vertical immersion pump vtp-bbf

8/10/2019 Vertical Immersion Pump VTP-BBF

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MB 5 04 01 / 1

Improved changes are always reserved without notice.

JESCO DOSIERTECHNIK GmbH & Co. KG

GeneralVTP centrifugal pumps in block design (BBF) correspondto the system of two-pipe pumps.Basically these immersion pumps are single-levelimmersion pumps with vertical axis the main componentsof which are combined according to the proven modulesystem.The drive motor is located in the dry section above thefastening plate. The pump head is immersed in themedium.VTP-BBF immersion pumps are designed withoutbearings and are suited to convey low-viscosity,aggressive acidic, alkaline and solutions fromdepressurized tanks.The efficient immersion depth can be increased by max.300 mm by using a suction pipe. Furthermore the pump

head can be equipped with a coarse at the suctionconnector.

Constructional featuresVTP-BBF immersion pumps are characterized by their simple and sturdy design. The immersion pipe is fittedwith a rigid supporting plate and thick sides. The sealingbetween spiral casing and immersion pipe is realized bya labyrinth seal.The hydraulic parts such as spiral casing, impeller, etc.are standard components from the standard pumpprogram.The drive motor (basic version according to IEC) isequipped with an extended shaft. Therefore it is not

necessary to provide the shaft with a bearing in the pumphead area so that dry running is prevented and operationis almost maintenance-free.

ApplicationsThere is a variety of possibilities to use vertical immersionpipes. They are generally suitable for applications whichdo not allow to convey the media from depressurizedtanks, basins and reservoirs with dry pumps due to thelocal constructional, physical or safety requirements. Themaximum operating temperature depends on theconcentration of the medium, a temperature of 80° Cmust, however, not be exceeded for the material PP.

Materials All parts in contact with the medium are made of PP,elastomers are of EPDM or FPM.

ShaftThe drive shaft of high-quality steel is coated with a PPshaft protection pipe in the area of the medium.

Impeller The impeller form is radial.The individual sizes are supplied with the followingimpellers: sizes 15-85, 20-120 and 25-135 in open form,all other sizes in closed form (open impellers on request).

Deliverypipe

Shaft withprotection

pipe

Metering head

Electric motor

Immersionpipe

Shaft seal

Inlet and outlet pipe connectionThe suction opening is located in the lower section of the pump, i.e.: the medium enters the pump body axially.The outlet pipe connection is situated in the dry sectionabove the tank cover.

DriveSurface-cooled three-phase motors according to IECstandard, 2900 rpm, protection class IP55, insulationclass F, mounting IM V1. The motor has an exendedshaft.



