O&M_Hydronic_Pumps_-_6.pdf

2905 PACIFIC DRIVE, NORCROSS, GA 30071

P. 770.447.4443 F.770.448.6120

SECTION 2 – PUMP & MOTOR DATA

CWP 1&2 – PUMP DATA

CWP 1&2 – MOTOR DATA

CWP 1&2 – PUMP MANUAL

CWP 1&2 – MOTOR MANUAL

CWP 1&2 - PUMP DATA

Pump Performance Datasheet Project name / location :

Consulting engineer :

Customer :

Customer ref. / PO :

Quote number :

Date last saved : 05/23/2014 9:28 AM

Tag Number : CWP-1,2 Service : Chiller Skid PACO Model : 6015-3/4 KP Quantity : 2 Quoted By (Sales Office) :

Quoted By (Sales Engineer) :

Operating Conditions Flow, rated : 126.0 l/s Differential head / pressure, rated (requested) : 333.0 kPa Differential head / pressure, rated (actual) : 332.9 kPa Suction pressure, rated / max : 190.0 / 190.0 psi.g NPSH available, rated : Ample Frequency : 50 Hz

Performance Speed, rated : 1,483 rpm Impeller diameter, rated : 13.03 in Impeller diameter, maximum : 15.00 in Impeller diameter, minimum : 9.00 in Efficiency : 85.89 % NPSH required / margin required : 10.66 / 0.00 ft MCSF : 43.66 l/s Head, maximum, rated diameter : 395.2 kPa Head rise to shutoff : 17.06 % Flow, best eff. point (BEP) : 125.3 l/s Flow ratio (rated / BEP) : 100.53 % Diameter ratio (rated / max) : 86.87 % Head ratio (rated dia / max dia) : 71.09 % Cq/Ch/Ce/Cn [ANSI/HI 9.6.7-2010] : 1.00 / 1.00 / 1.00 / 1.00 Selection status : Acceptable

Liquid Liquid type : Water Additional liquid description :

Solids diameter, max : 0.00 in Solids concentration, by volume : 0.00 % Temperature, max : 68.00 deg F Fluid density, rated / max : 1.000 / 1.000 SG Viscosity, rated : 1.00 cP Vapor pressure, rated : 0.34 psi.a

Material Material selected : Cast Iron

Pressure Data Maximum working pressure : 247.3 psi.g Maximum allowable working pressure : 250.0 psi.g Maximum allowable suction pressure : 202.0 psi.g Hydrostatic test pressure : 375.0 psi.g

Driver & Power Data Motor sizing specification : Non-overloading (max power) Margin over specification : 0.00 % Service factor : 1.15 Power, hydraulic : 56.27 hp Based on duty point (rated power) : 65.51 hp Non-overloading (max power) : 75.02 hp Nameplate motor rating : 100 hp / 74.57 kW

Grundfos Quotation System 14.1.1.2014050912

Grundfos CBS Inc. · 902 Koomey Road · Brookshire, Texas 77423 phone: 1-800-955-5847 · fax: 1-800-945-4777 · www.pacopumps.com

Project name / location : - Consulting engineer : - Customer : - Customer ref. / PO : - Quote number : - Date last saved : 05/23/2014 9:28 AM

Construction Nozzle Size (in.) Nozzle Configuration Pos'n Suction 8 250# ANSI Side Discharge 6 250# ANSI Side

Orientation / Configuration : Horizontal Rotation : Clockwise Wear Ring Configuration : Single - Case Discharge Elbow Size : - Subplate : - Sump Depth (feet) : - Bearing Frame : - Bearing Frame Foot : - Bearing Type (Radial/Thrust) : Ball/Ball Bearing Lubrication : Regreasable Thrust Bearing : - Intermediate Bearing : - Lower Bearing : - Bearing Housing Accessories : - PACO Construction code : 29-60153-A57001-12P7

Baseplate, Coupling and Guard Baseplate : Welded Steel Fabrication Drip Pan : No drip pan

Coupling : Woods Sureflex Type S(elastomeric) 12S Guard : OSHA Approved

Seal & Packing Construction Sealing Method : Single Seal, Type 1

Seal Material : Buna Carbon Ceramic SS-Springand Brass Hardware Packing Gland : - Lantern Ring : - Recirculation Lines : None

Weights (Approx.)

Pump : 973.0 lb Baseplate : 0.00 lb Driver : 750.0 lb Estimated Shipping gross weight : 1,723.0 lb

Tag Number : Default Service PACO Model : 6015-3/4 KP Quantity Quoted By (Sales Office) :

Quoted By (Sales Engineer) :

Motor Information Manufacturer Frame Size Power

RPM

Enclosure Operating Power Supply Efficiency Service factor Motor Application Motor Options/Accessories Cord Length (feet)

: 100 h

: 1,500 rpm : 50

Materials Case : Cast Iron, ASTM A48 - Class 35 Motor Bracket : -

Impeller : Silicon Bronze, ASTM B584 C87600 B21

Impeller Cap Screw and Washer : - Impeller Key : Steel, Cold Drawn C1018

Case wear ring : Tin Bronze, ASTM B584-90500 (B18)

Impeller wear ring : Not Applicable Pump Shaft : Stressproof Steel, AISI 1144 Sleeve : Bronze, III932, C89835 Line Shaft : - Column : - Discharge Pipe : - Discharge Elbow : - Suction Elbow : - Subplate : - Hardware : Steel, Grade 8 O Rings : Buna N Pump Coatings : Standard Manufacturers Paint

Grundfos Quotation System 14.1.1.2014050912 Construction Datasheet

Grundfos CBS Inc. · 902 Koomey Road · Brookshire, Texas 77423 phone: 1-800-955-5847 · fax: 1-800-945-4777 · www.pacopumps.com

: CWP-1,2

: Chiller Skid

: 2

CWP 1&2 – MOTOR DATA

No.:

Date: 11-SEP-2013

TECHNICAL PROPOSAL

Three-phase induction motor - Squirrel cage rotor

Customer :

Product line : Three-Phase : ODP (IP21/IP23) - NEMA Premium Efficiency

Catalog Number : 10018OT3E404TS List Price : $7,141

Notes:

