Manual Vsc

7/31/2019 Manual Vsc

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DOC. NO. : VP-MM-010A/0

MANUAL FOR VSC PUMP

Instructions on Installations,

Operation and Maintenance of Horizontal Two Stage Split

Casing Centrifugal Pump

Manufactured By :

Varat Pump & Machinery Pvt. Ltd.20, Netaji Subhas Road, Kolkata – 700001

West Bengal, INDIA

Ph. No.: 033-2230 1903, 2243 4500

FAX No.: 033-2230 1535/6274

E-Mail : [email protected]



Page 1 of 14

1.0 GENERAL

1.1 This book let covers instructions for following Models of VARAT Horizontal Centrifugal Axial Split

Casing Pump Model:

80VSC-76

100VSC-76

100VSC 16

1.2 When the pumps are received sometime before the use of the pump it should be located in dry place.

The coupling should be rotated once in a month to prevent pilling of bearing surfaces.

1.3 When the pumps kept idle for a period after one use, it should be cleaned properly and overhauling

should be made before long storage.

2.0 INSTALLATION

2.1 LOCATION

The pump should be located as near the liquid source as possible. This will minimize the suction lift

and pump will give better performance.

Ample space should be provided on all the sides so that the pump can be inspected while in operation

and can be serviced conveniently whenever required.

2.2 FOUNDATION

The foundation should be sufficiently substantial to absorb any vibration and to form a permanent

rigid support for the base plate. This is important in maintaining the alignment of a direct connected

unit. A concrete foundation on a solid base is advisable. Foundation bolts of the proper size should

be embedded in the concrete located by a drawing or template. A pipe sleeve about two and one-half

diameter larger than the bolt should be used to allow movement for the final position of thefoundation bolts.

2.3 ALIGNMENT

Pumps and drivers that are supplied by the manufacturers, mounted on a common base frame are

accurately aligned before despatch. All base frames are flexible to some extent and alignments are

likely to be disturbed during transit to some extent and therefore must not be relied upon to maintain

the factory alignment. Re-alignment is necessary after the complete unit has been leveled on the

foundation and again after the grout has set and foundation bolts have been tightened. The alignment

must be checked after the unit is piped up and re-checked periodically.

2.4 LEVELLING

When the unit is received with the pump and driver mounted on the base plate, it should be placed on

the foundation and the coupling halves disconnected. The coupling should not be reconnected until

all alignment operations have been completed. The base plate must be supported evenly and placed

closed to the foundation bolt. In each case, the supports should directly under the part base plate

carrying the greatest weight and spaced closely enough to give uniform support. A gap of about 25 to

50 mm should be allowed between the base plate and foundation of grouting. Supporting will be

such that it will not be distorted or sprung by the uneven distribution of the weight. Adjust the

wedges until the shafts of the pump and driver are in level. Check the coupling faces, suction and

discharge flanges for the horizontal or vertical position by means of spirit level.



Page 2 of 14

2.5 FLEXIBLE COUPLING

A flexible coupling will not compensate for misalignment of the pump and driver shafts. The

purpose of the flexible coupling is to compensate for temperature changes and to permit the

movement of the shafts without interference with each other while transmitting power from the

driver to the pump.

2.6 MISALIGNMENT

There are two types of misalignment between the Pump shaft and the driver shaft:

(a) Angular misalignment: Shafts with axis concentric but not parallel.

(b) Parallel misalignment: Shafts with axis Parallel but not concentric.

The unit can then be grouted by soft concrete under the edges.

DIAL GAUGE ALIGNMENT

An approved method for putting the coupling halves in final accurate alignment is by the use of a

dial indicator. Check the alignment by straight edge and fillers as accurately as possible as described below. Fasten the indicator to the pump half of the coupling with the indicator button resting on the

other half of the coupling periphery (FIG 3). Set the dial to the 0 and chalk mark the coupling half

beside where the bottom rests. For any check, top or bottom or sides, rotate both shafts by the same

amount i.e. all readings on the dial must be made with bottom beside the chalk mark. The dials

reading will indicate whether the driver has to be raised or lowered or moved to either side.

Accurate alignment of shaft center can be obtained with this method.



Page 3 of 14

2.7 GROUTING

When the alignment is correct, the foundation bolts should be tightened evenly but not too firmly.

Working soft concrete under the edges can then grout the unit. Foundation bolts should not be fully

tightened until the grout is hardened, usually 48 hours after pouring.