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MB 5 04 01 / 2



Type VTP 15 - 85 BBF

Förderhöhe

0

2

4

6

8

10

12

0,01 1 2 3 4 5

Förderstrom in m³/h

F ö r d e r h ö h e

i n m

W s

Wirkungsgrad

0,00

4,00

8,00

12,00

16,00

20,00

0,01 1 2 3 4 5


h y d . W i r k u n g s g r a d i n %

Leistungsbedarf

0

0,2

0,4

0,6

0,8

1

0,01 1 2 3 4 5


L e i s t u n g s b e d a r f i n k W

Motor kW: 0.37Speed: 2880

Flow rate

Efficiency

Power consumption

P o w e r c o n s u m p t i o n

i n k W

M e t e r s o f

h e a d

H y d . e f f i c i e n c y

i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 3



Förderhöhe

0

4

8

12

16

20

24

0,01 1,2 2,4 3,6 4,8 6 7,6 8


F ö r d e r h ö h e i n m

W s

Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

0,01 1,2 2,4 3,6 4,8 6 7,6 8



Leistungsbedarf

0

0,4

0,8

1,2

0,01 1,2 2,4 3,6 4,8 6


L e i s t u n g s b e d a r f i n

k W

Typ VTP 20 - 120 BBF


Flow rate

Efficiency

Power consumption


i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 4



Förderhöhe

0

5

10

15

20

25

0,01 7 10 15 20



W s

Wirkungsgrad

0,00

5,00

10,00

15,00

20,00

25,00

30,00

35,00

40,0045,00

0,01 7 10 15 20



Leistungsbedarf

0

0,5

1

1,5

2

0,01 7 10 15 20





Flow rate

Efficiency

Power consumption


i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 5



Förderhöhe

0

5

10

15

20

25

30

0,01 7 10 15 20 30 35



W s

Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

50,00

60,00

70,0080,00

0,01 7 10 15 20 30 35Förderstrom in m³/h


Leistungsbedarf

0

0,5

1

1,5

2

2,5

3

0,01 7 10 15 20 30 35





Flow rate

Efficiency

Power consumption


i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 6



Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

50,00

60,0070,00

0,01 5 10 15 20 25 30 35 40Förderstrom in m³/h


Leistungsbedarf

0

1

2

3

4

5

0,01 5 10 15 20 25 30 35 40



Förderhöhe

0

10

20

30

40

50

0,01 5 10 15 20 25 30 35 40



W s


Motor kW: 3Speed: 2880

Flow rate

Efficiency

Power consumption


i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 7



Förderhöhe

0

5

10

15

20

25

30

0,01 10 15 20 25 30 40 45



i n m

W s

Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

50,00

60,00

70,00

80,00

0,01 10 15 20 25 30 40 45



Leistungsbedarf

00,5

11,5

22,5

33,5

4

0,01 10 15 20 25 30 40 45



k W



Flow rate

Efficiency

Power consumption


i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 8





Förderhöhe

0

5

10

15

20

25

30

35

0,01 10 20 30 40 45



i n m

W s

Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

50,00

60,00

0,01 10 20 30 40 45



Leistungsbedarf

0

1

2

3

4

5

0,01 10 20 30 40 45



Flow rate

Efficiency

Power consumption


i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 9




Motor kW: 5.5

Speed: 2915

Förderhöhe

0

5

10

15

20

25

30

35

0,01 10 20 30 40 50 70 80



W s

Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

50,00

60,00

70,00

0,01 10 20 30 40 50 70 80



Leistungsbedarf

0

123

4567

0,01 10 20 30 40 50 70 80



k W

Flow rate

Efficiency

Power consumption

P

o w e r c o n s u m p t i o n

i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 10





Förderhöhe

0

5

10

15

20

25

30

35

40

45

50

0,01 10 15 20 30 40 45 50 60 70 80 90



i n m

W s

Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

50,00

60,00

70,00

80,00

0,01 10 15 20 30 40 45 50 60 70 80 90



Leistungsbedarf

0

2

4

6

8

10

12

0,01 10 15 20 30 40 45 50 60 70 80 90



Flow rate

Efficiency

Power consumption


i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 11




Motor kW: 7.5

Speed: 2930

Förderhöhe

0

5

10

15

20

25

30

35

0,01 20 40 60 70 80



i n m

W s

Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

50,00

60,00

0,01 20 40 60 70 80



Leistungsbedarf

