Richter Mnk-b 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.

9230-056-en Revision 14 Edition 06/2016

Series MNK-B

Sealless Chemical

Magnetic Drive Pump

Close-coupled design

Size 25-25-100

Series MNK-B, size 25-25-100 Page 2

9230-056-en Revision 14

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List of Contents

List of Contents.................................................2

Relevant documents.........................................3

1Technical data .............................................3

1.1 Tightening torques .......................................... 4

1.2 Type plate, dry-running, ATEX-and housing

markings........................................................... 4

1.3 Spare parts....................................................... 4

2Notes 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 Improper operation.......................................... 6

2.6 Special requirements for explosion protection

....................................................................... 6

2.6.1 Filling the unit........................................................6

2.6.2 Special operating conditions ...............................7

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................................................8

2.6.8 Maintenance..........................................................8

2.6.9 Electric peripheral equipment..............................8

3Transport, storage and disposal...............9

3.1 Return consignments...................................... 9

3.2 Disposal............................................................ 9

4Product description ....................................9

5Installation.................................................. 10

5.1 Safety regulations.......................................... 10

5.2 Installation of pump/unit ............................... 10

5.3 Alignment of pump - motor........................... 10

5.4 Piping.............................................................. 10

5.4.1 Nominal size........................................................10

5.4.2 Nozzle loads........................................................10

5.4.3 Suction line..........................................................11

5.4.4 Supply lines.........................................................11

5.4.5 Discharge line......................................................11

5.4.6 Venting and evacuating .....................................11

5.5 Pipe fittings..................................................... 11

5.6 Monitoring facilities........................................ 11

5.7 Drive................................................................ 11

5.8 Electric connection........................................ 12

6Commissioning/Shutdown.......................13

6.1 Initial commissioning..................................... 13

6.1.1 Filling the pump housing....................................13

6.1.2 Start-up ................................................................13

6.2 Operating limits.............................................. 13

6.2.1 Abrasive media...................................................13

6.2.2 Min./max. flow rate .............................................13

6.3 Shutdown........................................................ 13

6.4 Restarting ....................................................... 14

6.5 Improper operation and their consequences

(examples)...................................................... 14

7Maintenance...............................................15

7.1 Screw connections of the housing.............. 15

7.2 Motor............................................................... 15

7.3 Cleaning.......................................................... 15

7.4 Stand-by pumps ............................................ 15

7.5 Notes on dismantling .................................... 15

7.5.1 Protective clothing..............................................15

7.5.2 Magnetic fields....................................................15

7.6 Dismantling..................................................... 16

7.6.1 Dismantling the slide-in unit..............................16

7.6.2 Dismantling of drive unit.....................................16

7.7 Notes on assembly........................................ 16

7.8 Assembly........................................................ 16

7.8.1 Assembly of drive unit........................................16

7.8.2 Assembly of slide-in unit....................................16

7.8.3 Trial assembly of impeller and bearing bush...16

7.8.4 Determine thicknesses S1and S2of the distance

washers 551........................................................17

7.8.5 Final assembly....................................................17

7.9 Tests................................................................ 17

8Faults ..........................................................18

9Sectional drawing MNK-B, size 25-25-100

(with back plate mades of stainless steel

1.4301/PFA).................................................19

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Relevant documents

Data sheet

Works certificate

Sectional drawing MNK-B Size 25-25-100

Back plate CFK 9230-00-0013

Anchored back plate 9230-00-3024

Dimensional drawing 9230-00-3025

Outline drawing

Performance curves

Spare parts list

Operating manual and declaration of conformity

motor

Appendix to the operating instructions

Operational limits 9200-00-0030

Declaration of conformity with ATEX

Declaration of conformity without ATEX

Form for Safety Information Concerning the

Contamination QM 0912-16-2001_en

On request:

Magnetic drive data Richter TIS 0543-03-0001

Publication: "Centrifugal Pump Operation without

NSPH Problems"

