IWAKI PUMPS MDF-L User manual

Read this instruction manual before use of product
IWAKI Magnetic Drive Pump
Model MDF-L
Instruction Manual
(European Edition)
T313-6 '05/04
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( )Country codes
IWAKI CO.,LTD. 6-6 Kanda-Sudacho 2-chome Chiyoda-ku Tokyo 101-8558 Japan
TEL:[phone] FAX:[phone](http://www.iwakipumps.jp)
This product is protected by patent.

Thank you for selecting the IWAKI Magnetic Drive Pump type MDF-L. This instruction
manual has been prepared to ensure correct and safe handling of the pump. Please read this
manual carefully and thoroughly prior to operating the pump.
Pay special attention to the "Safety Instruction to Prevent Personal Injuries," "Warning," and
"Caution" messages included in this manual.
This instruction manual should be kept by each end user and within reach of the actual
operator, for quick reference when needed.
Contents
IMPORTANT INSTRUCTIONS ................................................. 1~3
Safety instructions to prevent personal injuries
OUTLINE OF PRODUCT ............................................................ 4
1. Unpacking and inspection ........................ 5
2. Description on body and label .................. 5
3. Model code ............................................... 6
4. Names of parts ········································· 8
INSTALLATION ........................................................................... 10
1. Installation .............................................. 11
2. Piping ..................................................... 12
3. Electrical wiring ...................................... 14
OPERATION ................................................................................ 15
1. Precautions on operation ······················· 16
2. Operation (Starting) ................................ 17
3. Pump stopping ....................................... 17
MAINTENANCE .......................................................................... 18
1. Troubleshooting ······································ 19
2. Maintenance and inspection .................. 21
3. Disassembly and assembly .................... 25
4. Consumable parts .................................. 28
Please contact the IWAKI sales office or IWAKI dealer for any
inquiries or questions regarding this product.

- 1 -
For the Safe and Correct Handling of the Pump
• Before use of the pump, read carefully this "Safety Section" to prevent accidents and to
avoid the damage or loss of other assets.
• Observe and abide by the instructions described in this "Safety Section". These
instructions are very important for protecting pump users or other persons from
hazard or from loss of assets.
• Meaning of symbols
Following two symbols describe the extent of hazards and loss which may brought if the
instructions are not observed or if the pump is wrongly used.
Following two symbols describe the content to be observed.
SAFETY SECTION
Warning Nonobservance or misapplication of the contents of the "Warning" could lead to a death or heavy injury of
person.
Caution Nonobservance or misapplication of the contents of the "Caution" could lead to a injury of person or damage of
assets.
Prohibited action or procedure is indicated. Inside or
near this circle, a concrete activity to be prohibited is
depicted.
Action or procedure which must be performed without
fail is indicated. Inside this circle, a concrete activity
to be performed is depicted.

- 2 -
Warning
•Magnet field danger
The magnet drive pumps contain very strong magnets. The strong magnet field
could adversely affect persons who are assisted by electronic devices such as
pacemakers etc.
•Always turn off power supply prior to maintenance works etc. Pay special attention
so that no other operator turns on by mistake the power supply while someone is
working on the pump. In a noisy or poor visibility environment, display a sign near
power supply switch to notify other person that someone is "WORKING" on the
pump. Power supply mistakenly turned on during maintenance works may lead to
personal injury. Each operator must pay special attention.
•Wear protectors
When piping is removed or pump is disassembled/assembled, wear protective gear
such as safety goggles and protective gloves etc.
•Lifting pump
When pump is lifted, apply chain or belt to eye bolt and motor to keep the pump &
motor horizontally.
•No remodeling
Remodeling of pump may result in serious personal injury or damage of the pump.
Do not attempt remodeling pump because it is very dangerous.
Power off
Wear protective
gear
No Remodeling
•Dangerous liquid
When the pump is used to transfer dangerous liquids mentioned as below, the
pump must always be checked and watched so that the liquid can not be leaked.
The operation of pump leaking the liquid may result in personal injury, explosion or
fire accident.
•Explosive or flammable liquids
•Corrosive or stimulus toxic liquids
•Liquids harmful to human health
Safety Section