0

2

4

6

8

10

0,01 20 40 60 70 80



k W

Flow rate

Efficiency

Power consumption

P o w

e r c o n s u m p t i o n

i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 12




Motor kW: 3

Speed: 1450

Förderhöhe

0

2

4

6

8

10

12

0,01 10 20 30 40 50 60 70



i n m

W s

Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

50,00

60,00

0,01 10 20 30 40 50 60 70



Leistungsbedarf

0

0,5

1

1,5

2

2,5

3

0,01 10 20 30 40 50 60 70



k W

Flow rate

Efficiency

Power consumption


i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 13



Förderhöhe

10

11

12

13

14

15

16

17

18

0,01 10 20 30 40 50 60 70



W s

Wirkungsgrad

0,00

10,00

20,00

30,00

40,00

50,00

60,00

70,00

0,01 10 20 30 40 50 60 70



Leistungsbedarf

3,2

3,4

3,6

3,8

4

4,2

4,4

0,01 10 20 30 40 50 60 70




Motor kW: 7.5

Speed: 1750

Flow rate

Efficiency

Power consumption


i n k W

M e t e r s o f

h e a d


i n %

Flow rate in m³/h

Flow rate in m³/h

Flow rate in m³/h



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MB 5 04 01 / 14



Dimensions of centrifugal pump

max. level

min. level

S e l e c t a b l e

i m m e r s i o n

d e p t h

3 0 0 . 4 0 0 . 5 0 0 m m

F l a n g e D I N 2 5 0 1 / P N 1 0

Type DN E + TT A B E F G e f

15 - 85 15 300 20 60 90 30 G 1 1/4 25 50

20 - 120 20 300/400 25 90 122 30 G 2 1/4 25 50

25 - 135 25 300/400 32 90 122 30 G 2 1/4 25 50

32 - 125 32 55 35 110 35 G 3 25 50

32 - 160 32 55 35 110 35 G 3 30 50

40 - 125 40 65 35 110 40 G 3 1/2 30 50

40 - 160 40 65 35 120 40 G 3 1/2 35 50

50 - 125 50 80 35 131 40 G 4 35 75

50 - 160 50 80 35 131 40 G 4 35 60

65 - 125 65 100 35 160 40 G 4 1/2 35 70

65 - 160 65 100 35 160 40 G5 35 70

65 - 200 65 100 35 144 40 G5 35 70

Immersion depth=E+TT



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MB 5 04 01 / 15



Dimensions of tank opening

min. requiredtank opening

Type D L R r b a

15 - 85 370 340 68 35 120 30

20 - 120 380 350 102 40 165 40

25 - 135 400 370 107 45 175 53

32 - 125 445 415 140 45 196 50

32 - 160 482 450 145 45 216 52

40 - 125 472 438 146 53 204 54

40 - 160 500 466 153 53 225 52

50 - 125 600 510 148 63 232 73

50 - 160 560 526 173 63 255 7165 - 125 600 550 180 73 274 100

65 - 160 650 600 190 73 293.5 100

65 - 200 660 630 200 73 318.5 113



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ET 5 04 01 / 1



Spare parts and wear parts

Item Description Material Qty Part numbers for pump type ...

15 - 85 20 - 120 25 - 135 32 - 125 40 - 125 50 - 125

1 Electric motor with shaft extension misc. 1 see motor type2 Intermediate piece GG/PP 1 52722 52292 52292 52251 52271 52555

3 Submersible pipe PP/Ms 1 52723 52597 52293 52252 52316 52582

3a Submersible pipe cover 1 52725 -- -- -- -- --

4 Shaft protection PP 1 52727 52578 68900 68901 68902 68903

5 Delivery pipe PP 1 52731 52715 52299 52259 52322 52589

6 Locking disc PP 1 52726 52304 52304 52263 52263 52281

7 Impeller kit EPDM/PP 1 50036 68907 68908 68909 68910 68911FPM/PP 1 -- 68917 68918 68919 68920 68921

8 Spiral casing PP 1 52224 50032 50034 50191 50199 52740

9 Suction connector PP 1 52730 52305 52305 52265 52328 52594

10 Flange PP 1 -- -- -- 52266 52266 52595

11 Lock nut PP 1 52733 52720 52307 52267 52329 52388

12 Flange PP 1 50059 50060 50061 50309 50310 50311

13 Barrier PP 1 -- 68927 68927 68928 68928 68929

14 Motor mounting kit VA 1 68932 68933 68933 68934 68935 68935

15 Intermediate piece mounting kit VA 1 68936 68937 68937 68938 68939 68940

16 Hex. screw PP 6 83786 83813 83813 83812 83812 83814

17 Sealing kit EPDM 1 68941 68942 68943 68944 68945 68946

FPM 1 68952 68953 68954 68955 68956 68957

18 V-ring FPM 1 -- 81705 81659 81659 81659 81702



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Spare parts and wear parts

Item Description Material Qty Part numbers for pump type ...

