Richter MNKA Series User manual

INSTALLATION AND OPERATING MANUAL
Translation of the original manual
Keep for future use!
This operating manual must be strictly observed before
transport, installation, operation and maintenance
Subject to change without notice.
Reproduction is generally permitted with indication of the source.
©Richter Chemie-Technik GmbH
9250-050-en Revision 11 Edition 07/2010
Series MNKA acc. to ASME
Sealless Chemical
Magnetic Drive Pump
Bearing lubrication: Long life grease and
oil bath
Bearing pedestal group: 1 and 2

Series MNKA, acc. to ASME Page 2
9250-050-en Revision 11
TM 7903 Edition 07/2010
List of Contents
List of Contents ........................................2
Relevant documents.................................3
1Technical data......................................3
1.1Tightening torques.......................................4
1.2Name plate, dry-running, ATEX and housing
(casing) markings........................................4
1.3Spare parts..................................................4
2Notes on safety....................................5
2.1Intended use................................................5
2.2For the customer/operator...........................6
2.3For maintenance .........................................6
2.4Conversion work and production of spare
parts by the customer..................................6
2.5Inadmissible modes of operation ................6
2.6Special requirements for explosion protection
6

2.6.1Filling the unit...................................................6
2.6.2Special operating conditions............................6
2.6.3Chargeable liquids ...........................................7
2.6.4Identification.....................................................7
2.6.5Check of the direction of rotation .....................7
2.6.6Mode of operation of the pump ........................7
2.6.7Temperature limits ...........................................7
2.6.8Maintenance.....................................................8
2.6.9Electric peripheral equipment...........................8
3Transport and storage.........................9
3.1Return consignments ..................................9
3.2Disposal.......................................................9
4Product description...........................10
5Installation..........................................10
5.1Safety regulations......................................10
5.2Installation of pump/unit ............................10
5.3Alignment of pump-coupling-motor...........10
5.4Piping.........................................................11
5.4.1Nominal size...................................................11
5.4.2Nozzle loads...................................................11
5.4.3Suction line.....................................................11
5.4.4Supply lines....................................................11
5.4.5Discharge line ................................................11
5.4.6Venting and draining ......................................12
5.5Pipe fittings................................................12
5.6Monitoring facilities....................................12
5.7Drive..........................................................12
5.8Coupling....................................................13
5.9Final check................................................13
5.10Coupling guard..........................................13
5.11Electric connection....................................13
6Commissioning/Shutdown................14
6.1Initial commissioning................................. 14
6.1.1Filling the pump housing (casing) ..................14
6.1.2Start-up...........................................................14
6.2Operating limits......................................... 14
6.2.1Abrasive media...............................................14
6.2.2Min./max. flow rate.........................................14
6.3Shutdown.................................................. 15
6.4Restarting.................................................. 15
6.5Improper operations and their consequences
(examples) ................................................ 15
7Maintenance.......................................16
7.1Screw connections of the housing (casing)16
7.2Bearing pedestal....................................... 16
7.2.1Grease for life lubrication ...............................16
7.2.2Oil bath lubrication..........................................16
7.3Cleaning.................................................... 16
7.4Stand-by pumps........................................ 16
7.5Notes on dismantling ................................ 17
7.5.1Protective clothing..........................................17
7.5.2Magnetic fields ...............................................17
7.6Dismantling ............................................... 17
7.6.1Removing the bearing pedestal .....................17
7.6.2Dismantling the bearing pedestal, long life
grease lubrication...........................................17
7.6.3Dismantling the bearing pedestal, oil bath
lubrication.......................................................18
7.6.4Dismantling the slide-in unit ...........................18
7.7Notes on assembly ................................... 18
7.8Assembly................................................... 19
7.8.1Assembly of the bearing pedestal, long life
grease lubrication...........................................19
7.8.2Assembly of the bearing pedestal, oil bath
lubrication.......................................................19
7.8.3Drive magnet assembly..................................19
7.8.4Assembly of can unit......................................19
7.8.5Perform trial assembly of the plain bearing
pedestal with impeller, inner magnet assembly
and plain bearings.........................................19
7.8.6Checking bearing play Z and impeller
distance X.......................................................19
7.8.7Final assembly ...............................................20
7.8.8Fill bearing pedestal with oil...........................20
7.9Tests ......................................................... 20
8Faults..................................................21
9Sectional drawing..............................22
9.1Legend...................................................... 22
9.2MNKA with long life grease lubrication..... 23
9.3MNKA with oil bath lubrication................. 24

Series MNKA, acc. to ASME Page 3
9250-050-en Revision 11
TM 7903 Edition 07/2010
Relevant documents
Data sheet
Works certificate
Sectional drawing MNKA long life grease lubrication
Group1 9250-00-3000
Group 2 9250-00-3002
Sectional drawing MNKA oil bath lubrication
Group1 9250-00-3001
Group 2 9250-00-3003
Outline drawing 9250-00-3016
Drawing removing clearance
MNKA, MNKA-B 9250-00-3006
Drain connection 9250-00-3007 *
Shock pulse measurement in the rolling bearing
9250-00-3011*
Plain bearing pedestal with external flushing
connection 9250-00-3008 *
Performance curves
Spare parts list
Operating manual and declaration of conformity
motor *
Operating manual and declaration of conformity
coupling *
*if contained in the scope of delivery
Appendix to the operating instructions
Operational limits 9250-00-3030
Declaration of conformity with ATEX
Declaration of conformity without ATEX
Form for Safety Information Concerning the
Contamination QM 0912-16-2001_en
On request:
Product Manual documents can be sent on
request, e.g. magnet drive data or nozzle forces.
Publication: "Centrifugal Pump Operation without
NSPH Problems".
Publication "Safe Operation of Magnetic Drive
Pumps“.
1Technical data
Manufacturer :
Richter Chemie-Technik GmbH
Otto-Schott-Str. 2
D-47906 Kempen
Telephone: [phone]
Fax: [phone]
E-Mail: [e-mail]
Internet: http://www.richter-ct.com
Authorised person acc. to machinery directive
2006/42/EG:Gregor Kleining
Designation :
Single-stage, plastic-lined, magnetic drive chemical
centrifugal pump, series MNKA, long life grease and
oil bath lubrication
Heavy-duty horizontal design, sealless, free of eddy
currents
Technical specifications and connecting dimensions to
ASME B73.3M table 1, ISO 15783, DIN ISO 5199 and
„Hydraulic Institute Sealless Pump Standards and
referenced standards“
Flange connecting dimensions:
ASME B16.5, class 150
ATEX 95 European Directive 94/9/EC
Machine Directive European 2006/42/EC
Materials :
Pressure-bearing parts:
ductile cast iron ASTM A395 (EN-JS 1049 to DIN EN
1563), carbon fibre composite material
Wetted parts :
PFA, PTFE, SSiC/hard carbon (Option SSiC/SSiC,
SSiC with SAFEGLIDE©PLUS), FFKM
and see data sheet
Flow rate : up to 396 USgpm – 60 Hz
up to 90 m3/h (bei 3500 1/min)
Delivery head : bis 479 ft – 60 Hz
bis 146 m FS (at 3500 rpm)
Housing discharge pressure:
max. 475 psi (19 bar)
detailed data see pressure-temperature diagram
Temperature range:
Standard: - 20 °F to + 300 °F
- 30 °C to + 150 °C
Option: - 20 °F to + 360 °F
- 30 °C to + 180 °C
Drive magnet assembly with magnets
made of samarium-cobalt (SmCo)
Note:Consult the manufacturer for higher pressures
and lower or higher temperatures.
Temperature classes: see Section 2.6.7
Admissible ambient conditions for pumps
acc. to directive 94/9/ EG (ATEX 95) :
Ambient temperature range: 4 °F bis 104 °F
- 20 °C to + 40 °C
(higher temperature after consulting the manufacturer)
Ambient pressure range: 11.6 psia – 16 psia
0,8bar
abs to 1,1bar abs