- 3 -
CAUTION
•Attention to magnetic force
This pump employs strong magnets. Special attention must be paid not to be injured
by attracting force of magnets. Follow the procedure "Disassembling and
Assembling" when the maintenance works are done.
•Do not run pump dry
Do not run pump dry (without liquid). If the pump run dry, heat is generated by
rubbing, which causes pump damage. If the pump is operated with suction side
valve closed, the pump runs dry.
•Countermeasures for static electricity
When low electric conductivity liquid such as ultra-pure water and fluor inactive
liquid (e.g. Fluorinert™ are handled, the static electricity may be generated in the
pump, which may cause static discharge and pump break down. Take
countermeasures to avoid and remove the static electricity.
•Qualified operator
The pump must be handled or operated by the person who has enough knowledge
and well acquainted with the pump.
•For specified application only
The use of pump in any application other than those clearly specified may result in
the failure or damage of the pump.
Do not run dry
•Disposal of used pump
Disposal of used or damaged pump must be done in accordance with local laws and
regulations. (Consult a licensed industrial waste products disposing company.)
•Ventilate the site
When handling the liquid which may generate toxic gas, safety measures such as
ventilation must be taken to prepare for the accidental liquid leakage.
•Countermeasure to liquid flowing out
Protective measurement must be taken against liquid flowing out caused by
damage of pump or pipe by accident. Also, appropriate measurement must be taken
so that the liquid can not directly flow out on the ground.
Safety Section
•Eliminate air in pump chamber
Before full operation of pump, run pump to eliminate air from pump chamber.
Above all when pumping liquid which easily generates bubbles (hydrogen peroxide,
sodium hypochlorite or so), eliminate air every time when pump is operated.
Operation of pump with air remaining in pump chamber may heat rubbing parts of
pump resulting in pump damage.

- 4 -
OUTLINE OF PRODUCT
1. Unpacking and inspection.................. 5
2. Description on body and label............ 5
3. Model code ........................................ 6
4. Names of parts................................... 8

- 5 -
1. Unpacking and inspection
Iwaki Magnet Pump
MODEL
HEAD
CAPACITY
MFG.No.
(m)
(r/min)
IWAKI CO.,LTD.
TOKYO
JAPAN
2P403846
1
kW Hz rpm
After unpacking, check the following points to confirm that
the delivered product and its accompanying parts and
elements are exactly what you ordered.
[1] Do the model and frequency indicated on the nameplate
conform to your order?
[2] Prior to the installation of the MDF-LMKK pump
(using SiC liner ring and mouth ring), remove the
cardboard pad inserted inside the suction port.
[3] Has the pump unit or any part of it been damaged or
bolts and nuts been loosened during delivery?
2. Description on body and label
Pump unit (liquid feeding section)
No self priming: Before operating the pump,
feed liquid through the suction
or dischargeside port.
Motor nameplate
Use only the power voltage specified on the
nameplate. (Follow applicable local power
regulations.)
"Rotation" indicator label
The arrow indicates the rotating
direction of the motor.
Always make sure that the motor
runs in the direction the arrow
indicates. (Refer to chapter
"Operation".)
Motor (Driver)
This motor provides power to the
pump unit.
Base
Pump should be fixed firmly.
Discharge port
Suction port
Drain port
Drain the discharged liquid into a
suitable container and follow the
applicable local regulations in
disposing of the liquid. Never
allow the discharged liquid to
flow directly onto the ground. "Never Run Pump Dry" label
Operating the pump without liquid will cause damage inside the
pump. Never operate the pump without liquid. (Refer to pump
model code u.)
CAUTION
When cleaning the pump, do not wipe the labels or the pump body with
solvent.
Pump specification nameplate
Pump must be operated according to
the specified conditions.

