EBARA EFQT3 User Manual
Self Priming Trash Pump
Model EFQT-3
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TABLE OF CONTENTS
INTRODUCTION................................................................................. 4
WARNING – SECTION ...................................................................... 5
INSTALLATION – SECTION B.......................................................... 6
Pump Dimensions............................................................ 7
PRE-INSTALLATION INSPECTION...................................... 7
POSITIONING PUMP............................................................. 7
Lifting................................................................................ 7
Mounting........................................................................... 7
Clearance......................................................................... 7
SUCTION AND DISCHARGE PIPING................................... 7
Materials........................................................................... 7
Line Configuration............................................................ 8
Connections to Pump....................................................... 8
Gauges............................................................................. 8
SUCTION LINES.................................................................... 8
Fittings.............................................................................. 8
Strainers........................................................................... 8
Sealing.............................................................................. 8
Suction Lines in Sumps.................................................... 8
Suction Lines Positioning................................................. 9
DISCHARGE LINES............................................................... 9
Siphoning.......................................................................... 9
Valves............................................................................... 9
Bypass Lines.................................................................... 10
AUTOMATIC AIR RELEASE VALVE..................................... 11
Theory of Operation.......................................................... 11
Air Release Valve Installation........................................... 11
ALIGNMENT........................................................................... 12
Coupled Drivers................................................................ 13
V-Belt Drives..................................................................... 13
OPERATION – SECTION C...............................................................
15
PRIMING................................................................................ 15
STARTING............................................................................. 15
Rotation............................................................................ 15
OPERATION.......................................................................... 16
Lines With a Bypass......................................................... 16
Lines Without a Bypass.................................................... 16
Leakage............................................................................ 16
Liquids Temperature and Overheating............................. 16
Strainer Check.................................................................. 17
Pump Vacuum Check....................................................... 17
STOPPING............................................................................. 17
Cold Weather Preservation............................................... 17
BEARING TEMPERATURE CHECK...................................... 17
EBARA Fluid Handling 2
TABLE OF CONTENTS (continued)
TROUBLESHOOTING – SECTION D................................................ 18
PUMP MAINTENANCE AND REPAIR – SECTION E........................ 22
PERFORMANCE CURVE……………………………………… 22
Pump Model............................................................................ 23
PARTS LISTS .................................................................. 24
Repair Rotating Assembly…………………………………....... 25
PARTS LISTS .................................................................. 26
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY…... 27
Back Cover and Wear Plate Removal……………………. 27
Suction Check Valve Removal…………………………….. 27
Rotating Assembly Removal……………………………….. 27
Impeller Removal……………………………………………. 28
Seal Removal……………………………………………… 29
Shaft and Bearing Removal and Disassembly…………… 31
Shaft and Bearing Reassembly and Installation…………. 31
Seal and Installation…………………………..................... 33
Impeller Installation…………………………………………. 33
Rotating Assembly Installation……….…………………… 34
Suction Check Valve Installation………………………….. 34
Back Cover Installation……………………………………... 34
PRESSURE RELIEF VALVE MAINTENANCE..................................
34
Final Pump Assembly………………………………………. 35
LUBRICATION…………………………………………………………….
35
Seal Assembly.................................................................. 35
Bearings………………….................................................. 35
Power Source................................................................... 35
EBARA Fluid Handling 3
INTRODUCTION
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.
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.
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:
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.
CAUTION! DANGER!
Hazards or unsafe practices which
COULD result in minor personal injury or
product or property damage. These
instructions describe the requirements
and the possible damage which could
result from failure to follow the
procedure.
NOTE
Instructions to aid in installation,
operation, and maintenance or which
clarify a procedure.
EBARA Fluid Handling 4
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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! WARNING!
Before attempting to open or service the
pump:
1. Familiarize yourself with this manual.
2. Disconnect or lock out the powe
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.
WARNING!
This pump is designed to handle mild
industrial corrosives, mud or slurries
containing large entrained solids. Do not
attempt to pump volatile, corrosive, o
flammable materials which may damage
the pump or endanger personnel as
result of pump failure.
After the pump has been positioned,
make certain that the pump and all piping
connections are tight, properly supported
and secure before operation.
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.
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.
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.
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.
WARNING!
WARNING!
WARNING!
WARNING!
EBARA Fluid Handling 5
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.
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.
Pump Dimensions
See Figure 1 for the approximate physical dimensions of this pump.
EFQT-3 OUTLINE DRAWING
(216,0)
8,50
17,00
(432,0)
15,51
(394,0)
7,75
(197,0)
DIMENSIONS:
INCHES
(MILIMETERS)
7,32
(186,0)
8,81
(224,0)
25,82
(656,0)
17,00
(432,0)
2,99
(76,0)
Figure 1 – Pump Model EFQT-3
5,98
152,5
24,50
(622,5)
11,18
284,0
4,01
(102,0)
7,50
(190,5)
0,38[9,6] x 0,19[4,8]
x 3,50[88,9]
1,50 DIA
(38,1)
EBARA Fluid Handling 6
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PRE-INSTALLATION INSPECTION
The pump assembly was inspected and
tested before shipment from the factory.
