EBARA EFQT12 User Manual
Self Priming Trash Pump
Model EFQT-12
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TABLE OF CONTENTS
INTRODUCTION........................................................................................... Pg. 03
WARNING – SECTION A ............................................................................ Pg. 04
INSTALLATION – SECTION B.................................................................... Pg. 05
Pump Dimensions...................................................................... Pg. 05
PREINSTALLATION INSPECTION................................................. Pg. 06
POSITIONING PUMP...................................................................... Pg. 06
Lifting.......................................................................................... Pg. 06
Mounting..................................................................................... Pg. 06
Clearance................................................................................... Pg. 06
SUCTION AND DISCHARGE PIPING............................................. Pg. 06
Materials..................................................................................... Pg. 06
Line Configuration...................................................................... Pg. 07
Connections to Pump................................................................. Pg. 07
Gauges....................................................................................... Pg. 07
SUCTION LINES.............................................................................. Pg. 07
Fittings........................................................................................ Pg. 07
Strainers..................................................................................... Pg. 07
Sealing....................................................................................... Pg. 07
Suction Lines in Sumps.............................................................. Pg. 07
Suction Lines Positioning........................................................... Pg. 08
DISCHARGE LINES......................................................................... Pg. 08
Siphoning................................................................................... Pg. 08
Valves......................................................................................... Pg. 08
Bypass Lines.............................................................................. Pg. 09
AUTOMATIC AIR RELEASE VALVE............................................... Pg. 10
Theory of Operation................................................................... Pg. 10
Air Release Valve Installation..................................................... Pg. 10
ALIGNMENT.................................................................................... Pg. 11
Coupled Drivers.......................................................................... Pg. 12
V-Belt Drives.............................................................................. Pg. 12
OPERATION – SECTION C.........................................................................
Pg. 14
PRIMING.......................................................................................... Pg. 14
STARTING....................................................................................... Pg. 14
Rotation...................................................................................... Pg. 14
OPERATION.................................................................................... Pg. 15
Lines With a Bypass................................................................... Pg. 15
Lines Without a Bypass.............................................................. Pg. 15
Leakage...................................................................................... Pg. 15
Liquids Temperature and Overheating....................................... Pg. 15
Strainer Check............................................................................ Pg. 16
Pump Vacuum Check................................................................. Pg. 16
STOPPING....................................................................................... Pg. 16
Cold Weather Preservation........................................................ Pg. 16
BEARING TEMPERATURE CHECK............................................... Pg. 16
EBARA Fluid Handling 1
PERFORMANCE CURVE……………………………………….......... Pg. 21
Pump Model and Repair Rotating Assembly ....………….......... Pg. 22
PARTS LISTS ................................................................................. Pg. 23
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY…............ Pg. 25
Suction Check Valve Disassembly ………………………........... Pg. 25
Pump Disassembly …………………………………………......... Pg. 25
Seal Disassembly …………………………..………………......... Pg. 26
Impeller Shaft and Bearing Disassembly .......……………......... Pg. 27
Impeller Shaft and Bearing Reassembly ……….........….......... Pg. 27
Seal Reassembly …………..……….……………………............ Pg. 28
Pump Reassembly …………………………………………......... Pg. 29
Suction Check Valve Reassembly ………………………............ Pg. 30
Seal Assembly ......................................................................... Pg. 30
Bearings .................................................................................... Pg. 30
TROUBLESHOOTING – SECTION D ………………………............ Pg. 18
PUMP MAINTENANCE AND REPAIR – SECTION E……….......... Pg. 21
LUBRIFICATION ............................................................................ Pg. 30
TABLE OF CONTENTS
(Continued)
EBARA Fluid Handling 2
INTRODUCTION
p
This Installation, Operation, and
Maintenance manual is designed to help
you get the best performance and
longest life from your EBARA pump.
This pump is a EFQT Series, semi-open
impeller, self- priming centrifugal model
with a suction check valve.
If there are any questions regarding the pump or its applications which are not covered in this manual or
in other literature accompanying this unit, please contact your EBARA distributor, or write:
The pump is designed for handling mild
industrial corrosives, mud or slurries
containing large entrained solids. The basic
material of construction is gray iron, with
ductile iron impeller and steel wearing parts.
EBARA Fluid Handling
1651 Cedar Line Drive
Rock Hill, SC 29730
For information or technical assistance on the power source, contact the power source manufacture’s
local dealer or representative.
The following are used to alert maintenance personnel to procedures which require special attention, to
those which could damage equipment, and to those which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure required
and the injury which will result from failure
to follow procedure.
