CHAPTER2
(2) Partial
or
total
old
system is involved.
(3)
Conditions
may
prevent
adequate
cleaning
of
piping.
The
pressure vessel
waterside
should
be in-
spected
on
a periodic basis. This will reveal true
internal conditions and
serve
as a
check
against
conditions indicated by chemical analysis
of
the
boiler water. Inspection should be made three
months after initial starting and at regular
6-, 9-,
or
12-month intervals thereafter.
The
frequency
of
further periodic inspections will depend upon
the internal conditions found.
If
any unwanted conditions are observed, contact
your
Cleaver-Brooks
local representative for
recommendations.
Any sludge, mud,
or
sediment
found will have to
be
flushed out.
The
effectiveness
of
the blow
..
down
practiced
on
steam
boilers
should
be
verified and
scheduling
or
frequency
of
blow-
down
may have to be revised.
The
need for
periodic draining
or
washout
will also be indi
~
cated.
Any
oil
or
grease present
on
the heating surfaces
should be removed promptly by a
boil-out with ·
an
alkaline detergent solution.
NOTE:
Temperature
of
initial
fill
of
water for hydrostatic tests, boil-
out,
or
for
normal
operation
should be as stated in
the
ASME
Boiler Code.
F.
BOIL-OUT
OF
A NEW UNIT
The
internal surfaces
of
a newly installed boiler
may have oil, grease
or
other
protective coatings
used
in
manufacturing.
Such
coatings must be
removed since they lower the heat transfer rate
and could cause over-heating
of
a tube. Before
boiling
out
procedures may begin, the burner
CHAPTER 2-8
THE
PRESSURE VESSEL
should be ready for
fuing.
The
operator must
be
familiar
with
the
procedure
outlined
under
burner operation.
!WARNING
Use
of
a suitable face mask,
gog-
gles, rubber gloves, and protec-
tive
garments
Is
strongly
recommended when handling
or
mixing caustic chemicals.
Do
not
permit the
dry
material
or
the con-
centrated
solution
to
come
in
contact
with
skin
or
clothing.
Failure
to
follow
these precau-
tions
could result in serious per-
sonal
injury
or
death.
Your Cleaver-Brooks local representative
wiU
be
able to
recommend a cleaning
or
boil-out prOce-
dure. In the
event
such
service is unavailable
or
is
yet unscheduled, the following information
may be
of
assistance.
There are several chemicals suitable for this
pur-
pose.
Soda
ash (sodium carbonate) and caustic
soda (sodium hydroxide at the rate
of
3 to 5
pounds
each
per
1,000 pounds
of
water, along
with a small
amount
of
laundry detergent added
as
a wetting agent is
one
combination often used.
Generator
JYatcr-
O:allccs
, JYatct-
Wci~bt
Si?P:<IOI.
Normal
I
F"
"'lOCrec
I
Nnrm~l
I
F1CXXIea
100
875
1032
7260
8570
125
825
980
6825
8130
150
995
1180
8270
9810
200
1335
1580
11070
13100
250
1371
1630
11380
13510
300
1635
1935
13550
16050
350
1870
2220
15525
18420
400
2175 2570
18070
21350
(FIG. 2-4 I WATER
CAPACirf
CHARn
750-150
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