2.8 PIPING

Both suction and delivery pipes and accessories should be independently supported near the pump so

that when the flange bolts are tightened no strain will be transmitted to the pump casing. It is usually

advisable to increase the size of both suction and delivery pipes at the pump nozzles in order to

decrease the loss of head from friction and for the same reason piping should be arranged with as

minimum bends as possible, as these should be made with a long radius wherever possible. The pipe

lines should be free from scales, welding residuals etc., and have to be mounted in such way that

they can be connected to suction and delivery flanges without any stress on the pump. Adequate

supports should be given to pipe lines so that the weight of the pipelines does not fall on the pump.

The use of minimum number of the bends and other fittings will minimize the friction losses.

2.9 SUCTION PIPE

The suction pipe should be as short as possible. This can be achieved by placing the pump close to

the liquid to be pumped. The suction pipe must be kept free from air leaks. This is particularly

important when the suction lift is high. A horizontal suction line must have a gradual rise towards.

To the pump. Any high point in the pipe will be filled with air and thus prevent proper operative of the pump. A concentric taper piece should not be used in a horizontal suction line as it forms an air

pocket in the top of the reducer and the pipe. Use an eccentric per piece (FIG. NO.- 4).

The end of the suction pipe must be well submerged to avoid whirlpools and ingress of air but must

be kept clear of any deposits of mud, silt grit etc. The pipe must be clear from any side of wall by at

least 450mm. The end of the suction pipe should be provided with a strainer of sufficient open area.



Page 4 of 14

2.10 DELIVERY PIPE

A check (non-return) valve and a gate or sluice valve-regulating valve) should be installed in the

discharge line. The check valve placed between the pump and the gate valve is to protect the pump

from excessive pressure and to prevent water running back through the pump in case of failure of the

driving machine i.e.-excessive backpressure.

Discharge piping should be provided with a sluice valve to control the discharge, if required. The

valve is used in primary, starting and when shutting down the pumps. If increases are used on thedischarge side to increase the size of discharge piping they should be placed between the check valve

and pump.

2.11 VACCUM EQUALIZING LINE (AND LIQUID LINE)

If the pump draws from system under vacuum a equalizing pipe must be carried from the highest

point of the suction line, however, as close to the suction flange of the pump as

Possible, to the top of the feed tank to keep gas bubbles that might have been entrapped in the flow

from entering the pump. The line should be fitted with an isolating valve, which should be closed

only for maintenance work on the pump set.

Apply sealing liquid (external sealing) to the shaft seal cage to prevent entry of air in the case of

pumps with packed stuffing box. It is convenient to tap the sealing liquid from the delivery line

above the non-return valve. Arrangement explained in FIG. NO.-5.

2.12 FOOT VALVE

It is advisable to install a foot valve to facilitate priming of pump. Foot valve should have sufficient

clear passage for water. Care must be taken to prevent foreign matter from being drawn into the

pump or choking the foot valve and for this purpose an efficient strainer should be provided.

2.13 STUFFING BOXES AND PACKING

Stuffing boxes should be carefully cleaned and the packing placed in them. Be sure that sufficient

packing is placed at the back of the water seal cage. If the water to be pumped is dirty or gritty,

sealing water should be piped to the stuffing boxes from clean outside source of supply in order to



Page 5 of 14

prevent damage to the packing and shaft. In placing the packing, each packing ring should be cut to

the proper length so that ends come together but do not overlap. The succeeding rings of packing

should be placed in the Stuffing Box so that the joints of the several rings of packing are staggered

and cutting the shaft. If the stuffing box is not properly packed, friction in stuffing box prevents

turning the rotor by hand. On starting the pump, Stuffing Box Packing should be left slightly loose

without causing an air leak, and if it seems to leak instead of putting too much pressure on the gland,

put some heavy oil in the stuffing box until the pump works properly and then gradually tighten up

the gland. The packing should be occasionally changed.

MECHANICAL SEAL (APPLICABLE FOR BALANCE SEAL)

Since mechanical seals are made in a wide variety of designs, the instruction for the specific seal

must be carefully studied and followed exactly. A Mechanical Seal is a precision device and must be

treated accordingly. If any leakage is found, observe carefully whether it is found :-

1) Between shaft & sleeve or

2) Between stuffing box flange and sleeve or

3) Between stuffing box and seal cover

For clause no.1 ‘O’ ring between shaft and sleeve are to be replaced.