DANGER!
Hazardous or unsafe practices could result in
minor personal injury, product or property
damage. These instructions describe the
requirements and the possible damage which
could result from failure to follow the
rocedure.
Instructions to aid in installation, operation,
and maintenance or which clarify a procedure.
CAUTION!
NOTE
EBARA Fluid Handling 3
SAFETY – SECTION A
These warnings apply to EFQT series basic
pumps. EBARA has no control over or particular
knowledge of the power source which will be
used. Refer to the manual accompanying the
power source before attempting to begin
operation.
WARNING!
Before attempting to open or service the
pump
1. Familiarize yourself with this manual.
2. Disconnect or lock out the power source to
ensure that the pump will remain inoperative.
3. Allow the pump to cool if overheated.
4. Check the temperature before opening any
covers, plates, or plugs.
5. Close the suction and discharge valves.
6. Vent the pump slowly and cautiously.
7. Drain the pump
This pump is designed to handle mild
industrial corrosives, mud or slurries
containing large entrained solids. Do not
attempt to pump volatile, corrosive, or
flammable materials which may damage the
pump or endanger personnel as result of
pump failure.
:
WARNING!
WARNING!
After the pump has been positioned, make
certain that the pump and all piping
connections are tight, properly supported and
secure before operation.
WARNING!
Do not operate the pump without the guards in
place over the rotating parts.
Exposed rotating parts can catch clothing,
fingers, or tools, causing severe injury to
personnel.
WARNING!
Do not remove plates, covers, gauges, pipe
plugs, or fittings from an overheated pump.
Vapor pressure within the pump can cause parts
being disengaged to be ejected with great force.
Allow the pump to cool before servicing.
WARNING!
Do not operate the pump against a closed
discharge valve for long periods of time. If
operated against a closed discharge valve, pump
components will deteriorate, and the liquid could
come to a boil, pressure, and cause the pump
casing to rupture or explode .
WARNING!
Use lifting and moving equipment in good repair
and with adequate capacity to prevent injuries to
personnel or damage to equipment. Suction and
discharge hoses and piping must be removed
form the before lifting
EBARA Fluid Handling 4
INSTALLATION – SECTION B
Review all SAFETY information in Section A.
Since pump installations are seldom identical, this
section offers only general recommendations and
practices required to inspect, position and arrange
the pump and piping.
Most of the information pertains to a standard
static lift application where the pump is
positioned above the level of liquid to be pumped.
If installed in a flooded suction application
where the liquid is supplied to the pump under
pressure, some of the information such as
mounting, line configuration, and priming must be
tailored to the specific application.
OUTLINE DRAWING
Figure 1 Pump Model EFQT-12
Since the pressure supplied to the pump is critical to
performance and safety, be sure to limit incoming
pressure to 50% of the maximum permissible
operating pressure as shown on the pump
performance curve.
For further assistance, contact your EBARA
distributor or EBARA Fluid Handling.
Pump Dimensions
See Figure 1 for the approximate physical
dimensions of this pump.
EBARA Fluid Handling 5
PREINSTALLATION INSPECTION POSITIONING PUMP
The pump assembly was inspected and tested
before shipment from the factory. Before
installation, inspect the pump for damage which
may have occurred during shipment. Check as
follows:
Only operate this pump in the direction
indicate by the arrow on the pump body and
on the accompanying decal. Refer to
ROTATION
If the maximum shelf life has been exceeded,
or if anything appears to be abnormal, contact
your EBARA distributor or the factory to
determine the repair or updating policy. Do not
put the pump into service until appropriate
action has been taken.
a. Inspect the pump for cracks, dents,
damaged threads, and other obvious
damage.
b. Check for and tighten loose attaching
fasteners. Since gaskets tend to shrink
after drying, check for loose hardware at
mating surfaces.
c. Carefully read all warnings and cautions
contained in this manual or affixed to the
pump, and perform all duties indicated.
Note the direction of rotation indicated on
the pump. Check that the pump shaft
rotates counterclockwise when facing the
back cover plate assembly/impeller end of
the pump.
CAUTION!
in OPERATION, Section C.
d. Check levels and lubricate as
necessary. Refer to LUBRICATION
MAINTENANCE AND REPAIR
this manual and perform duties as
instructed.
e. If the pump and power source have
been stored for more than 12 months,
some of the components or lubricants may
have exceeded their maximum shelf life.
These must be inspected or replaced
ensure maximum pump service.
