a measured step forward - lutz-jesco america · characteristics of the pump and defined upon...

A measured step forward

Operations & Maintenance Manual

CENTRAN G2CENTRAN G2CENTRAN G2CENTRAN G2CENTRAN G2

TM

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Table of ContentsIdentification Codes ..................................................................................................................................................................................................... 6General Notes ............................................................................................................................................................................................................... 6Operating Principle ...................................................................................................................................................................................................... 6Motor ............................................................................................................................................................................................................................ 7Dry Running Survey ...................................................................................................................................................................................................... 7Instructions on Installation and Use ............................................................................................................................................................................ 7

Transport ............................................................................................................................................................................................................. 7Installation ......................................................................................................................................................................................................... 7Start-Up .............................................................................................................................................................................................................. 8Use ..................................................................................................................................................................................................................... 8Shutdown ............................................................................................................................................................................................................ 8

Maintenance ...................................................................................................................................................................................................................Dismantling ..........................................................................................................................................................................................................Inspection .............................................................................................................................................................................................................Assembly ..............................................................................................................................................................................................................

Safety Risks ................................................................................................................................................................................................................. 9Installation and Commissioning Personnel ...................................................................................................................................................... 9Operators and Maintenance Personnel .............................................................................................................................................................. 9Repair Personnel .............................................................................................................................................................................................. 10Waste Disposal ................................................................................................................................................................................................ 10

Improper Use ..................................................................................................................................................................................................................Operating Faults and Possible Causes ..........................................................................................................................................................................Technical Data ............................................................................................................................................................................................................ 11

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Tools

� Adjustable Wrench - 13 mm

Execution Notes� To facilitate the pump

disassembling operations,first disassembly theHydraulic Parts from theMotor Parts

� unscrew the connections(Pos.1)

� WarningWarningWarningWarningWarning! The disassemblyoperations of partsmagnetically connectedinvolve great opposedforces: keep the MotorParts fixed on floor duringthe removing of theHydraulic Parts.....

WARNING

The interventions must be performed under supervision of qualified personnel.

Before starting remember:

� cut off the power supply from the motor and disconnect the electrical wiring; pull the wires outfrom the terminal box and isolate their extremities accordingly

� close the suction and discharge valves; open the drain valve� use appropriate gloves, protective glosses and acid proof-clothing when disconnecting and

washing the pump� disconnect hydraulic connections: leave enough time for the residual liquid to exit the pump

casing and maintenance air to fill the empty volume� wash the pump before starting maintenance operations� do not scatter the washing liquid in the environment� before attempting to dismantle the pump ensure that its motor is disconnected and that it may

not be started accidentally� before the inspection, check that you have spare O-rings ready to hand for re-installing at the

end of operations� Warning!Warning!Warning!Warning!Warning! Operations near the magnets attract the tools. Proceed with caution to avoid

damages.

For further details see paragraph 9.1 “Disassembling”

Disassembling Steps Sequence


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2 Tools


Execution Notes� Disassemble keeping the pump in vertical position (suction on top)� unscrew the connections (Pos.2)



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2Tools

� Phillips Screw Driver� Punch x < 4mm


Execution Notes� unscrew the connections

(Pos.10)� remove the collar from the drive

magnet assembly using thepunch (see paragraph 9.1)



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Identification Codes

Each pump is supplied with the serial and model abbreviation andthe serial number on the rating plate, which is riveted onto thesupport side. Check data upon receiving the goods. Any discrepancybetween the order and the delivery must be reported communicatedimmediately.

In order to be able to trace data and information, theIn order to be able to trace data and information, theIn order to be able to trace data and information, theIn order to be able to trace data and information, theIn order to be able to trace data and information, theabbreviation, model and serial number of the pump must beabbreviation, model and serial number of the pump must beabbreviation, model and serial number of the pump must beabbreviation, model and serial number of the pump must beabbreviation, model and serial number of the pump must bequoted in all correspondence.quoted in all correspondence.quoted in all correspondence.quoted in all correspondence.quoted in all correspondence.

