EasyManua.ls Logo

Cleaver-Brooks CBH 40 - Chapter 2 The Pressure Vessel; General; Construction; Water Requirements

Default Icon
75 pages
Save Page as PDF
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
CHAPTER 2
TH
p
ESSU
E
VESSEL
A.
GENERAl
B. CONSTRUCTION
C. WATER RECWIREMENTS
1.
HOT
WATER
BOlliER
2.
STEAM
BOlliER
D. WATER TREATMENT
E.
ClEANING
F.
BOilmOUT
OF
A NEW UNIT
G.
WASHING
OUT
H.
BlOWDOWN-STEAM
BOlliER
t PERIODIC INSPECTION
J.
PREPARATION FOR EXTENDED
lAYaUP
A.
GENERAl
This
chapter
is
devoted
primarily
to
the
waterside
care
of
the
pressure
vessel.
Water
requirements
for
both
steam
and
hot
water
boilers
are
essential
to
boiler
life
and
length
of ser-
vice.
Constant
attention
to
this
area
will
pay
divi-
dends
in
the
form
of
longer life, less
down
time,
and
prevention
of
costly
repairs.
Care
taken
in
placing
the
pressure
vessel
into
initial
service is
vital.
The
waterside
of
new
boilers
and
new
or
remodeled
steam
or
hot
water
systems
may
contain
oil, grease
or
other
foreign
matter.
A
method
of
boiling
out
the
vessel
to
remove
these
accumu-
lations
is
described
later
in
this
chapter.
The
subject
of
water
supply
and
treatment
cannot
adequately
be
covered
in
this
manual.
Neverthe-
less
it
is
of
prime
importance.
The
type
of
service
your
boiler
performs
has
an
important
bearing
in
the
amount
of
waterside
care
it
witl
require.
Feedwater
equipment
should
be checked
and
ready
for use. See
that
aU valves, piping,
boiler
feed
pumps,
and
receivers
are
installed
in
accordance
with
prevailing
codes
and
practices.
A boiler,
as
a
part
of
a
hot
water
system,
requires
proper
circulation
and
the
system
must
be
operated
as
intended
by
its
designer
to
avoid
shock
or
severe, possibly
damaging,
stresses
occurring
to
the
pressure
vessel.
The
operator
should
familiarize
himself
with
this
chapter
before
attempting
to
place
the
unit
into
operation.
B. CONSTRUCTION
All
pressure
vessels
are
constructed
in
accordance
with
the
ASME
Boiler
and
Pressure
Vessel Code.
Steam
boilers
for
operation
at
pressure
not
ex-
ceeding 15 psig,
but
within
the
limits
of
good
safety
valve
practices,
are
constructed
to
section
IV, Low
Pressure
Heating
Boilers,
of
this
Code.
Hot
water
boilers
for
operation
with
water
temperature
not
exceeding 240°F.
may
be
built
as
30 psig design,
but
because
of
static
head
may
be
built
up
to
160
psig
design
and
constructed
to
section
IV
of
Low
Pressure
Heating
Boiler
Code.
For
water
tem-
peratures
between
240-250°F,
minimum
design
pressure
is 60 psig,
but
because
of
static
head
may
be
as
high
as
160 psig
and
constructed
to
section
IV
of
Low
Pressure
Heating
Boiler
Code.
Those
steam
boilers
designed
for
operation
ex-
ceeding 15 psig
are
constructed
in
accordance
with
section I
Power
Boilers,
of
the
ASME
Code.
Hot
water
boilers
for
operation
over 250°F
are
likewise
built
to
this
Code.
C. WATER REQUIREMENTS
1.
HOT
WATER
BOilER
Air Removal
The
hot
water
outlet
includes
a
dip
tube
which
ex-
tends
2
to
3
inches
into
the
boiler.
This
dip
tube
reduces
the
possibility
of
any
air
which
may
be
trapped
at
the
top
of
the
shell
from
entering
into
the
system.
Any oxygen
or
air
which
is
released
in
the
boiler
will collect
or
be
trapped
at
the
top
of
the
boiler
shell.
2-1

Table of Contents

Related product manuals