IWAKI AMERICA MDE Series User manual

IWAKI AMERICA
MAGNETIC DRIVE PUMP
MDE SERIES
INSTRUCTION MANUAL

Contents
Item Page
1. Unpacking and Inspection ................................................................................... 3
2. Identification ........................................................................................................ 4
3. Specifications ...................................................................................................... 5
4. Handling Instructions ........................................................................................... 6
5. Installation,PipingandWiring ............................................................................. 7
6. Pump Operation ................................................................................................ 12
7. Maintenance and Inspection.............................................................................. 14
8. TroubleshootingGuide ....................................................................................... 18
9. Parts Description and Exploded View............................................................... 22
10. Disassembly andAssembly of Pump (close-coupled motor type)..................... 24
11. Disassembly andAssembly of Pump (frame mounted motor type) .................. 32
12. Spare Parts........................................................................................................ 41
13. ExternalDimensions and Weights ..................................................................... 42
Thank you for having selected an Iwaki America MDE Series magnetic-drive pump.
This instruction manual deals with the correct handling, maintenance, inspection, and
troubleshooting procedures for the MDE magnetic drive pump. Please read through it
carefully to ensure the optimum performance, safety and long service of your pump.
P/N 180125 Rev. C 5/01

3
Unpacking and Inspection
Open the package and check that the product
conforms to your order. Also, check each of the
following points. If there is a problem or discrep-
ancy, contact your distributor at once.
1. Check that the model, head, capacity, material,
motor output and voltage indicated on the
nameplate conform to the specifications of your
order.
2. Check that all the accessories you ordered are
included.
3. Check that the pump body and parts have not
been accidentally damaged nor any bolts and
nuts loosened in transit.
1
MODEL MDE-
HEAD (FT.)
CAPACITY (GPM)
IMPELLER DIA.
MAT. OF CONST.
OPTIONS
SERIAL NO.
HOLLISTON, MA 01746
IWAKI WALCHEM
MAX. DSGN PRESS. @ 38°C (100°F)
HP 60 Hz.
MAX.
RPM
PSI
IWAKI AMERICA

4
Identification
nModel Code
1 2 3 4 5 6 7
MDE AA 6PKC07
1. Series Name
2. Pump bore symbol (suction ´discharge)
AA: 1 ½ ´1
AB: 3 ´1 ½
3. Impellernominal size
6: 6 inch
8: 8 inch
4. Materials of wetted parts
(portions made of resin)
P: PFA
E: ETFE
5. Bushing material
K: SiC
6. Motor type
C:Frame mounted type motor
F:Flange type motor (close-coupled)
7. Magnet Coupling Rating (@ 3600 RPM)
05: 5 HP 15: 15 HP
07: 7 ½ HP 20: 20 HP
10: 10 HP 25: 25 HP
Options
Nocode: Without option
1: With leak sensor
2: With bearing temperature monitor
3: With bearing creep sensor
4: With bearing flusher
9: With two or more options
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5
Specifications
3600 RPM / 60 Hz
Connections Head Rated Capacity
Model Inlet x Outlet feet gal/min
AA6 1 ½" x 1" 125 75
MDE AA8 250 100
AB6 3" x 1 ½" 125 150
Notes:
1. Standard performance (head/capacity) represents the maximum discharge quantity measured with
pure water at 68° F.
2. Liquid temperature range:
PFA type ... 32~248° F
ETFE type ... 32~212° F
3. Slurry: Hardness 80Hs or below, grain size maximum 2 mil (50 microns), density maximum 5% wt.
Contact IwakiAMERICA or your distributor for details.
nMaterials of main components
3
Material
Part EP
1. Casing Liner
2. Casing Cover
3. Impeller ETFE PFA
4. Magnet
Assembly, inner
5. Containment
Shell
6. Gasket PTFE
7. Bushing,Bearing
inboard
8. Bushing,Bearing
outboard SiC
9. Thrust Collar
inboard
10. Thrust Collar
outboard
11. O-ring Kalrez®