General Notes

CENTRAN G2 pumps are designed and built for the transfer of liquidchemical products having a specific weight, viscosity, temperature.These criteria must be appropriate for use with centrifugal pumps ina fixed installation, from a tank at a lower level to a tank or a pipeto a higher level. The characteristics of the liquid (pressure,temperature, chemical reactivity, specific weight, viscosity, vaportension) and the ambient atmosphere must be compatible with thecharacteristics of the pump and defined upon ordering.

The pump’s maximum performances (capacity, head, rpm) are definedon the identification plate.

CENTRAN G2 pumps are centrifugal, horizontal, single stage,coupled to a non-synchronous electric motor via a magneticcoupling, with axial inlet and radial outlet for connection to thehydraulic system. They are foot-mounted for floor mounting.

CENTRAN G2 pumps are not self priming.

R1-R2 execution CENTRAN G2 pumps can run dry.

The liquid to be pumped must be clean for the R1-2 execution. TheX1-2 execution may contain solid (%, dimension and solid parthardness must be agreed during the offer).

Pump rotation must be clockwise as observed from the motor end ofthe unit.

Make sure that the chemical and physical characteristics of theliquid have been carefully evaluated for pump suitability.

Verify the compatibility with the physical-chemical characterisitcsof the liquid.

The specific weight that can be pumped at a temperature of 25oC(both of the ambient and ot the liquid) depends upon the impellerdiameter (shown on the identification plate) and the type ofconstruction.

standard construction NNNNN (stamped on the rating plate) ........... 1.05 kg/dm3

powered construction PPPPP (stamped on the rating plate) ........... 1.35 kg/dm3

strong-powered construction SSSSS (stamped on the rating plate) .... 1.80 kg/dm3

The specific weight that can be pumped at 70oC is 10% less thanthat at 25oC.

The level of kinematic viscosity must not exceed 40 cSt so as notto significantly modify the pump’s performance. Higher values up toa maximum of 100 cSt are possible provided that the pump isequipped with suitable impeller to be defined upon ordering.

The maximum continuous working temperature referred to waterdepends on te choice of materials (specified on the identificationplate):

80oC (176oF) execution WR110oC (230oF) execution GF

The ambient temperature interval is related to the choice ofmaterials (specified on the identification plate):

0 - +40oC (14/104oF) execution WR-20 - +40oC (-4/104oF) execution GF

The maximum pressure the pump may be subjected to is 1.5 timesthe head valve developed with the outlet closed.

The vapour pressure value of the liquid to be pumped must exceed(by at least 1m w.c.) to the difference between the absolute totalhead (suction side pressure added to the positive suction head, orsubtracted by the suction lift) and the pressure drops in the suctionside piping (including the inlet NPSHr drops shown on the specifictables).

The pump does not include any check valve, any liquid flow control,or motor stop device.

Operating Principle

HYDRAULICALLY similar to all centrifugal pumps, this pump isequipped with a blade-type impeller rotating within a fixed housing.It has a tangential outlet (or radial with an internal deflector) and, bycreating a depression in the center, it allows the liquid to flow fromthe central suction side. Then, flowing through the impeller’s blades,the fluid acquires energy and is conveyed towards the outlet.

MECHANICALLY different from the traditional centrifugal pumps,impeller motion is created using the magnetic field between the


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primary outer magnet and theinner magnet (not visiblebecause housedinside theimpellerhub). Themagneticfieldcrosses theplasticparts andthe liquid,and firmlycouples thetwo magnetassemblies. Whenthe motor causes the outer magnet to rotate together with itshousing, the inner magnet assembly is dragged at the same speed.As a result the impeller, which is integral to it, is maintained inrotation.

The SHAFT, totally within the housing, is not involved in thetransmission of rotary motion; its only function is to act as acentering guide and support for the impeller. To this end thecomponents are designed so that a spontaneous cooling circuit (dueto a simple effect of pressure) is established to cool the surfacessubject to friction. Periodic inspections and cleaning prevent thebuild-up of sediments between the shafts and the guide bushessignificantly lengthening their working life.

