IWAKI PUMPS MDM Series User manual

IWAKI Magnetic Drive Pump
MDM Series (Long coupling type)
Instruction Manual
Read this manual before use of product
This is patent pending product.

Thank you for selecting IWAKI Magnetic Drive Pump MDM Series.
This instruction manual, which is divided into five sections, name-
ly "Safety", "Outline of Product", "Installation", "Operation" and
"Maintenance", deals with the correct handling and operation procedures
for the pump. To make maximum use of the pump and to ensure safe and
long time operation of the pump, please read this manual thoroughly and
carefully prior to operating the pump.
Contents
SAFETY SECTION .......................................................................... 1
OUTLINE OF PRODUCT ................................................................. 4
1. Unpacking and inspection ........................................... 5
2. Model code ................................................................. 6
3. Conditions to be used ................................................. 7
4. Structure and names of parts ..................................... 8
INSTALLATION ................................................................................ 9
5. Installation..................................................................10
6. Piping.........................................................................11
7. Electrical wiring ..........................................................13
8. Protection...................................................................13
OPER ATION ...................................................................................14
9. Precautions on operation ...........................................15
10. Operation...................................................................16
11. Pump stopping ...........................................................16
MAINTENANCE ..............................................................................17
12. Troubleshooting .........................................................18
13. Maintenance & inspection......................................... 20
14. Disassembling & assembling .................................... 23
15. Repair parts list..........................................................31
EC DECLARATION OF CONFORMITY ......................................... 36
Information on CE conformity ..........................................................37

- 1 -
Safety Section
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.
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 dam-
age 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 with-
out fail is indicated. Inside this circle, a concrete
activity to be performed is depicted.
Export Restrictions
Technical information contained in this instruction manual might be treated as con-
trolled technology in your countries, due to agreements in international regime for
export control.
Please be reminded that export license/permission could be required when this manu-
al is provided, due to export control regulations of your country.
For Use of Our ATEX-Certifed Models in Explosive Environments
Use the attached additional instructions as well as this standard manual.

- 2 -
Safety Section
● Access limitation
The magnet drive pump has a pair of strong magnets (the magnet capsule
unit and drive magnet). The strong magnet field could adversely affect the
persons who are assisted by electronic devices such as the pacemaker.
● Turn off power before work
Be sure to turn off power to stop the pump and related devices before work.
Make sure no one turns on power by mistake while working on the pump,
otherwise it may result in a serious accident. If your working area is noisy or
dark, let other people know about the situation by displaying a notice such
as "POWER OFF (Maintenance)" near a power switch.
● Wear protective clothing
Always wear protective clothing such as an eye protection, chemical resist-
ant gloves, a mask and a face shield during disassembly, assembly or main-
tenance work.
● Use the eye bolt or lifting holes
Use the eye bolt when lifting the pump unit only or use lifting holes on the
base if the pump unit is mounted on it. In the latter case, do not use the eye
bolt. Use an overhead crane or any other proper transporting machine. Two
or more operators may be needed for ensuring safe transport depending on
the pump size and weight.
● Do not modify the pump
Alterations to the pump carries a high degree of risk. It is not the manufactur-
er’s responsibility for any failure or injury resulting from alterations to the pump.
● When handling harmful liquid
When a harmful liquid as mentioned below is used, be sure to conduct daily
inspection and maintenance for the prevention of liquid/gas leakage.
1. Explosive or flammable liquid
2. Corrosive chemicals
3. Harmful liquid or gas
● Ventilation
Fumes or vapours can be hazardous with certain solutions. Ensure proper
ventilation at the operation site.
Turning off power
WARNING
Wear
protectors
Prohibition
Do not remodel