Series MNKA, acc. to ASME Page 4
9250-050-en Revision 11
TM 7903 Edition 07/2010
Noise capacity level : LWA = Q70 dB acc. to
DIN EN ISO 9614-2
Sizes :
Group 1 Group 2
1.5“ x 1“ x 6“ 3“ x 1.5“ x 8“
3“ x 2“ x 6“ 2“ x 1“ x 10“
1.5“ x 1“ x 8“
Weight : See data sheet
Dimensions :
See installation drawing
1.1 Tighteningtorques
Screws greased, tighten in diametrically opposite
sequence
Housing screws 901/3
Size No. x size Tightening torque
[inch] [DIN/ISO] [Nm] [in-lbs]
1.5“ x 1“ x 6“ 8 x ½“ 35 310
3“ x 2“ x 6“ 8 x ½“ 35 310
1.5“ x 1“ x 8“ 10 x ½“ 35 310
3“ x 1.5“ x 8“ 12 x ½“ 30 265
2“ x 1“ x 10“ 12 x S“45 400
Pipe screws,flanges to ASME
DN No. x size Tightening torque
[inch] [ASME] [Nm] [in-lbs]
1" 4x½“870
1½“ 4 x ½“ 15 135
2" 4xS“25 220
3" 4xS“45 400
1.2 Name plate, dry-running,
ATEX and housing (casing)
markings
The stainless steel name plate is firmly riveted to the
housing (casing):
If the operator attaches his identification, it must be
ensured that the pump matches the application in
question.
Example of name plate:
Dry-running:
ATEX marking:
Housing identification:
The following are visible on the housing according to
DIN EN 19:
Nominal size
Rated pressure
Housing material
Manufacturer's identification
Melt number/Foundry identification
Cast date
1.3 Spareparts
Spare parts for two years of continuous operation in
accordance with DIN 24296 and in consultation with
the manufacturer

Series MNKA, acc. to ASME Page 5
9250-050-en Revision 11
TM 7903 Edition 07/2010
2 Notes on safety
This operating manual contains fundamental
information which is to be observed during installation,
operation and maintenance.
It must be read before installation and
commissioning!
This operating manual must always be available at the
place of use of the machine/plant.
Observe the safety notes in all the chapters.
Installation, operation and maintenance are to be
performed by qualified staff.
The area of responsibility, authority and supervision of
the staff must be exactly regulated by the customer.
If the staff does not have the necessary expertise,
they are to be trained and instructed.
If necessary, this can be provided by the
manufacturer/supplier on behalf of the machine
operator.
General hazard symbol! People may be put
at risk.
Safety symbol! The pump and its function
may be put at risk if this safety symbol is not
observed.
EU marking! Explosion-protected equip-
ment must be identified for work in
potentially explosive areas.
Warning of a magnetic field!
Warning of electric power!
This warning sign must be used if people
with a pacemaker are at risk, e.g. from a
strong magnetic field.
It is imperative to observe signs attached directly to
the pump / unit, e.g.:
Direction of rotation arrow
Warning against dry-running
and they are to be kept legible.
Non-observance of the notes on safety may result
in the loss of any and all claims for damages.
Non-observance may involve the following hazards :
Failure of important functions of the machine/plant.
Failure of electronic equipment and measuring
instruments due to magnetic fields.
Risk to people and their personal property from
magnetic fields.
Risk to people from electric, mechanical and
chemical effects.
Risks to the environment through leaks of
hazardous substances.
If the unit is used in potentially explosive
areas, special attention is to be paid to the
sections identified with “Ex” in this
operating manual.
2.1 Intendeduse
Richter pumps of the series MNKA (ASME) are
sealless, plastic-lined magnetic drive centrifugal
pumps for the leak-free conveyance of aggressive,
toxic, pure and inflammable liquids.
The pump is equipped with a permanent magnetic
synchronous drive.
Vertical installation of the pumps is only possible with
grease-lubricated rolling bearings or rolling bearings
with oil mist lubrication. Please consult the
manufacturer.
The observance of the specified physical
limits is important for perfect functioning and
safe operation, especially with regard to
explosion protection to prevent potential sources of
ignition (see Section 2.6):
It must be ensured that the pump is always filled
with liquid during operation.
For safe pump operation, we recommend a flow
rate which lies between 0.3 and 1.1 Q
opt.The
maximum operating temperature must never be
exceeded. See Section 2.6.7
.In case of doubt,
you must consult the manufacturer.
The manufacturer must be consulted in the event
of entrainment of gas >2% as well as solids in
order to avoid a lack of lubrication and dry-running.
The plant NPSH value (NPSHA) should be 0.5 m
higher than the NPSH value of the pump
(NPSHR). See also Section 5.4.1.
Inadmissible modes of operation, even for a
short period, may result in serious damage to
the unit.
In connection with explosion protection, potential
sources of ignition (overheating, electrostatic and
induced charges, mechanical and electric sparks) may
result from these inadmissible modes of operation;
their occurrence can only be prevented by adhering to
the intended use.
Furthermore, reference is made in this connection to
the European Directive 95/C332/06 (ATEX 118a)
which contains the minimum regulations for improving
the occupational health and safety of the workers who
may be at risk from an explosive atmosphere.
This unit must not be operated above the
values specified in the data sheet as regards
the fluid to be conveyed, flow rate, speed,
density, delivery head and operating temperature as
well as the motor rating.
The instructions contained in the operating
manual or contract documentation must be
observed; if necessary consult the manufacturer.
All important features are documented in the data
sheet included in the scope of delivery.