Motor

Electrical Connections

The electrical connection to the motor terminal determines thedirection of rotation of themotor and can be verified by looking at thecooling fan at the rear of the motor (this has to rotate clockwiselooking at the motor fan end.)

With single phase motors the direction of rotation may be reversedby changing the wiring according to the motor data plate.

Dry Running Survey

Though the pump can run dry (execution R1-R2), it is stronglyrecommended to safeguard the pump and the plant by use of:

- in-line fluid pressure switch;- fluxmeter;- control devices for the motor power absorption.

Instructions on Installation and Use

Transport- cover the hydraulic connections- when lifting the unit do not exert force on the plastic fittings- lay the pump on its base or mounting plate during transport- protect the pump by means of adequate shock absorbing

supports as bumps and shocks may damage important workingparts vital for safety and functionality

Installation- check that bolts andnuts are correctly screwed (cfr. 9.3 page 12

“Assembly” for the right bolts torque setting), thermoplastics aredimensionally sensitive to sizeable temperature changes.

- clean the plant before connecting the pump.- make sure that no foreign bodies are left in the pump. Remove

safety caps from the hydraulic connections.- follow the instructions indicated in the following diagram:

1. YES: gate valve (may also be near pump in the case oflong piping)

2. With positive head: invert piping towards pump3. YES: line strainer (3-5 mm mesh)4. NO: air pockets: the circuit must be short and straight5. YES: pipe supports6. Fluid speed suction: 2.5 m/s7. YES: check valve (especially for long vertical or horizontal

pipes; compulsory with parallel pumps).8. YES: adjusting gate valve on outlet9. speed of delivered fluid: 3.5 m/s max.10. YES: in-line gauge or safety pressure switch11. NO: elbows (and other parts) on the pump (discharge and

suction lines)12. With negative suction lift: invert piping towards suction

tank13. YES: check valve (with negative suction lift)14. YES: strainer (3-5 mm mesh)15. Suction head varies according to flow in order to prevent

windage (min. 0.5 m, max. 15% of pump head)16. Suction head, 3 m max.17. Immersion depth: 0.3 m min.18. YES: pulsation dampener (indispensable with long pipes or

hot liquids) and/or anti-vibration discharge and suction;located near to pump

19. YES: drain pipe (completely sealed), drain valve. Shutduring normal operations

20. YES: overcoming obstacles at lower depths.21. Secure the pump by the mounting holes provided: the

supports must be level22. YES: drainage channel around base

- secure the pump to an adequate base plate having a mass atleast 5 times that of the pump

- do not use anti-vibration mounts to secure the pump- anti-vibration joints are recommended on the pipe connections- manually verify that all rotating parts are free to turn without


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abnormal friction by turning the motor cooling fan- make sure that the power supply is compatible with the data

shown on the pump motor identification plate- connect the motor to the power supply via a thermal control

switch- ensure that star-delta starting is implemented for motors whose

power is more than 15kW- install emergency stop devices to turn off the pump in case of

low liquid level (floating, magnetic, electronic, pressure-sensitive)

- ambient temperature as a function of the physical-chemicalcharacteristics of the liquid to be pumped and in any case notgreater or lower than the interval indicated in GENERAL NOTES

- other environmental conditions in accordance with the protectionof the motor

- install a drainage pit to collect any liquid overflow from the basedrainage channel due to normal operation and maintenance work

- leave enough free space around the pump for a person to move- leave free space above the pump for lifting operations- highlight the presence of aggressive liquids with colored tags

following the local safety regulations- do not install the pump (made in thermoplastic material) in

close proximity to heating system- do not install the pump in areas subject to solid or liquid matter

falling- do not install the pump in an explosive atmosphere unless the

motor and its coupling have been adequately pre-arranged- do not install the pump in close proximity to workplaces or

crowded areas- install extra protection guards for the pump or persons as the

need arises- install a spare equivalent pump in parallel

Start-Up- verify that the instructions outlined in the INSTALLATION have

been followed- verify that mounting elements (screws and bolts) are closed (see

bolt torque on page 13)- verify the correct direction of rotation (clockwise from the motor

fan side) supplying the motor with short impulses- ensure that the NPSH available is greater than that required by

the pump (in particular for hot liquids, liquids with high vaporpressure, very long suction pipes or negative suction lift)