65 -125 32 - 160 40 - 160 50 - 160 65 - 160 60 - 200

1 Electric motor with shaft extension misc. 1 see motor type2 Intermediate piece GG/PP 1 52555 52271 52271 52271 52555 52555

3 Submersible pipe PP/Ms 1 52556 52272 92590 52373 52736 52759

4 Shaft protection PP 1 68904 68905 68905 68906 68904 68903

5 Delivery pipe PP 1 52564 52279 52322 52380 52564 52763

6 Locking disc PP 1 52570 52281 52281 52570 52570 52570

7 Impeller kit EPDM/PP 1 68912 68913 68914 68915 68916 68963FPM/PP 1 68922 68923 68924 68925 68926 68964

8 Spiral casing PP 1 52741 52284 52742 52743 52744 52765

9 Suction connector PP 1 52432 52282 50297 52386 50307 50408

10 Flange PP 1 52573 52283 52283 52387 52739 52766

11 Lock nut PP 1 52572 52267 52329 52388 52572 52572

12 Flange PP 1 50312 50309 50310 50311 50312 50312

13 Barrier PP 2 68929 68930 68930 68931 68929 68929

14 Motor mounting kit VA 1 68935 68935 68935 68935 68935 68935

15 Intermediate piece mounting kit VA 1 68940 68939 68939 68939 68940 68940

16 Hex. screw PP 8 83824 83814 83814 83814 83824 83843

17 Sealing kit EPDM 1 68947 68948 68949 68950 68951 68951

FPM 1 68958 68959 68960 68961 68962 68962

18 V-ring FPM 1 81702 81659 81659 81702 81702 81702



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This instruction manual should be read before installationand starting pump operation. Each JESCO pump isdesigned, tested and supplied according to the dataspecified in the order. If the operating conditions changeat a later date (e.g. other medium, viscosity, temperature,supply conditions, etc.), we must examine, and if necessary, confirm in each case if the pump can beoperated without modification. For damages which occur due to incorrect use or nonobservance of this instructionmanual, we take no liability.

GeneralPump descriptionVTP-BBF vertical immersion pumps are normal-suction,single-level, plastic centrifugal pumps in a vertical design.

The pumps of this series have been developed accordingto the requirements of the chemical industry and aremainly used to convey liquids which are pure or with alow solid content, acid or alkaline, and with a lowviscosity, from depressurized tanks.

The sealing between the spiral housing and the deliverypipe is ensured by a labyrinth seal.The drive motor (basic version according to IEC) isequipped with an extended shaft.

Prior to shipment each pump is subject to a functionaltest including measurement of the flow rate, head andthe power consumption of the motor.

Each pump has a label with the pump data and another one with the respective motor data. Please refer to theselabels when contacting us.

Operating and Maintenance Instructions

shaft seal

delivery pipe

shaft withprotection pipe

pump head

electricmotor

immersionpipe

Transportation und storageNo particular precautions are required for thetransportation and storage of plastic centrifugal pumpsunder normal conditions. At an ambient temperatureunder -10 °C, it is necessary to protect all pump partsfrom impact stress by appropriate packing. Theconnection (delivery side) and the suction opening of the pump must be closed. The pump must be stored sothat the delivery pipe of the pump is not stressed.

When starting up a pump which has been stored for several years, the following measures must be taken.

Test the elastomer seals for elasticity- replace if necessary.

WarrantyPrior to shipment each pump is subject to a functionaltest including measurement of flow rate, head and power consumption of the motor. A warranty regarding materialresistance can only be given if the exact operatingconditions were known during the design phase of thedevice.

Not included in the warranty are all sealing elementsand wear part as well as damages which result fromnonobservance of these operating and maintenanceinstructions.

Our «General Sales Conditions» have priority.



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Assembly and installationAssembly of the complete pump unitEach complete pump unit is carefully aligned and testedbefore leaving the factory. When installed in a system,the complete unit must be fastened on a flat, stablesurface (tank cover or bracket) with the respectivemounting holes.

Laying the pipesNominal diametersThe nominal diameter of the pipe must not be smaller than the pump connection. For short pipes, the nominaldiameter should be large enough to ensure least flowresistance. For long pipes, the most economical nominaldiameter must be determined in each case.