For clause no.2 if adequate leakage from the sleeve surface is found then after inspection of the seal

face damage, compression of the seal is to be increased. Unscrewing 4 nos. align screws for holding

rotary part on the sleeve, you have to slide the seal rotary part towards the stationary part and

tightening the 4 nos. align screw can do this. You have to keep the compression of the seal about 3 to

4 mm. If the leakage is little then it is normally through the `O’ Ring provided inside the rotary seal.

The ring may be required to be replaced. For clause no.3 tighten the 4 nos. gland nut (No. 29), if any

further leakage found then seal cover ‘O’ ring/gasket (No.21) is to be replaced.

2.14 LUBRICATION

Pump is usually provided with grease cap. Initially fill up grease at grease cap provided at bearing

bracket.

2.15 BALL BEARING

Correct maintenance of ball bearings is essential. The bearing manufacturers give the following as

guide to relubrication periods under normal conditions.

Quarterly when on continuous duty.

Half yearly when on eight-hour per day duty.

The bearings and housings should be completely cleaned and recharged with fresh oil after 2500

hours or the nearest pump overhaul time.

2.16 PRIMING

No pumping action occurs unless the pump casing is filled with liquid. Pump casing and suction pipe

must therefore be completely filled with the liquid and thus all air removed before the pump is

started. Several different priming methods can be used depending on the kind of installation and

service involved.

(1) Liquid level above pump level.

Pump is set below liquid level of source of supply so that liquid always flows to pump under

positive head.

(2) Priming with Foot Valve.



Page 6 of 14

(a) When pump is installed on suction lift with foot valve at the end of suction line, fill

pump with water from some outside source till all air is expelled and water flows

through air vent.

(b) When there is liquid under some pressure in the discharge pipe, priming can be

effected by bypassing the pressure liquid around the check and gate valve. Of course,

the initial priming must be effected from some outside source.

NOTE: In this case, the foot valve must be capable of withstanding pump pressure and

possible surge.

(3) Priming by ejector: An ejector operated by steam, compressed air or water under pressure and

connected to air vent on top of casing can be used to remove air from and prime the pump on

suction lift installations.

(4) Priming by dry vacuum pump: A hand or power pump sucks in all the air from the casing and

the suction pipe, and thus primes the system

3.0 PREPARATION OF PUMP STARTING:

After the pump and the drive are mounted, the plant should be prepared for starting. The

following rules should be observed before starting the pump:

3.1 The pins are pad should be inserted into the coupling not before making sure of the correct

rotation of drive motor. In case of the drive rotating in the wrong direction, the connection of

two cable conductors supplying the current to the motor should be interchange in case of

DOL starting.

3.2 Check presence of oil in bearings and correct location of water deflector on shafts that ensure

flashing, quenching, lubrication in case of mechanical seal as well as if required as per

design.

3.3 Gland packing should be tightly stuffed, but not over tightened. The sealing packing should

be tightened to such an amount as to allow the pumping liquid to seek to the outside. Over

tightening of sealing packing causes quick wear out of shaft sleeves, increases its friction and

lowers the efficiency factor of the whole plant.

3.4 Check the free rotation of pump rotor, turning it by hand to verify any major obstruction or

friction with wearing parts.

3.5 Check the proper order of suction and pressure pipelines, tightening of flanges, fittings of

inlet valve and presence of drain plug, air cock for vent etc.

3.6 Check the correct direction of rotation of pump and drive. The pump rotor should rotateaccording to direction of rotation marked on pump.

3.7 Getting reasonably sure of the proper order of the whole plan and its readiness for operation,

the suction pipe should be primed with water / liquid. Arrangement for priming funnel and

three ways connection of pressure gauge with air-cock after delivery flange but before

delivery sluice valve is required.

3.8 The pump is being filled up (Primed) until the air-cock produces water jet without air

bubbles. Then the primary funnel, air-cock and sluice valve is required to be closed. After all

these operation and checking, the pump is ready for starting.



Page 7 of 14

4.0 STARTING AND STOPPING OF THE PUMP:

4.1 The pump should be loaded gradually, when the drive is engaged. When the prime movers

attain full speed, the regulating sluice valve should be smoothly opened. This will avoid

overloading of the drive.

4.2 On the other hand it should be kept in mind that a lengthy operation with completely close

sliding valve is likewise to be avoided, since this causes unnecessary heating of the liquid inthe pump.