- 3 -
Safety Section
CAUTION
● Do not catch the finger
Magnetic force of the pump is powerful. Take care not to catch the finger in
the bracket. Observe the instructions on the later pages for disassembly and
assembly.
● Do not run pump dry
Do not run pump dry (operation without priming water or with a suction valve
closed). Internal parts are excessively worn by friction heat and fatal pump
damage results.
● Qualified personnel only
The pump should be handled or operated by qualified personnel with a full
understanding of the pump. Any person not familiar with the product should
not take part in the operation or management of the pump.
● Do not use the pump/motor in any condition other than its intended purpose
The use of the pump/motor in any conditions other than those clearly specied
may result in failure or injury. Use this product in specied conditions only.
● Static electricity
When low electric conductivity liquids such as ultra-pure water and fluor inac-
tive liquid (e.g. FluorinertTM) are handled, static electricity may generate in
the pump and may cause static discharge. Take countermeasures to remove
static electricity.
● Commissioning
Friction heat builds up and damages the internal parts. Break in the pump to
expel gas from the pump and piping, especially when handling liquids that
generate gas bubbles (sodium hypochlorite or hydrogen peroxide).
●Spill precautions
Ensure protection and containment of solution in the event of plumbing or
pump damage (secondary containment).
●Disposal of a used pump
Remove a chemical and ush it out before the pump is disconnected from
piping. Dispose of any used or damaged pump in accordance with local rules
and regulations. If necessary, consult a licensed industrial waste disposal
company.
Prohibition
Prohibition

- 4 -
1. Unpacking and inspection ........................5
2. Model code ..................................................6
3. Conditions to be used ...............................7
4. Structure and names of parts..................8
OUTLINE OF PRODUCT

- 5 -
After unpacking of the pump, check the following
points.
(1) If the product is ordered one.
Check model code, discharge capacity, discharge
pressure, voltage which are written on nameplate
of pump and motor to see if they conform to your
order.
(2) If the product is not damaged or bolts are not loos-
ened during transportation. Tighten especially the
bolts which are holding a rear casing support to
the specific tightening torque subsequent to the
first tightening. Refer to the "13. Disassembling &
assembling" for the specific torque value.
(3) If accessories are attached.
Standard accessories:
Bolts for back pull-out M12 × 90: 2pcs
Optional accessories if ordered.
1. Unpacking and inspection
Eye bolt
Motor nameplate
Bracket
Pump nameplate
Baseplate
Suction port
Discharge port
*The CE marking on our product(s) is for us to market
the product(s) into the European market, however, the
CE marking does not ensure any safety or conformity
of the product(s) outside the European market.
When the pump is incorporated into the equipment
marketed in the European market, such equipment
must meet all the requirements of applicable directives.
In such a case, any person who places the equipment
on the market must carry a CE mark on the equipment
as a manufacturer.

- 6 -
MDM 80-50-160 P KK C 075 I - D 2 H
Pump sizes Suction Discharge Nominal impeller diameter
50 × 32 160/200
65 × 40 160
80 × 50 160
Casing material P: PFA
Bearing/spindle material KK: SiC/SiC
Type of motor to be mounted C: Foot mounted motor type
Motor output
022: 2.2 kW, 040: 4.0 kW, 055: 5.5 kW,
075: 7.5 kW, 110: 11 kW, 150: 15kW
Standard for connection flange/motor
I: ISO pump flange + IEC motor
Drain/special version
2. Model code
Baseplate Standard or Special version
A
With baseplate
Standard
S
D
XSpecial version
B
Without baseplate
Standard
Y
E
Z
Drain
Without drain Special version
With drain Standard
Without drain Special version
With drain Standard
Special version
Note: For PFA material type, air vent is always equipped for "with drain" type.
Motor pole 2 : 2 pole motor
4 : 4 pole motor
High temperature type: No code : Standard
H : High temperature type (80 to 120 deg.C)
T : High temperature type (120 to 150 deg.C)
Note: See the nameplate for the actual impeller outer diameter.

- 7 -
1. Permissible pressure
Permissible pressure of the pump is 1.6 MPa. Pay attention so that the pump discharge pressure does not exceed this
figure.
2. Slurry containing liquid
Basically slurry containing liquid can not be handled but SiC bearing type (KK type) can handle it in the following
conditions:
• Slurry concentration up to 5 wt%
• Slurry hardness up to 80 Hs
• Slurry size up to 50 µm
3. Performance change caused by specific gravity and viscosity of liquid
When specific gravity and viscosity are larger than water, shaft power, discharge capacity and discharge head will
change depending on specific gravity and viscosity of pumped liquid. The pump was made and shipped according
to the information given to IWAKI. If the liquid condition is changed, ask and confirm IWAKI to use the pump
without problem.
4. Influence by liquid temperature
The chemical liquid changes its viscosity, vapour pressure and corrosively according to the temperature change.
Pay attention to the change of liquid characteristics.
3. Conditions to be used
Note: For liquid temperature below zero deg. C and above 120 deg. C, please contact IWAKI because
detailed operating condition must be considered for these temperature ranges.
Ambient temperature range: 0 - 40 deg. C
Ambient humidity range: 35 - 85% RH
Liquid temperature range
-20 0 80 120 150
Pumped liquid
temperature (deg. C)
PFA material (All models) H type T type