EBARA Fluid Handling 6
in the
section of
to
Lifting
Use lifting equipment with a capacity of at least
13.230 pounds (6000 Kg). This pump weighs
approximately 2350 pounds (1066 Kg), not
including the weight of accessories and base.
Customer installed equipment such as suction and
discharge piping must be removed before
attempting to lift.
The pump assembly can be seriously
damaged if the cables or chains used to lift
and move the unit is improperly wrapped
around the pump.
Mounting
Locate the pump in an accessible place as close as
practical to the liquid being pumped. Level mounting
is essential for proper operation.
The pump may have to be supported or shimmed to
provide for level operation or to eliminate vibration.
Clearance
When positioning the pump, allow a minimum
clearance of 40 inches (800 mm) in front of the back
cover to permit removal of the cover and easy
access to the pump interior.
SUCTION AND DISCHARGE PIPING
Pump performance is adversely affected by
increase suction lift, discharge elevation and friction
losses. See the performance curve and operating
range shown on Page 21 to be sure your overall
application allows pump to operate within the
safe operation range.
Materials
Either pipe or hose maybe used for suction and
discharge lines: however, the materials must be
compatible with liquid being pumped.
CAUTION!
If hose is used in suction lines, it must be the
rigid-wall, reinforced type to prevent collapse
under suction. Using piping couplings in suction
lines is not recommended.
Line Configuration
Keep suction and discharge lines as straight as
possible to minimize friction losses. Make
minimum use of elbows and fittings, which
substantially increase friction loss. If elbows are
necessary, use the long radius type to minimize
friction loss.
Connections to Pump
Before tightening a connecting flange, align it
exactly with the pump port. Never pull a pipe line
into place by tightening the flange bolts and/or
couplings.
Lines near the pump must be independently
supported to avoid strain on the pump which
could cause excessive vibration, decrease
bearing life, and increased shaft and seal wear.
If hose-type lines are used, they should have
adequate support to secure them when filled
with liquid and under pressure.
Gauges
Most pumps are drilled and tapped for installing
discharge pressure and vacuum suction gauges.
If these gauges are desired for pumps that are
not tapped, drill and tap the suction and
discharge lines not less than 18 inches
(457,2mm) from the suction and discharge ports
and install the lines. Installation closer to the
pump may result in erratic readings.
SUCTION LINES
To avoid air pockets which could affect pump
priming, the suction line must be as short and
direct as possible. When operation involves a
suction lift, the line must always slope upward to
the pump from the source of the liquid being
pumped: if the line slopes down to the pump at
any point along the suction run, air pockets will
be created.
Fittings
Suction lines should be the same size as the pump
inlet. If reducers are used in suction lines, they should
be the eccentric type, and should be installed with the
flat part of the reducers uppermost to avoid creating
air pockets. Valves are not normally used in suction
lines, but if a valve is used, install it with the horizontal
to avoid air pockets.
Strainers
If a strainer is furnished with the pump, be certain to
use it; any spherical solids which pass through a
strainer furnished with the pump will also pass
through the pump itself.
If a strainer is not furnished with the pump, but is
installed by the pump user, make certain that the total
area of the openings in the strainer is at least three or
four times the cross section of the suction line, and
that the openings will not permit passage of solids
larger than the solids handling capability of the pump.
This pump is designed to handle up to 3 inch (76,2
mm) diameter spherical solids.
Sealing
Since even a slight leak will affect priming, head, and
capacity, especially when operating with a high
suction lift, all connections in the suction line should
be sealed with pipe dope to ensure an airtight seal.
Follow the sealant manufacturer’s recommendations
when selecting and applying the pipe dope. The pipe
dope should be compatible with the liquid being
pumped.
Suction Lines in Sumps
If a single suction line is installed in a sump, it should
be positioned away from the wall of the sump at a
distance equal to 1 ½ times the diameter of the
suction line.
If there is a liquid flow from an open pipe into the
sump, the flow should be kept away from the suction
inlet because the inflow will carry air down into the
sump, and air entering the suction line will reduce
pump efficiency.
EBARA Fluid Handling 7
If it is necessary to position inflow close to
the suction inlet, install a baffle between the
inflow and the in suction lines, it must be the
rigid-wall, reinforced type to prevent collapse
under suction. Using piping couplings in
suction lines is not recommended. Suction
inlet at a distance 1 ½ times the diameter of
the suction pipe. The baffle will allow
entrained air to escape from the liquid before
it is drawn into the suction inlet.
