Richter Mnk series User manual

INSTALLATION AND OPERATING MANUAL

Translation of the original manual

Keep for future use!

transport, installation, operation and maintenance

Subject to change without notice.

Reproduction is generally permitted with indication of the source.

9230-003-en Revision 19 Edition 06/2022

Series MNK

Sealless Chemical

Magnetic Drive Pump

Bearing lubrication: long life grease or oil

bath

Bearing pedestal group: 4

Series MNK pedestal group 4 Page 2
 
 
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List of Contents
List of Contents.........................................2 
Relevant documents.................................3 
1Technical data......................................3 
1 Tightening torques.......................................3 
2 Type plate, dry-running, ATEX and housing 
markings......................................................4 
3 Spare parts..................................................4 
2Notes on safety ....................................5 
1 Intended use................................................5 
2 Notes on safety for the customer / operator 6 
3 Notes on safety for maintenance.................6 
4 Conversion work and production of spare 
parts by the customer..................................6 
5 Improper operation ......................................6 
6 Special requirements for explosion protection

6.1 Filling the unit.................................................. 6 
6.2 Special operating conditions ...........................7 
6.3 Chargeable liquids..........................................7 
6.4 Identification....................................................7 
6.5 Check of the direction of rotation..................... 7 
6.6 Mode of operation of the pump .......................7 
6.7 Temperature limits.......................................... 8 
6.8 Maintenance...................................................8 
6.9 Electric peripheral equipment..........................8 
3Transport and storage.........................9 
1 Return consignments...................................9 
2 Disposal.......................................................9 
4Product description ...........................10 
5Installation..........................................10 
1 Safety regulations......................................10 
2 Installation of pump/unit.............................10 
3 Alignment of pump-coupling- motor ..........10 
4 Piping.........................................................11 
4.1 Nominal size................................................. 11 
4.2 Nozzle loads................................................. 11 
4.3 Suction line................................................... 11 
4.4 Supply lines .................................................. 11 
4.5 Discharge line............................................... 11 
4.6 Venting and evacuating................................. 12 
5 Pipe fittings................................................12 
6 Monitoring facilities....................................12 
7 Drive ..........................................................12 
8 Coupling.....................................................13 
9 Final check.................................................13 
10 Coupling guard ..........................................13 
11 Electric connection ....................................13 
6Commissioning / Shutdown..............14 
1 Initial commissioning .................................14 
1.1 Filling the pump housing............................... 14 
1.2 Start-up......................................................... 14 
2 Operating limits......................................... 14 
2.1 Abrasive media............................................. 14 
2.2 Min./max. flow rate........................................ 15 
3 Shutdown.................................................. 15 
4 Restarting.................................................. 15 
5 Improper operations and their consequences 
(examples) ................................................ 15 
7Maintenance.......................................16 
1 Screw connections of the housing............ 16 
2 Bearing pedestal....................................... 16 
2.1 Long life grease lubricated rolling bearings ... 16 
2.2 Oil bath lubrication........................................ 16 
3 Cleaning.................................................... 16 
4 Stand-by pumps........................................ 17 
5 Notes on dismantling ................................ 17 
5.1 Protective clothing ........................................ 17 
5.2 Magnetic fields.............................................. 17 
6 Dismantling ............................................... 17 
6.1 Dismantling the slide-in unit.......................... 17 
6.2 Dismantling drive unit Long life grease 
lubrication..................................................... 18 
6.3 Dismantling drive unit oil bath lubrication ...... 18 
7 Notes on assembly ................................... 19 
8 Assembly................................................... 19 
8.1 Assembly of drive unit Long life grease 
lubrication..................................................... 19 
8.2 Assembly of drive unit oil bath lubrication...... 19 
8.3 Trial assembly of the slide-in unit.................. 19 
8.4 Assembly of slide-in unit............................... 20 
8.5 Final assembly.............................................. 22 
8.6 Fill bearing pedestal with oil.......................... 23 
9 Tests ......................................................... 23 
8Malfunctions.......................................24 
9Exploded drawing..............................25
1 Long life grease lubrication....................... 25 
2 Oil bath lubrication .................................... 26 
Sectional drawing ..............................27 
1 Legend...................................................... 27 
2 Sectional drawing long life grease lubrication