- 8 -
4. Structure and names of parts
Note 1: Q'ty in parentheses (10) is for MDM50-32-200 & MDM80-50-160.
2: H type and T type have different structure in a part of the component parts. Refer to the dimension
of H type and T type for further information.
NO. Parts name Q'ty NO. Parts name Q'ty
500.3 Plain washer 2
551 Wave washer 1
5 5 4.1 Spring washer 2
554.3 Spring washer 2
554.4 Spring washer
554.5 Spring washer 4
554.6 Spring washer 4
321.2 Ball bearing 1
330 Bracket 1
350 Bearing housing 1
360 Bearing cover 1
40 0.1 Gasket, casing 1
400.2 Gasket, drain 1
400.3 Gasket, air vent 1
8(10)
420 350
901.6 903.2 940.1 908.1
159 158 900
901.5
858 161 400.1 942 230
100.1
122.2
901.3
400.3
314.2
314.1
210
122.1
901.1
400.2
310
859
330
314.4314.3
360
321.1 213
554.5
554.6
554.3 500.3
554.1 500.1
901.8
321.2
551
554.8
901.4
554.4
183
100.1 Front casing 1
12 2.1 Drain plate 1
122.2 Air vent plate 1
158 Rear casing 1
159 Rear casing cover 1
161 Rear casing support 1
183 Support 1
210 Spindle 1
213 Drive shaft 1
230 Impeller 1
310 Bearing 1
314.1 Liner ring 1
314.2 Mouth ring 1
314.3 Rear thrust ring 1
314.4 Rear ring 1
321.1 Ball bearing 1
554.8 Spring washer 2
858 Drive magnet unit 1
859 Magnet capsule unit 1
900 Eye bolt 1
9 01.1 Hex. head bolt 2
901.3 Hex. head bolt 2
901.4 Hex. head bolt 8(10)
901.5 Hex. head bolt 4
901.6 Hex. head bolt 4
901.8 Hex. head bolt 2
903.2 Hex. soch head bolt 6
9 0 8.1 Hex. soch set screw 2
940.1 Key 1
942 Pin impeller 2
420 Shaft seal 1
50 0.1 Plain washer 2

- 9 -
5. Installation..................................................10
6. Piping ..........................................................11
7. Electrical wiring.........................................13
8. Protection ...................................................13
INSTALL ATION

- 10 -
5. Installation
Example of recommended piping
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
6
5
97
4
87
12
Within
1m
Concrete foundation
Foundation bolt
Baseplate liner
Discharge pipe
Discharge valve
Check valve
Pressure gauge
Motor
Pump
Flexible joint
Vacuum gauge
Suction pipe
Suction valve
Gate valve
Air vent piping
Pipe support

- 11 -
6. 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.
Bolt size
M16
Tightening torque
78.4 N ⋅ m
Z
X
Y
X
Z
Y
Allowable pipe load on pump flange
Direction of load
Load kN
Discharge ange Suction ange
MDM50-32-160
MDM50-32-200
MDM65-40-160
MDM80-50-160
MDM50-32-160
MDM50-32-200
MDM65-40-160
MDM80-50-160
Fx 0.71 1.07 0.89 1.33
Fy (Pression/Tension) 0.89/0.44 1.33/0.67 0.58 0.89
Fz 0.58 0.89 0.71 1.07
Allowable moment on pump flange
Direction of load
Load kN⋅m
Discharge ange Suction ange
MDM50-32-160
MDM50-32-200
MDM65-40-160
MDM80-50-160
MDM50-32-160
MDM50-32-200
MDM65-40-160
MDM80-50-160
Mx 0.35 0.72 0.46 0.95
My 0.46 0.95 0.35 0.72
Mz 0.23 0.47 0.23 0.47

- 12 -
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.
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.

