KRAL L Series User manual

Product Specification Sheet
X-Cel House, Chrysalis Way, Langley Bridge, Eastwood, Nottinghamshire NG16 3RY
Tel: [phone] | Email: [email protected] | Website: www.northridgepumps.com
Operating instructions
KRAL screw pumps.
Series L
Mechanical seal/radial shaft seal
OIL 01en-GB
Edition 2019-03
Original instructions

Table of contents
1 About this document ..................................................... 4
1.1 General information .......................................................4
1.2 Associated documents ..................................................4
1.3 Target groups ................................................................4
1.4 Symbols.........................................................................5
1.4.1 Danger levels ....................................................5
1.4.2 Danger signs.....................................................5
1.4.3 Symbols in this document .................................5
2 Safety .............................................................................. 6
2.1 Proper use .....................................................................6
2.2 Foreseeable misuse ......................................................6
2.3 Obligations of the operator-owner .................................6
2.4 Safety instructions .........................................................7
2.4.1 Fundamental safety instructions .......................7
2.4.2 Dangers during transportation ..........................7
2.4.3 Dangers during storage ....................................7
2.4.4 Dangers during installation ...............................7
2.4.5 Dangers during removal....................................7
2.4.6 Dangers during connection work ......................8
2.4.7 Dangers during operation .................................8
2.4.8 Dangers during servicing ..................................8
2.4.9 Dangers during maintenance............................8
2.4.10 Dangers during disposal ...................................9
3 Identification................................................................... 9
3.1 Type code......................................................................9
3.2 Rating plate .................................................................10
4 Technical data .............................................................. 10
4.1 Operating limits............................................................10
4.2 Sound pressure level...................................................11
4.3 Required NPSH values................................................11
4.4 Weights........................................................................12
4.5 Materials ......................................................................13
4.6 Accessories .................................................................13
5 Function description.................................................... 13
5.1 Pump structure ............................................................13
5.2 Pump unit structure .....................................................14
5.3 Functional principle......................................................14
5.4 Housing variants..........................................................15
5.5 Shaft seal.....................................................................15
5.6 Overflow valve .............................................................16
6 Transportation, storage............................................... 16
6.1 Dangers during transportation .....................................16
6.2 Dangers during storage ...............................................16
6.3 Unpacking and checking the state of delivery .............16
6.4 Transporting the pump/pump unit................................17
6.5 Storing the pump .........................................................17
7 Preservation ................................................................. 18
7.1 Preservation table........................................................18
7.2 Preserving the inner surfaces......................................18
7.3 Preserving the outer surfaces......................................18
7.4 Removing the preservation..........................................19
8 Installation, removal .................................................... 19
8.1 Dangers during installation ..........................................19
8.2 Dangers during removal ..............................................19
8.3 Installing the pump.......................................................19
8.4 Removing the pump.....................................................20
9 Connection.....................................................................21
9.1 Dangers during connection work .................................21
9.2 Connecting the pump to the pipe system.....................22
9.3 Assembling the pump and motor .................................22
9.4 Connecting the pump unit to the power supply............24
10 Operation........................................................................24
10.1 Dangers during operation ............................................24
10.2 Commissioning ............................................................25
10.2.1 Cleaning the pipe system ................................25
10.2.2 Filling and venting the pump............................25
10.2.3 Checking the direction of rotation ....................27
10.2.4 Commissioning the pump ................................27
10.3 During operation ..........................................................28
10.3.1 Checking the operating pressure.....................28
10.3.2 Monitoring filters and/or strainers ....................29
10.3.3 Adjusting the overflow valve ............................29
10.3.4 Switching off the pump unit .............................30
10.4 Decommissioning.........................................................30
10.4.1 Decommissioning the pump ............................30
10.5 Recommissioning.........................................................31
10.5.1 Recommissioning the pump ............................31
11 Maintenance...................................................................31
11.1 Dangers during maintenance.......................................31
11.2 Required maintenance.................................................31
11.3 Ball bearing ..................................................................31
11.4 Maintaining the pump...................................................32
11.5 Cleaning the leakage vent hole....................................32
12 Servicing ........................................................................33
12.1 Dangers during servicing .............................................33
12.2 Wear ............................................................................33
12.2.1 Signs of wear...................................................33
12.2.2 Shaft seal.........................................................33
12.3 Replacing the overflow valve .......................................34
12.3.1 Removing the overflow valve...........................34
12.3.2 Installing the overflow valve.............................34
12.4 Replacing the coupling.................................................35
12.4.1 Removing the coupling ....................................35
12.4.2 Installing the coupling ......................................36
12.5 Replacing the ball bearing ...........................................37
12.5.1 Removing the ball bearing...............................37
12.5.2 Installing the ball bearing – mechanical seal ver-
sion ..................................................................38
12.5.3 Installing the ball bearing – radial shaft seal ver-
sion ..................................................................38
12.6 Replacing the mechanical seal ....................................40
12.6.1 Removing the mechanical seal........................40
12.6.2 Installing the mechanical seal..........................40
12.7 Replacing the radial shaft seal.....................................41
12.7.1 Removing the radial shaft seal ........................41
12.7.2 Installing the radial shaft seal ..........................42
12.8 Replacing the screw set...............................................42
12.8.1 Removing the screw set ..................................42
12.8.2 Installing the screw set ....................................43
13 Disposal..........................................................................44
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Table of contents
13.1 Dismantling and disposing of the pump ......................44
14 Troubleshooting........................................................... 44
14.1 Possible faults .............................................................44
14.2 Troubleshooting...........................................................45
15 Accessories .................................................................. 47
15.1 Heating ........................................................................47
15.1.1 Possible types of heating ................................47
15.1.2 Electrical heating system ................................47
15.1.3 Fluid heating system .......................................48
15.1.4 Heating system special design .......................49
16 Spare parts ................................................................... 50
16.1 Overview......................................................................50
16.2 Maintenance kits..........................................................51
16.2.1 Maintenance kit mechanical seal standard/hard
material LFI/LVI/LFT/LVT................................51
16.2.2 Maintenance kit mechanical seal standard/hard
material LFW...................................................52
16.2.3 Maintenance kit mechanical seal standard/hard
material LFM ...................................................53
16.2.4 Maintenance kit radial shaft seal standard/high-
temperature LFI/LVI/LFT/LVT .........................54
16.3 Repair kits....................................................................55
16.3.1 Repair kit screw set LFI/LVI/LFT/LVT/LFM.....55
16.3.2 Repair kit overflow valve LFI/LVI/LFT/LVT/LFM
........................................................................55
16.4 Tool sets ......................................................................56
16.4.1 Tool set, mechanical seal ...............................56
16.4.2 Tool set, radial shaft seal ................................56
16.5 Completions.................................................................57
16.5.1 Completion type LFI/LFT/LFM/LFW................57
16.5.2 Completion type LVI/LVT ................................58
17 Appendix....................................................................... 59
17.1 Tightening torque for screws with metric screw threads
and head contact surfaces ..........................................59
17.2 Tightening torques for screw plugs with thread meas-
ured in inches and elastomer seal...............................59
17.3 Contents of the Declaration of Conformity...................60
Operating instructions OIL 01en-GB Edition 2019-03 3