4.3 By controlling the sliding valve the required flow and head may be obtained. After setting of

pressure gauge at required point, check ampere consumption. If found value exceeds required

value, pump should be stopped

5.0 BEARINGS:

The pump is supplied with anti-friction ball bearings at DE and angular contact ball back to

back at NDE (2 nos. Bearing to be provided as per drawing, keeping open side of two bearings outward) and Lock by bearing nut with lock washer as applicable. One thrust collar

ring inserted between bearing and shaft edge.

Generally SKF/NBC/RHP equivalent bearings are used.

6.0 LUBRICANT:

Bearings are normally grease lubricated. Bearing temperature is permissible to rise 40 degree

Centigrade above ambient temperature. Lithium based wheel bearing grease must be used of

reputed brand.

7.0 STUFFING BOX:

Stuffing Boxes are extra deep and suitable for balance mechanical seal. Mechanical seal must

be over oiled before starting the pump after long time storage.

8.0 GASKET

Compressed asbestos packing gasket for joining of volute casing is used. However, packing

gasket suitable to handle corrosive liquid and high temperature fluid is supplied against

specific requirements.

9.0 COUPLING

Normally pin bush type flexible coupling is used. Other type of coupling may be supplied

against specific requirements.

10.0 GUIDE RING / WEARING RING

Replaceable throat bush as guide ring and ring to protect the both side of impeller provided at

casing in VSC type pumps.



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11.0 SHAFT SLEEVES

Replaceable sleeve for protecting the shaft for gland packed pump and for balance seal, step

down sleeve is being provided.

12.0 SPARE PARTSOne set Anti-friction bearing, Wearing Ring, Shaft Sleeve, Gland Packing, Casing Gasket

must always be kept with the actual users of the pump to ensure uninterrupted service from

the pump.



Page 9 of 14

13.0 TROUBLE SHOOTING

SL.

NO.DEFECTS CAUSES REMEDY

1. Pump does

not deliver

liquid.

(1)Insufficient quantity of

water/water not filled in

pump casing

(1) Fill up pump casing

with clear water or liquid

to be pumped.

(2) Incorrect direction of

rotation.

(2) Change the direction of

rotation of prime mover.

(3) Pump is clogged. (3) Check up Impeller may

clog. Clean Suction pipe

and Strainer.

(4) Pump speed too low. (4) Check up speed of

prime mover and adjust.

(5) Suc. Lift too high. (5) Reduce Suc. Lift.

(6) Leakage in Suc. Pipe. (6) Prevent leakage in suc.

Pipe.

(7) Incorrect layout of Suc.Line.

(7) Correctly install theSuc. Line.

(8)Valve in Suc. Line not

open properly.

(8) Check up the opening

of line valve.

(9) Shaft Sleeve & Gland

packing worn and air leaks.

(9) Replace Shaft-Sleeve

& Gland Packings.

(10) Delivery liquid too

viscous.

(10) Liquid viscosity to be

checked & corrected.

(11) Incorrect selection of

pump for operating

condition.

(11) Replace the pump

with a suitable designed

capacity.

2. Flow not

adequate.

(1) Speed too low. (1) Check up speed of

prime mover and adjust.

(2) Leakage in Suction side

fitting and piping

(2) Prevent leakage in

suction pipe and fittings.

(3) Discharge Head too high. (3) Check up vertical head

and frictional losses.

(4) Pump Casing empty. (4) Fill up the pump

casing.

(5) Rubber Flap Valve

clogged.

(5) Check up rubber Flap

assembly & leakage from

pump casing.(6) Shaft Sleeve/Gland

packing worn and air leaks.

(6) Replace the shaft

Sleeve/Gland Packing.

(7) More clearance between

Impeller and Wearing Plate.

(7) Measure the clearance

between Impeller and

Wearing Plate and adjust

by using proper Packing.

(8) Suction lift too high or

suction pipe too long.

(8) Avoid High Suction

lift and Suction piping.



Page 10 of 14

SL.

NO.DEFECTS CAUSES REMEDY

3. Pump takes

more

Power.

1) Speed too high. (1) Check and correct the

speed.

(2) Head less than rating. (2) Provide minimum

head.

(3) Shaft Bent (3) Check and replace the

Shaft.

(4) Miss-alignment of the

set.

(4) Correct the alignment.

4. Rated

pressure not

developed.

(1) Prime mover not

running at rated speed.