Series MNKA, acc. to ASME Page 6
9250-050-en Revision 11
TM 7903 Edition 07/2010
In the event of operating conditions other than those
described in the data sheet, the following are to be
checked again:
design of the pump
design of the accessories
suitability of the materials.
2.2 For the customer/operator
The following must be observed:
The notes on safety contained in this operating
manual,
the prevailing regulations on accident prevention,
in-house work, operating and safety regulations of
the customer.
Hot or cold machine parts must be protected by
the customer against being touched.
No protective facilities may be removed when the
machine is in operation.
Hazards due to electricity are to be excluded.
Leaks of hazardous media (e.g. explosive, toxic,
hot) must be removed so that no risk arises for
people and the environment. The statutory
provisions are to be observed.
Caution when using the units in potentially
explosive area! Inadmissible modes of
operation must be prevented.
2.3 Formaintenance
In principle, work on the unit may only be performed
when it is at a standstill.
It is imperative to observe the procedure for stopping
the machine described in this operating manual. See
Section 6.3.
Pumps which convey media which are a health
hazard must be decontaminated.
All safety and protective facilities must be remounted
or enabled immediately after the end of work.
In the assemble state, if the safety notes (see also
Section 5.1 and 7.5.2
)are observed, the magnetic
drives do not cause any risks or have any affect on
the environment.
During dismantling and assembly as well as
during transport and storage of the magnetic
drives as single components, the notes on
safety in Section 7.5.2 must be observed.
The points listed in Section 6.1 must be followed
before recommissioning.
2.4 Conversionworkand
production of spare parts by
the customer
Conversion of or changes to the machine are only
admissible after consultation with the manufacturer.
Original spare parts and accessories authorised by
the manufacturer serve to enhance safety.
The use of other parts may annul the liability for any
resultant consequences.
2.5 Inadmissible modes of
operation
The operational safety of the machine supplied is only
guaranteed if it is used properly in accordance with
Section 2.1 of this operating manual.
The operating limits specified in the data sheet must
under no circumstances be exceeded.
2.6 Specialrequirementsfor
explosion protection
If the units are used in potentially explosive areas, the
measures and notes in Sections 2.6.1 to 2.6.9 are
imperative to guarantee the explosion protection.
2.6.1 Filling the unit
During pump operation the wetted interior of
the pump must always be filled with the fluid.
This prevents any explosive atmosphere and
the risk of dry-running.
If the customer cannot ensure this, we
recommend that appropriate monitoring
facilities be provided.
All auxiliary, heating and cooling systems
must also be carefully filled.
2.6.2 Special operating conditions
In the standard design the can chamber and
the plain bearings are cooled and lubricated
by a flushing flow.
The cooling flow may be interrupted and an
inadmissible rise in temperature may occur due to
properties of the liquid (e.g. sticking, possibly by an
inadmissible ingress of solids, clogging, ingress of gas
etc.). Appropriate monitoring facilities are to be
provided. See Section 5.6.

Series MNKA, acc. to ASME Page 7
9250-050-en Revision 11
TM 7903 Edition 07/2010
For safe pump operation, we recommend a flow rate
of 0.3 to 1.1 Qopt.If the pump is operated outside this
range, it must be ensured that the max. admissible
flow rate according to the pump characteristic curve is
not exceeded and that the max. admissible operating
temperature according to Section 2.6.7 is observed
If the flow rate is too high, the differential pressure
upstream and downstream of the plain bearings could
fall so much that a lack of lubrication or dry-running
may occur.
If the flow rate is too low, the medium may heat up so
much owing to the fluid friction that the max.
admissible surface temperature of the relevant
temperature class is exceeded.
Overloading, overheating, non-observance of the
design data or the incorrect selection of the magnetic
drive can lead to the decoupling of the inner and outer
magnet assemblies. As a result, eddy currents are
induced on the inner and outer magnet assemblies
and an inadmissible rise in temperature may occur.
The situation is to be remedied by providing
appropriate monitoring facilities. See Section 5.6.
The plant NPSH value (NPSHA) should be 1.64ft
(0.5m) higher than the NPSH value of the pump
(NPSHR) to prevent a lack of lubrication or dry-
running of the plain bearings.
2.6.3 Chargeableliquids
For operation with chargeable liquids with a
conductivity < 10
-8 S/m inert gas must be used for
flushing during evacuation if the lining of the pump is
non-conductive. See Section 6.3.
2.6.4 Identification
The identification on the pump relates to the pump
section. A separate declaration of conformity must be
provided for the shaft coupling and motor and for
other attachments as well as corresponding
identification.
Example of the identification of the pump section:
II2GD IIC TX X.
For assembling the pump with components which are
not explosion-protected (e.g. motor, shaft coupling), it
is recommended to mask or remove the "potentially
explosive" identification from the pump component
and, if necessary, from other accessories.
In this case the declaration of conformity applies
without ATEX identification.
At surface temperatures which depend primarily on
operating conditions, DIN EN 13463-1 Chapter 9.3
allows no temperature class or temperature to be
indicated.
The temperature class must be determined by the
operated in accordance with Section 2.6.7
,
“Temperature limits”
2.6.5 Check of the direction of rotation
If there is also a risk of explosion during the
installation phase, the check of the direction
of rotation must under no circumstances be
conducted by briefly switching on the unfilled pump in
order to prevent an inadmissible rise in temperature at
the plain bearings.
We recommend you to only perform a check
of the direction of rotation with the coupling
disengaged or with a rotating field instrument.
See also Section 6.1.2.
2.6.6 Mode of operation of the pump
The pump may only be started with the suction side
shut-off element fully opened and the discharge side
shut-off element slightly opened. Start-up against a
closed check valve is also possible. The discharge
side shut-off element is to be regulated to the
operating design point directly after run-up.
See also Section 5.4.1.
Operation with closed shut-off elements in the
suction and/or discharge lines is not permitted!
There is a risk that even after a short time
high surface temperatures on the pump
housing (casing) may occur owing to rapid
heating of the liquid in the pump interior.
Arapid rise in the pressure inside the pump
involves the risk of overloading to the point of
bursting.
The pump must not be in operation in the
unfilled or partially filled state (dry
running). This results in serious damage to
the pump and additional risks to the environment
can arise.
Dry-running cannot only occur with an
insufficiently filled interior but also in the event
of high gas contents in the fluid.
Operation of the pump outside the admissible
operating range may also lead to dry-running (e.g.
due to evaporation in the interior).
2.6.7 Temperaturelimits
In the normal operating condition the highest
temperatures are to be expected at the
contact point shaft seal/shaft, on the inner
races of the rolling bearings and, at high medium
temperatures, on surface of the pump housing.
In the case of fluids >104°F (40°C) the surface
temperature of the pump housing (casing) is generally
lower than the temperature of the liquid as the lining
has an insulating effect.
If the pump is heated (e.g. heating jacket), it
must be ensured that the temperature classes
prescribed in the annex are observed.
The not heated pump surface must have free contact
with the environment.