- 6 -
3. Model code
Example:
MDF-L 42 5 CF V T - D H1
qwertyui
qSeries MDF-L Type Series
wNominal bore size Suction ×Dischage (mm)
25 : 25 ×25
40 : 40 ×40
42 : 50 ×40
eMotor output 0: 0.37 kW 1: 0.75 kW 2: 1.5 kW 3: 2.2 kW
5: 4 kW
rMaterial of bearing/spindle CF: High density carbon/Alumina ceramics 99.5%
AA: Alumina ceramics 99.5%/Alumina ceramics 99.5%
KK: SiC/SiC
tMaterial of O ring and gasket V: FKM E: EPDM A: AFLAS®
FKM, AFLAS®: Fluoro rubber
EPDM: Ethylene propylene rubber
yCode of impeller T, V, W: Standard
K, L: For high head applications
uConstruction code D: Pump can run dry for max. one hour.
E: Pump can not run dry.
iHigh temp/
High pressure version
No code: Standard
H: For high liquid temperature
(Max. 100 deg. C for 250/401)
H1: For high allowable pressure
(Max. 0.5MPa for 42 model)

- 7 -
Operating condition of pump
[1] Allowable pressure
Graphs below show maximum pressure resistance of pump. Pump discharge pressure should not exceed the
max. allowable pressure.
[2] Slurries containing liquid
Liquid containing slurries can not be pumped as a general rule, however the pump with SiC bearing (KK type)
can handle liquid containing slurries max. 5% concentration, particle size max. 50 µ and hardness max. 80Hs.
Consult us in advance when you wish to handle liquid containing slurries.
[3] Specific gravity and viscosity of pumped liquid influence pump performance
Shaft power, discharge capacity and head are influenced by specific gravity and viscosity of pumped liquid.
Pump is manufactured based on the information of specification and operating condition given to us when
ordered. If the informed specification and condition will be changed, ask us for the possibility of usage before
you use the pump.
[4] Influence by temperature
Pump itself is not influenced by temperature change but pumped liquid changes its viscosity, vapor pressure,
chemical corrosion characteristics etc. according to the change of temperature. Therefore enough attention
should be paid to the change of temperature of pumped liquid.
MDF-L401
0.3
0.24
0 90 100
High temp. type (H) High temp. type (H)
Temp
(deg. C) Temp (deg. C
Max. allowable press. (MPa)
MDF-L250
MDF-L425
0.3
0.16
0 90 100
0.5
0.45
0 100
MDF-L422, 423
0.5
0.4
0 100
Standard type
Max. allowable press. (MPa)
Standard type
High allow. press. type (HI)
Temp
(deg. C
Max. allowable press. (MPa)
Standard type
High allow. press. type (HI)
Temp
(deg. C)
Max. allowable press. (MPa)
Standard type
Ambient temp: 0~40 deg. C
Ambient humidity: 35~85%RH

- 8 -
4. Names of parts
■Names of Parts
• MDF-L250 and 401
No.
1
2
3
5
7
8
9
11
12
13
15
16
17
No.
18
19
20
21
22
23
24
25
26
Q'ty
1
1
1
1
1
1
2
1
1
1
2
Parts name Material
M8×65, WITH SW, Q'TY5
FERRITE MAGNET+ALUMINUM ALLOY
STNLS STL
FC200
CFRETFE
PTFE
CFRETFE
M8×35, WITH SW, Q'TY1 M8×70, WITH SW, Q'TY5
M8×40, WITH SW, Q'TY3
Model 250 Model 401
Remarks
Front casing
Rear casing
Impeller
Drive magnet unit
Hex. head bolt
Hex. head bolt
Foot support
Cover A
Cover C
Cover B
Magnet capsule
Motor
Cap
Q'ty
Parts name Remarks
JIS B 2401
G 135
Only "H" type
Material
CF-D AA-E KK-ECC-ECA-D
PTFE
V: FKM E: EPDM A: AFLAS
Steel
STNLS STL
Alumina
ceramics 95% Alumina ceramics 99.5% SiC
®
1
1
1
1
1
1
2
1
1
Liner ring
High density carbon
Impeller thrust
Spindle
Bearing
Mouth ring
O ring
Gasket
Eye bolt
Rear casing cover
JIS B 2401
G 160
Only model 401
16 132
25
911
1
12
22
18
3
17
24
23
19
15
21520
26
87