Performed by: Checked:

No.:

Date: 11-SEP-2013

DATA SHEET

Three-phase induction motor - Squirrel cage rotor

Customer :

Product line : Three-Phase : ODP (IP21/IP23) - NEMA Premium Efficiency

Frame : 404TS Output : 100 HP Frequency : 50 Hz Poles : 4 Full load speed : 1475 Slip : 1.67 % Voltage : 400 V Rated current : 131 A Locked rotor current : 878 A Locked rotor current (Il/In) : 6.7 No-load current : 42.2 A Full load torque : 351 lb.ft Locked rotor torque : 210 % Breakdown torque : 270 % Design : A Insulation class : F Temperature rise : 80 K Locked rotor time : 10 s (hot) Service factor : 1.15 Duty cycle : S1 Ambient temperature : -20°C - +40°C Altitude : 1000 Degree of Protection : IP23 Approximate weight : 1052 lb Moment of inertia : 22.836 sq.ft.lb Noise level : ---

D.E. N.D.E. Load Power factor Efficiency (%) Bearings 6314 C3 6314 C3 100% 0.88 94.1 Regreasing interval 20000 h 20000 h 75% 0.87 94.0 Grease amount 27 g 27 g 50% 0.80 93.9

Performed by Checked

Percent of rated output (%)

A

- E ffi ci en cy

B

- P ow er fa ct or

C

- Slip

D

- C urrent at 400V (A)

0 10 20 30 40 50 60 70 80 90 100 110 120 130

0.4

0.5

0.6

0.7

0.8

0.9

1.0 0.0

1.0

2.0

3.0

4.0

5.0

A

B

C

D

No.:

Date: 11-SEP-2013

PERFORMANCE CURVES RELATED TO RATED OUTPUT

Three-phase induction motor - Squirrel cage rotor

Customer :

Product line : Three-Phase : ODP (IP21/IP23) - NEMA Premium Efficiency

Frame : 404TS Output : 100 HP Frequency : 50 Hz Full load speed : 1475 Voltage : 400 V Rated current : 131 A Insulation class : F

Locked rotor current (Il/In) : 6.7 Duty cycle : S1 Service factor : 1.15 Design : A Locked rotor torque : 210 % Breakdown torque : 270 %

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

A

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

B

0 10 20 30 40 50 60 70 80 90 100 Speed related to rated speed (%)

A

- T or qu e re la te d to ra te d to rq ue

(C /C n)

B - C urrent related to rated current (I/In)

No.:

Date: 11-SEP-2013

CHARACTERISTIC CURVES RELATED TO SPEED

Three-phase induction motor - Squirrel cage rotor

Customer :

Product line : Three-Phase : ODP (IP21/IP23) - NEMA Premium Efficiency

Frame : 404TS Output : 100 HP Frequency : 50 Hz Full load speed : 1475 Voltage : 400 V Rated current : 131 A Insulation class : F

Locked rotor current (Il/In) : 6.7 Duty cycle : S1 Service factor : 1.15 Design : A Locked rotor torque : 210 % Breakdown torque : 270 %

1 2 3 4 5 6 7 8

A

B

C

D

E

F

11-SEP-2013Three-phase induction motor Frame 404TS - IP23

Notes:

Performed by:

Checked:

Customer:

Three-Phase : ODP (IP21/IP23) - NEMA Premium Efficiency

2E 16.000

A 19.950

2F 12.250/13.750

B 17.700

BA

6.625

J 3.950

K 5.440

P 17.874

ES

2.756 depth 0.500

S 0.500

D 10.000

N-W 4.250

G 1.968

U 2.125

O 19.409

T 2.8

R 1.842

H 0.807

AB

16.378

C 31.141

AA

NPT 3"

d1

DUNC 3/4"-10

CWP 1&2 – PUMP MANUAL

B1d.1 4/06 Supercedes 8/05

PACOPACOPACOPACOPACO

PUMPS

INSTALLATION, OPERATION AND

MAINTENANCE INSTRUCTIONS

PACOPACOPACOPACOPACO

SPLIT CASE

PUMPS

TYPE KP & TYPE KPV

KP KPV

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PUMPS

TABLE OF CONTENTS

I. INSTALLATION - MECHANICAL

A. Pump Identification B. Receiving C. Temporary Storage D. Location E. Pump Foundation F. Securing The Base Plate G. Piping-General H. Suction Inlet Piping I. Discharge Outlet Piping J. Shaft Sealing-General Comments K. Gland Adjustment .................................................................................................................... 5-6 L. Mechanical Seals M. Coupling Alignment

II. INSTALLATION - ELECTRICAL

A. Motor-General

III. OPERATION

A. Priming B. Pre-Start Checklist C. Motor Rotation D. Starting The Pump E. Pump Shutdown F. Short Duration Shutdown G. Extended Period Shutdown

IV. MAINTENANCE

A. Motor Lubrication ..................................................................................................................... 8-9 B. Pump Bearing Lubrication-General Comments C. Stuffing Box Packing Shaft Seal-Water Lubrication D. Packing Maintenance E. Disassembly for Maintenance-General Comments F. Bearing, Seal, & Packing Replacement

1.Bearing Replacement 2.Mechanical Seal Replacement 3.Packing Replacement, Each Side .....................................................................................11-12

G. Disassembly of Horizontal Pumps H. Disassembly of Vertical Pumps I. Component Inspection J. Reassembly of Pumps...................................................................................................... 12 & 15

V. ORDERING PARTS

VI. TROUBLESHOOTING

A. Symptoms B. Possible Causes ................................................................................................................. 16-17

VII. WARRANTY

VIII.SALES AND SERVICE CENTERS

CAUTIONS and WARNINGS are inserted at key points of this manual to provide check points for personnel and machinery safety. CAUTIONS: Apply to personnel. WARNINGS: Apply to personnel and machinery.

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I. INSTALLATION - MECHANICAL

All installations should be performed by personnel expe-rienced with the placement, connection, and alignment of pumping equipment. The following instructions are gen-eral in nature, and may not deal with the specifics of your installation. Read these instructions thoroughly before installing and operating your PACO Type KP Double Suction Centrifugal Split Case Pump. Suc-cessful operation depends on careful attention to the pro-cedures described in Sections I, II, III and IV of this manual. Keep this instruction manual handy for future use.