(1) Check the speed of

Prime mover and correct

it.

(2) Leakage through Gland

Packing.

(2) Replace Gland

Packing.

(3) Too much clearance

between Impeller andWearing plate.

(3) Measure the clearance

between Impeller andWearing plate and adjust

by using proper packings.

5. Pump

vibrates and

makes more

noise.

(1) Pump casing not filled

with Water/Liquid (it is

only possible only during

priming time).

(1) Fill up the pump

casing.

(2) Suction lift too high. (2) Reduce the suction lift

or install the Foot valve.

(3) Miss- alignment (3) Correct the alignment.

(4) Foundation not rigid (4) Check up the

foundation bolt.(5) Shaft bent (5) Replace the shaft

(6) Bearing Worn out (6) Check & replace

Bearing.

(7) Lack of Lubrication (7) Lubricate the Bearings.

(8) Pump operating at very

low capacity.

(8) Reduce total head.

6. Bearings

have short

life.

(1) Miss- alignment (1) Correct the alignment.

(2) Shaft bent (2) Check the shaft

condition.

(3) Excessive Grease or lack of grease.

(3) Check up lubrication.

(4) Dirty water getting into

Bearings.

(4) Protect bearing neatly.



Page 11 of 14

14.0 MAINTENANCE

Preventative maintenance schedule are the periodical checks and precautions by which possibilities

of failures and breakdowns are made very remote.

14.1 Daily Checks

1.1 Pressure gauge reading1.2 Bearing temperature

1.3 Leakage through stuffing box

1.4 Noise and vibration

1.5 Voltage and current

1.6 Constant flow of cooling water.

14.2 Periodical Maintenance

1.1 Replace the grease for bearing lubrication

1.2 Change the stuffing box packing.

1.3 Check the alignment of the pump set

1.4 Calibrate the measuring instruments

1.5 Check the sealing and cooling connections etc.

15.0 OVERHAULING

Normally the pump will be due for overhauling after about 3000 working hours. Pump dismantling

and assembling should be done by skilled personal. Special attention should be given to continuous

running pumps & advice is to keep stand by pump for emergency services.

15.1 DISMANTLING OF PUMP:

1. Remove pressure gauge, grease pot, seal flash/gland cooling pipe, and other fittings.

2. The Design advantage of this VSC pumps is dismantling the pump for over oiling without

removing the suction & delivery flange connection can be done. If pin bush type coupling is

provided than remove pin-bush bolt by unscrewing it and remove pr. Gauge ,auxiliary fittings if

fitted with the pump

3. Remove bolt (no 27) and dowel pin provided to fixed up of bearing bracket of both side and pull

out the gland flange(no 28) after unscrewing the gland nut from both side so that it released

from the gland stud (no 29).

4. now remove dowel pin and bolts used to fixed up upper and lower casing. After removal of the

bolt use forcing thread bolt provided on upper casing. Start to tightening 4 nos. forcing boltgradually when upper half casing will be retouched from the lower half casing. Lift the upper

half straight vertically with the help of chain pulley.

5. After removal of upper half the total dynamic assembly is visible to you. Remove all the gland

packing and split lantern ring. Now lift out the shaft assembly fitted with impellers, wearing

rings, gland flange (if not split) and bearing housing . In case of mechanical seal pump special

are should be taken to protect face of seal during handling.



Page 12 of 14



Page 13 of 14

6. Now to dismantle the dynamic components, you have to pull out the bearing housing along with

bearing from driving end, remove the cod screw provided at coupling and take out pump

coupling half.

7. Detach both sides bearing cover of the housing by unscrewing bolt. Take out bearing from

housing by hammering gently with a socket on the centre rotary ring of the bearing. Take out

water deflector, gland flange, lantern ring, mechanical seal (if applicable unscrew 4 nos. codscrew provided to hold in directly on shaft. In case of balance seal will be provided on a sleeve

which you find screwed up with the shaft) and wearing ring.

8. To remove component from the non driving end you have to follow the same method but after

removal of bearing end cover you will find a bearing lock nut and washer. Unlock the clip of the

lock washer and than unscrew the lock nut.

9. After removal of components rest of parts are 2 nos impeller with sleeve and sleeve double (for

balance seal impeller lock nut and washer). For gland packing (for balance seal unfold the

tongue of both side lock washer) remove impeller / sleeve lock nuts by unscrewing it from both

side.