- 9 -
• MDF-L422, 423 and 425
Drawing shows standard type
No.
1
2
3
5
7
8
9
11
12
13
15
No.
18
19
20
21
22
23
24
25
26
Q'ty
1
1
1
5
1
1
1
2
1
1
Parts name Material
M10 × 40 WITH SW
RARE EARTH MAGNET+FCD450
FC200
CFRETFE
CFRETFE
M10 × 75 WITH SW
Front casing
Rear casing
Impeller
Drive magnet unit
Hex. socket head bolt
Hex. socket head bolt
Foot support
Cover A
Cover C
Cover B
Magnet capsule
Motor
Cap
Q'ty
Parts name Remarks
JIS B 2401 G 165
For H1 type
For standard type
Material KK-EAA-ECF-D
PTFE
Steel
STNLS STL
High density
carbon
Alumina ceramics 99.5% SiC
1
1
1
1
1
1
2
1
1
Liner ring
Impeller thrust
Spindle
Bearing
Mouth ring
O ring
Gasket
Eye bolt
Rear casing cover
29 1
Retainer ring
PTFE
16
17
1
1
2
STNLS STL
Remarks
V: FKM E: EPDM A: AFLAS®
7
23
24
17
3
18
22
12
1
205 211519
16 925 211
13
29
8

- 10 -
1. Installation
................................................
11
2. Piping
........................................................
12
3. Electrical wiring
.......................................
14
INSTALLATION

- 11 -
1. Installation
Example of recommended piping
qDischarge pipe
wDischarge valve
eCheck valve
rPressure gauge
tMotor
yPump
uFlexible joint
iVacuum gauge
oSuction pipe
!0 Suction valve
!1 Gate valve
!2 Air vent piping
!3 Pipe support
1. Installed position
•Install and fix the pump on the foundation which is not affected by vibration generated by other machines.
•Keep enough space around the pump for the back pull-out of motor, assembly and disassembly of the pump.
•Foundation area must be larger than pump base plate.
2. Location
•Install the pump as close to the tank as possible and at lower position than the tank (flooded suction).
•If the pump is installed at the location that the pump suction port comes higher position than the liquid level
of tank (suction lift style), install the priming piping and foot valve at the end.
3. Foundation
•Refer to illustration below.
1
2
3
11
10
13
10
12
11
65
97
4
87
12
Within
1m
Concrete foundation
Foundation bolt
Baseplate liner

- 12 -
2. Piping
1.Tightening of pipe flange
Table below shows the bolt size and tightening torque for the connection of pipe flange to pump flange. Tightening
torque is the figure when metallic flange and rubber gasket are used.
2.Pipe load and moment
Pipe load and moment put on the pump should not exceed the figures shown below.
Pump model
MDF-L401, 422, 423, 425
Tightening torque
79 N ⋅ m
Z
X
Y
X
ZY
Allowable pipe load on pump flange
Direction of load Suction flange
Fx
Fy (Pression/Tension) 0.58
Fz 0.71
Load kN
Discharge flange
0.71 0.89
0.58
0.89/0.44
Allowable moment on pump flange
Direction of load Suction flange
Mx
My 0.35
Mz 0.23
Moment kN ⋅ m
Discharge flange
0.35 0.46
0.23
0.46
MDF-L250 42 N ⋅ m
Bolt size
M12
M16