Series MNKA, acc. to ASME Page 8
9250-050-en Revision 11
TM 7903 Edition 07/2010
During operation of the pump it must be ensured that
excessive deposits of dust are prevented (regular
cleaning) in order to prevent the pump surface from
heating to above the admissible temperature.
The following Table 1 contains the resultant
theoretical limit values of the temperature of
the liquid medium allowing for the temperature
classes according to European EN 13463-1.
Table 1
Temperature class acc. to EN 13463-1 Limit value of the temperature of the fluid
Lining material PFA/PTFE
Can material 4) CFK-F CFK-H
T6 85 °C (185 °F) not certified to ATEX
T5 100°C(212°F)
T4 135°C(275°F) 125 °C (257 °F) 1) 2) 125°C (257°F) 1) 2)
T3 200°C(392°F) 150 °C (302 °F) 180 °C (356 °F) 3)
T2 300°C(572°F) 150 °C (302 °F) 180 °C (356 °F) 3)
T1 450°C(842°F) 150 °C (302 °F) 180 °C (356 °F) 3)
1) Long life grease lubrication : no restriction.
Oil bath lubrication: standard version with shaft seal T3
labyrinth seal (special design) T4.
2) The limit values specified for the temperature of the fluid at the
pump inlet are determined for the most unfavourable case (high
speed, low flow, low heat capacity of the medium, ....). Under
favourable operating conditions the limit values specified may
be increased by up to 5K after consultation with the manu-
facturer.
3) Consult the manufacturer for higher limit values.
4) The can material has been list in the data sheet.
The plant customer must ensure that the
prescribed operating temperature is observed.
The maximum admissible temperature of the
liquid medium at the pump inlet depends on the
temperature class and the selected lining material
required in each case.
Observance of the temperature class T4 with oil
bath lubrication is not possible with the standard
shaft seal. A labyrinth seal must be used instead
of the shaft seal for the temperature class T4 and
with oil-lubricated rolling bearings.
2.6.8 Maintenance
For safe and reliable operation, it must be
ensured with regular inspection intervals that
the unit is properly serviced and kept in a
perfect technical condition.
Example: Functioning of the ball bearings. The mode
of operation and operating conditions largely
determine the actual service life that can be attained.
Regular checks of the bearings and their running
noise can prevent excess temperatures due to hot-
running bearings, collision of the outer magnet
assembly against the lantern or even defective
bearing seals. See Section 7.2.
In regard to media containing solids, the maintenance
intervals must be set by the operator in accordance
with the conditions of operation.
If auxiliary systems (e.g. external flushing, cooling,
heating) are installed, a check must be made to see
whether monitoring facilities are required to safeguard
their operation.
2.6.9 Electric peripheral equipment
Electric peripheral equipment, e.g. pressure,
temperature and flow sensors etc. must
comply with the prevailing safety
requirements and explosion protection provisions.

Series MNKA, acc. to ASME Page 9
9250-050-en Revision 11
TM 7903 Edition 07/2010
3Transport and storage
The pump or the unit must be transported
properly. It must be ensured that during
transport the pump/unit remains in the
horizontal position and does not slip out of the
transport suspension points.
Apump or motor can be suspended from the ring bolt
provided for this purpose.
The suspension points are not suitable for
transporting a complete unit, i.e. pump with base plate
and motor.
In this case, the slinging points for the ropes on the
base plate are to be used. See Fig.1.
The slinging ropes must not be attached to free shaft
ends or to the ring bolt of the motor.
Fig. 1
Directly after receipt of the goods, the
consignment must be checked for completeness
and any in-transit damage.
Damaged pumps must not be installed in the plant.
When unpacking magnetic drives as single
parts, the relevant notes in Section 7.5.2
must be observed.
Handle goods carefully to prevent damage.
Flange covers serve as protection during transport
and must not be removed.
If the unit is not installed immediately after delivery, it
must be put into proper storage.
The product should be stored in a dry and vibration-
free, well ventilated room at as constant a
temperature as possible.
Elastomers are to be protected against UV light.
In general, a storage period of 10 years should not be
exceeded. An admissible storage period of 4 years
applies to elastomers made of NBR.
If magnetic drives are stored as single parts,
the relevant notes in Section 7.5.2 are to be
observed.
In the case of prolonged storage conservation
agents on machined component surfaces and packing
with a desiccant may be necessary.
3.1 Returnconsignments
Pumps which have conveyed aggressive or
toxic media must be well flushed and cleaned
before being returned to the manufacturer's
works.
It is imperative to enclose a safety information
sheet / general safety certificate on the field of
application with the return consignment.
Pre-printed forms are enclosed with the installation
and operating manual.
Safety precautions and decontamination methods are
to be mentioned.
3.2 Disposal
Parts of the pump may be contaminated with medium
which is detrimental to health and the environment
and therefore cleaning is not sufficient.
Risk of personal injury or damage to the
environment due to the medium or oil!
Wear protective clothing when work is performed
on the pump.
Prior to the disposal of the pump:
Collect any medium, oil etc. which has escaped
and dispose of it in accordance with the local
regulations.
Neutralise any medium residues in the pump.
Separate pump materials (plastics, metals etc.)
and dispose of them in accordance with the local
regulations.

Series MNKA, acc. to ASME Page 10
9250-050-en Revision 11
TM 7903 Edition 07/2010
4 Product description
The housing (casing) dimensions, nominal ratings and
technical requirements of the pump series MNKA
correspond to ASME B73.3M, ISO 15783 / DIN ISO
5199.
The sectional drawing shows the design of the
pump. See Section 9.
All components which come into contact with the
medium are either plastic-lined or made of other
resistant materials, e.g. silicon carbide.
The housing (casing) 100 consists of a metallic shell
with a plastic lining.
The bearing bushes 545 are secured against turning
in the plain bearing pedestal 339.The bearing sleeves
529/1 are secured against turning in the impeller 230
or the bearing sleeves 529/1 in the inner magnet
assembly 859.
The distance ring 504 prevents the two bearing
sleeves 529 from rubbing together during assembly.
Only oil bath lubrication
The bearing pedestal 330 contains radial ball bearings
321 which are lubricated by an oil bath.
The oil bath is sealed against the atmosphere by two
rotary shaft seals 421/1 and 421/2 and the cover
gasket 403.
The can (containment shell) 159 is made of high-
resistance, carbon fibre composite material. It is
protected against the medium by a can (containment
shell) insert 158 made of resistant plastic.
Special designs :
Avacuum-proof can (containment shell) unit is
produced by gluing the can (containment shell) to
the can (containment shell) insert.
The flushing flow flows through the bores in the plain
bearing pedestal 339 into the can (containment shell)
chamber.
From there it is returned into the housing (casing)
through the plain bearings.
The can (containment shell) chamber is also vented
and evacuated through the bores in the plain bearing
pedestal 339.
Additional information is provided in the brochure and
the Product manual.
5 Installation
5.1 Safetyregulations
Equipment which is operated in potentially
explosive areas must satisfy the explosion
protection regulations.
People with a pacemaker are at risk from the
strong magnetic field of the magnetic drive. It
may be life-threatening for them to stay at a
distance of less than 20” (500 mm) to the pump.
5.2 Installation of pump/unit
The structural work must be prepared in accordance
with the dimensions in the installation drawing.
Method of installation: on a grouted base plate and
firm foundation
Align base plate on the ground foundation.
Insert foundation bolts and grout base plate.
Do not tighten the foundation bolts uniformly and
firmly until the mortar has set.
Other possibilities of installing the pump are:
4-point installation
4-point installation with base plate.
As soon as additional installations are
mounted, the stability of the entire unit
installed without a foundation must be
checked.
5.3 Alignment of pump-coupling-
motor
The following information is of a general
nature. If necessary, special notes of the
coupling and motor manufacturer are to be
observed.
After attachment of the base plate on the
foundation and connection of the pipes, the
alignment of the coupling must be carefully
checked and, if necessary, the unit re-aligned with the
motor.
Acoupling check and possible re-alignment is also
necessary if the pump and motor are supplied on a
common base plate and aligned.
Prior to alignment undo the support bracket 183
and then tighten it without stress.
The pump is to be aligned in all directions using a
spirit level (on shaft/discharge nozzle) (admissible
position max. 0,008”/ft (0.2 mm/m)).