1 About this document
1.1 General information
1 About this document
1.1 General information
These instructions form part of the product and must be kept for future reference. Furthermore please
observe the associated documents.
1.2 Associated documents
oDeclaration of conformity according to EU Directive 2006/42/EC
oManufacturer's declaration according to EU Directive 2014/68/EU
oData sheet of the pump
oTechnical documentation of the supplied components
Additional documents for ATEX version
oDeclaration of conformity according to EU Directive 2014/34/EU
oATEX supplementary instructions for usage in potentially explosive areas
1.3 Target groups
The instructions are intended for the following persons:
oPersons who work with the product
oOperator-owners who are responsible for the use of the product
Information on the required qualification of the personnel is provided separately at the beginning of the
individual chapters in these instructions. The following table provides an overview.
Target group Activity Qualification
Transport
personnel
Transportation,
unloading
Transport personnel are qualified personnel who carry out the
transportation of products properly due to their training, know-
ledge and experience and on the basis of the relevant provisions.
Transport personnel recognize and avoid possible dangers and
damage to property that are connected with this activity.
Mobile crane
operators,
crane operators,
forklift operators
Unloading,
positioning
Mobile crane operators, crane operators and forklift operators are
qualified personnel who carry out work with cranes and forklifts
properly due to their training, knowledge and experience and on
the basis of the relevant provisions. Mobile crane operators, crane
operators and forklift operators recognize and avoid possible
dangers and damage to property that are connected with this
activity.
Fitter Mounting,
connection
Fitters are qualified personnel who carry out the mounting work
properly due to their training, knowledge and experience and on
the basis of the relevant provisions. Fitters recognize and avoid
possible dangers and damage to property that are connected with
this activity.
Electrician Electrical
connection
Electricians are qualified personnel who carry out work on elec-
trical equipment and installations properly due to their training,
knowledge and experience and on the basis of the relevant provi-
sions. Electricians recognize and avoid possible dangers and
damage to property that are connected with this activity.
Trained
personnel
Delegated task Trained personnel were instructed by the operator-owner in the
task delegated to them and the possible dangers arising through
improper behaviour.
Tab.1: Target groups
4OIL 01en-GB Edition 2019-03 Operating instructions