If two suction lines are installed a single
sump, the flow paths may interact, reducing
the efficiency of one or both pumps. To avoid
this, position the suction inlets so that they
are separated by a distance equal to at least
3 times the diameter of the suction pipe.
Suction Line Positioning
The depth of submergence of the suction line is
critical to efficient pump operation. Figure 2 shows
Recommended minimum submergence vs. velocity.
NOTE
The pipe submergence required may be reduced
by installing a standard pipe increaser fitting at
the end of the suction line. The larger opening
size will reduce the inlet velocity. Calculate the
required submergence using the following
formula based on the increased opening size
(area or diameter).
VELOCITY (FT./SEC.)= QUANT. (G.P.M)x.321
AREA D²
VELOCITY (M./SEC.)= FLOW (M./MIN)x21.22
DIAMETER IN MM² AREA IN M²
Figure 2. Recommended Minimum Suction Line Submergence vs. Velocity
DISCHARGE LINES
Siphoning
Do not terminate the discharge line at a level lower
than of the liquid being pumped unless a siphon
breaker is used in the line. Otherwise, a siphoning
action causing damage to the pump could result.
EBARA Fluid Handling 8
OR G.P.M. x 4085
OR FLOW (M³/SEC.)
Valves
If a throttling valve is desired in the discharge line,
use a valve as large as the largest pipe to minimize
friction losses. Never install a throttling valve in a
suction line.
With high discharge heads, it is recommended that a
throttling valve and a system check valve be installed
in the discharge line to protect the pump from
excessive shock pressure and reverse rotation when
it is stopped.
If the application involves a high discharge head,
gradually close the discharge throttling valve before
stopping the pump.
Bypass Lines
Self-priming pumps are not air compressors. During
the priming cycle, air from the suction line must be
vented to atmosphere on the discharge side. If the
discharge line is open and a check valve has been
installed in the discharge line, the discharge side of
the pump must be opened to atmospheric pressure
through a bypass line installed between the pump
discharge and the check valve. A self-priming
centrifugal pump will not prime if there is sufficient
static liquid head to hold the discharge check valve
closed.
NOTE
The bypass line should be sized so that it does
not affect pump discharge capacity; however,
the bypass line should be at least 1 inch in
diameter to minimize the chance of plugging.
In low discharge head applications (less than 30
feet or 9 meters), it is recommended that the bypass
line be run back to the wet well, and locate 6 inches
below the water level or cut-off point of the level
pump. In some installations, this bypass line may be
terminated with a six-to-eight foot length of 1 ¼ inch
ID. smooth-bore hose; air and liquid vented during
the priming process will then agitate the hose and
break up any solids, grease, or other substances
likely to cause clogging.
CAUTION!
CAUTION!
A bypass line that is returned to a wet well must
be secured against being drawn into the pump
suction inlet.
It is also recommended that pipe unions be installed
at each 90º elbow in a bypass line to ease
disassembly and maintenance.
EBARA Fluid Handling 9
In high discharge head applications (more than
30 feet), an excessive amount of liquid may be
bypassed and forced back to the wet well under
the full working pressure of the pump; this will
reduce overall pumping efficiency. Therefore, it is
recommended that a EBARA Automatic Air
Release Valve be installed in the bypass line.
EBARA Automatic Air Release Valves are reliable,
and require minimum maintenance. See
AUTOMATIC AIR RELEASE VALVE in this
section for installation and theory of operation of
the Automatic Air Release Valve. Contact EBARA
Fluid Handling for selection of an Automatic Air
Release Valve to fit your application.
If the installation involves a flooded suction such as
below-ground lift station, a pipe union and manual
shut-off valve may be installed in the bleed line to
allow service of the valve without shutting down the
station, and to eliminate the possibility of flooding.
If a manual shut-off valve is installed anywhere in
the air release piping, it must be a full-opening ball
type valve to prevent plugging by solids.
DANGER!
If a manual shut-off valve is installed in a
bypass line, it must not be left closed during
operation
cause a pump which has lost prime to continue
to operate without reaching prime, causing
dangerous overheating and possible explosive
rupture of the pump casing. Personnel could
be severely injured.
Allow an over-heated pump to cool before
servicing
gauges, or fittings from an overheated pump.
Liquid within the pump can reach boiling
temperatures, and vapor pressure within the
pump can cause parts being disengaged to be
ejected with great force. After the pump cools,
drain the liquid from the pump by removing the
casing drain plug. Use caution when removing
the plug to prevent injury to personnel from hot
liquid.
. A closed manual shut-off valve may
. Do not remove plates, covers,
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