Series MNKA, acc. to ASME Page 11
9250-050-en Revision 11
TM 7903 Edition 07/2010
Adistance depending on the coupling used is to be
observed between the pump and motor shafts.
See installation drawing.
Use supports in the direct vicinity of the bolts
foundation/base plate.
Ensure that the unit cannot be started during
work without the coupling guard.
5.4 Piping
Before the pump is installed, both the suction and
supply lines as well as the discharge line are to be
cleaned.
Dirt or damage to the sealing surfaces is best avoided
if the flange covers remain on the flanges until just
before installation.
Use flange gaskets suitable for the medium.
The screw tightening torques in Section 1.1 are to be
observed for tightening the flange screws.
5.4.1 Nominalsize
The operating design point of a centrifugal pump lies
at the intersection of the pump curve and the pipe
curve, see Fig. 2.The pump curve is provided by the
pump manufacturer. The pipe curve is determined
using diagrams or PC programs.
Fig. 2
Under no circumstances can the nominal size of the
piping be derived from the connected nominal size of
the pump.
The pipe nominal size can also be determined using
the flow rate as a rough guide.
)ft(Ax449
)gpm(Q
)s/ft(v 2
=
)m(A
)s/m(Q
)s/m(v 2
3
=
The velocity in the suction line should not exceed
6,56 ft/s (2 m/s) and 16,4 ft/s (5 m/s) in the discharge
line.
When determining the suction line nominal size, the
NPSH value (net positive suction head) must also be
observed. The NPSHR value required for the pump is
specified in the data shee
The NPSHR available in the plant
should be at least 1,64ft(0,5m)
higher than the NPSHR required for
the pump. Otherwise, this will lead to a drop in the
delivery head, cavitation or even failure of the pump.
5.4.2 Nozzleloads
The pump can be subjected to nozzle loads in
accordance with ANSI/HI 9.6..
Changes in the length of the piping caused by
temperature are to be allowed for by appropriate
measures, e.g. the installation of expansion joints.
5.4.3 Suctionline
The suction lines must always be laid on a rising
gradient towards the pump. Otherwise, gas bubbles
may form which considerably reduce the suction line
cross section. Eccentric transition elements must be
installed between different pipe diameters.
Valves which disrupt the course of flow should not be
installed directly upstream of the pump.
Fig. 3
5.4.4 Supplylines
Supply lines should vent towards the reservoir and are
therefore to be laid with a constant downward gradient
towards the pump. Should the piping internals
upstream of the pump be horizontal, a low point can,
of course, be located upstream of these internals.
From here the pipe is then laid with an upward
gradient to the pump so that the gas bubbles which
form here can escape through the pump.
Valves which disrupt the course of flow should not be
installed directly upstream of the pump.
5.4.5 Dischargeline
Do not arrange the shut-off valve directly above the
pump but initially provide a transition section.
The discharge nozzle velocity of the medium can – if
necessary – be reduced.

Series MNKA, acc. to ASME Page 12
9250-050-en Revision 11
TM 7903 Edition 07/2010
5.4.6 Venting and draining
Venting can take place into the discharge line or
upstream of the discharge valve.
Aventing line can also be used as a bypass, drain or
flushing line.
The pump housing (casing) is fitted with a drain
connection as a standard feature. Optionally, the drain
bore can be drilled. See Figure 4.
Fig. 4
5.5 Pipefittings
The following pipe fittings are available from Richter
on request :
Shut-off valves
Check valves
Sight glasses
Priming vessels
Strainers
Pressure gauges
Fig. 5
5.6 Monitoringfacilities
Appropriate monitoring facilities are to be
recommended, depending on the
requirements placed on operational safety and
availability of the unit.
Richter provides information on request and can
supply:
Flow meters
Filling level indicators
Motor load monitors
Temperature monitors
Rolling bearing monitors
Can monitors
Leak monitors
You can obtain the publications "Safe Operation of
Magnetic drive Pumps" and "The Operation of
Centrifugal Pumps without NPSH Problems" on
request.
5.7 Drive
The power consumption of the pump at the operating
design point is specified in the data sheet and works
certificate. If the operating design point was not known
when the pump was dispatched, the power
consumption can be read off the appropriate
performance curves. The max. density, the max.
viscosity and a safety margin are to be allowed for.
Care must be taken when selecting the motor size to
ensure that the excess power is not too great, but
meet requirements acc. to ANSI/HI respec. ISO 5199.
During start-up the magnetic drive could otherwise
stop.
The magnetic drive rating at the nominal speed of
3500 rpm is given in the pump data sheet.
If the motor power exceeds this rating, it is necessary
to check the stoppage of the magnetic drive.
The same also applies if the required drive rating
exceeds 80 % of the magnetic drive rating.
Consult Richter if necessary.
Different operating data can be achieved without
changing the pump through the use of different
speeds, e.g. by means of a frequency converter.
The pump with base plate and motor is illustrated in
the installation drawing.
The operating manual of the motor manufacturer
must be observed.
Amotor with a valid ATEX certificate is to be
used if employed in zone 1 and 2.

Series MNKA, acc. to ASME Page 13
9250-050-en Revision 11
TM 7903 Edition 07/2010
5.8 Coupling
If one coupling half engages with the other, the claw
section is normally to be mounted on the pump shaft
and the coupling half with the smooth end face on the
motor shaft.
Observe the operating manual of the coupling
manufacturer.
Acoupling with a valid ATEX certificate is to
be used if deployed in zone 1 and 2.
Regulations exist, e.g. for the following details:
Arrangement of the coupling halves
Max. bore diameter
Max. transmitted power
Spacing of the coupling halves
Maximum values for offset and angular
misalignment.
Shall the pump housing (casing) and motor remain on
the base plate for repair work, a spacer type coupling
is required.
5.9 Finalcheck
Check the alignment of the coupling again in
accordance with Section 5.3.
It must be possible to easily turn the unit at the
coupling by hand.
5.10 Couplingguard
The pump may only be operated with a coupling
guard in accordance with the accident prevention
regulations.
It must be ensured that the coupling guard
used is either made of spark-free material or
the impact test required by the EN 13463 is
satisfied without any reservations. Richter offers both
versions.
The operator must ensure that, after the coupling
protection has been mounted, the requirements of the
machine guideline are fulfilled.
5.11 Electricconnection
The operator is obligated to connect the assembly in
accordance with existing regulations 8 (IEC, VDE,
etc.).
Allow only a trained electrician to perform the
electrical connection.
Compare the existing mains voltage with the
indications on the motor’s manufacturer’s nameplate
and choose a suitable circuit.
Amotor protection device (motor-circuit switch) is
urgently recommended.
Danger of explosion if the electrical
installation is incorrect.
In areas at risk of explosion, IEC 60079-14
must also be observed for the electrical
installation.
If the pump is mounted on a base plate, ensuring
electrical conduction through the use of a toothed lock
washer or contact disk on the housing foot and
support leg.
The assembly must be grounded in accordance with
currently effective regulations, for example, on the
base plate.

