CHAPTER7
WARNING
SAFE OPERATION OF YOUR GENERATOR DEMANDS PERl·
OOIC INSPECTION ANO MAINTENANCE OF ALL LOW
WATERCUT.QFF DEVICES. OPENANO INSPECTTHEMAT
LEAST
ONCE A MONTH. UNCER CONSTANT ATTENDANCE
ANO WITH
BURNER IN LOW FIRE POSITION, CHECK
OPERAT10N FREQUENTLY
BY STOPPING WATER FLON
TO GENERATOR, ANO ALLOWING WATER LEVEL TO
LOWER IF CONTROLS
00
NOT CUT OFF BURNER AT
PROPER SAFE WATER
LEVS.
OR APPEAR IN POOR
PHYSa·
CAL CONOITION, REPAIR OR REPLACE AT ONCE.
[FIGURE
7-1
I
L.OW
WATER
PlATE]
Remove the pipe plugs
from
the
tees
or crosses
and
make certain
the
cross-connecting piping
is
clean
and
free of obstructions. Controls
must
be
mounted
in
a plumb position
for
proper perfor-
mance. Verify that piping
is
vertically aligned.
A blowdown
of
the
water controls on a steam
boiler should
be performed daily.
Hot Water Boiler
It
is
impractical
to
blowdown
the
low
water
cut-off
devices on a hot water boiler since
the
entire water content
of
the
system would become
involved. Many hot water systems are fully
closed
and any
loss
of
water will require make-up
and
additional feedwater treatment that might
not
otherwise be necessary. Since
the
boiler
and
sys
..
tem
arrangement usually makes
it
impractical
to
perform daily
and
monthly maintenance of
the
low
water cut-off devices,
it
is
essential
to
verify
proper operation and remove the operating
mechanism
from
the
bowl annually or
more
fre-
quently, if possible, to check
and
clean
the
float
ball, internal moving parts,
and
the
bowl
housing.
Also
check
the
cross-connecting piping
to
make
certain that
it
is
clean
and
free of obstruction.
D.
WATER
GAUGE
GLASS
A broken or discolored glass should be replaced
at
once. Periodic replacement should be a part
of
the
maintenance program. Always
use
new
gas-
kets
when
replacing a glass.
Use
a proper size
CHAPTER7-4
INSPECriON
AND MAINTENANCE
rubber packing.
Do
not
use
"loose packing,"
which could
be
forced below
the
glass
and
pos-
sibly plug
the
valve opening.
Qose
the
valves when replacfug
the
glass. Slip a
. packing nut, a
packing washer,
and
packing ring
onto each end
of
the
glass. Insert one
end
of
the
glass into
the
upper gauge valve body
far
enough
to allow the lower
end
to be dropped
into
the
lower body. Slide
the
packing nuts onto each
valve
and
tighten.·
It
is
recommended that
the
boiler
is
off'
and
cool
when
the
gauge glass
is
replaced, however
if
the
glass
is
replaced while
the
boiler
is
in
service,
open
the
blowdown
and
slowly bring
the
glass
to
operating temperature
by
opening
the
gage val-
ves
slightly. After
the
glass
is
warmed
up,
close
the
blowdown valve
and
open
the
gauge valves
completely.
!WARNING
Use
care
when
changing·
the
gauge glass while the boiler is in
service. Wear protective
cloth-
Ing and eye protection
to
avoid
serious
personal
injury
or
death.
Check
try--cocks
and
gauge cocks
for
operation
and
clean
as
required. It
is
imperative that
the
gauge cocks
are
mounted
in
exact alignment. If
they
are
not,
the
glass will be strained
and
may
fail
prematurely.
E.
ELECTRICAL
CONTROLS
The operating controls should
be
inspected
monthly. Examine
the
tightness
of
electrical con-
nections
and
keep
the
controls clean. Remove
any
dust that accumulates
on
the
interior of
the
control using
low
pressure
air.
Take care
not
to
damage
the
mechanism.
Examine
any
mercury
tube
switches
for
damage
or cracks. Dark scum over
the
normally bright
surface of
the
mercury
may
lead
to
erratic switch- .
ing
action.
Make
certain that controls
are
correct-
750-150
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