3 Sectional drawing oil bath lubrication ....... 29 
Assembly aids....................................30 
1 Boring template for housing drain............. 30 
2 Pull-off device for plain bearing bushes.... 30 
3 Universal impeller wrench and universal 
inner magnet assembly clamping device.. 30 
4 Sliding and support pedestal for the slide-in 
unit ..............Error! Bookmark not defined. 
 

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Relevant documents

♦Data sheet

♦Works certificate

♦Sectional drawing

Long life grease lubrication

MNK 125-100-315 9230-00-3051

MNK 200-150-315 9230-00-3030

Oil bath lubrication

MNK 125-100-315 9230-00-3050

MNK 200-150-315 9230-00-3032

Dimensional drawing

MNK 125-100-315 9230-00-3053

MNK 200-150-315 9230-00-3034

♦Installation drawing 9230-00-3040

♦Performance curves

♦Spare parts list

♦Operating manual and declaration of conformity mo-

tor*

♦Operating manual and declaration of conformity

coupling *

♦Supplementary Installation and Operating Manual

for external flushing 9230B010-en *

♦Supplementary Installation and Operating Manual,

„SAFESEAL®“ 9230B025-en *

♦Supplementary Installation and Operating Manual,

„SAFERUN®“ 9230B020-en *

♦Supplementary Installation and Operating Manual,

„ heating jacket “ 9000B001-en *

* if contained in the scope of delivery

Appendix to the operating manual

♦Operational limits 9230-00-3041

♦Declaration of conformity with ATEX

♦Declaration of conformity without ATEX

♦Form for Safety Information Concerning the Con-

tamination 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

Telephone: +49 (0) 2152 146-0

Fax: +49 (0) 2152 146-190

E-Mail: [email protected]m

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, MNK 200-150-315 / MNK 125-100-

315, long life grease lubrication and oil bath lubrication

Heavy-duty horizontal design, sealless, free of eddy

currents

Technical specifications to ISO 15783 and DIN ISO

5199

Connecting dimensions to ISO 28581) / DIN EN 22858

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

_____________________

1) For MNK 125-100-315, the dimensions f, w, and d deviate

from the standard.

Materials :

Pressurized parts:

ductile cast iron 5.3103 / ASTM A395, carbon fibre

composite material

Wetted parts:

PFA, PTFE, SSiC, FFKM,

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 dam-

age to the pump and additional risks

to the environment can arise.

Dry-running cannot only occur with an in-

sufficiently 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 evapo-

ration in the interior).

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2.6.7 Temperature limits

In the normal operating condition, the highest temper-

atures 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.

We would like to point out that the sur-

face temperature of the pump housing is

only slightly below the medium tempera-

ture.

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.

When operating the pump, make sure that

an excessive deposit of dust is avoided

(possibly regular cleaning). This prevents

the pump surface from heating to above

the admissible temperature.

Table 1 below indicates the admissible medium tem-

perature, depending on the pump design, as a DIN

EN ISO 80079-36. (see appendix to the operating

manual Operational: limits 9230-00-3041)

Table 1

Temperature class

as per DIN EN ISO

80079-36

Limit value of the pumped

liquid temperature

Lining material

PFA/PTFE

Can material 2)

CFK-F

T4 (135 °C)

125 °C 1)

T3 (200 °C)

180 °C 3)

1) Long life grease-lubricated rolling bearings: No restrictions.

T4 only applies to operation up to 1750 rpm

2) The can material has been list in the data sheet.

3) If the temperature of the pumped liquid exceeds 180 °C, the

ATEX approval becomes permanently invalid. The ATEX plate

must be removed immediately by the operator. A new ATEX

approval can only be issued by a judge. For this purpose, the

pump can be sent in for inspection.