- 13 -
(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.
7. 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.
• Star-delta starter, inverter or soft starter is recommended to start the motor of 5.5 kW or more power which drives the pump.
* See the instruction manual of the motor manufacturer for the handling of the motor.
It is recommended to install the following monitoring devices to protect the pump.
1. Current sensor/Power sensor The sensors monitor the motor load and stop the pump on the detection of load change.
2. Pressure sensor The sensor monitors the starting pressure and stops the pump on the detection of
pressure change.
3. Flow sensor The sensor monitors the discharge flow and stops the pump on the detection of
flow change.
4. Level sensor The sensor monitors the liquid level and stops the pump when it falls below the
specified level.
It is recommended to install two or more monitoring devices. The more monitoring devices are installed, the more
possibility of protecting the pump.
The DRN series pump protector (an electric current sensing type abnormal operation preventive device) is also avail-
able as an option. Contact us for detail.
8. Protection

- 14 -
9. Precautions on operation........................15
10. Operation (Starting) .................................16
11. Pump stopping..........................................16
OPERATION

- 15 -
9. Precautions on operation
CAUTION
● Never operate pump dry or with suction side valve closed.
● Do not run pump dry (operation without priming water or with a suction valve closed). Otherwise, inter-
nal parts are excessively worn by friction heat and fatal pump damage results.
* If the pump runs dry by mistake, turn off power and leave it for more than one hour to cool it down.
Quick cooling can give rise to cracks on parts.
* An Iwaki dry run protector, the DR, is recommended for the prevention of dry running.
● 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 dis-
charge 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 of 1 MPa.
Check that there is no looseness on each bolt before operating pump. Tighten especially the bolts
which are holding a rear casing support to the specific tightening torque subsequent to the first tighten-
ing. Refer to the "13. Disassembling & assembling" for the specific torque value.
● 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 All pump sizes : 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)
100 deg. C 90 deg. C
120 deg. C 110 deg. C
150 deg. C 135 deg. C
● Pump noise
85 dB(A) for MDM50-32-160, MDM65-40-160
95 dB(A) for MDM50-32-200, MDM80-50-160

- 16 -
10. 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.
11. 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.
2P 4P
All pump sizes 50 l/min 20 l/min

- 17 -
12. Troubleshooting ........................................18
13. Maintenance & inspection ..................... 20
14. Disassembling & assembling.................23
15. Repair parts list.........................................31
MAINTENANCE

- 18 -
12. Troubleshooting
Troubles
Liquid can not
be sucked
•Lack of priming
liquid
•Dry running
•Foot valve is
clogged by foreign
matters.
•Stop pump and replen-
ish pump with liquid to
re-start.
Primed liquid drops
quickly
•Clean foot valve
•Check if foreign mat-
ters are not adhered to
valve seat.
When disch. valve
closed
After starting, pres-
sure drops as soon
as discharge valve is
opened.
•Air is sucked from
suction pipe or
gasket.
•Check if connected
flanges are completely
sealed.
•Check if liquid level of
tank is not excessively
lowered.
•Disconnected mag-
net coupling •Check amperage to
see if motor is not over-
loaded.
•Check if foreign matters
do not lock impeller or
magnet capsule
•Check if voltage is nor-
mal.
Press. gauge shows
low pressure
•Low pump speed
•Reverse rotation
•Check wiring or motor.
•Interchange wiring con-
nection.
Discharge
capacity is
small.
Pressure gauge &
vacuum gauge indi-
cates normal figure.
•Strainer is clogged
by foreign matters.
•Remove foreign mat-
ters.
•Air pocket in suc-
tion piping
•Check and remedy suc-
tion piping.
•Foreign matters
are clogged at
impeller inlet.
•Remove foreign mat-
ters.
•Air is sucked in
from suction pipe or
gasket.
•Check connection part
of pipes and retighten
it.
•Foreign matters
clog at discharge
side.
•Remove foreign mat-
ters.
•Remove foreign mat-
ters or scales in piping.
Symptom on pump
Cause Check & countermeas-
ures
When disch. valve
opened
Press. gauge & vac-
uum gauge indicate
zero.
Pressure gauge
vibrates and drops to
zero.
Vacuum gauge indi-
cates high figure.
Vacuum gauge
indicates very high
figure.
Pressure gauge
& vacuum gauge
vibrate.
Vacuum gauge indi-
cates high but pres-
sure gauge indicates
normal.
•There are resist-
ance such as air
pocket etc. in suc-
tion piping.
•Check if there is not
protruded section in
suction piping.