Changes in diameter or directionSudden changes in the diameter or direction as well asextremely sharp bends should be avoided. Flange sealsmust not protrude inwards.

Support und flange mountingThe pipe should be connected to the pump without stress.lt should be supported near the pump and should bescrewed on easily to prevent tension. After looseningthe screws, the flanges must neither be tilted nor separated and may not press against each other.

An y te ns io n wh ic h may oc cu r at the pipe s (e .g .temperature influences, etc.) should be kept from thepump body by taking appropriate measures - such as

installing compensators.

Cleaning the pipes before assemblyBefore final assembly all the pipe parts and valves shouldbe cleaned carefully.

Delivery pipesDelivery pipe diametersDelivery pipe diameters should be dimensioned so thatthe flow rate is in the range of 1-3 m/s. The optimumpipe diameter within this range must be determined ineach individual case.

Valves in the delivery pipeShut-off valve

A shut-off valve should be integrated in the deliverypipe close to the pump so that the flow rate can beregulated.

Back stopFor long delivery pipes or higher pressures, a back stopmust be installed. Thus, the pump is mechanicallyrelieved and the medium conveyed cannot run back inthe case of a standstill. This prevents damaging pressureimpacts on the pump and foot valve.

General safety information- The operational safety of the pump is only warranted

when the pump is used as intended.

- All the equipment to protect against accidental contact(coupling guard) must be mounted before operationof the pump.

- Leakage of environmentally hazardous media mustbe disposed of according to the legal requirements.

- Take the dangers of mounting and dismounting intoconsideration. Make sure that the pump standssecurely. Check that the parts are fastened toprevent falling. Support or adjust loose parts.

- Connecting flanges, drilled holes and other openingson the pump must be closed during transportation andstorage.

Attention: Eyebolts on pump parts and motors must notbe used to lift the completely assembled pump or theentire pump unit. The eyebolts are only for lifting thedetached single parts during assembly and disassembly.

EC - machine directive- Any work on the complete pump unit may only

be done by authorized specialists.

- According to the Machine Directive 89/392/EEC, thesepump units are not regarded as machines; they can,however, be built into installations which areregarded as machines. In such cases, observe thefollowing note.

«We distinctly emphasize that operation is prohibiteduntil it has been confirmed that the machine (plant)into which these products have been builtcorresponds to the requirements of the EC MachineDirective 89/392/EEC. A respective declaration of conformity may be requested».



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Electrical connectionThe electric motor mounted on the pump should beconnected according to the wiring instructions printedon the inside cover of the terminal box. In addition to theusual fuses, each pump motor must be protected with athermoswitch (see diagram). The external electricalconnection must be done by a specialist according tothe local regulations.

R T S R T SDirect start Star-triangle start

CommissioningPrior to operation- Remove any particles (solid matter) from the pipe.- Check pipe for leaks (pressure test).- Check if there is any stress on the pipe connections

to the pump- Check direction of rotation of complete unit (see

direction of rotation)- Remove delivery and suction stops- Fill tank before starting operation (minimum level)

Direction of rotationThe direction of rotation of the motor must coincide withthe directional arrow on the motor housing. The motor can be switched on briefly to check the direction of rotation. A wrong directionof rotation reduces the capacityand might damage the pump.

Start-upBefore start-up, check again if the system and the pumphave been satisfactorily filled and vented.

Motor switch-onShut-off valve on delivery sideImmediately after start-up, the shut-off valve on thedelivery side must be slightly opened so that, when thepump is started, the delivery line is properly vented.

Insufficient ventinglf the head does not increase with a higher speed, turnoff the pump and vent once more.

Adjusting output values After reaching operating speed, open the shut-off valveon the delivery side as far as necessary to reach therequired output values.

Operation with closed shut-off valveLonger operation with a closed shut-off valve on thedelivery side should be avoided by all means because,in addition to heating the medium conveyed, it mightdamage the pump.

Motor switch-off Delivery pipelf a non-return valve has been built into the delivery pipe,the shut-off valve can remain open. lf there is no non-return valve in the delivery pipe, the shut-off valve mustbe closed.