A. PUMP IDENTIFICATION

• All PACO Pumps are identified by Catalog and Serial Numbers. These are stamped on the pump nameplate (Figure 1) affixed to each pump casing and should be referred to in all correspondence with the Company.

PACOPACOPACOPACOPACO

FIGURE 1a

B. RECEIVING

• Check pumping unit for shortages and damages immediately upon arrival. Pump accessories, when required, are packaged in a separate container and shipped with the unit.

• If equipment is damaged in transit, immediately report the damage to the truck line’s agent.

Make a complete report on the freight bill to speed satisfactory adjustment by the carrier.

• Unload and handle the equipment with a sling or tow motor. Do not lift unit by lifting lugs on the pump case or eye.

• Eyebolts on the motor! These are not intended to support the complete pump assembly but to aid in

C. TEMPORARY STORAGE

• If the pump is not to be installed and operated within a few days after arrival, store in a clean, dry area of moderate ambient temperature.

• Rotate the shaft by hand monthly to coat the bear-ings with lubricant and retard oxidation and corro-sion.

• Where applicable, follow motor manufacturer’s storage recommendations.

D. LOCATION

• Locate the pump as close to the suction supply as possible. Use the shortest and most direct suc-tion piping practical. Refer to paragraph H. SUC-

TION (INLET) PIPING.

• Locate the pump below system level wherever possible. This will facilitate priming, assure a steady liquid flow, and provide a positive suction head.

• Make sure sufficient NPSH (Net Positive Suction Head) is provided at the suction end by considering the pump’s location in relation to the entire sys-tem. Available NPSH must always equal or exceed required NPSH specified on the pump performance curve.

• Always allow sufficient accessibility for mainten-ance and inspection. Provide a clear space with ample head room for use of a hoist strong enough to lift the unit.

• Make sure a suitable power source is available for the pump motor. Electrical characteristics should match those specified on the motor data plate, within the limits covered in Sections II & III.

• Avoid pump exposure to sub-zero temperatures to prevent pump liquid from freezing. If freezing conditions exist during shutdown periods, seeSec-tions IIIE and IIIF for specific recommendations.

E. PUMP FOUNDATION

• Your Type KP pump should be permanently installed on a firm, concrete foundation mounting pad of suffi-cient size to dampen any vibration and prevent any deflection or misalignment. The pad may float on springs or be a raised part of the equipment room floor. The foundation should be poured without in-terruption to 3/4 to 1-1/2 inches below the final pump elevation. The top surface should be well scored or

CAT #: 29-20951-120061-1741

STOCK #:

SER #: ##### 97X12345

GPM:280 IMP.

DIA. “

BROOKSHIRE, TEXAS 34014412

Pumps

“”“”“”“”“”“”’TDH:264 8.4"

disassembly.

4/06 Supercedes 8/05

PACOPACOPACOPACOPACO

PUMPS

grooved before the concrete sets to provide a suit-able bonding surface for grout. Anchor bolts should be set in pipe sleeves for positioning allowance, as shown in Fig. 2a. Allow enough bolt length for grout, lower base plate flange, nuts and washers. Allow the foundation to cure several days before proceed-ing with pump installation.

F. SECURING THE BASE PLATE

• After the concrete pad has been poured and set, lower the pump base plate over the anchor bolts and rest it on loose adjustment wedges or shims placed

G. PIPING-GENERAL

• Do not use pump as a support for piping! Use pipe hangers or other supports at proper intervals to provide complete piping support near the pump.

• Both suction and discharge piping should be inde-pendently supported and properly aligned to insure no strain is transmitted to the pump when the bolts are tightened. Use of expansion joints or vibration pads does not preclude the need to properly support the piping.

• Do not spring or force piping when making connections!

• Make sure all piping is as direct as possible.

• Avoid unnecessary bends and fittings.

H. SUCTION (INLET) PIPING

The sizing and installation of suction piping is particu-larly important. It must be selected and installed in a manner that minimizes pressure loss and permits suffi-cient liquid flow into the pump during starting and opera-tion. Many NPSH problems can be traced directly to improper design of suction piping systems. Observe the following precautions when installing piping:

• Suction piping should be as direct as possible, and ideally the length should be at least ten times the pipe diameter. Short suction piping can be the same diameter as the suction opening. Longer piping should be one or two sizes larger (depending on length), reducing to the diameter of the suction open-ing near the pump.

• Use an eccentric reducer, with the eccentric side down, as shown in (Fig. 3a on page 5) when reducing pipe diameter to the diameter of the pump suction opening.

• At no time should suction piping be smaller in diameter than the pump suction opening.

• Horizontal suction lines should follow an even gradient, if possible. A gradual upward slope to the pump is recommended for suction lift conditions, and a gradual downward slope for positive suction head.

• Avoid any high points, such as pipe loops, as shown in (Fig. 4a on page 5), that may create air pockets and throttle the system or produce erratic pumping.

24" along each side.

• Shims or wedges must be placed to raise the bottom of the base 3/4" to 1-1/4" above the pad, allowing clearance for grout. Level the pump shaft, flanges, and base plate using a spirit level, adjusting the wedges or shims, as required.

• Check to make sure the piping can be aligned to the pump flanges without placing any strain on either flange.

• After pump alignment has been established, put nuts on foundation bolts and tighten them just enough to keep the unit base plate from moving. Construct a form or dam around the concrete pad and pour grout in and around the pump base. (See Fig. 2a). Grout compensates for uneven foundation, distributes the weight of the unit, and prevents shifting. Use an ap-proved, non-shrinking grout (such as Embeco 636 by Master Builders, Cleveland, Ohio or equivalent).

Allow at least 24 hours for this grout to set before proceeding with piping connections.

• After the grout has thoroughly hardened, check the foundation bolts and tighten if necessary. Recheck the pump alignment after the foundation bolts are se-cured.