6
Handling Instructions
1. Do not operate the pump dry.
The sliding parts used in the MDE series pumps are lubricated and cooled by the fluid being pumped.
Never operate the pump dry or with the valves on the suction side closed. Otherwise, the inside of the
pump will be damaged. If the pump is unavoidably or accidentally operated dry, with no obvious
damage, allow the pump to cool down for a minimum of one hour before attempting to restart. Do not
allow fluid to enter the pump cavity until the pump has cooled down. Sudden or rapid cooling of the
pump may cause severe damage to the ceramic bearing system. A dry run device is recommended for
the prevention of dry pump operation.
2. Points to be observed upon starting and stopping pump operation.
Pay close attention to the following points to avoid water hammer upon starting and stopping pump
operation. Extra attention is required when the discharge piping is very long.
Starting
Prior to starting the pump, make sure that the power is turned off. Then carry out priming to fill the
pump cavity with liquid. After priming is completed, rotate the coupling (or motor fan) by hand (five
rotations or so) to expel air remaining in the impeller and bearing system of the pump.
Caution
Manually rotate pump drive shaft before start up to ensure ventilation of entrapped air. Failure to do
so may result in damage to the pump bearing system.
Next, close the valves on the discharge side. Now you can turn power on and start up the pump.
When the pump has reached full speed and line pressure is stable, the discharge valving can be opened
to the desired settings.
Caution
If the pump is operated with air remaining in the pump cavity, biting, cracking or breakage of the
bushing and/or thrust collar may occur, causing damage to the pump.
Stopping
When stopping the pump, first close the discharge
valve gradually. When it is completely closed, turn
off the power switch so that the pump stops.
Never stop the pump suddenly by quickly closing a
valve (i.e., solenoid or hydraulic valves).
Caution
Quick valve closure may cause water hammer
which can cause severe damage to the pump.
3. Maximum pressure rating.
The table on the right shows the maximum
pressure rating for each model. Take care that
4

7
the discharge pressure does not exceed the maximum pressure rating.
Contact IwakiAmerica or your distributor for the pressure rating of your pump if you are using an
external flush, casing drain or monitoring options.
4. Handlingofslurryliquid.
In general, slurries should not be handled. If the density is 5% wt or less and the grain size is 2mil
(50 microns) or less, however, pumping is possible. Prior to pumping such slurry liquid, you should call
IwakiAmerica or your distributor to verify if the operation is feasible.
5. Influence of specific gravity on pump performance.
The performance of the pump does not change even for liquids of higher specific gravity. However, a
magnet assembly and motor selected for the specific gravity should be used.
6. Influence of liquid viscosity on pump performance.
When pumping a high viscosity fluid, the discharge head and capacity of the pump may be lower than
in the case of pure water. The required driving power may also vary and should be checked.
7. Intermittentoperation.
Frequent start/stop switching considerably shortens the service life of the pump. Limit the frequency
of switching to six times per hour.
8. Influence of temperature.
The pump itself may not suffer a change in performance due to temperature fluctuation. However, the
liquid may change in terms of viscosity, vapor pressure, and corrosive resistance. Pay special attention
to changes in liquid characteristics as a result of temperature fluctuation.
Installation, Piping and Wiring
nInstallation position
1Install the pump as close to the suction tank as possible (flooded suction). If the suction port of the
pump is positioned higher than the suction tank (suction lift), be sure to arrange a foot valve in the
priming pipe and suction pipe. The lifting capability depends upon the liquid properties, temperature,
and length of suction piping. For details, consult IwakiAmerica or your distributor.
2. The pump can be installed for use indoors or outdoors. However, there should be sufficient space
around the pump to enable efficient and easy maintenance.
nInstallation
1. The pump anchoring area must be greater than the area of the base. If the anchoring area is not large
enough, the base may be damaged due to the concentration of loads placed on it.
2. Set the pump base on a concrete foundation and fasten the anchor bolts tightly to prevent the pump
fromvibrating during operation.
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3. Insert a spacer between the concrete surface and the bottom of the base to level the pump horizon-
tally. Next, put a level on the discharge flange surface to adjust the pump horizontally in the direction
of the pump shaft. Also adjust the direction vertical to the pump shaft at the same time by placing a
level on the suction flange surface. Pour cement mortar into the foundation bolt holes after leveling
has been completed. When the cement mortar is hardened, fasten the anchor bolt nuts firmly. (See
Fig. 1)
4. In case there is influence of motor vibration
during operation(e.g., sympathetic vibration
withpiping), an expansion joint should be
provided between the pump and the piping
before the installation. Otherwise, pipes and
gauges may be damaged.
nPiping 1. Discharge pipe (Use a support to keep
the pump free from the load of the
pipe.)
2. Discharge valve.
3. Check valve.
4. Pressure gauge.
5. Motor.
6. Pump.
7. Priming pipe.
8. Gate valve.
9. Drain ditch.
10. Compound gauge.
11. Suction pipe (Diameter = D) (shortest
horizontal section with an ascending
gradient toward the pump).
12. Pipe support.
13. Pump drain.
14. Suction pipe (D: diameter of pipe).
15. Suction pipe stabilizer brace (Used if
thesuction pipe isparticularly long.)
16. Foot valve.
17. 1.5D or more.
18. 2D, or 24 inches or more.
19. 1~1.5D or more (if sediment accumu-
lates easily).
20. Suction tank.
21. Screen.
22. Short pipe.
Base
Anchor bolt
Spacer