Motor Switch motor off.

Switching the pump on againBefore switching the pump on again, check if the pumpshaft has stopped. lf the shut-off valve in the deliverypipe leaks or is not completely closed, the backflow of the medium could cause the pump shaft to turnbackwards.

Changing the operating dataHigher density of the medium conveyedlf the density of the medium conveyed is higher thanindicated in the order or during the design phase of thepump, it is absolutely necessary to make sure the motor is not overloaded.

For longer interruptions in operationlf, in the case of longer interrutpion, the concentrationmay change or the medium may crystallize, the pumpmust be drained and rinsed with a preservative liquid.

MaintenanceMaintenance of the complete pump unit is limited toregular inspection of the following points:- Does the pump reach the required capacity (flow rate/

head)?- Does the pump or the motor emit any unusual

noises or vibrations?- Is the motor heat normal?



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max. level

min. level

Immersion depth=E+TT

S e l e c t a b l e

i m m e r s i o n

d e p t h

3 0 0 , 4 0 0 , 5 0 0 m m

F l a n g e D I N 2 5 0 1 / P N 1 0

Pumpegrösse DN E + TT A B E F G e f

15 - 85 15 300 20 60 90 30 G 1 1/4 25 50

20 - 120 20 300/400 25 90 122 30 G 2 1/4 25 50

25 - 135 25 300/400 32 90 122 30 G 2 1/4 25 50

32 - 125 32 55 35 110 35 G 3 25 50

32 - 160 32 55 35 110 35 G 3 30 50

40 - 125 40 65 35 110 40 G 3 1/2 30 50

40 - 160 40 65 35 120 40 G 3 1/2 35 50

50 - 125 50 80 35 131 40 G 4 35 75

50 - 160 50 80 35 131 40 G 4 35 60

65 - 125 65 100 35 160 40 G 4 1/2 35 70

65 - 160 65 100 35 160 40 G5 35 70

65 - 200 65 100 35 144 40 G5 35 70

Dimensions of centrifugal pump



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Dimensions of tank opening

min. requiredtank opening

Pumpegrösse D L R r b a

15 - 85 370 340 68 35 120 30

20 - 120 380 350 102 40 165 40

25 - 135 400 370 107 45 175 53

32 - 125 445 415 140 45 196 50

32 - 160 482 450 145 45 216 52

40 - 125 472 438 146 53 204 54

40 - 160 500 466 153 53 225 52

50 - 125 600 510 148 63 232 7350 - 160 560 526 173 63 255 71

65 - 125 600 550 180 73 274 100

65 - 160 650 600 190 73 293,5 100

65 - 200 660 630 200 73 318,5 113



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FTroubleshootingThe following chart is intended to help evaluate anypossible problems and their reasons. Shoud failuresoccur, which are not included or which cannot beremedied with the proposals given here, we recommendto contact your supplier.

Failure Cause Remedy

Pump does not convey Direction of rotation of motor is wrong Interchange the 2 supply mains.

The actual back pressure is greater thanthe max. pump pressure

Wrong pump size has been chosen. Uselarger pump.

Stop on the suction and deliveryconnections has not been removed

Remove stop.

Pump conveys too little Shut-off valve in delivery pipe has notbeen completely opened

Open shut-off valve completely.

Blockage in pipe or impeller Clean pipe and remove impeller, if required.

Geodetic head too highMay need larger impeller/inquire

Wrong pump size has been choosenRequest impeller or larger pump

Pipe resistance higher than expected Install pipe with larger diameter,Use larger Impeller or larger pump /inquire

Viscosity of the medium conveyed ishigher than expected

Dilute or preheat (observe max. workingtemperature).

Pump conveys too much The system head is less than the pumphead

- throttle the shut-off valve on the delivery side- install smaller impeller - possibly use smaller pump

Motor overloaded Pump conveys too much See "Pump conveys too much".

Particles in the pump Open the pump and clean it.

Density or viscosity of the mediumconveyed is too high

Check flow data.Mount larger motor.

vertical immersion pump vtp-bbf

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