Publication "Safe Operation of Magnetic Drive

Pumps“

1 Technical data

Manufacturer :

Richter Chemie-Technik GmbH

Otto-Schott-Str. 2

D-47906 Kempen

Designation :

Single-stage, plastic-lined, magnetic drive chemical

centrifugal pump, series MNK-B, close-coupled

design, size 25-25-100

Heavy-duty horizontal design, sealless, with back

plate made of stainless steel 1.4301/PFA or

heavy-duty horizontal design, sealless, eddy-current-

free back plate made of CFRP/PTFE

Flange connecting dimensions:

DIN EN 1092-2, type B (ISO 7005-2, type B) PN 16

or flanges drilled to ASME 16.5, Class 150

ATEX Directive 2014/34/EU

Machine Directive 2006/42/EC

Materials :

Pressurized parts:

ductile cast iron EN-JS 1049

Wetted parts:

PFA, PTFE, PE-UHMW, PP, PFA-P, anti-static lining

(PFA/PTFE conductive) SSiC, FKM/FFKM,

see also data sheet

Flow rate : up to 6 m3/h (at 2900-1/min)

Delivery head : up to 14,6 m FS (at 2900-1/min)

Housing discharge pressure : max. 10 bar

Back plate

made of stainless steel 1.4301/PFA 10 bar

not certified to ATEX T3-T6

made of CFRP/PTFE 6 bar

Temperature range : - 60 °C to + 150 °C

Note: Consult the manufacturer for higher pressures

and lower or higher temperatures.

Temperature classes: see Section 2.6.7

Noise pressure level : LWA = ≤ 70 dB acc. to DIN

EN ISO 9614-2

Admissible ambient conditions for pumps acc. to

directive 2014/34/EU (ATEX) :

Ambient temperature range: - 20 °C to + 40 °C

(higher temperature after consulting the manufacturer)

Ambient pressure range: 0,8 barabs to 1,1 barabs

Sizes : 25-25-100

Weight : See data sheet

Dimensions : See installation drawing

Design of the motors to be used :

If the motor is supplied or mounted by the customer,

the following data must be observed:

Design B14

Size 71, 80

Flange Ǿ 120 mm

Front-end tapped bore to DIN 332-2 design D.

The motors must be provided with fixed bearings on

the drive side.

Series MNK-B, size 25-25-100 Page 4

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1.1 Tightening torques

Screws greased, tighten in diametrically opposite

sequence

Housing screws 901/3

Size

No. x size

25-25-100

10 x M 8

Pipe screws, flanges to DIN/ISO

No. x size

4 x M 12

Pipe screws, DIN/ISO flanges drilled to ASME

[mm] [inch]

No. x size

ASME

in-lbs

1“

4 x ½“

1.2 Type plate, dry-running, ATEX-

and housing markings

The stainless steel type plate is firmly riveted to the

housing:

If the operator attaches his identification, it must be

ensured that the pump matches the application in

question.

Example of type 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

Foundry date

1.3 Spare parts

Spare parts for two years of continuous operation in

accordance with DIN 24296 and in consultation with

the manufacturer.

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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.

In addition to the general notes on safety under the

main heading “Safety”, special notes on safety are

included at other points and must be observed.

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 equipment

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 Intended use

Richter pumps of the series MNK-B are 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.

For vertical installation of the pumps, 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 Qopt. 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 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.

Series MNK-B, size 25-25-100 Page 6

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All important features are documented in the data

sheet included in the scope of delivery.

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

resistance 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 For maintenance

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 Conversion work and

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 Improper 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 Special requirements for

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

liquid medium.

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.

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2.6.2 Special operating conditions

The plain bearings are cooled and lubricated

by a flushing flow.

Owing to properties of the medium (e.g. sticking due

to inadmissible solids entrainment, clogging, gas

entrainment etc.) the cooling flow can be interrupted

and, as a result, an inadmissible temperature rise may

occur. Provide appropriate monitoring facilities. See

Section 5.6.