BASE PLATE

.75 TO 1.25

ALLOWANCE FOR

GROUT

DAM

PIPE SLEEVE

WASHER

WEDGES OR SHIMS

LEFT IN PLACE

LUG

FINISHED

GROUTING

.25

TOP OF FOUNDATION LEAVE

ROUGH CLEAN & WET DOWN

GROUT

FIGURE 2a: Anchor Bolt Installation.

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PACOPACOPACOPACOPACO

PUMPS

• Install a valve in the suction line to isolate the pump during shutdown and maintenance.

• Valves should always be installed in positions that avoid air pockets. Globe valves should not be used, particularly when NPSH is critical.

• During pumping operation, valves on the suction line must always be at FULL OPEN.

• Pressure gauges properly sized for the range of operation, should be installed in gauge taps on the pump suction and discharge nozzles.

I. DISCHARGE (OUTLET) PIPING

• Short discharge piping can be the same diameter as the pump discharge opening. Longer piping should be one or two sizes larger depending on length.

• Any high points in discharge piping may entrap air or gas and thus retard pump operation. Air vents or bleed valves as a means to release entrapped air are recommended.

• An even gradient is best for long horizontal runs of discharge piping.

• Install a valve near the pump discharge opening to prime and start the pump. The discharge valve is also used to isolate the pump during shutdown and maintenance.

J. SHAFT SEALING-GENERAL COMMENTS

• PACO offers both mechanical seals and packed stuffing boxes as a means to seal the shaft. Pumps with stuffing boxes are normally packed before ship-ment. If the pump is installed within 60 days after shipment, the packing material will be in good condi-tion for operation with a sufficient supply of lubrica-tion. If the pump is stored for a longer period, it may be necessary to repack the stuffing boxes (see Pack-ing Replacement, Page 11, to repack the boxes).

• The stuffing box must be supplied at all times with a source of clean, clear liquid to flush and lubricate the packing (see Packing Replacement, Page 11). When pumps are equipped with mechanical seals, no main-tenance or adjustment is required.

K. GLAND ADJUSTMENT

• Make sure the flushing fluid lines are connected and their valves are open. After pump start-up, with the pump running,the packing gland should be ad-justed to permit 40 or 60 drops per minute leakage, this is required for shaft sleeve lubrication.

FIGURE 3a:

Suction Piping (Eccentric vs. Concentric).

FIGURE 4a: Suction Piping (Avoid high points).

4/06 Supercedes 8/05

PACOPACOPACOPACOPACO

PUMPS

• The packing gland should be tightened evenly to pro-vide uniform compression on the packing material.

Do not operate packing dry, and do not over tighten packing gland to eliminate leaking as the shaft sleeve will become damaged. After initial start up, additional packing and adjustment may be required until the packing is properly seated.

L. MECHANICAL SEALS

• All PACO Type KP Double Suction Centrifugal Split Case Pumps that are equipped with mechanical seals are matched to the conditions for which the pump was sold. Observe the following precautions to avoid seal damage and obtain maximum seal life.

• Do not exceed temperature or pressure limitations for the mechanical seal used.

• Do not run the pump dry or against a closed valve! Dry operation will cause seal failure within minutes.

• Purge all air from the seal chambers and recircula-tion lines prior to operating the pump.

• Clean and purge suction piping in new installations before installing and operating pump. Pipe scale, welding slag and other abrasives can cause rapid seal failure.

• The mechanical seal does not leak at all during normal operation, therefore if any appreciable leak-age occurs, the seal should be removed, inspected and if necessary replaced. Mechanical seals should be stocked as spare parts to reduce equipment down time.

M. COUPLING ALIGNMENT

• The following anchoring and alignment procedure is typical and, if performed with care, should result in a smooth running, trouble-free installation.

• If the pump and motor were shipped mounted on the pump base as an assembly, remove the coupling guard.

• The pump and motor were accurately aligned at the factory, but handling during shipment usually alters this pre-alignment. Using a small straight edge and feeler gauges or a dial indicator, check for horizon-tal, vertical, and angular misalignment of the cou-pling hubs (Fig. 5a).

• Coupling alignment is proper when the dial indicator reads no more than .005" runout in any direction (or when the straight edge contacts both hubs evenly

FIGURE 5a: Checking Angular Alignment.

Checking Angular Alignment

Checking Parallel Alignment in both horizontal and vertical positions). If misalign-ment is detected, loosen the motor and shift or shim as necessary to re-align, then re-tighten bolts. Al-ways align the motor to the pump as piping strain will occur if the pump is shifted.

Never reposition pump on base!

• After final piping connections to the pump have been made, motor wiring compared, correct rotation has been established, and piping filled with liquid, check shaft alignment once again.

• Leave the coupling guards off until the pump prim-ing procedure is completed for a final shaft align-ment check.

• To protect personnel from rotating machinery, Always install coupling guards after installation

4/06 Supercedes 8/05

PACOPACOPACOPACOPACO

PUMPS

WARNING: In the interest of operator safety, the unit must not be operated above the nameplate condi-tions. Such operation could result in unit failure causing injury to operating personnel. Consult in-struction book for proper operation and maintenance of the pump and its supporting components.

Make the following inspections before starting your PACO Type KP Double Suction Centrifugal Split Case Pump:

����� Make sure the suction and discharge piping has been cleaned and flushed to remove dirt and debris before operating pump.

����� Make sure all wiring connections to the motor (and starting device) match the wiring diagram and pro-duce proper rotation.

����� If the motor has been in storage for an extended length of time, either before or after installation, refer to motor instructions before starting.

����� Check the voltage, phase, and line circuit frequency with the motor nameplate.

����� Turn rotating element by hand to make sure it ro-tates freely.

����� Tighten plugs in gauge and drain taps. If the pump is fitted with pressure gauges, keep gauge clocks closed when not in use.

����� Recheck the motor to pump alignment per Coupling Alignment, M, section �.

����� Check suction and discharge piping for leaks, and make sure all flange bolts are securely tightened.

C. MOTOR ROTATION

CAUTION: Never check driver rotation unless pump and driver couplings are disconnected and physically separated. Failure to follow this instruction can re-sult in serious damage to pump and driver if rotation is wrong.