1 About this document
1.4 Symbols
1.4 Symbols
1.4.1 Danger levels
Signal word Danger level Consequences of non-observance
DANGER Immediate threat of danger Serious personal injury, death
WARNING Possible threat of danger Serious personal injury, invalidity
CAUTION Potentially dangerous situation Slight personal injury
ATTENTION Potentially dangerous situation Material damage
1.4.2 Danger signs
Meaning Source and possible consequences of non-observance
Electrical voltage Electrical voltage causes serious physical injury or death.
Raised load Falling objects can result in serious physical injury or death.
kg
Heavy load Heavy loads can result in serious back problems.
Risk of slipping Discharging pumped liquid and oils on the foundation or
tread surfaces can cause falls with serious physical injury
or death.
Flammable substances Discharging pumped liquid and oils can be easily inflam-
mable and can result in serious burns.
Hot surface Hot surfaces can cause burns.
1.4.3 Symbols in this document
Meaning
Warning personal injury
Safety instruction
Request for action
1.
2.
3.
Multi-step instructions for actions

Action result

Cross-reference
Operating instructions OIL 01en-GB Edition 2019-03 5

2 Safety
2.1 Proper use
2 Safety
2.1 Proper use
oUse the pump solely for transporting lubricating liquids that are chemically neutral and that do not
contain gas or solid components.
oUse the pump only within the operating limits specified on the rating plate and in the chapter "Tech-
nical data". In the case of operating data that do not agree with the specifications on the rating
plate, please contact the manufacturer.
oThe pump is designed specially for the operating pressure named by the customer. If the actual op-
erating pressure deviates notably from this design pressure, damage to the pump can also arise
within the specified operating limits. This applies both to notably higher as well as to notably lower
operating pressures. Under no circumstances may the minimum pressure lie below 2bar. In case
of any doubt, please contact the manufacturer.
2.2 Foreseeable misuse
oAny use that extends beyond the proper use or any other use is misuse.
oThe product is not suitable for pumping liquids outside the operational limits.
oAny bypassing or deactivation of safety equipment during operation is prohibited.
2.3 Obligations of the operator-owner
The operator-owner is the person who operates the product commercially or permits a third party to
use it and who bears the legal responsibility for the product, the protection of the personnel and third
parties during its operation.
The product is used in industrial applications. The operator-owner is therefore subject to the statutory
obligations concerning occupational health and safety.
In addition to the safety instructions in these instructions, the regulations on safety, accident prevention
and environmental protection respectively valid for the range of application of the product are to be ob-
served.
This results in the following obligations for the operator-owner:
oObserve the rules and regulations such as national standards, international standards and provi-
sions applicable at the site of use.
oObserve the obligations arising from occupational safety and from safety, accident protection and
environmental protection.
oDraw up a hazard assessment for the utilization of the product at the site of use.
oDraw up the operating guidelines for the operation of the product on the basis of the hazard assess-
ment.
oKeep the operating guidelines up-to-date during the entire operating life of the product, by ensuring
that the current version of the applicable rules and regulations are integrated.
oEnsure the qualification, instruction, information on dangers as well as regular training of the per-
sonnel.
oSpecify clear responsibilities for all work on the product, for example for the installation, operation,
maintenance, troubleshooting.
oKeep the operating instructions available at the site of use - also for future use.
oEnsure that the operating instructions as well as the associated documents are read, understood
and observed by the personnel.
oObserve the safety regulations for handling dangerous pumped liquids and comply with the safety
data sheets. Pumped liquids can, for example, be hot, poisonous, combustible and caustic.
oMake personal protective equipment available and instruct their use.
oEquip systems with an increased potential of danger with protective equipment and/or alarm equip-
ment. The failure of a component may not result in injury and/or damage to property.
oMaintain and check protective equipment and alarm equipment regularly.
oEnsure the technically flawless state of the product during its entire operating life.
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2 Safety
2.4 Safety instructions
2.4 Safety instructions
2.4.1 Fundamental safety instructions
The following safety instructions must be observed strictly:
oRead these operating instructions carefully and observe them.
oRead the operating instructions of the components carefully and observe them.
oHave work only carried out by qualified personnel/trained personnel.
oWear personal protective equipment and work carefully.
oPumped liquids can be subject to high pressure and can result in personal injury and damage to
property in case of incorrect operation or damaged components.
oPumped liquids can be hot, poisonous, combustible and caustic. Use corresponding protective
equipment.
oObserve the associated data sheets and safety regulations when handling dangerous materials.
oAvoid skin contact with system parts carrying liquids at operating temperatures exceeding 60°C.
oCollect any discharging pumped liquid safely and dispose of it in an environmentally compatible
manner in accordance with the applicable local regulations. Neutralize residues.
oKeep the mounting surfaces, scaffolding, ladders, lifting platforms and tools clean in order to pre-
vent slipping or stumbling.
oIf pressurized or energized components are damaged, shut down the pump immediately. Replace
the components or pump.
2.4.2 Dangers during transportation
The following safety instructions must be observed:
oHave all work only carried out by authorized transport personnel.
oUse intact and correctly dimensioned hoisting equipment.
oEnsure that the means of transport is in a flawless state.
oEnsure that the centre of gravity of the load is taken into consideration.
oDo not stand under raised loads.
2.4.3 Dangers during storage
The following safety instructions must be observed:
oObserve the storage conditions.
2.4.4 Dangers during installation
The following safety instructions must be observed strictly:
oHave all work carried out only by authorized qualified personnel.
oBefore installation ensure that the operating limits, NPSH values and ambient conditions are ob-
served.
oObserve the tightening torques Ä Appendix,Page59.
oEnsure that all the components can be accessed and that maintenance work can be carried out
easily.
2.4.5 Dangers during removal
The following safety instructions must be observed strictly:
oHave all work carried out only by authorized qualified personnel.
oBefore beginning work, let the pump unit cool down to the ambient temperature.
oCollect any discharging pumped liquid safely and dispose of it in an environmentally compatible
manner in accordance with the applicable local regulations.
oEnsure that the collection tank for discharging pumped liquids is sufficiently large.
Operating instructions OIL 01en-GB Edition 2019-03 7