- 13 -
3.Suction piping
(1)Flooded suction
Flooded suction is recommended.
(2)Pipe diameter
Pipe diameter should be larger than pump inlet bore.
(3)Shortest piping
Employ less bends and shortest piping length.
(4)Straight piping
Employ straight pipe just before pump inlet port.
Pump inlet bore 50A or smaller : Straight pipe of 500 mm or longer
Pump inlet bore 65A or larger : Straight pipe of 8 times as larger than inlet port
For the easy pump dismantling and maintenance, install a removable short length pipe of 300mm or so in straight
piping.
(5)Air pocket in piping
Do not allow any projection in piping where air may be trapped along the suction pipe.
Suction pipe should have an ascending gradient of 1/100 toward the pump.
(6)Different diameter of pipes
If diameter of pump suction port is different from that of suction pipe, use the eccentric reducer pipe. Connect the
eccentric reducer pipe so that upper side is level. Residual air may not go out if it is mounted in reverse.
(7)Gate valve in suction side
In case of flooded suction, install gate valve in suction piping. It is needed when the pump is disassembled and
inspected.
(8)Piping for flushing
Install pump flushing piping in case that the dangerous liquid will be handled.
(9)End of suction piping
The end of suction pipe always should be located 500 mm or more below the liquid level. Take care so that air can
not be sucked in suction piping.
(10)In case of suction lift piping
•The end of suction piping should be 1 to 1.5 times of pipe diameter or more away from the bottom of suction
tank.
•Install foot valve or check valve in suction piping.
(11)Pipe support
Install the pipe support so that the weight of pipe can not be directly loaded to the pump.
(12)Pipe connection
Pipes must be connected securely so that the air can not be sucked in. If the sealing is not perfect, air is sucked in,
which causes pump damage.

- 14 -
4. Discharge piping
(1)Pipe diameter
In case the discharge piping is long, the specified performance may not be obtained because of unexpected pipe
resistance if the pipe diameter is the same as pump bore. Calculate the pipe resistance in advance to decide proper
diameter of pipe.
(2)Position of the first valve
Take 1m or so distance between pump and the valve located the nearest to pump and install air eliminating piping
at the place close to the nearest valve to the pump so that air can not remain in pump. Refer to “Example of recom-
mended piping” on page 10.
(3)Gate valve
Install the gate valve in discharge piping to adjust flow rate and to protect motor from over loading. If the check
valve is also installed, recommended arrangement is : Pump /Check valve /Gate valve
(4)Pressure gauge
Install a pressure gauge in discharge piping to check the operating conditions such as discharge head etc.
(5)Check valve
Check valve must be installed in the following cases.
•Discharge piping is longer than 15 to 20 meters.
•Actual head exceeds 15 meters.
•Height difference between liquid level and discharge pipe end exceeds 9 meters.
•When two pumps are used in parallel.
(6)Air vent
If horizontal discharge piping is longer than 15 to 20 meters, install air vent on the way.
(7)Drain
If the liquid must be drained to protect from freezing, install the drain valve.
(8)Pipe support
Install the pipe support so that the pipe weight can not be loaded to pump.
(9)Priming piping
Install piping for priming in case of suction lift.
3. Electrical wiring
Electrical works or wiring must be carried out by qualified and authorized person according to local law or regulation.
•Use the electromagnetic switch which conforms to motor specifications such as voltage and capacity etc.
•If pump is installed outdoor, wiring must be done so that water can not get into switch.
•Electromagnetic switch and push-button switch must securely installed apart from the pump.