- close the drain valve (pos. 19); totally flood the suction pipeand the pump

- start the pump with the suction valve completely open and thedischarge valve partially closed

- slowly regulate the flow by opening or closing the dischargevalve (never the suction valve). Make sure that the powerabsorbed by the motor does not exceed the rating indicated onthe motor identification plate

- do not operate the pump at the limit values of its performancecurve: maximum head (discharge valve excessively closed) ormaximum capacity (total absence of drops and geodetic head onthe discharge side)

- set the operating point to that for which the pump was requested- ensure that there are no abnormal vibrations or noise due to

inadequate mounting or cavitation- avoid short and/or frequent starts by properly setting the control

devices- ensure that the temperature, pressure and liquid characteristics

are as those specified at the time of order- WARNINGWARNINGWARNINGWARNINGWARNING! ! ! ! ! At the start-up be sure that all the internal hydraulic

parts are not in CCW rotation (the cooling fan of the motor muststand or CW rotate), to prevent decoupling among magneticdriven parts of the pump; if the CCW rotation is due to the feed-back of the liquid in the discharge side, add a no-return valve inthe plant.

Use- switch automatic control on- do not activate valves during pump operation- risks of dangerous water hammer effects in case of sudden or

improper valve actuation (only trained personnel should operatevalves)

- completely empty and wash the pump before using a differentliquid

- isolate or empty the pump if the crystallization temperature ofthe liquid is the same or lower than the ambient temperature

- stop the pump if the liquid temperature exceeds the maximumallowed temperature indicated in the general notes; if theincrease is of approximately 20%, check internal parts

- close the valves in case of leaks- wash with water only if compatible with the chemical being

used. Alternatively, use an appropriate solvent that will notgenerate dangerous exothermal reactions

- contact the liquid supplier for information on the appropriate fireprecautions

- empty the pump during long periods of shutdown (in particularwith liquids which easily crystallize)

Shutdown- disconnect the motor- before starting maintenance, turn off the suction and discharge

valves


Maintenance

All these maintenance operations must be performed under thesupervision of qualified personnel

- make periodic inspections (2 to 6 months depending on the typeof liquid and the operating conditions) on the rotating parts of thepump; clean or replace as necessary

- make periodic inspections (3 to 5 months depending on the typeof liquid and the operating conditions) on the functionality of themotor control system; efficiency must be guaranteed

- make periodic inspections (2 to 30 days depending on the typeof liquid and the operating conditions) of the in- line and footfilters as well as of the bottom valve

- the presence of liquid below the pump could be a clue to pumpproblems

- excessive current consumption could be an indication ofimpeller problems

- unusual vibrations could be due to unbalanced impeller (due todamage or presence of foreign material obstructing its blades)

- reduced pump performance could be due to an obstruction of theimpeller or damages to the motor

- motor damage could be due to abnormal friction within the pump- damaged parts must be replaced with new original parts- the replacement of damaged parts must be carried out in a clean

dry area

Disassembly- Tools required: size 10 mm -13 mm adjustable wrench, scew

driver (Phillips drive type), punch x < 4mm. Bolts have right-hand thread

- all these maintenance operations must be performed undersupervision of qualified personnel

- remove the power supply from the motor and disconnect theelectrical wiring; pull the wires from the terminal box andisolate them accordingly

- close the suction and discharge valves and open the drain valve- use gloves, safety glasses and acid-proof overalls when

disconnecting and washing the pump- disconnect the piping and leave enough time for the residual

liquid to exit the pump body and atmospheric air to fill theempty volume

- wash the pump before carrying out any maintenance work- do not splash the liquid in the environment- before attempting to dismantle the pump ensure that its motor is

disconnected and that it cannot be started accidentally- before the inspection, check that you have spare O-rings ready

to hand for re-installing at the end of operations- WarningWarningWarningWarningWarning: tools are attracted by operations near the magnet.