2 Safety
2.4 Safety instructions
2.4.6 Dangers during connection work
The following safety instructions must be observed strictly:
oHave all work on the pump and pipe system only carried out by authorized qualified personnel.
oEnsure that impurities cannot get into the pump and pipe system.
oEnsure that mechanical connections are mounted stress-free.
oObserve the tightening torques Ä Appendix,Page59.
oHave all the work on the electrical equipment only carried out by electricians.
oBefore beginning work on the pump ensure that the electrical power supply is deenergized and is
secured against being switched back on.
oIf the insulation of the electrical cables or wires is damaged, disconnect the power supply immedi-
ately.
2.4.7 Dangers during operation
The following safety instructions must be observed strictly:
oHave all work carried out only by authorized qualified personnel.
oBefore commissioning ensure that a safety valve has been installed in the pipe system on the
pressure side before the first shut-off device.
oBefore commissioning, make sure that the suction line and pump are filled.
oPumped liquids can be hot, poisonous, combustible and caustic. Use corresponding protective
equipment.
oEnsure that the pump station is only operated within the operating limits.
oDuring a standstill ensure that the pressure in the pump does not exceed the inlet pressure.
oEnsure that during cooling down or heating up the pump is only subjected to slow temperature
changes.
oEnsure that existing safety equipment is not bypassed or activated during operation.
oBefore decommissioning ensure that the electrical power supply is deenergized and is secured
against being switched back on.
2.4.8 Dangers during servicing
The following safety instructions must be observed strictly:
oHave all work carried out only by authorized qualified personnel.
oBefore beginning work on the pump ensure that the electrical power supply is deenergized and is
secured against being switched back on.
oBefore beginning work, let the pump unit cool down slowly to the ambient temperature. Avoid
rapid temperature changes.
oPumped liquids can be hot, poisonous, combustible and caustic. Use corresponding protective
equipment.
oEnsure that the pump is depressurized and that shut-off devices are not operated uncontrolled.
oCollect any discharging pumped liquid safely and dispose of it in an environmentally compatible
manner in accordance with the applicable local regulations.
oEnsure that the collection tank for discharging pumped liquids is sufficiently large.
oObserve the tightening torques Ä Appendix,Page59.
oObserve the operating instructions and data sheets of the components.
2.4.9 Dangers during maintenance
The following safety instructions must be observed strictly:
oHave all work carried out only by authorized qualified personnel.
oBefore beginning work, let the pump unit cool down slowly to the ambient temperature. Avoid
rapid temperature changes.
oPumped liquids can be hot, poisonous, combustible and caustic. Use corresponding protective
equipment.
oCollect any discharging pumped liquid safely and dispose of it in an environmentally compatible
manner in accordance with the applicable local regulations.
oEnsure that the collection tank for discharging pumped liquids is sufficiently large.
oObserve the operating instructions and data sheets of the components.
8OIL 01en-GB Edition 2019-03 Operating instructions

3 Identification
3.1 Type code
2.4.10 Dangers during disposal
The following safety instructions must be observed strictly:
oNeutralize residues.
3 Identification
3.1 Type code
LFI - 42.ACAP.00001
1
2
3
4
5
6
7
Fig.1: Type code
Item Classification Description
1Type LFI oPump with free shaft end
oPump with inline flanges PN25/PN63
oPump unit with or without pump bracket foot
LFT oPump with free shaft end
oPump with overhead flanges PN25/PN63
oPump unit with or without pump bracket foot
LFM oPump with free shaft end
oPump with overhead flanges PN6/PN40
oPump unit with or without pump bracket foot
LFW oPump with free shaft end
oPump with overhead flanges PN25/PN40
oPump unit with or without pump bracket foot
LVI oPump with free shaft end and pedestal
oPump with inline flanges PN25/PN63
oPump unit on pedestal for vertical mounting
LVT oPump with free shaft end and pedestal
oPump with overhead flanges PN25/PN63
oPump unit on pedestal for vertical mounting
2Size Corresponds to delivery rate in [l/min] at
1450min-1
3Shaft seal A Standard mechanical seal
B Mechanical seal of hard material
C Standard radial shaft seal
D Magnetic coupling
F High-temperature radial shaft seal
H Mechanical seal balanced
X Special design
4Pressure stage overflow valve B Pressure stage 16.0– 39.9 bar
C Pressure stage 40.0– 64.0 bar
X Special design
5Heating A Without heating
B Electrical heating system
C Fluid heating system
X Special design
Operating instructions OIL 01en-GB Edition 2019-03 9

