schedule. These
controls normally function for long periods
of
time, which may lead
to
laxity in testing on the
assumption that normal operation will continue
indefinitely.
On
a steam boiler, the head mechanism
of
the low
water
cut-off device(s) should be removed from
the bowl at least semi-annually to check and
clean the float ball, the internal moving
parts, and
the bowl
or
water column.
CHAPTER 7-3
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