9
nSuction Piping
1. The suction pipe should employ the flooded suction method if possible. The shortest pipe possible, with
a minimum number of bends, should be designed. Arrange a proper support along the suction pipe so
that the load and thermal stress of the pipe itself are not applied to the pump.
2. Attach the coupling on the suction pipe carefully so that no air enters the line. Air in the suction pipe
may prevent priming of the pump.
3. If the suction condition is not good (e.g. the suction tank is a vacuum, the suction head is large, or the
suction pipe is long), NPSHa should always be at least 2 feet greater than NSPHr. For the NPSHr,
refer to the Standard Performance Curve.
4. When a bend is used on the suction side, install a straight pipe which is more than 20 inches long or 10
times as long as the suction port diameter before the suction port of the pump. Use the largest possible
radius of curvature for the bend.
5. Do not allow any projection where air may be trapped along the suction pipe. The suction pipe should
have an ascending gradient toward the pump.
UNACCEPTABLE CONDITIONS
AIR TRAP
AIR TRAP
AIR TRAP
AIR TRAP
GOOD CONDITIONS

10
6. If the diameters of the pump suction port and suction pipe are different, use an eccentric reducer pipe.
Connect the eccentric reducer pipe such that the upper part of it is level. Never use a suction pipe
with a diameter smaller than that of the pump suction port.
7. When using the flooded suction method, the suction pipe should be given a slight ascending gradient
toward the pump so that no air pocket is created on the suction side.
8. The end of the suction pipe should be located 24 inches or more below the surface of the liquid.
9. A screen should be provided at the inlet in the suction tank to prevent the entry of foreign matter into
the suction pipe. Foreign matter may cause malfunctioning of the pump. The end of the suction pipe
should be 1~1.5D or more away from the bottom of the suction tank. (D: diameter of suction pipe).
10. When using the suction lift method, install a foot valve on the suction pipe.
11. When using the flooded suction method, it is recommended that a gate valve be installed on the suction
pipe to enable easier overhaul inspection of the pump. Since this valve is used only in the overhaul
inspection of the pump, keep it fully opened during normal pump operation.
12. Pay close attention to the lowest level of the liquid in the suction tank so that air entrainment to the
suctionpiping will not occur.
The inflow pipe into the suction tank should be distanced from the suction pipe and positioned
below the liquid surface level as a means of preventing air entrainment to the suction pipe. If air
bubbles are generated in the suction tank, install a baffle.
13. It is recommended to install a vacuum/pressure gauge on the suction piping approximately 6 D from
the pump suction flange.
nDischarge piping.
1. Use proper pipe supports so that the weight of the piping does not load the pump nozzle.
2. If a method other than flooded suction is used, install a special pipe for priming.
3. If the piping is very long, its diameter should be determined by calculating the piping resistance.
Otherwise, the specified performance may not be obtained due to increased piping resistance.
4. A check valve should be installed if any of the following conditions exists in the piping:
• The discharge piping is very long.
• The discharge head is 50 feet or more.
• The end of the discharge pipe is 30 feet higher than the surface of the suction tank.
• Several pumps are connected in parallel with the same piping.