Series MNKA, acc. to ASME Page 14
9250-050-en Revision 11
TM 7903 Edition 07/2010
6 Commissioning/Shutdown
6.1 Initialcommissioning
Normally, the pumps have already been test-run with
water. Unless special agreements have been made,
there could still be residual amounts of water in the
pump. This must be noted in view of a possible
reaction with the medium.
Grease for life lubrication
The rolling bearings are greased for life.
Regreasing is not possible and not necessary.
For service lives, see Section 7.2.
Oil bath lubrication
Pour in oil into the bearing pedestal!
For procedure and the oil grade, see Sections 7.2
and 7.8.5
6.1.1 Filling the pump housing (casing)
Check to see whether the screws on the suction
flange, discharge flange, housing (casing) flange
and drain flange are tightened. When retightening
the housing (casing) screws, make sure that the
support bracket is undone. Otherwise, the pump
could be deformed.
For screw tightening torques see Section 1.1.
Open the suction line fully so that the medium can
flow into the pump.
Open the discharge valve so that the air in the
pump can escape.
If air cannot be vented into the discharge line, e.g.
adrop in pressure in this line is not permitted,
venting must be performed upstream of the
discharge valve.
Monitor the venting operation until no air but only
liquid emerges.
Turn the pump shaft at the coupling several times.
Monitor the venting operation again until no more
air emerges.
Close the discharge valve again until
only the minimum flow rate is obtained
after the motor has been started.
6.1.2 Start-up
Check to see whether the pump shaft can be
readily turned by hand.
Check the direction of rotation of the
motor with the coupling disengaged or
with a rotary field instrument.
As viewed from the motor, the direction of rotation
of the pump is clockwise. See also the direction of
rotation arrow of the pump.
The pump must not run dry during the check
of the direction of rotation.
Engage coupling, check alignment and secure.
Mount coupling guard.
The pump must be completely filled with
liquid. The maximum admissible flow rate
must not be exceeded.
Otherwise the plain bearings can run dry in
both cases.
Switch the motor on.
Set the desired flow by opening the discharge
valve.
When the motor is running but the pump is not
conveying, this means that the magnetic drive
has stopped.
Switch the motor off immediately to prevent
overheating of the magnets.
Then proceed as follows:
Close discharge valve down to the position
"minimum flow rate".
Start motor again.
If the magnetic drive stops again, look for the cause.
Excessive power consumption may cause the
magnets to decouple. If this happens the
pump must be shutdown immediately and
cause corrected prior to restarting. Failure to do this
could result in demage to internal parts Failure to
follow this instructions may result in property damage,
sever personal injury, or death.
6.2 Operatinglimits
The operating limits of the pump/unit in terms
of pressure, temperature, power and speed
are entered in the data sheet and it is
imperative to observe them!
6.2.1 Abrasivemedia
If liquids with abrasive constituents are
conveyed, increased wear at the pump is to
be expected. The inspection intervals should
be reduced compared with the usual times.
6.2.2 Min./max. flow rate
The operating range generally recommended lies at
0.3 Q
opt to 1.1 Q opt.Consult the manufacturer for
operation outside this range and observe Section
2.6.2.

Series MNKA, acc. to ASME Page 15
9250-050-en Revision 11
TM 7903 Edition 07/2010
6.3 Shutdown
Close discharge valve down to the position
"minimum flow rate"
Switch motor off.
Close discharge valve completely.
Only close the suction line if the pump is to be
evacuated or dismantled.
For all work on the machine, make sure that
the motor cannot be inadvertently switched
on.
If the pump is to be evacuated or flushed,
observe the local regulations.
If the pump has been operated with a
chargeable liquid, it must be filled with inert
gas (e.g. nitrogen) to prevent an explosive
atmosphere.
It is recommended to wait one hour before the pump
is dismantled from the plant to permit static peak
charges to be eliminated.
These measures are not necessary with pumps with a
conductive plastic lining.
If the pump is returned to the manufacturer's, clean
the pump very thoroughly.
See also Section 3.1.
6.4 Restarting
When the pump is restarted, it must be ensured that
all the relative steps as described in Section 6.1 are
repeated, depending on the progress of the shutdown
operation.
6.5 Improper operations and their
consequences (examples)
Inadmissible modes of operation, even for a short
time, can result in serious damage to the unit.
In connection with explosion protection,
potential sources of ignition (overheating,
electrostatic and induced charges, mechanical and
electric sparks) may result from these inadmissible
modes of operation; their occurrence can only be
prevented by adhering to the intended use.
Pump is started up without medium :
The plain bearings in the pump may be destroyed.
Other pump components may be destroyed due to
overheating.
Operation with magnetic drive stopped :
If no heat is dissipated, damage to the inner and
drive magnet assemblies may occur.
Suction line not opened or not opened fully :
Pump suffers cavitation – material damage.
Pump does not achieve the necessary head or
flow rate.
Pump may be destroyed due to overheating.
Discharge valve closed too much:
Pump may be destroyed due to overheating.
Axial thrust too great.
Discharge valve opened too much:
Pump can cavitate. Particularly severe with an
empty discharge line.
Risk of pressure surge.
Possible damage to the plain bearings.
Magnetic drive may stop.
Motor may be overloaded.
Suction valve and discharge valve closed:
Destruction due to rapid overheating and sharp
rise in pressure.
Control of the pump with the suction valve
Cavitation – the flow is only to be regulated on the
discharge side.
Overrun of the admissible gas content:
The flow may stop.
Switch pump and vent off for renewed
conveyance.
Make sure that the gas content is not exceeded, as
described in the intended use.

Series MNKA, acc. to ASME Page 16
9250-050-en Revision 11
TM 7903 Edition 07/2010
7Maintenance
7.1 Screw connections of the
housing (casing)
After initial loading by the operating pressure and
operating temperature the tightening torques of all
connection screws must be checked at the following
points:
housing (casing) flange
suction flange
discharge flange
See also Section 6.1.1, para. 1.
7.2 Bearingpedestal
The temperature of the bearing pedestal is
not to exceed more than 122 °F (50 °C) and
under no circumstances 176 °F (80 °C).
If higher temperatures do occur, call in qualified staff
without delay. If this is not possible, the pump must be
shut down and taken out of service.
In many cases a vibration measurement is
recommended to detect bearing wear in good time.
7.2.1 Grease for life lubrication
Grease fill bearings of the series 2RS are installed as
standard features. The grease is lithium-saponified.
The admissible temperature range is – 22 °F to 230 °F
(– 30 °C to + 110 °C).
The rolling bearings are designed for an L
10 service
life of > 17,500 hours. The service life of the grease
filling guaranteed by the bearing manufacturers is
given in the following table.
Size Bearing size > Service life
Group 1 6207-2RS / 15000 hr*
Group 2 6210-2RS / 15000 hr*
*at bearing temperature < 122 °F (50 °C)
at bearing temperature 158 °F (70 °C) approx. 7500 hr
If the pump is serviced, it is recommended to also
replace the bearings as a precaution.
In potentially explosive works it is
advisable to monitor the condition of
the rolling bearings.
7.2.2 Oil bath lubrication
We recommend a mineral oil with the following
characteristics for an expected bearing temperature of
about 158 °F (70 °C):
Viscosity index : approx. 85
Kinematic viscosity at 104 °F (40 °C) :s
2
mm
40.appr
Afully synthetic gear oil to ISO VG 220 is to be used
for temperatures below – 68 °F (– 20 °C).
Replacing the bearings: The ball bearings are
designed for an L10 service life of >17,500 hours.
We recommend 17.500 working hours respectively
every 3 years a change of bearing should be made.
Oil changes: 1x per year at bearing temperatures of
about 122 °F (50 °C).
Every 6 months at bearing temperatures of about
158 °F (70 °C).
At higher temperatures more frequently in accordance
with the regulations.
When the pump is serviced, it is recommended to
replace the bearings and shaft seals as a precaution
and to pour in fresh oil.
Oil level check: The oil level is to be regularly
checked on the constant level oiler 638/1 to ensure
safe operation.
It must be ensured that there is always oil in the
constant level oiler; it must under no circumstances be
completely drained.
In potentially explosive works it is
advisable to monitor the condition of
the ball bearings
If there is a suspicion that splash water could have
entered the bearing pedestal, the oil must be replaced
immediately. Even small amounts of water in the oil
reduce the service life of the ball bearings to a fraction
of the normal service life.
7.3 Cleaning
Care must be taken when cleaning the pump to
ensure that it is not exposed to a strong water jet.
The ingress of water into the bearing pedestal will
substantially impair bearing lubrication.
7.4 Stand-bypumps
If a pump is on stand-by, it is to be started up from
time to time. Regularly turn the shaft by hand in the
direction of rotation.
This operation is to be performed more often for
pumps which are exposed to very strong vibrations
from the plant.
When dismantling the pump from the plant, drain it,
thoroughly clean it, seal with flange covers and store
in accordance with the instructions.