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.

2.6.8 Maintenance

To achieve safe and reliable operation, it

must be ensured in inspections at regular

intervals that the unit is properly serviced

and kept in technically perfect order.

Example: Functioning of the rolling bearings. The mode

of operation and operating conditions largely determine

the actual service life that can be attained.

Regular checks of the bearing pedestal area can pre-

vent excessive temperatures due to hot-running rolling

bearings, collision of the drive 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.

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3 Transport 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.

A pump or the motor can be suspended from the crane

hook lug 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.

picture 1

Directly after receipt of the goods, check the

consignment for completeness and any in-transit

damage.

Damaged pumps must not be installed in the plant.

When unpacking magnetic drives as sin-

gle 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,

store them properly.

The pumps be stored in a dry, vibration-free and well-

ventilated room at as constant a temperature as possi-

ble.

Elastomers are to be protected against UV light.

Generally, a storage period of 10 years does not ex-

ceeded. An admissible storage period of 4 years ap-

plies 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.

♦Neutralize any medium residues in the pump.

♦Separate pump materials (plastics, metals etc.) and

dispose of them in accordance with the local regu-

lations.

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4 Product description

The housing dimensions, nominal ratings and technical

requirements of the pump series MNK 200-150-315

and 125-100-315 correspond to ISO 2858 1) / DIN EN

22858 / ISO 15783 / DIN ISO 5199. The technical re-

quirements of the VDMA 24279 are satisfied.

The sectional drawing shows the design of the pump.

See Section 10.1.

All components which come into contact with the me-

dium are either plastic-lined or made of other resistant

materials, e.g. silicon carbide.

The housing 100 consists of a metallic shell with a plas-

tic lining.

The bearing bushes 545 and axial bearing 314 are se-

cured against turning in the plain bearing pedestal.

The bearing sleeves 529/1 are in the impeller, resp.

529/2 in the inner magnet assembly secured against

turning.

The can 159 is made of CFK (high-resistance, carbon

fibre composite material). It is protected against the

medium by a can insert 158 made of resistant plastic.

_____________________

1) For MNK 125-100-315, the dimensions f, w, and d deviate

from the standard.

The plain bearing pedestal 339 separates the hydraulic

section of the pump from the can area. Both chambers

are connected by flushing bores in the plain bearing

pedestal so that an internal flushing circuit is formed

owing to the pressure differences. This circuit serves to

flush and cool the plain bearings.

Only oil bath lubrication:

The bearing pedestal 330 contains radial ball bearings

321/1, 321/2, which are lubricated by an oil bath. This

oil bath is sealed by means of the shaft seals 421/1,

421/2 and the o-ring 412/1.

Special designs:

♦A vacuum-proof can unit is produced by gluing the

can to the can insert.

The can chamber is also vented and evacuated

through the bores in the plain bearing pedestal.

Additional information is provided in the brochure.

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.

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 cou-

pling must be carefully checked and, if necessary, the

unit re-aligned with the motor.

♦A coupling 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 deviation max. 0.2 mm/m).

♦A distance 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 foun-

dation/base plate.

Ensure that the unit cannot be started

during work without the coupling guard.

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5.4 Piping

Before the pump is installed, both, the suction and sup-

ply 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 be-

fore 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 dia-

grams or PC programs.

picture 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.

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, cavita-

tion or even failure of the pump.

5.4.2 Nozzle loads

The pump can be subjected to nozzle loads acc. to DIN

EN ISO 5199. Values see installation drawing.

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 Suction line

The suction lines must always be laid on a rising gradi-

ent 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.

picture 3

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 up-

stream 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 es-

cape 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.