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 or non-observance of the

design data may lead to the decoupling of the

magnetic drive. As a result, eddy currents are induced

on the magnetic drive and the metallic back plate 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 minimum

0.5 m 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 Chargeable liquids

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

operator 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 filled pump and

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 may occur owing to rapid heating of

the liquid in the pump interior.

A rapid 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 liquid medium.

Operation of the pump outside the admissible

operating range may also lead to dry-running (e.g.

due to evaporation in the interior).

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2.6.7 Temperature limits

In the normal operating condition the highest

temperatures are to be expected on the

surface of the pump housing and on the

stainless steel back plate.

We would like to point out that, under extreme

operating (medium temperature >160 °C) and

ambient conditions (ambient temperature

>30 °C), temperatures of over 130 °C may arise on

the surface of the pump housing.

In the case of media >40° C the surface temperature

of the pump housing is generally lower than the

temperature of the medium as the plastic lining acts

as insulation.

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.

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 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.

The principle always applies that no inadmissible

temperatures may be introduced into the motor and

that the specifications of the motor manufacturer as

well as VDMA/TVEI 24263 are to be observed.

The temperature limit values of the liquid medium

given in Table 2 are only applicable if motors are used

where the motor manufacturer permits at least the

following surface temperatures for the motor flange

and shaft:

Table 1

Temperature

class

Motor flange

Motor shaft

70 °C

80 °C

75 °C

85 °C

80 °C

100 °C

80 °C

100 °C

80 °C

100 °C

Observe the figures of the motor manufacturers and

VDMA/ZVEI 24263 on inadmissible ambient

temperatures. If these values are missing, max. 40°C

is to be assumed.

Table 2 below indicates the admissible medium

temperature, depending on the pump design, as a

function of the temperature class in accordance with

EN 13463-1.

Table 2

Temperature

class acc. to

EN 13463-1

Limit value of the temperature

of the liquid

Back plate

CFRP

Back plate

stainless steel

T6 (85 °C)

75 °C 1)

T3 –T6

not certified to

ATEX

T5 (100 °C)

90 °C 1)

T4 (135 °C)

125 °C 1)

T3 (200 °C)

150 °C

T2 (300 °C)

150 °C

T1 (450 °C)

150 °C)

150 °C

1) The limit values specified for the temperature of the medium 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 5 K after consultation with the

manufacturer.

In the case of motors with the ignition protection class

"increased safety", only low surface temperatures are

generally admissible on the motor shaft and on the

motor flange.

In such cases, the max. admissible medium

temperature lies 20 K above the permitted surface

temperature at the interfaces to the motor.

e.g.: max. motor shaft temperature: 60 °C

max. motor flange temperature: 65 °C

This results in an admissible medium temperature at

the pump of 80 °C (60 °C + 20 K).

If values on the admissible ambient temperature are

missing, max. 40 °C is always to be assumed.

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.

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.

In regard to media containing solids, the maintenance

intervals must be set by the operator in accordance

with the conditions of 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.

Regular checks of the motor bearings in

accordance with the operating manual of the

motor manufacturer. Observe ATEX notes.

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3 Transport, storage and disposal

The pump or the unit must be transported

properly. It must be ensured that during

transport the pump/unit remains in the

horizontal position.

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 Return consignments

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.

4 Product description

The sectional drawing shows the set-up of the pump

in the standard design with a back plate made of

stainless steel 1.4301/PFA. 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 100 consists of a metallic shell with a

plastic lining.

The bearing parts are secured against twisting by a

positive connection:

The bearing bushes 545 in the impeller

The right-hand thrust bearing part 393/2 in the

back plate 161

The bearing sleeve 529 in the right-hand thrust

bearing part 393/2

The left-hand thrust bearing part 393/1 in the

bearing sleeve 529

The bearing nut 923/1 with left-hand thread prevents

the bearing components from shifting if axial thrust

occurs in the direction of the suction nozzle.