After the unit has been wired and checked to ensure that all components in the system (disconnect device, mag-netic starters, pilot devices and motors) are properly con-nected, check motor rotation as follows:

• Make sure coupling is disconnected, then momen-tarily energize the motors to insure that rotation is correct as indicated by the arrow cast into the pump casing. If rotation is incorrect, interchange is complete; before starting pump!

II. INSTALLATION - ELECTRICAL

A. MOTORS - GENERAL

• All electrical installations should be accomplished by qualified electrician. Disconnect and lock out the electrical power source, before starting any installation or service work.

• Read and match the starting and overload control devices with motor nameplate information. Always follow control manufacturer’s instructions for proper installation and connection.

• Grease lubricated motors are fully lubricated at the time of manufacture and do not require further lubri-cation if prompt installation follows. If the motor has been in storage for six months or longer, refer to Motor Lubrication (page 8), and lubricate before start-ing.

III. OPERATION

A. PRIMING

• The PACO Type KP Double Suction Centrifugal Split Case Pump is not self-priming, and must be com-pletely primed (filled with liquid) before starting.

• If the pump will operate with a positive suction head, prime by opening the suction valve and allow-ing liquid to enter the pump casing. Open the air vent at the top of the upper pump casing and the top of each suction dome, and make sure all air is forced from the pump by liquid before closing.

• IMPORTANT: Rotate the shaft by hand while prim-ing and venting to free entrapped air from the impeller passageways.

• If the pump has suction lift, priming must be accom-plished by other methods. The use of foot valves, ejectors or vacuum pumps, or by manual filling of the pump casing and suction line with liquid are possible methods suggested for this purpose.

• CAUTION: Never run the pump dry in the hope that it will prime itself! Serious damage to the shaft seals, pump wear rings and shaft sleeves will result.

B. PRE-START CHECKLIST

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• For overnight or temporary shutdown periods under non-freezing conditions, the pump may remain filled with liquid. Make sure the pump is fully primed be-fore restarting.

• For short or frequent shutdown periods under freez-ing conditions, keep fluid moving within the pump casing and insulate or heat the pump exterior to pre vent freezing.

G. EXTENDED PERIOD SHUTDOWN

• For long shutdowns or to isolate the pump for main-tenance, close the suction and discharge valves. If no suction valve is used and the pump has positive suction head, drain all liquid from the suction line to terminate liquid flow into the pump suction nozzle. If applicable, turn off any external source of cooling or lubricating fluid to the shaft seals. Remove plugs in pump drain and vent taps, as required, and drain all liquid from the pump casing. Remove packing, if ap-plicable.

• If freezing conditions will exist during long shut down periods, after draining the pump, blow out all liquid in passages and pockets with compressed air.

Freezing of pump liquid can also be prevented by filling the pump with antifreeze solution.

• Rotate the shaft by hand monthly to coat bearings with lubricant and retard oxidation and corrosion.

• Where applicable follow motor manufacturer’s storage recommendations.

IV. MAINTENANCE

A. MOTOR LUBRICATION

WARNING: Do not attempt any maintenance, inspection, repair or cleaning in the vicinity of rotating equipment. Such action could result in personal injury to operating personnel.

Before attempting any inspection or repair on the pump, the driver controls must be in the "OFF" position, locked and tagged to prevent injury to personnel performing service on the pump.

• Always follow motor manufacturer’s lubrication instructions if available, and periodically check grease fittings and drain plugs for leaks.

• If lubricating instructions do not accompany motor, refer to (Table 6a) for recommended lubrication peri-ods.

two wires at the motor starter terminals T1 and T2.

• For Wye-Delta motors rotation has to be verified for both wye and delta connections.

D. STARTING THE PUMP

WARNING: The pump must not be operated without an approved coupling guard in place. Failure to ob-serve this warning could result in injury to operating personnel.

• Install coupling guard on flexible coupled units.

• Fully open valve (if any) in suction line, and close valve in discharge line.

• If applicable, turn on any external source of cooling or lubricating fluid to the shaft seals.

• Start the motor (pump).

• Immediately after the pump reaches full operating speed, slowly crack open the discharge valve, and open bleed valves at system high points. Do not open discharge valve completely until system is full of liquid, purged of air and checked for leaks.

• After entirely filling the system, fully open discharge valve and close system bleed valves.

• If the pump is fitted with pressure gauges, open gauge cocks and record pressure reading for future reference. Verify that the pump is performing in ac-cordance with the parameters specified on the per-formance curve.

• Check and record voltage, amperage per phase, and kilowatts, if a watt meter is available.

E. PUMP SHUTDOWN

• The following shutdown procedures will apply in most normal shutdowns for the PACO Type KP Double Suction Centrifugal Split Case Pump. If the pump will be inoperative for an extended length of time, follow storage procedures in Extended Period Shut-down.

• Always close the discharge valve before stopping the pump. Close the valve slowly to prevent hydraulic shock.

• Cut and lock off power to the motor.

F. SHORT DURATION SHUTDOWN

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PACOPACOPACOPACOPACO

PUMPS

• Table 7a lists the recommended types of grease for motor lubrication. These types have all been thor-oughly tested and should be used whenever possible.

B. PUMP BEARING LUBRICATION-

GENERAL COMMENTS

WARNING: Operation of the unit without proper lu-brication can result in overheating of the bearings, bearing failures, pump seizures and actual breakup of the equipment, exposing operating personnel to personal injury.

• PACO Type KP Double Suction Centrifugal Split Case Pumps have bearings that may be “sealed-for-life” (requiring no lubrication), regreaseable or oil-lubed.

• Regreaseable bearings are packed with grease at our factory prior to shipping. This initial filling of grease is good for one year or 2000 hours of normal opera-tion, whichever occurs first. After this time, a regular grease maintenance schedule must be implemented.

(See Table 8a for recommended pump bearing greases).

TABLE 7a: Recommended Bearing Grease For Motors

MANUFACTURER BEARING LUBRICANT

CHEVRON

TEXACO

SRI Grease NLGI No.2

Polystar RB2 NLGI No.2

• To lubricate motor while running or at rest, remove grease drain plug (if any) and filler plug on grease fitting. Grease with clean lubricant until grease ap-pears at drain hole or along motor shaft.