4 Technical data
3.2 Rating plate
Item Classification Description
6Completion P Pump with free shaft end
F Pump unit with pump bracket foot
V Pump unit without pump bracket foot
7Version index For internal administration
Tab.2: Type code
3.2 Rating plate
Typ | Type
Seriennr. | Serial no.
Tmin. / Tmax. ºC l/min
mm²/s
min-¹
bar
bar
KRAL AG, 6890 Lustenau, Austria www.kral.at
pD max. / ps max.
∆p
Jahr | Year
n
Q
Art.-Nr. | Item no.
Pumpen
1
2
3
5
4
10
7
9
8
6
Fig.2: Rating plate
1Construction year
2Max. operating overpressure
pressure-side/Max. operating
overpressure suction-side
3Temperature range
4Serial number
5Type
6Article number
7Differential pressure
8Nominal delivery rate
9Rated speed
10 Nominal viscosity
4 Technical data
4.1 Operating limits
Size
Parameter Unit 5–85
Max. operating overpressure
oPump with flange PN25/PN63 [bar] 63
oPump with flange PN6/PN40 [bar] 40
oPump with flange PN25/PN40 [bar] 40
Max. temperature of the pumped liquid
oStandard mechanical seal [°C] 150
oMechanical seal of hard material [°C] 180
oStandard radial shaft seal [°C] 80
oHigh-temperature radial shaft seal [°C] 150
Min. temperature for pump materials [°C] -10
Min.–max. ambient temperature [°C] -10...50
Viscosity min.–max. [mm2/s] 1.5–10000
Speed max.
oAt 50Hz [min-1] 2900
oAt 60Hz [min-1] 3500
Max. inlet pressure
oStandard mechanical seal [bar] 6
oMechanical seal of hard material [bar] 6
oMechanical seal balanced
Model LFI/LFT/LFW/LVI/LVT
Model LFM
[bar]
20
6
oStandard radial shaft seal [bar] 6
oHigh-temperature radial shaft seal [bar] 6
Tab.3: Operating limits
10 OIL 01en-GB Edition 2019-03 Operating instructions

4 Technical data
4.2 Sound pressure level
4.2 Sound pressure level
Guide values at 1 m distance, 1450 min-1, 20 bar
Size
5–54 55–84
Max. sound pressure level±3[dB(A)]
Pump 58.0 59.0
Motor 62.0 62.0
Pump unit 63.5 64.0
Tab.4: Sound pressure level
4.3 Required NPSH values
The following table lists the required NPSH values during operation with a low-volatile pumped liquid
such as lubricating oil or hydraulic liquid. When pumped liquids have a readily volatile component con-
tent, the required NPSH values increase notably:
oFuel oil requires an NPSH value of at least 6 mWC.
oIn the case of liquids that contain water (for example heavy fuel oil) the values in the table have to
be increased by the vapour pressure of the water at the specified operating temperature.
The required NPSH values also need to be increased if there are gas contents, regardless of whether
they are dissolved or not. In case of any doubt, please contact the manufacturer.
Size Viscosity NPSH values [mWC] at speed
[min-1]
Size Viscosity NPSH values [mWC] at speed
[min-1]
[mm2/s] 1450 1750 2900 3500 [mm2/s] 1450 1750 2900 3500
5 6 2.0 32 6 2.0
37 2.0 37 2.0
152 2.0 152 2.0 2.3 2.7
380 2.0 380 2.1 2.2 3.0 3.5
7.5 6 2.0 42 6 2.0 2.2 2.7
37 2.0 37 2.0 2.2 2.7
152 2.0 152 2.0 2.9 3.5
380 2.0 2.3 2.5 380 2.3 2.6 3.9 4.8
10 6 2.0 2.1 2.0 54 6 2.0 2.1 3.0 3.7
37 2.0 37 2.0 2.3 3.4 4.2
152 2.0 2.3 152 2.5 2.7 4.1 5.1
380 2.0 2.3 2.5 380 2.9 3.2 5.0 6.3
15 6 2.0 55 6 2.0 2.3
37 2.0 37 2.0 2.3
152 2.0 2.2 152 2.0 2.6 3.1
380 2.0 2.6 2.9 380 2.2 2.4 3.4 4.1
20 6 2.0 2.1 74 6 2.0 2.5 3.1
37 2.0 2.1 37 2.0 2.5 3.0
152 2.0 2.4 2.8 152 2.0 2.1 3.3 4.1
380 2.1 2.3 3.1 3.7 380 2.5 2.8 4.4 5.6
26 6 2.0 2.2 2.7 85 6 2.0 2.8 3.4
37 2.0 2.2 2.7 37 3.1 3.8
152 2.0 2.9 3.5 152 2.0 2.3 3.7 4.7
380 2.3 2.6 3.9 4.8 380 2.6 3.0 5.0 6.5
Tab.5: Required NPSH values
Operating instructions OIL 01en-GB Edition 2019-03 11