Proceed with caution to avoid damage.- as described in paragraph No. 2 “Disassembling sequence”,

unscrew the connections (Pos.1) and remove the Hydraulic Partsfrom the Motor Parts

- proceed seperately to disassemble the Hydraulic Parts or theMotor Parts following the sequence described in paragraph No. 2”Disassembling sequence”.

- WarningWarningWarningWarningWarning: the disassembly operations of parts magnetically

connected involve great opposing forces; keep Motor Parts fixedon the floor while removing Hydraulic Parts

- to facilitate the disassembly operations keep the pump invertical position (suction on top) Fig. 9.1 B.

- WarningWarningWarningWarningWarning: During the disassembly of the hydraulic parts do notbump the guide components.

- WarningWarningWarningWarningWarning: After the dismantling of the pump casing extracttogether the impeller and the central disc; extract avoidingradial movements. Fig. 9.1 C.

- disassemble the MOTOR PARTS: unscrew the 4 Phillips drivescrews inside the drive magnet assembly, Pos. E in Fig. 9.1 D.

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2 - WarningWarningWarningWarningWarning: During the use of screw driver inside the drivemafgnet assembly you must oppose the magnetic attraction

- WarningWarningWarningWarningWarning: After unscrewing the 4 screws (Pos. E in Fig. 9.1 D)insert the punch x < 4mm inone of two extraction holes (Pos. Din Fig. 9.1 D) to remove the collar (Pos. C in Fig. 9.1 E) from theback and to allow the removing of the drive magnet assembly,sockets and collar (Pos. A, Pos. B, Pos. C in Fig. 9.1 E) from themotor shaft.

Inspection

Check:

- the pump shaft for cracks and excessive wear- guide bushing for excessive wear (≅ 5%)- counterthrust bushing for cracks or excessive wear- pump shaft clutch- that the guide bushing cooling circuit is not blocked- the impeller, volute and rear chamber for abrasion and corrosion- that the pressure balancing holes on the impeller blades are not

blocked- for lumps and clusters created by the pumped liquid (especially

at the bottom the rear chamber)- for infiltration of liquid into the chamber containing the inner

magnets- for abrasion on the external surface of the rear casing due to

rubbing of the outer magnets- replace broken, cracked or deformed parts.- reopen all the blocked pipes and eliminate any chemical

agglomeration.- clean all the surfaces before re-assembly, especially O-ring

seats to prevent the risk of drip leaks

Assembly- Tools required: size 10 mm - 13 mm adjustable wrench, Phillips

screw driver- Bolts have right-hand thread

Bolt torque setting: M4 M6 M8 M10 M12(reduce by 25% on plastic parts) Nm 4 14 24 25 40

- all these maintenance operations must be performed undersupervision of qualified personnel

- before the inspection, check that you have spare o-rings ready tohand for re-installing at the end of operations

- proceed seperately to disassemble the Hydraulic Parts or theMotor Parts following the reverse sequence described inparagraph No. 2 “Disassembly sequence.”

- : assemble the hydraulic parts to the motor parts onlyafter the complete assembly of these two sub-assembly groups.

- assemble the hydraulics and the motor parts, oppose themagnetic force keeping the hydraulic parts by the inlet andoutlet connectors

- : locate the strainer on the motor flange as shown inFig. 9.3 A

- the right location of the strainer allows the assembly of thehydraulic parts as shown in Fig. 9.3 B.