TABLE 8a: Recommended Bearing Grease For Pumps.

• Do not over-grease! Too much grease can cause over-heating and premature bearing failure. The bearing manufacturers recommend that the bottom 1/3 of the bearing be filled with grease. That is all!

• On those PACO Type KP Centrifugal Split Case Pumps ordered with oil lubricated bearings, (See Fig.

9a) a regular oil maintenance program must be enforced. Pumps with oil lubricated bearings are fitted with a transparent reservoir (85) (constant level oiler) that maintains the oil level about the centerline of the lower bearing. When necessary, the oil supply in the reservoir of the constant level oiler must be renewed. To refill, remove the reservoir and fill with oil. After filling with oil replace into operating posi-tion.

• After the first 200 hours of operation the oil should be changed. To change the oil, remove the drain plug (16K) at the bottom of the bearing cover and the filler plug (16B) (which also acts as a vent plug) at the top of the housing. After draining oil, replace the fittings and refill with an acceptable oil selected from Figure 10a. After the first oil change, the oil should be changed again at 2000 hours and then at intervals of 8000 hours or once yearly thereafter.

FIGURE 9a: Oil Lubricated Bearing Construction

26J 19B 14M

16B

19A16K

WARNING: Pumps shipped prior to August 1, 1996, refer to factory for bearing lubrication recommen-dation.

MOTOR

RPM

MOTOR

HP

OPERATING CONDITIONS

STANDARD SEVERE EXTREME

10-40 50-150

200 & UP

(ALL HP)

1750 &

BELOW

1-3 YRS.

1 YR.

1 YR.

6 MOS.

6 MOS.-1 YR.

3 MOS.

3 MOS.

3 MOS.

6 MOS.-1 YR.

6 MOS.

6 MOS.

3 MOS.

STANDARD CONDITIONS:

8 Hours per day operation, normal or light loading, clean air, 100ºF, maximum ambient temperature.

SEVERE CONDITIONS:

Continuous 24-hour operation, shock loading or vibration, poor ventilation, 100º-150ºF, ambient temperature.

EXTREME CONDITIONS:

Continuous operation, heavy shock or vibration, dirt or dust in air, extreme ambient temperature.

ABOVE

TABLE 6a: Recommended Lubrication Periods.

MANUFACTURER

SHELL

EXXON

CHEVRON

PHILIPS

TEXACO

LUBRICANT

DOLIUM® R

POLYREX®

SRI GREASE NLGI 2

BLACK PEARL - NLGI 2

POLYTAC™

POLYSTAR RB

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C. STUFFING BOX PACKING SHAFT SEAL-

WATER LUBRICATION

• The stuffing box must be supplied at all times with a source of clean, clear liquid to flush and lubricate the packing. Only a sufficient volume of sealing liquid to create a definite direction of flow from the stuffing box inward to the pump casing is required. Piping from the pump discharge dome to the packing box is supplied on PACO Type KP Double Suction Centrifu-gal Split Case Pumps when requested.

D. PACKING MAINTENANCE

• The stuffing box should be packed with fresh packing before initial start-up, after repairs to the pump,and in case of excessive leakage. Any time the packing is replaced, the shaft sleeves should be inspected for wear, roughness or scouring and replaced with new ones, if necessary. For instructions on filling the stuffing box see Packing Replacement;

for seal gland adjustment see Gland Adjustment.

E. DISASSEMBLY FOR MAINTENANCE-

GENERAL COMMENTS

WARNING: Depending on the product being pumped, the pump should be washed down before any work is done on it.

WARNING: Observe extreme caution when venting and/or draining hazardous liquids. Wear protective clothing in the presence of caustic, corrosive, vola-tile, flammable, or hot liquids. DO NOT breathe toxic vapors. DO NOT allow sparking, flames, or hot sur-faces in vicinity of the equipment.

• PACO Type KP Double Suction Centrifugal Split Case Pumps are designed for ease of maintenance and, as such, the seals, sleeves, wear rings, clearances and bearings can be inspected without having to remove the complete rotating element or having to disconnect the suction or discharge pip-ing, or disturbing the alignment of the pump set.

• Work on this equipment is to be performed only by qualified personnel. Read the following instructions completely before performing any maintenance on the pump.

• Before beginning disassembly of the pump, close the suction and discharge isolation valves, turn off any external source of cooling or lubricating fluid to the shaft seals, drain the pump case by opening the drain and vent plugs, and disconnect and lock off the mo-tor power source.

F. BEARING, SEAL, & PACKING REPLACEMENT

All normally required parts for PACO Type KP Pumps are available in kit form. Refer to B1b.2 (attached) for correct kit selection.

1. BEARING REPLACEMENT:

(Refer to drawings on pages 13 and 14).

• Remove motor.

• Remove coupling half (23B) from pump shaft (6A) using a wheel puller and remove coupling key (12B).

• Remove bearing caps (19A) and (19B).

• Loosen set screws in eccentric locking rings of bear-ings (18A and 18B) and turn rings in opposite direc-tion of pump rotation to loosen on shaft, or remove retaining snap ring, whichever is applicable.

TABLE 10a: List of Acceptable Lube Oils.

LUBRICANT

MANUFACTURER

Aral Refining Co.

British Petroleum Co.

Calypsol Oil Co.

Standard Oil Co.

Esso Corporation

Fina Oil Company

Gulf Refining Co.

Socony Mobil Oil Co.

Shell Oil Company Sundco Oil Company

The Texas Company

Wisura Rining Co.

BEARING OIL

BRAND NAME

ARAL OIL CMU

ARAL OIL TU 518

BP ENERGOL

TH 100-HB

CALYPSOL BISON OIL

SR25 OR SR36

CHEVRON

HYDRAULIC OIL 11

CIRCULATING OIL 45

ESSO-MAR 52

TERESSO 47

ESSTIC 50

FINA HYDRAN 34

FINA CIRKAN 32

GULF HARMONY 47

GULF PARAMOUNT 45

VAC HLP 25

MOBILUX D.T.E. 25

SHELL Tellus OIL 29

SUNVIS 821

TEXACO Ursa Oil P 20 DEA VISCOBIL Sera 4

WISURA Norma 25 (36) WISURA Tempo 25 (36)

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• Remove cap screws from each bearing housing (26J, 26K) and slide, with bearing, off its end of shaft. Note that the seal seats in the bearing housings of seal type pumps can be broken if care is not exercised dur-ing housing removal.