4 Technical data
4.4 Weights
4.4 Weights
Model type LFI/LFM/LFT/LFW
Size of
motor
Size of pump
5
7.5
10
15
20
26
32
42
54
55
74
85
Weight of pump with free shaft end [kg]
9.0 16.0 20.0 33.0
Weight of pump bracket with pump bracket foot, coupling and screws [kg]
71 2.0 – – –
80 2.5 3.0 – –
90S 2.5 3.5 3.5 –
90L 2.5 3.5 3.5 –
100L 4.0 4.5 4.5 5.5
112M 4.0 4.5 4.5 5.5
132S – 7.0 7.0 7.0
132M – 7.0 7.0 7.0
160M – 9.0 9.0 10.0
160L – 9.0 9.0 10.0
Tab.6: Weights type LFI/LFM/LFT/LFW
Model type LVI/LVT
Size of
motor
Size of pump
5
7.5
10
15
20
26
32
42
54
55
74
85
Weight of pump with free shaft end [kg]
9.0 16.0 20.0 33.0
Weight of pedestal [kg]
2.0 2.0 3.0 3.0
Weight of pump bracket with coupling and screws [kg]
71 1.5 – – –
80 1.5 2.0 – –
90S 1.5 2.5 2.5 –
90L 1.5 2.5 2.5 –
100L 3.0 3.5 3.5 4.5
112M 3.0 3.5 3.5 4.5
132S – 5.0 5.0 5.0
132M – 5.0 5.0 5.0
160M – 6.0 6.0 7.0
160L – 6.0 6.0 7.0
Tab.7: Weights type LVI/LVT
12 OIL 01en-GB Edition 2019-03 Operating instructions

5 Function description
4.5 Materials
4.5 Materials
Part Material designation Material number
Pump housing EN-GJS-400-15 5.3106
Seal housing EN-GJS-400-15 5.3106
End cover 16MnCrS5 1.7139
Screw set 16MnCrS5 1.7139
Tab.8: Materials
4.6 Accessories
Notice The technical data of the accessories are specified separately Ä Accessories,Page47.
5 Function description
5.1 Pump structure
10
11
12
13
21 4 6
8
3 75
9
Fig.3: Pump structure
1Idle screw 8Ball bearing
2Pump housing 9Shaft end pump (main screw)
3Relief line 10 Overflow valve
4Balancing cylinder 11 Screw plug
5Screw plug 12 Balancing bush
6Shaft seal (mechanical seal) 13 End cover
7Seal housing
Operating instructions OIL 01en-GB Edition 2019-03 13

5 Function description
5.2 Pump unit structure
5.2 Pump unit structure
14 15 16 17 18
Fig.4: Pump unit structure
14 Pump 17 Motor-side coupling half
15 Pump-side coupling half 18 Motor
16 Coupling intermediate ring
5.3 Functional principle
Screw pumps are rotating pumps. Their displacement effect results from three rotating screws1 and9
and the enclosing pump housing2.
Radial support of the screw set is effected through the sliding contact in the pump housing that de-
pends on lubrication by the pumped liquid. Screw pumps are therefore not suitable for dry running and
can only be used up to specific pressure limits and viscosity limits. Due to the narrow tolerances pump-
ing of suspended solids is not possible.
Axial support of the main screw9 is effected by a lifetime-lubricated ball bearing8. Various shaft
seals6 are available for sealing the main screw at the outlet from the housing. In order to reduce the
pressure at the shaft seal, a balancing cylinder4 is mounted at the main screw. The idle screws also
have an axial thrust relief through balancing bushes12 at the suction-side end of the screws and core
drilled holes to the pressure chamber. The sealing chamber is connected with the suction chamber via
a relief line3. An integrated overflow valve10 protects against excessive pressure that could cause
housing parts to burst.
The default direction of the rotation of the screw set is clockwise viewed from the motor 18 and is
marked on the pump flange by an arrow.
The flow direction is marked on the pump housing by two arrows.
14 OIL 01en-GB Edition 2019-03 Operating instructions