Series MNKA, acc. to ASME Page 17
9250-050-en Revision 11
TM 7903 Edition 07/2010
7.5 Notes on dismantling
All repair and maintenance work is to be performed
by skilled staff using appropriate tools and original
spare parts.
Is the necessary documentation available?
Has the pump been taken out of operation,
evacuated and flushed correctly? See also
Section 6.3.
If no new assembly is performed immediately after
dismantling, the plastic and ceramic components in
particular must be stored carefully.
7.5.1 Protectiveclothing
Even if the pump has been properly
evacuated and flushed, residue of the
medium may still remain in the pump, e.g.
between sealing surfaces or in the bearing seats or in
the can (containment shell) or the can (containment
shell) insert.
Plastic components may absorb medium which
gradually emerges from the material after flushing.
Proper protective clothing is to be worn.
Protective clothing is also to be worn even if only the
bearing pedestal is to be removed. Medium may have
penetrated the lantern chamber through the can
(containment shell).
7.5.2 Magneticfields
Caution ! Strong magnetic fields !
Risk during dismantling and in the vicinity of
magnetic drives as single parts.
Remove loose parts and other magnetisable metals
from the work bench. They could otherwise be
attracted: Risk of accident!
Place any tools needed at a safe distance.
Keep electronic equipment and measuring
instruments at a distance. In cases of doubt consult
the equipment manufacturer.
Hold magnetic drives as single parts firmly or secure.
Otherwise they could be attracted, for example, by a
vice: Risk of accident!
People with an artificial pacemaker:
Keep torso at a minimum distance of
20” (500 mm).
Mechanical watches as well as electronic data carriers
and digital watches or pocket calculators:
6” (150 mm) distance.
Data carriers such as credit cards, cheque cards, ID
cards with magnetic strips or magnetic tape:
6” (150 mm) distance.
7.6 Dismantling
There are 3 possibilities for dismantling:
1. Remove the complete pump from the plant.
2. Remove the complete slide-in unit, i.e. the housing
(casing) remains in the plant.
If the coupling is a spacer-type coupling, the
motor can also remain in the plant.
3. Only remove the drive section, i.e. the pump does
not need to be drained (back pull-out design).
See
Section 5.8.
The dismantling dimension is 3,78" (96 mm) for group
1and 5,12" (130 mm) for group 2. See drawing 9220-
00-3006.
Dismantling of the complete pump is described.
Undo the support bracket 183 from the base plate.
The bearing pedestal 330 and support bracket are
one part in bearing pedestal group 1. In bearing
pedestal group 2 the support bracket 183 is
secured with 2 hex. screws 901/2 and tooth lock
washers 936/2 to the bearing pedestal 330.
Undo housing (casing) screws 901/3.
Remove housing (casing) 100.
If the housing (casing) 100 remains in the plant, leave
the housing (casing) gasket 401 in the centering to
protect the housing (casing) sealing surface.
7.6.1 Removing the bearing pedestal
Caution ! Magnetic forces !
Risk of accident !
High magnetic forces can trap fingers and personal
injury.
Axial forces are produced when the bearing pedestal
330 is pulled out of the lantern 344. They diminish
again abruptly after it has been pulled out.
The torque of the magnetic drive installed is indicated
on the name plate.
Undo screws 901/4 of the lantern/bearing pedestal.
Separate bearing pedestal 330 from the lantern
344 using the jacking screws 908/1.
Remove flat gasket 400/1.
7.6.2 Dismantling the bearing pedestal,
long life grease lubrication
Clamp the end of the drive shaft 213 in a vice. Use
protective jaws.
Undo hex. socket screw 914/1 counterclockwise.
Pull off drive magnet assembly 858.
Remove pump from the vice.
Undo rear bearing cover 361.
Remove wavy spring washer 953/1.
Pull out drive shaft 213 with the two radial ball
bearings 321.

Series MNKA, acc. to ASME Page 18
9250-050-en Revision 11
TM 7903 Edition 07/2010
Both radial ball bearings lie against the shaft collar,
so remove them singly on a press.
Remove support bracket 183 (with bearing
pedestal group 2).
7.6.3 Dismantling the bearing pedestal,
oil bath lubrication
Remove hex. screw 901/4 and drain oil.
Clamp the end of the drive shaft 213 in a vice. Use
protective jaws.
Undo hex. socket screw 914/1 counterclockwise.
Pull off drive magnet assembly 858.
Remove pump from the vice.
Undo rear bearing cover 361 and pull off the shaft
with the rotary shaft seal 421/1 and cover gasket
403.
Remove wavy spring washer 953/1.
Pull out drive shaft 213 with the two radial ball
bearings 321/1, 321/2.
Both radial ball bearings lie against the shaft collar,
so remove them singly on a press.
Pull rotary shaft seal 421/2 out of the bearing
pedestal.
Remove support bracket 183 (with bearing
pedestal group 2).
7.6.4 Dismantling the slide-in unit
If the bearing pedestal has not been dismantled:
Caution ! Magnetic forces !
Risk of accident !
Axial forces are produced when the plain bearing
pedestal 339 is pulled out of the lantern 344.They
diminish again abruptly after it has been removed.
The torque of the magnetic drive installed is indicated
on the name plate.
Undo hex. screws 901/5 lantern/plain bearing
pedestal.
Pull plain bearing pedestal 339 out of the lantern
344.
Possibly loosen the centering of the plain bearing
pedestal with a rust dissolver and levers.
It is imperative to use clamping jaws with a
rubber surface!
Clamp the metallic surfaces of the plain bearing
pedestal 339 in a vice.
Using a strap wrench or assembly wrench, undo
the impeller 230 and inner magnet assembly 859.
Right-hand thread!
Remove inner magnet assembly 859.
Remove O-ring 912/3.
Pull the bearing sleeve 529/2,impeller 230,bearing
sleeve 529/1 and distance ring 504 out of the plain
bearing pedestal 339 or off the pump shaft.
.
Make sure that no plain bearing parts fall.
Silicon carbide is easy to break.
Use isolated gloves when handling hot
bearings. Failure to follow this instructions
may result in property damage, sever
personal injury, or death.
If the bearing bushes 545 have to be removed
from the plain bearing pedestal 339, a Richter jig is
best used for this.
Store bearing sleeves 529 and bearing bushes 545
in pairs which belong together.
To dismantle the can (containment shell) 159,can
(containment shell) insert 158,intermediate ring
509/1, pull parts out of the lantern 344.
Only separate can (containment shell) 159 and can
(containment shell) insert 158 if one part has to be
replaced. If separation is not possible, the unit
must be cooled to approx. 41 °F (5 °C).
In the case of a vacuum-tight design the can
(containment shell) insert is glued to the can
(containment shell). Separation is not possible
without destroying the can (containment shell).
In the case of a can (containment shell) with a can
(containment shell) monitor using a flexible p.c.
board, dismantling is possible. Reassembly,
however, should only be performed at the
manufacturer's works.
7.7 Notes on assembly
Use original spare parts. See also Section 2.4.
Do not use any defective parts.
Has the pump been shut down, drained and
flushed in accordance with the regulations?
See also Section 6.3.
Apply Anti-Seize-Special assembly paste (e.g.
from Weicon) to fitted surfaces (not stainless steel
parts).
The thread in the impeller 230,the inner magnet
assembly 859 and on the pump shaft 211 must not
be greased as otherwise no optimum glued
connection is possible.
Install plain bearings in pairs as supplied or stored.
Check whether all parts fit and only then assemble.
Important dimensions (centerings, bearing fits or
bearing play) are to be checked prior to assembly;
perform a trial assembly if required.
It is recommended to replace the gaskets 400/1
and 401 as well as the wavy spring washer 953/1
during assembly.
Prior to the assembly of parts with magnets,
remove any metal particles adhering to them.
Acomplete assembly process is described in the
following.
Sub-sections can be deduced from this.