• Remove bearings (18A, 18B) from bearing housings.

• Install New Seals and Seal Seats.

• Reinstall bearing housings less bearings, noting that water slinger (13G) is in correct place. Care must be taken not to break the seal seats of seal type pumps by striking them against shaft.

• Clean out housings and slide new bearings over shaft and into housings. Press only on inner race of bear-ing. Use bearing warmer, if available.

• Turn eccentric locking rings in direction of pump rotation to tighten on shaft and tighten set screws,or replace spacer and retaining snap ring, which-ever is applicable.

• Pack ball bearings and bearing cap cavities with clean ball-bearing grease. (See Table 8a)

• Replace bearing caps (19A, 19B).

• Replace packing glands (7A) after following packing instructions Packing Replacement, each side, if pack-ing type pump.

• Gently tap coupling half (23B) on shaft (6A) over key (12B). Do not tap if it can be pushed on. Undue force in driving on coupling half can damage ball-bear-ings and/or fracture the seal faces. If there is diffi-culty putting coupling onto shaft, heat up coupling half to a temperature of not more than 300° and then slide onto shaft using protective gloves.

• Replace motor and realign.

NOTE: On vertically mounted pumps, it will be neces-sary to remove the rotating assembly in order to change lower bearing and seal assembly. Follow directions in Section H, Disassembly of Pump.

2. MECHANICAL SEAL REPLACEMENT

• Follow above steps to remove bearing housings (26J, 26K). NOTE: It is not necessary to remove bearings from housings, however, it is recommended that bear-ings be replaced.

• Remove old seal head and seal seat (14A) from shaft sleeve and bearing housing or seal cap respectively.

• Inspect shaft sleeves (5A, 5D) for scoring or pitting.

Replace if surface is rough to your fingernail.

Proper seal seat installation:

• Clean seal cap or bearing housing.

• Lightly lubricate new seat’s rubber cap with liquid soap.

• Press in seal seat with proper tool or fingers, mak-ing sure seat is seated squarely and all the way into seal cap or bearing housing. Do not touch seal seat or head faces.

Proper seal head installation:

• Clean and lightly lubricate shaft sleeves (5A, 5D) or shaft (6A). Make sure there are no sharp edges or corners to cut the seal’s rubber parts.

• Lightly lubricate seal face elastomers with liq-uid soap.

• Slide assembly onto sleeve or shaft until spring touches shoulder, using proper tool or fingers.

Do not compress spring. Make sure notches on carbon ring match retainer’s lugs and spring is in position on seal head.

• Reinstall bearing housings (26J) with bearings, noting that water slingers (13G) are in correct places. Care must be taken not to strike seal seats against shaft.

• Follow remaining Bearing Replacement steps to complete assembly.

3. PACKING REPLACEMENT, EACH SIDE

• Remove packing gland (7A).

• Remove old packing (13A ), lantern ring (5L), if any, and packing behind lantern ring, with a packing hook.

• If packing retainer (10K) comes out, replace it against retaining ring (61J).

• Insert two new packing rings (13A) one at a time, staggering the joints 180° and pushing them firmly back against the packing retaining washer.

• Insert lantern ring (5L), if any.

• Insert three more rings of packing (applies to most sizes) staggering joints 180°. If no lantern ring is used, one extra ring of packing will be required.

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• Replace packing gland (7A).

• Packing requires lubrication. Therefore, it should always be allowed to leak a 40 to 60 drops per minute. Never over tighten packing gland.

• Should it become necessary to over tighten the packing (suction lift applications) while starting the pump, make sure to loosen packing immediately after pump is started, allowing a leakage of a 40 to 60 drops per minute. Readjust after a few hours of running, if leakage increases.

G. DISASSEMBLY OF HORIZONTAL PUMPS

• Remove bolts and nuts holding casing halves (1A & 1L) together, and remove capscrews holding bear-ing housing (26J, 26K) to pump casing.

• Remove case roll pin (98M) then lift off upper case (1A).

• Place casing gasket, as well as all other gaskets, in water to keep them from drying out and shrinking.

• Remove shaft assembly from case.

• To disassemble rotating assembly, refer to Bearing Re-placement.

• Unscrew and remove shaft sleeves (5A, 5D) or impeller lock nuts by turning them in direction of pump rotation. One has R.H. threads. The other has L.H. threads. Do not place wrench on the part of sleeve that comes in contact with seal or packing. Use strap wrench.

• Pry wear ring retaining rings (61P) off of wear ring (4A).

• Slide wear ring (4A) off impeller.

• Mark impeller (3D) with a mark on coupling side before removing it from shaft to be sure it will be reassembled identically.

• Press impeller (3D) from shaft (6A) and key (12A).

H. DISASSEMBLY OF VERTICAL PUMPS

• Remove coupling guard and remove coupling grid (23C).

• Remove all capscrews on bearing housings (26J, 26K) except for two on lower case (1L) to hold rotating assembly in place while removing upper case (1A).

• Remove case roll pin (98M) then lift off upper case (1A).

• Place casing gasket, as well as all other gaskets, in water to keep them from drying out and shrinking.

• Remove shaft assembly from case.

• To disassemble rotating assembly, refer to Bearing Re-placement.

I. COMPONENT INSPECTION

• While the pump is disassembled, all components should be inspected for wear, damage, deteriora-tion or erosion.

• Shaft sleeves should be inspected and if worn or deeply scored should be replaced.

• Impeller wear ring (if used) and casing wear ring (4B) should be checked for erosion or wear and if badly deteriorated, replaced to renew original pump perfor-mance. The design clearance is .018" to .022" diametrically. Clearances greater than .040" effect pump performance and new rings should be installed.

• Examine the lapped faces of the mechanical seals for scoring, heat checking or cracking. Examine mechanical seal elastomers (rubber components) for deterioration or hardening. Replace mechanical seals if any damage exists.