- if necessary insert sockets (Pos. B) in the back of the drive

magnet assembly (Pos. A) Fig. 9.3 C- the relative position of drive magnet assembly and sockets is

shown in Fig. 9.3 C (a and b planes)- insert the collar (Pos. C) on the back of the drive magnet

assembly keeping the side pump collar surface far as possiblefrom the plane e

- verify that the collar surface with visible brass inserts is motorside

- remove possible traces of grease from motor shaft- insert the assembled group (drive magnet assembly, sockets,

collar) on the motor shaft- after assembling on motor shaft verify the right position of

sockets Pos. B in drive magnet assembly Pos. A (referring toplanes a and b shown in Fig. 9.3 C)

- screw the 4 Phillips drive screws repeating the sequence E1, E2,E3, E4 and applying a torque ≅6 Nm


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2- at the end of the screwing operation the collar will be at about 3-4 mm from the ε plane shown in Fig. 9.3 C)

- WarningWarningWarningWarningWarning::::: during the Hydraulic Parts assembly keep the partsvertical

- assemble the central disc and impeller before inserting them inthe rear casing, Pos. F in Fig. 9.3 E

- WarningWarningWarningWarningWarning::::: There are magnetic attraction forces in actionassembling the central disc and impeller: avoid bump opponingmanual force

- avoid radial movements while assembling the sub-assemblycentral disc-impeller in the rear casing

- CENTRAN G2 pumps are provided with a bi-directional axialalignment system (patented system)

- WarningWarningWarningWarningWarning::::: verify that the value of the dimension Q shown in Fig.9.3 F is 3 mm

Safety Risks

WARNING! MAGNETIC FIELDS.Magnetic pumps contain some of the mostpowerful magnets in existence. Themagnets are positioned on the back of theimpeller and the outer magnet housing. Themagnetic fields may adversely affectpersons fitted with electronic devices (e.g.pacemakers and defibrillators). Suchpersons must not be allowed to handlemagnetic pumps and magnetic pumpcomponents. Individuals with internalsurgical clips, metallic wiring, or othermetallic prosthetic devices must not beallowed to handle magnetic pumps andmagnetic components.

WARNING! MAGNETICFORCE.Exercise extreme caution and followinstructions carefully during pumpassembly/disassembly. The strongmagnetic field can cause tools and parts toslam together, injuring hands and fingers.

WARNING! CHEMICALHAZARD.The pumps are designed to pump differenttypes of liquid and chemical. Follow thespecific instructions to decontaminateduring inspection or maintenance.

WARNING!Safety risks for personnel mainly arisefrom improper use or accidental damages.

These risks may be of an electrical natureas far as the non-synchronous motor isconcerned and may cause injury to hands ifworking on an open pump. Risks may alsoarise due to the nature of the liquidspumped. It is therefore of utmostimportance to closely follow all theinstructions contained in this manual so asto eliminate the causes that may lead topump failure and the consequent leakage ofdangerous liquid for both personnel and theenvironment.

Risks may also arise from impropermaintenance or dismantling practices.


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In any case five general rules are important:

1. all services must be carried out by specialized personnelor supervised by qualified personnel depending on the typeof maintenance required

2. install protection guards to prevent liquid sprays (when thepump is not installed in remote areas) due to anaccidental pipe rupture. Arrange for safety basins tocollect possible leakage

3. when working on the pump always wear adequate personalprotective clothing

4. arrange for proper conditions for suction and dischargevalve closing during disassembly

5. make sure that the motor is completely disconnectedduring disassembly.

Proper design and construction of ``plants, with well positioned andwell marked piping and shut-off valves, adequate passages andwork areas for maintenance and inspection are extremely important.Pressure developed by the pump could damage the plant as a resultof faulty installation or normal operational wear and tear.

It must be stressed that the major cause of pump failures leading toa consequent need for repair is due to the pump running dry inmanually operated plants. This is generally due to:

- the suction valve being closed at start-up or- the suction tank being emptied without stopping pump operation

Installation and Commissioning Per-sonnelInstallation must be performed by qualified personnel who areproperly trained in their fields.They may eventually delegate toothers some operations depending on specific evaluations (technicalcapability required: specialization in industrial plumbing or electricsystems as needed).

