CHAPTER 2
THE
PRESSURE VESSEL
A
Hgh
level
of
water: Feed
pump
turns off at this point
Fill
pressure
"V88881
initially to thie
height
B.
Pump
tu~
on wnen water level
reac:tlee
B.
Dis:tances
A-8
is
approximately 3/4 inch.
C.
low
Water
Cutoff Point Burner
wiH
shut
off
if
water level
Jowers
to
thMa
point
0.
First
visi~e
point of gauge glase.
[FIGURE 2·3 I BOILER WATER
LEVEL
DETAILS (STEAM BOILER)]
Water
Feeder Operation
This type
of
operation
is
usually applicable to
boilers operating at
15
psi
steam
or
less.
It
is
only
necessary to open the water supply line valve and
the water feeder discharge valve. The water
feeder should close when the water reaches the
proper level
as
shown in Fig. 2-3.
CHAPTER
2..6
NOTE:
In the event that water column
isolation valves are provided
or
installed, it must
be
established
that. these valves are not only
open but that they are sealed
or
locked in the open position.
If
these valves are installed, it
is
il-
legal to operate the boiler with
closed
or
unsealed open
valv~.
!WARNING
The
Isolation
valves
and
the
water
column
piping
must
be
locked
In
the
open
position
during operation. Failure to do so
may
result in a low water condi-
tion, catastrophic
failure, serious
personal
injury
or
death.
D.
WATER
TREATMENT
Maximum effectiveness and long trouble-free
life
of
pressure vessels, at the lowest cost consis-
tent with good engineering and operating prac-
tice, are functions
of
properly treated boiler
feedwater. Contact your Cleaver-Brooks local
representatitive
for information
on
how to
prevent the presence
of
unwanted solids and
corrosive gases.
The objectives
of
water treatment
in
general are:
(1)
Prevention
of
hard scale deposits or
soft sludge deposits that impair the rate
of
heat transfer and that lead to over-
heated metal and costly down-time and
repairs.
(2) Elimination
of
corrosive gases
in
the
supply or boiler water.
750-150
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