The back plate 161 is a composite element. The

wetted side is sheathed in plastic. The standard

support structure is made of stainless steel.

As the magnetic drive generates eddy currents in the

stainless steel, the metal around the magnets heats

up. A speed of 2900 rpm and a medium temperature

of 20 °C produce roughly 120 °C in the metal.

The maximum operating pressure is 10 bar. This

back plate made of stainless steel 1.4301/PFA is

not certified for use in the ATEX sector.

As an option, a back plate with a support structure

made of CFRP (carbon-fibre reinforced plastic) is

available. With this design no eddy currents occur and

therefore no elevated temperatures. The maximum

operating pressure is 6 bar.

The flushing flow for the plain bearing lubrication

flows from the impeller rear through the plain bearings

to the suction mouth of the impeller.Additional

information is provided in the brochure.

Series MNK-B, size 25-25-100 Page 10

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5 Installation

5.1 Safety regulations

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 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 alignment are:

4-point-alignment

4-point-alignment 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 - motor

The following information is of a general

nature. If necessary, special notes of the

motor manufacturer are to be observed.

Prior to alignment work, loosen the screwing 901/6,

920/2 in the lantern. Align the unit with the housing

so that there is no tension and retighten the

screwing.

Use supports in the direct vicinity of the bolts

foundation/base plate.

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 Nominal size

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. 1

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.

The velocity in the suction line should not exceed 2.0

m/s and 5.0 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 sheet.

The NPSHR available in the plant

should be at least 0.5 m 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 Nozzle loads

The pump can be subjected to nozzle loads in

accordance with ISO 5199.

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.

v m s Q m s

A m

( / ) = ( / )

( )

Series MNK-B, size 25-25-100 Page 11

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5.4.3 Suction line

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. 2

5.4.4 Supply lines

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 Discharge line

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.

5.4.6 Venting and evacuating

Venting can take place into the discharge line or

upstream of the discharge valve.

A venting line can also be used as a bypass, drain or

flushing line.

The pump housing is fitted with a drain connection as

a standard feature. Optionally, the drain bore can be

drilled.

Fig.3

5.5 Pipe fittings

The following pipe fittings are available from Richter

on request:

Shut-off valves

Check valves

Sight glasses

Priming vessels

Strainers

Pressure gauges

Fig. 4

5.6 Monitoring facilities

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

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.

Series MNK-B, size 25-25-100 Page 12

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Care must be taken when selecting the motor size to

ensure that the excess power is not too great. During

start-up the magnetic drive could otherwise stop.

The magnetic drive rating at the nominal speed of

2900 rpm is given in the pump data sheet.

If the motor rating exceeds this magnetic drive rating –

at nominal speed -, it is necessary to check for any

stoppage of the magnetic drive.

This also applies if the required drive rating exceeds

80% of the magnetic drive rating –at nominal speed.

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.

A motor with a valid ATEX certificate is to be

used if employed in zone 1 and 2.

5.8 Electric connection

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.

A motor 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 chopper

disk 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 MNK-B, size 25-25-100 Page 13

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6 Commissioning/Shutdown

6.1 Initial commissioning

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.

6.1.1 Filling the pump housing

Check to see whether the screws on the suction

flange, discharge flange, housing flange and drain

flange are tightened.

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.

a drop 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.

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 the direction of rotation of the

motor 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.

If no rotating field instrument is available, the

motor may also be activated briefly, with the

pump filled, so that it does run up. You can

observe the direction of rotation through the fan hood.

The pump must not run dry during the check

of the direction of rotation.

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 motor off immediately in order to prevent

overheating of the magnet drive and the back

plate.

Then proceeded 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.

6.2 Operating limits

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 Abrasive media

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 Qopt to 1.1 Qopt. Consult the manufacturer for

operation outside this range. and observe Section

2.6.2.

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.

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