Installation
Installation
Installation
Installation
Installation
Installation
Installation of
of
of this
this
this equipment
equipment
equipment involves
involves
involves potentially
potentially
potentially
hazardous
hazardous
hazardous procedures.
procedures.
procedures. Only
Only
Only trained
trained
trained and
and
and qualified
qualified
qualified
personnel
personnel
personnel who
who
who have
have
have read
read
read and
and
and who
who
who understand
understand
understand
the
the
the information
information
information in
in
in this
this
this manual
manual
manual should
should
should install
install
install this
this
this
equipment.
equipment.
equipment.
••• All
All
All electrical
electrical
electrical wiring
wiring
wiring must
must
must be
be
be done
done
done by
by
by a
a
a qualified
qualified
qualified
electrician
electrician
electrician and
and
and comply
comply
comply with
with
with all
all
all local
local
local codes
codes
codes and
and
and
regulations
regulations
regulations
General
General
General Information
Information
Information
The
The
The Typical
Typical
Typical Installation
Installation
Installation shown
shown
shown is
is
is only
only
only a
a
a guide
guide
guide for
for
for
selecting
selecting
selecting and
and
and installing
installing
installing system
system
system components.
components.
components. Contact
Contact
Contact
your
your
your Graco
Graco
Graco distributor
distributor
distributor for
for
for assistance
assistance
assistance in
in
in planning
planning
planning a
a
a
system
system
system to
to
to suit
suit
suit your
your
your needs.
needs.
needs. Always
Always
Always use
use
use Genuine
Genuine
Genuine
Graco
Graco
Graco Parts
Parts
Parts and
and
and accessories.
accessories.
accessories. Be
Be
Be sure
sure
sure all
all
all accessories
accessories
accessories
are
are
are adequately
adequately
adequately sized
sized
sized and
and
and pressure
pressure
pressure rated
rated
rated to
to
to meet
meet
meet the
the
the
system’s
system’s
system’s requirements.
requirements.
requirements.
Reference letters in the text, for example (A), refer to
the callouts in the figures.
Tighten
Tighten
Tighten Fasteners
Fasteners
Fasteners
Before
Before
Before mounting
mounting
mounting and
and
and using
using
using the
the
the pump
pump
pump for
for
for the
the
the first
first
first time,
time,
time,
check
check
check and
and
and retorque
retorque
retorque all
all
all external
external
external fasteners.
fasteners.
fasteners. Follow
Follow
Follow
Torque
Torque
Torque Instructions
Instructions
Instructions,,, page
page
page 22
22
22
,,, or
or
or see
see
see the
the
the torque
torque
torque
tag
tag
tag on
on
on your
your
your pump.
pump.
pump. After
After
After the
the
the first
first
first day
day
day of
of
of operation,
operation,
operation,
retorque
retorque
retorque the
the
the fasteners.
fasteners.
fasteners.
Tips
Tips
Tips to
to
to Reduce
Reduce
Reduce Cavitation
Cavitation
Cavitation
Cavitation
Cavitation
Cavitation in
in
in a
a
a double
double
double diaphragm
diaphragm
diaphragm pump
pump
pump is
is
is the
the
the
formation
formation
formation and
and
and collapse
collapse
collapse of
of
of bubbles
bubbles
bubbles in
in
in the
the
the pumped
pumped
pumped
liquid.
liquid.
liquid. Frequent
Frequent
Frequent or
or
or excessive
excessive
excessive cavitation
cavitation
cavitation can
can
can cause
cause
cause
serious
serious
serious damage,
damage,
damage, including
including
including pitting
pitting
pitting and
and
and early
early
early wear
wear
wear of
of
of
fluid
fluid
fluid chambers,
chambers,
chambers, balls,
balls,
balls, and
and
and seats.
seats.
seats. It
It
It may
may
may result
result
result in
in
in
reduced
reduced
reduced efficiency
efficiency
efficiency of
of
of the
the
the pump.
pump.
pump. Cavitation
Cavitation
Cavitation damage
damage
damage
and
and
and reduced
reduced
reduced efficiency
efficiency
efficiency both
both
both result
result
result in
in
in increased
increased
increased
operating
operating
operating costs.
costs.
costs.
Cavitation depends on the vapor pressure of the
pumped liquid, the system suction pressure, and the
velocity pressure. It can be reduced by changing any
of these factors.
1.
1.
1.
Reduce
Reduce
Reduce vapor
vapor
vapor pressure:
pressure:
pressure: Decrease
Decrease
Decrease the
the
the
temperature
temperature
temperature of
of
of the
the
the pumped
pumped
pumped liquid.
liquid.
liquid.
2.
2.
2.
Increase
Increase
Increase suction
suction
suction pressure:
pressure:
pressure:
a.
a.
a.
Lower
Lower
Lower the
the
the installed
installed
installed position
position
position of
of
of the
the
the pump
pump
pump
relative
relative
relative to
to
to the
the
the liquid
liquid
liquid level
level
level in
in
in the
the
the supply.
supply.
supply.
b.
b.
b.
Reduce
Reduce
Reduce the
the
the friction
friction
friction length
length
length of
of
of the
the
the suction
suction
suction
piping.
piping.
piping. Remember
Remember
Remember that
that
that fittings
fittings
fittings add
add
add friction
friction
friction
length
length
length to
to
to the
the
the piping.
piping.
piping. Reduce
Reduce
Reduce the
the
the number
number
number of
of
of
fittings
fittings
fittings to
to
to reduce
reduce
reduce the
the
the friction
friction
friction length.
length.
length.
c.
c.
c.
Increase
Increase
Increase the
the
the size
size
size of
of
of the
the
the suction
suction
suction piping.
piping.
piping.
NOTE:
NOTE:
NOTE: Be
Be
Be sure
sure
sure the
the
the inlet
inlet
inlet fluid
fluid
fluid pressure
pressure
pressure does
does
does not
not
not
exceed
exceed
exceed 25%
25%
25% of
of
of the
the
the outlet
outlet
outlet working
working
working pressure.
pressure.
pressure.
3.
3.
3.
Reduce
Reduce
Reduce liquid
liquid
liquid velocity:
velocity:
velocity: Slow
Slow
Slow the
the
the cyclic
cyclic
cyclic rate
rate
rate of
of
of
the
the
the pump.
pump.
pump.
Pumped liquid viscosity is also very important but
normally is controlled by factors that are process
dependent and cannot be changed to reduce
cavitation. Viscous liquids are more difficult to pump
and more prone to cavitation.
Graco recommends taking all the above factors
into account in system design. To maintain pump
efficiency, supply only enough power to the pump to
achieve the required flow.
Graco distributors can supply site specific
suggestions to improve pump performance and
reduce operating costs.
3A7036E
9
All manuals and user guides at all-guides.com
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