)m(A )s/m(Q

)s/m(v 2

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5.4.6 Venting and evacuating

Venting can take place into the discharge line or up-

stream 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. 4

5.5 Pipe fittings

The following pipe fittings are available from Richter on

request:

♦Check valves

♦Shut-off valves

♦Sight glasses

♦Priming vessels

♦Strainers

♦Pressure gauges

picture 5

5.6 Monitoring facilities

Appropriate monitoring facilities are to be

recommended, depending on the require-

ments placed on operational safety and

availability of the unit.

Richter provides information on request and can sup-

ply:

♦Flow meters

♦Filling level indicators

♦Motor load monitors

♦Temperature monitors

♦Rolling bearing monitors

♦Can monitors

♦Leak monitors

♦SAFERUN® Condition Monitoring System

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

point is specified in the data sheet or factory certificate.

If the operating point is not known when the pump is

delivered, the power requirement can be taken from the

corresponding characteristic curves. The maximum

density, maximum viscosity and a safety margin must

be taken into account.

When selecting the motor size, make sure that the

power surplus is not too large, but that the require-

ments according to ISO 5199 are met. Otherwise, the

magnetic coupling could break off during startup.

The pump data sheet specifies the magnetic coupling

power at the required pump speed.

If the motor power exceeds this magnetic coupling

power—at pump speed—a check for magnetic cou-

pling breakage is required.

Likewise, if the required drive power exceeds 80% of

the magnetic coupling power at pump speed. If neces-

sary, consult Richter.

By using different speeds, e.g. by means of a frequency

converter, different operating data can be achieved

without changing the pump.

The pump with base plate and motor is shown in the

installation plan.

The motor manufacturer’s operating instructions are to

be observed.

If the pump is started directly, i.e. without speed con-

trol by a frequency converter, we recommend using a

soft start in order to prevent magnetic coupling break-

age.

When used in zone 1 and 2, a motor with

valid ATEX approval must be used.

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5.8 Coupling

If one coupling half engages with the other, the claw

section is normally to be mounted on the drive shaft

and the coupling half with the smooth end face on the

motor shaft.

Observe the operating manual of the coupling manu-

facturer.

A coupling 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 misalign-

ment.

♦Maximum values for offset and angular misalign-

ment.

5.9 Final check

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 Coupling guard

The pump may only be operated with a coupling guard

in accordance with the accident prevention regulations.

It should be ensured that the coupling pro-

tection used either consists of non-spark-

ing material or fulfills the impact resistance

test required by DIN EN ISO 80079-36

without any problem.

It must be ensured that the coupling guard used is ei-

ther made of spark-free material or the impact test re-

quired by the EN 13463 is satisfied without any reser-

vations. 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 Electric connection

The operator is obligated to connect the assembly in

accordance with existing regulations 8 (IEC, VDE, etc.).

Only have the electric connection per-

formed by a qualified electrician.

Compare the available mains voltage with the infor-

mation on the type plate of the motor and select a suit-

able circuit.

A motor protection device (motor-circuit switch) is

urgently recommended.

Danger of explosion if the electrical instal-

lation is incorrect.

In potentially explosive areas IEC 60079-

14 must also be observed for the electri-

cal installation.

If the pump is mounted on a base plate, ensuring elec-

trical conduction through the use of a chopper disk or

contact disk on the housing foot and support bracket.

The assembly must be grounded in accordance with

currently effective regulations, for example, on the base

plate.

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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.

Long life grease 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

♦Check to see whether the screws on the suction

flange, discharge flange, housing flange and drain

flange are tightened.

When retightening the housing 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. 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.

♦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 instru-

ment.

♦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.

♦Check alignment of the coupling.

♦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 mag-

netic drive has stopped.

♦Switch motor off immediately in order to prevent

overheating of the magnet assemblies.

Then proceeded as follows:

♦Close discharge valve down to the position "mini-

mum 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

are to be reduced compared with the usual

times.

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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 "mini-

mum 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 in-

ert gas (e.g. nitrogen) to prevent an explo-

sive 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.

These measures are not necessary with pumps with a

conductive plastic lining.

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