- 15 -
1. Precautions on operation
.....................
16
2. Operation (Starting)
...............................
17
3. Pump stopping
........................................
17
OPERATION

- 16 -
1. Precautions on operation
CAUTION
•Never operate pump dry or with suction side valve closed.
•Dry running possible model (D type of carbon bearing) can run dry (completely no liquid in pump)
continuously one hour max. However rubbing parts are worn in a short time which will result in pump
damage in the worst case if pump runs dry continuously exceeding one hour or if it runs dry repeatedly
although it is short time.
•After the pump ran dry, leave the pump one hour or more for cooling down to start it once again. If the
liquid flows into the pump just after the pump ran dry, ceramic parts are cracked due to heat shock.
•Check the direction of rotation of pump. Clockwise seen from motor fan is correct direction. If operated
in reverse, pump may be damaged.
•Stop the pump within one minute if it is operated in cavitation.
•Do not run pump with air sucking in.
•If magnet coupling is disconnected, pump can not transfer liquid. Stop pump within a minute and settle
the cause of disconnection before pump is started again.
•Intermittent operation
Frequent repetition of stop/start is not recommended. Stop/start repetition must be limited to six times
an hour. Frequent stop/run more than six times an hour may cause accelerated damage of parts and
lowered durability.
•Temperature change at starting, stopping and operating of pump must be within 80 deg. C.
•Fully close the discharge valve when pump is started to avoid water hammer.
•If the pump is operated with discharge valve closed for a long time, the liquid temperature inside the
pump rises, which may cause pump damage. Do not run the pump for more than one minute with
discharge valve closed.
•If power is interrupted while pump is running, switch off pump and close discharge valve.
•Pay attention so that discharge pressure can not exceed pump allowable pressure.
•Observe the allowable minimum flow rate. If the pump is operated below the allowable minimum flow
rate, bearing or rubbing parts may be seizured due to lack of lubrication and cooling.
Allowable min. flow rate MDF-L250, 401 : 10 L/min.
MDF-L422, 423 : 20 L/min.
MDF-L425 : 50 L/min.
•When high temperature liquid is transferred, pump surface becomes very hot. Take protective measure
against burn.
Liquid temp. Max. pump surface temp. (Amb. temp. 40 deg. C)
90 deg. C 80 deg. C
100 deg. C 90 deg. C
•Pump noise
MDF-L250: 75dB
MDF-L401, 422, 423, 425: 80dB

- 17 -
2. Operation (Starting)
1. Fully close discharge valve and fully open suction valve.
2. Fill liquid into pump
•In case of flooded suction, confirm if suction valve is fully opened.
•In case of suction lift, prime to fill liquid into suction piping.
3. Check rotating direction of motor.
•Start motor momentarily (within a second) to check direction. Direction is shown on "arrow" mark on pump.
(Clockwise seen from motor fan side)
•Also check if motor fan smoothly stops when switched off. If it does not stop smoothly, pump rotating parts may
be locked. Check the rotating parts.
4. Air vent operation
•Before pump operation, vent the air in the pump.
•Fully open the valve in air vent piping and repeat one second running for three to five times.
•After the air vent running, fully close the discharge valve.
Note: In case air vent piping is not equipped, open the discharge valve to repeat momentary run several
times.
5. Starting pump
•Start pump with discharge valve fully closed. (Maximum one minute)
•Confirm that discharge pressure rises to shut-down pressure.
•Gradually open discharge valve to get specified pressure (capacity).
Note: Pay attention to over-load caused by excessively opened valve.
Keep minimum allowable capacity to avoid seizure of bearing or rubbing parts.
3. Pump stopping
1. Slowly close the discharge valve
Quick closing of valve may cause water hammer and pump damage.
2. Switch off and stop the pump
Confirm if pump stops smoothly. If pump stops suddenly and not smoothly, inspection is needed.
3. When the pump is stopped for a long period, anti freezing measure must be taken so that the liquid can not be frozen
in the pump or piping.
Model
MDF-L422,423
Min. flow
20L/min
MDF-L425 50L/min
MDF-L250, 401 10L/min

- 18 -
1. Troubleshooting
......................................
19
2. Maintenance & inspection
....................
21
3. Disassembling & assembling
..............
25
4. Consumable parts
..................................
28
Maintenance