10. Pull out the pump impeller from either side and take out impeller distance piece. Remove

bearing lock nut before removal of the bearing from the shaft. Pull out bearings from the shaft

from both ends. If self align Bearing at NDE is

11. After removal of all above pump parts it is necessary to check up properly for any wear and tear

and if any parts are found to be worn out, the same should be replaced or rectified. Wearing

rings (Item no. 05) & guide bush (Item no.20) if required to be replaced.

15.2 REASSEMBLING OF PUMP :

Before reassembling all parts are to be cleared and it is advised to paint all the parts which are

without machined faces. Paints should be dry before reassembling. Bearings are to be cleaned

with petrol. All machined faces should be rubbed with Mobil-oil.

1. Assembly of pump starts with Fitting of dynamic assembly which includes fitment of impeller,

sleeve, bearing and bearing housing with shaft. First fixed up the impeller key and insert impeller

from both side of shaft keeping impeller distance piece in the center between the two impellers.

Don’t forget to take care about direction of rotation of impeller. After fixed of impeller Insert

sleeve from both side and than sleeve nuts. Some of pumps are designs with threaded sleeve.

(for balance Mech. Seal, insert impeller lock nut with washer ) than tighten the nuts from both side(not full tight ,final adjustment may be done latter on after fixed up bearing housing. Next provide

throat bush for stuffing box, lantern ring, (mechanical seal with sleeve for balance seal), gland

flange (don’t forget to place gasket of gland flange for mech. Seal) , and water thrower one by one.

Like wise same items are also to be inserted from driving end. For mechanical seal pump, seal

cover is to be fitted with stationary part of the seal by hand press fit providing ‘O’ ring for it.

2. Now press fit 2 nos. angular contacts bearing back to back with the NDE bearing housing fixed up

inside bearing cover (2 nos. Bearing to be provided as per drawing, keeping open side of two

bearings outward) .similarly insert one no. ball bearing inside D.E. bearing housing and provide

inside bearing cover.



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3. Now insert NDE bearing housing fitted with bearing through shaft after providing thrust collar

ring and tighten by bearing nut with lock washer and lock it. Other DE bearing housing as fitted

with bearing to with a approximation of its position, keeping it little bit away from its position on

the shaft.

4. Now after lifting the total assembly, you have to put it on the lower half of pump casing, keeping

bushes and wearing ring right in position, care should be taken about right position of lock pin

/lock collar of wearing ring and guide bushes. First tighten the NDE bearing housing after providing both side bearing housing align with dowel pin between housing and lower casing.

After full tightening of NDE bearing housing, provide the bearing end cover with 3 nos. bolt

provided for it. Next tighten the DE bearing housing and fixed up front bearing cover with bolt.

5. If pump is with mechanical seal, keep gland flange fitted with stationary face pressed by hand

with casing face and bring the rotary seal face with sleeve so that it touches with the stationary

face, remove gland flange and allow rotary seal assembly (fitted with sleeve for balance seal) to

move towards flange 3 to 4 mm (or as recommended by seal manufacturer) and tighten the screw

provided at rotary part of seal ( for balance seal screw of the sleeve fitted with rotary part). Now

your lower part assembly is ready to fixed up with your upper casing.

6. Check the clean surface of the both half casing before placement of upper half on lower half

casing. Replace casing gasket and care should be taken regarding edges of gasket especially for

mechanical seal where gland flange face touched with casing. Now check up the about dynamic

assembly by rotate with hand weather it touches with casing or not. If your centerline of impeller

does not coincides with casing centre line than you can axially move both of impeller together by

fighting and loosing both side impeller lock nut or double sleeve lock nut as applicable. After

aligning of rotor assembly lift the upper half of casing and fixed up on lower casing keeping line

with dowel pin and tighten 4 nos. pillar bolt and than all the casing bolt cross wise one by one. Put

coupling key at shaft, fit pump half coupling and tighten the coupling grub screw.

7. Provide two nos. packing than place lantern ring and again three nos. packing for gland pack

pump. Now provide split gland flange. For mechanical seal pump, before fixed up of seal cover

along with the stationary seal, place gasket /’O’ ring carefully. Tighten gland nut cross wise but

not too hard. Similarly fixed up other side stuffing box component.

8. Now the assembly is ready to fit with volute casing providing one recommended ring gasket.

Fit all grease pot, seal / gland flash pipe, pressure gauge and other fittings. This completes the re-

assembling.

Manual Vsc

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