Before installation, inspect the pump fo
damage which may have occurred during
shipment. Check as follows:
a. Inspect the pump for cracks, dents,
damaged threads, and other obvious
damage.
b. Check for and tighten loose fasteners.
Since gaskets tend to shrink afte
drying, check for loose hardware at
mating surfaces.
c. Carefully read all warnings and
cautions contained in this manual o
affixed to the pump, and perform all
duties indicated. Note the direction o
rotation indicated on the pump. Check
that the pump shaft rotates counterclockwise when facing the back cove
plate assembly/impeller end of the
pump.
CAUTION!
Only operate this pump in the direction
indicate by the arrow on the pump body
and on the accompanying decal. Refer to
ROTATION
d. Check levels and lubricate as
necessary. Refer to LUBRICATION
in the MAINTENANCE AND REPAIR
section of 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 o
lubricants may have exceeded thei
maximum shelf life. These must be
inspected or replaced to ensure
maximum pump service.
If the maximum shelf life has been
exceeded, or if anything appears to be
abnormal, contact your EBARA Pump
distributor or the factory to determine the
repair or updating policy. Do not
pump into service until appropriate
action has been taken.
in OPERATION, Section C.
put the
POSITIONING PUMP
CAUTION!
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 fo
proper operation.
The pump may have to be supported o
shimmed to provide for level operation or to
eliminate vibration.
Clearance
When positioning the pump, allow a
minimum clearance of 18 inches (457 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.
EBARA Fluid Handling 7
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 2 ½
inch (63.5 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 8
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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 o
the suction pipe. The baffle will allo
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 tha
they are separated by a distance equal to a
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 OR G.P.M. x 4085
AREA D²
VELOCITY (M./SEC.) = FLOW (M./MIN)x21.22 OR FLOW (M³/SEC.)
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.
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.
EBARA Fluid Handling 9
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CAUTION!
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 i
does not affect pump discharge capacity;
however, the bypass line should be a
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 wate
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 o
1¼ 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!
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.
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
Valve be installed in the bypass line.
EBARA
reliable, and require minimum maintenance.
See AUTOMATIC AIR RELEASE VALVE in
this section for installation and theory o
operation of the Automatic Air Release
Valve. Contact EBARA for selection of an
utomatic 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 o
the valve without shutting down the station,
and to eliminate the possibility of flooding. I
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.
utomatic Air Release Valves are
utomatic Air Release
DANGER!
If a manual shut-off valve is installed in a
bypass line, it must not be left closed
during operation. A closed manual shutoff valve may 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. Do not remove plates, covers,
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.
fter 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.
EBARA Fluid Handling 10
AUTOMATIC AIR RELEASE VALVE
When properly installed and correctly
adjusted to the specific hydraulic operating
conditions of the application, the EBARA
Automatic Air Release Valve will permit air
to escape through the bypass line, and then
close automatically when the pump is fully
primed and pumping at full capacity.
Theory of Operation
Figures 3 and 4 show a cross-sectional view
of the Automatic Air Release Valve, and a
corresponding description of operation.
Figure 3 – Valve in Open Position
During the priming cycle, air from the pump
casing flows through the bypass line, and
passes through the Air Release valve to the
wet well (Figure 3).
Figure 4 – Valve in Closed Position
When the pump is fully primed, pressure
resulting from flow against the valve
diaphragm compresses the spring and
closes the valve (Figure 4). The valve will
remain closed, reducing the bypass of liquid
to 1 to 5 gallons (3.8 to 19 liters) per minute,
until the pump loses it’s prime or stops.
Some leakage (1 to 5 gallons [3.8 to 19
liters] per minute) will occur when the
valve is fully closed. Be sure the bypass
line is directed back to the wet well or
tank to prevent hazardous spills.
When the pump shuts down, the spring
returns the diaphragm to its original position.
Any solids that may have accumulated in the
diaphragm chamber settle to the bottom and
are flushed out during the next priming cycle.
WARNING!
NOTE
The valve will remain open if the pump
does not reach its designed capacity or
head. Valve closing pressure is
dependent upon the discharge head of
the pump at full capacity. The range of
the valve closing pressure is established
by the tension rate of the spring as
ordered from the factory. Valve closing
pressure can be further adjusted to the
exact system requirements by moving
the spring retaining pin up or down the
plunger rod to increase or decrease
tension on the spring. Contact your
EBARA distributor or EBARA for
information about an Automatic Air
Release Valve for your specific
application.
Air Release Valve installation
The Automatic Air Release Valve must be
independently mounted in a horizontal
position and connected to the discharge line
of the self-priming centrifugal pump (see
Figure 5).
NOTE
If the Air Release Valve is to be installed
on a staged pump application, contact
the factory for specific installation
instructions.
EBARA Fluid Handling 11
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