Operators and Maintenance PersonnelOperations allowed to be performed by general operators (aftertraining on the correct use of the plant) include:

- pump starting and stopping- opening and closing of valves with the pump at rest- emptying and washing of the pump body via special valves and

piping- cleaning of filtering elements

Operations allowed to be performed by qualified personnel(technical capabilities required: general knowledge of themechanical, electrical and chemical features of the plant being fedby the pump and of the pump itself) include:

- verification of environmental conditions- verification of the condition of the liquid being pumped

- inspection of the control/stop devices of the pump- inspection of the rotating parts of the pump- trouble shooting

Repair PersonnelOperations allowed to be performed by general operators under thesupervision of qualified personnel include:

- stopping of the pump- closing of the valve- emptying of pump body- disconnection of piping from fittings- removal of anchoring bolts- washing with water or suitable solvent as needed- transport (after removal of electrical connections by qualified

personnel)

Operations allowed to be performed by qualified personnel(technical capabilities required: general knowledge of machiningoperations, awareness of possible damage to parts due to abrasionor shocks during handling, know-how of required bolt and screwtightening required on different materials such as plastics andmetals, use of precision measuring instruments) include:

- opening and closing of the pump body- removal and replacement of rotating parts

Waste DisposalMaterials: separate plastic from metal parts. Dispose of byauthorized companies.

Improper UseThe pump must not be used for purposes other than the transfer ofliquids.

The pump cannot be used to generate isostatic or counter pressures.

The pump cannot be used to mix liquids generating an exothermal reaction.

The pump must be installed horizontally on a firm base.

The pump must be installed on a suitable hydraulic plant with inletand outlet connections to proper suction and discharge pipes.

The plant must be able to shut off the liquid flow independently fromthe pump.

Handling of aggressive liquids requires specific technicalknowledge


Troubleshooting

Condition: Pump does not deliver1. motor rotates in wrong direction2. suction pipe is excessively long3. insufficient geodetic pump head or excessive suction geodetic

lift4. air infiltration into the suction pipe or branches5. pump or suction pipe not completely covered by liquid6. impeller channels blocked by impurities7. check valve on discharge pipe jammed8. geodetic system height is greater than maximum potential pump

head9. impeller jammed by crystals or by melting of materials during

dry operation.10. suction line blocked by mud or other debris11. foot valve insufficiently immersed12. suction valve faulty, thereby causing suction valve to empty

when pump stops13. magnets release a much greater specific weight and flow rate of

liquid than planned14. magnets release during start-up while impeller is CCW moving

(feed-back of the liquid in the discharge side)

Condition: Pump discharge rate or pressureinsufficientsee 01, 02, 03, 04, 05, 06, 10, 11, 12, 1315. system’s discharge head is greater than expected16. suction pipe, closing valve and other items have an insufficient

nominal diameter17. small geometric pump suction head18. damaged or worn impeller19. liquid viscosity greater than expected20. excessive air or gas in liquid21. elbow joints, check valves or other items restrict the outlet port

flow22. liquid (especially if hot) with tendency to change into gaseous state

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2Condition: Pump absorbs too much powersee 1923. pump operates at greater capacity than expected24. specific weight of liquid is greater than expected25. impurities inside pump create abnormal wear26. electric motor supply voltage is not rated voltage

Condition: Pump vibrates and is noisysee 2527. operates at full capacity (no head)28. pump or pipes inadequately supported29. eccentric impeller operation because of worn bushings

Condition: Pump’s internal parts wear out tooquicklysee 2530. liquid excessively abrasive31. recurring cavitation problems (see 02, 15, 19, 17)32. high tendency of liquid to crystallize or polymerize when pump

is not operating.33. pump made of materials that are unsuitable for pumped liquid34. operation with capacity reduced too much


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Lutz-JESCO America Corp. 55 Bermar Park Phone: +1-585-426-0990 E-Mail: [email protected] Toll Free:Rochester, NY 14624 USA Fax: +1-585-426-4025 Internet: www.jescoamerica.com 1-800-554-2762

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a measured step forward - lutz-jesco america · characteristics of the pump and defined upon...

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