Series MNKA, acc. to ASME Page 19
9250-050-en Revision 11
TM 7903 Edition 07/2010
7.8 Assembly
7.8.1 Assembly of the bearing pedestal,
long life grease lubrication
Press both radial ball bearings 321/1 und 321/2
onto the drive shaft 213.
Insert key 940/1 into the drive shaft.
Install pre-assembled drive shaft into the bearing
pedestal 330 from the motor side.
Insert wavy spring washer 953/1 into the bearing
pedestal 330.
Mount rear bearing cover 361 with hex. socket
screws 914/2.
Mount support bracket 183 (with group 2) with hex.
screws 901/2 and tooth lock washers 936/2.
7.8.2 Assembly of the bearing pedestal,
oil bath lubrication
Press both radial ball bearings 321/1 and 321/2
onto the drive shaft 213.
Insert rotary shaft seal 421/2 into the bearing
pedestal.
Insert key 940/1 into the drive shaft.
Install pre-assembled drive shaft into the bearing
pedestal 330 from the motor side.
Insert wavy spring washer 953/1 into the bearing
pedestal 330.
Insert cover gasket 403 into the bearing pedestal.
Insert rotary shaft seal 421/1 into the rear bearing
cover 361.
Mount rear bearing cover 361 with hex. socket
screws 914/2.
Mount support bracket 183 (with group 2) with hex.
screws 901/2 and tooth lock washers 936/2.
7.8.3 Drive magnet assembly
Clamp the pre-assembled bearing pedestal 330 on
the shaft end in the vice so that the carrier groove
is facing upwards.
Mount the drive magnet assembly 858 onto the
drive shaft so that the driver cams engage.
Screw in hex. socket screw 914/1 with tooth lock
washer 936/1.Secure thread with a drop of Loctite,
for example. For tightening, a hex. socket key with
120 mm minimum length is required.
Screw bearing pedestal 330 / lantern 344 together
with hex. socket screws 901/4.
7.8.4 Assembly of can unit
Introduce can insert into the can (containment
shell). If this is not possible, cool can (containment
shell) insert to approx. 41 °F (5 °C).
Place intermediate ring 509/1 in the lantern 330.
Insert the entire unit into the lantern 344.
7.8.5 Perform trial assembly of the plain
bearing pedestal with impeller,
inner magnet assembly and plain
bearings
Without adhesive
Without O-ring 412/3.
Install bearing bushes 545/1 and 545/2 and press
in firmly.
Push on bearing sleeve 529/1 on the impeller side
and install this unit in the plain bearing pedestal
339.Make sure that the cams of the anti-torsion
insert engage properly in the impeller.
Push distance ring 504 and bearing sleeve 529/2
onto the pump shaft.
Push inner magnet assembly 859 onto the pump
shaft.
Permit the anti-torsion cams of the pump-side
bearing sleeve 529/1 to engage in the grooves of
the impeller.
Screw on inner magnet assembly 859 together
with the bearing sleeve and tighten.
7.8.6 Checking bearing play Z and
impeller distance X
The distances X, Y and Z are indicated in the works
certificate.
X: Distance behind the impeller
Y: Distance in front of the impeller
Z: Axial play of the plain bearings
Press inner magnet assembly towards the
impeller.
Measure distance X1behind the impeller.
Press impeller towards the motor.
Measure distance X2behind the impeller.
Z=X
1- X2
Are the values correct?
These values must be checked after final assembly.

Series MNKA, acc. to ASME Page 20
9250-050-en Revision 11
TM 7903 Edition 07/2010
7.8.7 Finalassembly
Dismantle trial assembly for determining the bearing
play again and perform the final assembly.
With the O-ring 412/3
With the distance ring 504
With 1 drop of adhesive on the shaft thread, e.g.
Loctite 243 from Loctite or an equivalent.
Only one drop of the adhesive is to be applied per
thread.
Otherwise the next dismantling operation will be more
difficult or no longer possible without destroying
components.
Install plain bearing pedestal 339 and tighten hex.
screws 901/5.
Strong axial forces are again produced when
the completely assembled plain bearing
pedestal is inserted into the lantern.
Push the entire slide-in unit with housing (casing)
gasket 401 into the housing (casing) 100 and
screw together with hex. screws 901/3.
When tightening the housing (casing) screws 901/3,
make sure that the support bracket 183 is firmly
positioned. If necessary, undo support bracket, align
and secure again.
For tightening torques, see Section 1.1.
7.8.8 Fill bearing pedestal with oil
Oil quantities:
For group 1 appr. 17 oz (500 ml)
For group 2 appr. 50 oz (1460 ml)
Groups see Section 1.
Type of oil:
See Section 7.2.2.
Procedure for filling with oil:
Tilt constant level oiler 638/1.
Fill the oiler with oil.
Swing the constant level oiler into the vertical
position.
If the oil level still falls too much, pour more oil into
the oiler.
Fig. 6
7.9 Tests
The pumps are tested with water at the
manufacturer's.
The operating data measured are documented in a
works certificate.
If, during a test after repairs, discrepancies compared
with the works certificate are discovered, the following
people can be called in:
1. in-house pump office
2. ThemanufacturerRichter
oritslocalagent
The following conveying data can be checked using
the pump performance curves:
Flow rate
Head
Power requirement
NPSHR