5 Function description
5.4 Housing variants
5.4 Housing variants
Housing Type Description
LFI/LVI Flange arrangement: Inline flange PN25/
PN63
LFT/LVT Flange arrangement: Overhead flange
PN25/PN63
LFW Flange arrangement: Overhead flange
PN25/PN40
LFM Flange arrangement: Overhead flange
PN6/PN40
Tab.9: Housing variants
5.5 Shaft seal
The following types of shaft seals are used:
oMechanical seal standard or hard material
oMechanical seal with quench
oRadial shaft seal standard or high-temperature
Mechanical seal standard/hard
material
The lubrication of the mechanical seal2 inevit-
ably results in a low leak, that as a rule vaporises
and is therefore not noticed. However, at low-
volatile liquids such as heavy fuel oil the leak be-
comes visible. The integrated leakage vent
holes3 allow draining of this leakage. The drain-
age through these holes has to be kept free. Dry
running must be avoided at all costs, as the seal
will overheat and be destroyed in a matter of
minutes.
24
3
5
2Mechanical seal
3Leakage vent hole
4Ball bearing
5Main screw
Radial shaft seal standard/high-
temperature
2
3
4
1
5
Depending on the material used, radial shaft
seals can be used for temperatures of up to
80°C or 150°C respectively. The used radial
shaft seal rings2 each have a lip used to seal
again liquid outlet and air inlet.
1Circlip
2Radial shaft seal ring
3Leakage vent hole
4Ball bearing
5Main screw
Operating instructions OIL 01en-GB Edition 2019-03 15

6 Transportation, storage
5.6 Overflow valve
5.6 Overflow valve
2
3
1
4
Fig.5: Overflow valve
1Screw plug
2Adjusting screw
3Pressure spring
4Valve body
The integrated overflow valve ensures that very high pressures that could result in housing parts burst-
ing do not arise.
The overflow valve is purely there as a safety element for the pump and should not be used for control
or regulation purposes such as maintaining pressure. If the valve is kept open for too long under ad-
verse operating conditions (high differential pressures and/or low viscosities) it will only take a few
minutes for the overflow valve and the valve seating to become damaged. As a result, the overflow
valve will leak permanently and there will be a corresponding reduction in the delivery rate. In addition
to this, circulation through the overflow valve for too long results in excess heating of the pump. This
reduces viscosity and can ultimately lead to pump failure.
It therefore has to be ensured through a safety valve at the system that the maximum operating pres-
sure always lies under the opening pressure of the overflow valve.
Notice The opening pressure of the overflow valve is set to 110% of the differential pressure in the factory.
The overflow valve is accessible through a screw plug1 and can be adjusted from the outside Ä Dur-
ing operation,Page28.
6 Transportation, storage
6.1 Dangers during transportation
The following safety instructions must be observed:
oHave all work only carried out by authorized transport personnel.
oUse intact and correctly dimensioned hoisting equipment.
oEnsure that the means of transport is in a flawless state.
oEnsure that the centre of gravity of the load is taken into consideration.
oDo not stand under raised loads.
6.2 Dangers during storage
The following safety instructions must be observed:
oObserve the storage conditions.
6.3 Unpacking and checking the state of delivery
Personnel qualification: oTrained personnel
1. Upon delivery check the pump/pump unit for damage during transportation.
2. Report damage during transportation immediately to the manufacturer.
3. Dispose of packaging material in accordance with the locally applicable regulations.
16 OIL 01en-GB Edition 2019-03 Operating instructions

6 Transportation, storage
6.4 Transporting the pump/pump unit
6.4 Transporting the pump/pump unit
Personnel qualification: oCrane operators, forklift operators
oTransport personnel
Personal protective equipment: oWork clothing
oProtective helmet
oProtective gloves
oSafety boots
Aids: oMobile crane, forklift
oHoisting equipment
WARNING
Risk of injury and damage to equipment through falling and toppling parts.
► Use intact and correctly dimensioned hoisting equipment in accordance with the total weight to be
transported.
► Select the lift points for the hoisting equipment in accordance with the centre of gravity and the
weight distribution.
► Use at least two load ropes.
► In the case of vertical transportation secure the motor against tippling.
► Do not stand under raised loads.
ATTENTION
Damage to equipment through improper transportation.
► Protect the pump against damage, heat, sunlight, dust and moisture.
Fig.6: Fastening of hoisting equipment - principle diagrams
1. Attach the hoisting equipment to the pump/pump unit and tighten. Ensure that the centre of grav-
ity lies exactly under the crane hook.
2. Lift the pump/pump unit carefully and put it down shock-free.
3. Before loosening the transport belts ensure that the pump/pump unit is secured against tilting.
6.5 Storing the pump
During the test run, the internal components of the pump are wetted with test oil, which has a preser-
vative effect. Pressure connection and suction connection are closed with protective caps. Unless oth-
erwise specified, the outer surfaces of the pump are preserved with a single-coat PU-based two-com-
ponent paint.
The preservative applied at the factory will protect the pump for about six weeks, if it is stored in a dry
and clean location.
Operating instructions OIL 01en-GB Edition 2019-03 17

7 Preservation
7.1 Preservation table
The manufacturer offers a long-term preservation for storage times of up to 60 months. The pump is
additionally packed in hermetically sealing anti-corrosion paper.
ATTENTION
Damage to equipment and corrosion if stored improperly and during longer standstills.
► Protect the pump against damage, heat, sunlight, dust and moisture.
► Protect against corrosion during longer standstill.
► Observe measures for storing and preservation.
1. Store cool and dry and protect against sunlight.
2. Ensure that the anti-corrosion paper is not damaged.
3. Observe the intervals for preservation Ä Preservation,Page18.
7 Preservation
7.1 Preservation table
Preservation has to be carried out additionally under the following conditions:
Type of delivery Condition
Standard delivery oStorage time exceeding six weeks
oUnfavourable storage conditions such as high humidity,
salty air, etc.
Delivery with long-term preservation oOpened or damaged packaging
Tab.10: Conditions for additional preservation
7.2 Preserving the inner surfaces
Personnel qualification: oTrained personnel
Personal protective equipment: oWork clothing
oProtective gloves
oSafety boots
Aids: oPreservative (acid-free and resin-free oil)
1. Open the packaging carefully. If the pump is protected additionally by anti-corrosion paper, en-
sure that it is not damaged.
2. Close the suction connection of the pump with a blind flange.
3. Pour the preservative into the pressure connection until it reaches approx.2cm under the rim,
while slowly turning the main screw against the direction of rotation.
4. Close the pressure connection of the pump with a new blind flange.
5. Close the packaging carefully.
6. After about six months storage check the filling level of the preservative and if necessary top up.
7.3 Preserving the outer surfaces
Personnel qualification: oTrained personnel
Personal protective equipment: oWork clothing
oFace protection
oProtective gloves
oSafety boots
Aids: oCastrol Rustilo DWX 33 or other preservative offering compar-
able protection
1. Paint or spray the preservative onto all plain and unpainted parts.
2. At intervals of about six months check the preservation and if necessary repeat.
18 OIL 01en-GB Edition 2019-03 Operating instructions

8 Installation, removal
7.4 Removing the preservation
7.4 Removing the preservation
Personnel qualification: oTrained personnel
Personal protective equipment: oWork clothing
oFace protection
oProtective gloves
oSafety boots
Aids: oSolvent
oCollection tank
oSteam-jet cleaning device with wax-dissolving additives
CAUTION
Risk of injury through emitted preservative.
► Wear personal protective clothing during all the work.
► Collect any discharging preservative safely and dispose of it in an environmentally compatible
manner in accordance with the applicable local regulations.
1. Clean the outside of the pump with solvents, if necessary using a steam-jet cleaning device.
2. Remove the pressure-side blind flange carefully in order to reduce any pressure that may exist in
the pump.
3. Drain the pump, collecting the preservative in a suitable vessel.
4. Remove the blind flange on the suction side.
5. To remove the residual preservative, flush the pump with the pumped liquid.
8 Installation, removal
8.1 Dangers during installation
The following safety instructions must be observed strictly:
oHave all work carried out only by authorized qualified personnel.
oBefore installation ensure that the operating limits, NPSH values and ambient conditions are ob-
served.
oObserve the tightening torques Ä Appendix,Page59.
oEnsure that all the components can be accessed and that maintenance work can be carried out
easily.
8.2 Dangers during removal
The following safety instructions must be observed strictly:
oHave all work carried out only by authorized qualified personnel.
oBefore beginning work, let the pump unit cool down to the ambient temperature.
oCollect any discharging pumped liquid safely and dispose of it in an environmentally compatible
manner in accordance with the applicable local regulations.
oEnsure that the collection tank for discharging pumped liquids is sufficiently large.
8.3 Installing the pump
The pumps can be operated in horizontal and vertical installation position.
Notice Soiling in the pipe system impair the service life of the pump. If the pipe system is flushed using the
pump during the initial commissioning, an additional commissioning filter has to be installed temporarily
before the pump at the system (mesh width: 0.02mm).
Operating instructions OIL 01en-GB Edition 2019-03 19

8 Installation, removal
8.4 Removing the pump
WARNING
Risk of injury and damage to equipment through falling and toppling parts.
► Only fasten the pump on a stable load-bearing underground or stable load-bearing load support.
► Ensure that fastening elements and pipings are fastened sufficiently.
ATTENTION
Damage to motor through emitted pumped liquid.
► Do not install the pump above the motor.
ATTENTION
Damage to device through impurity in the pipe system.
► During welding work attach protective covers in front of the connecting flanges.
► Ensure when welding that welding beads and abrasive dust cannot get into the pipe system and
the pump.
► Ensure that a commissioning filter is installed when the pipe system is flushed and cleaned using
the pump.
1
2
Fig.7: Flow direction
1Pressure connection
2Suction connection
Requirement:
üPump connections protected against soiling, for example by using the protective cover mounted in
the factory
üIf required, hoisting equipment prepared
1. Bring the pump in the installation position, while observing the position of the motor and the ar-
rows for the flow direction on the pump housing (1pressure connection, 2suction connection).
2. Fasten the pump with fastening elements securely on the underground.
8.4 Removing the pump
Personnel qualification: oFitter
oElectrician
oCrane operators, forklift operators
Personal protective equipment: oWork clothing
oProtective helmet
oFace protection
oProtective gloves
oSafety boots
Aids: oMobile crane, forklift
oHoisting equipment
oCollection tank
20 OIL 01en-GB Edition 2019-03 Operating instructions