• Check any external source of cooling or lubricating fluid lines, and/or recirculation lines and ports for clogs, kinks or other restrictions.

• Clean machined mating surfaces of all components to remove grit, grime and/or old sealing material before reassembling pump.

J. REASSEMBLY OF PUMPS

• Reinstall impeller (3D) and key (12A) on shaft (6A), centering impeller on shaft with respect to sleeve or lock nut threads. Be sure impeller is installed on shaft the same way it came off, with vane curvature and per mark made during disassembly. Note that pump will deliver little or no water if impeller is in-stalled backwards.

• Be sure a good O-ring gasket (17S) is in place on each sleeve, if shaft has sleeves. Replace as necessary.

• Replace shaft sleeves (5A, 5D) or nuts, turning them in opposite direction of pump rotation. Do Not place wrench on the part of sleeve that comes in contact with seal or packing. Tighten evenly so impeller position will not shift.

• Replace wear ring retaining ring (61P) over wear ring (4A).

• Slide wear ring (4A) over each impeller hub.

(continued on page 15)

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Horizontally Mounted Type KP

18A 14A 11X5A

4A

3D

35F 22A

7A 12A

98M 1L

1A

17E

10K

6A

12B26K 13G

19A

1A 5D

61P 61J 5L

13A 26J15A17S

18B 19B

23B

ITEM

NO.

1A 1L 3D 4A 4B 5A 5D 5L 6A 7A

10K

PART

NAME

Upper Case Lower Case

Impeller Wear Ring

Casing Wear Ring Shaft Sleeve Shaft Sleeve Lantern Ring Pump shaft

Packing Gland Packing Retainer

ITEM

NO.

11X 12A 12B 13A 13G 14A 16D 15A 17E 17S 18A

PART

NAME

Gasket

Key Coupling Key Packing Ring Water Slinger

Seal Seat Plug

Petcock O-Ring Gasket O-Ring Gasket

Bearings

ITEM

NO.

18B 19A 19B 23B 26J 26K 61J 61P 98M

PART

NAME

Bearings Bearing Cap Bearing Cap Coupling Half

Bearing Housing Bearing Housing Retaining Ring Retaining Ring

Roll Pin

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Vertically Mounted Type KPV

11X

12B

8J

19B 21F

1A

5D 17S

19A 20J

23B

26K

4A 12A

17E 13G

16D

18B

16F

16L

26K

11X

5A

98M

12B

1A

3D 1L

14M 18A

19A 20J

23C 23A

61P

17E 13G

16D

6A

16F

16L

26K

14A

ITEM

NO.

1A 1L 3D 4A 4B 5A 5D 5L 6A 7A

10K

PART

NAME

Upper Case Lower Case

Impeller Wear Ring

Casing Wear Ring Shaft Sleeve Shaft Sleeve Lantern Ring Pump shaft

Packing Gland Packing Retainer

ITEM

NO.

11X 12A 12B 13A 13G 14A 16D 16L 17E 17S 18A

PART

NAME

Gasket

Key Coupling Key Packing Ring Water Slinger

Seal Seat Plug Plug

O-Ring Gasket O-Ring Gasket

Bearings

ITEM

NO.

18B 19A 19B 20J 23B 26J 26K 61J 61P 98M 23A 23C

PART

NAME

Bearings Bearing Caps Bearing Caps

Base Coupling Half

Bearing Housing Bearing Housing Retaining Rings Retaining Rings

Roll Pin Coupling Half

Grid

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• Replace wear rings (4A) on impeller (3D). Replace with seals or packing. Replace bearing housing (26K) on shaft (6A) not to damage seal (14A). Replace bear-ing (18A) into outboard housing and washer and snap ring. Replace coupling key (12B) with coupling half (23B).

• For packing type pumps, follow steps under Bearing Replacement ; then steps under Packing Replace-ment, each side.

V. ORDERING PARTS

• PACO Pumps has over 90 years of experience in the design, manufacture, and application of centrifugal pumps and pumping systems. PACO's commitment to state-of-the-art pump design and quality manufac-turing assures maximum user benefits with optimum equipment life at lower cost.

• PACO’s commitment to their customers continues through an extensive service organization. Highly trained technicians can assist customers with initial startup, troubleshooting, repair, and system analy-sis.

PACO maintains an extensive stock of replacement parts and parts kits for our pumps. In order to reduce pump repair time and shorten inconvenient pump service inter-ruptions, it is suggested that the pump user stock spare parts. For suggested spare parts see Replacement Parts Guide B1b.2, attached, and contact your local PACO Sales Representative (see back cover for the number of your nearest PACO sales office). Since spare parts re-quirements and quantities vary for specific pump construc-tions, allow your PACO Representative to help in defining your spare part requirements. To ensure that the proper replacement parts are ordered for your particular pump model, when you call:

• Identify all pertinent data from the pump name plate (see Pump Identification ). This should always include the pump Catalog or Model Number, and the pump Serial Number.

• For replacement impellers, also include from the name-plate the operating conditions (GPM and TDH) and the impeller diameter.

• Identify all parts by item number and description as indicated by the appropriate assembly drawing in this manual, for your particular pump model.

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B. POSSIBLE CAUSES

1. The pump has not been properly bled of air.

2. The pump suction line has not been completely primed.

3. The suction head (NPSHR) required by the pump is too high, or the net positive suction head available (NPSHA) at your facility is too low.

4. The fluid pumped contains too much entrained air or gas.

5. There are air pockets in the suction line.

6. An entry of air has suddenly occurred in the suction line.

7. An entry of air past the shaft seal into the pump has occurred.

8. The inlet of the suction line is insufficiently submerged.

9. The suction valve is closed or only partially open.

10. The suction strainer is clogged with dirt or debris.

11. The foot valve is clogged or undersized.

12. Little or no cooling fluid supplied to the shaft seals.

13. The lantern ring is not positioned opposite the flushing inlet, thereby restricting fluid flow.

14. Pump drive rotational speed too low.

15. Pump drive rotational speed too high.

16. Pump rotation wrong or impeller installed back-wards.

17. Total head of installation (back Pressure) higher than rated total head of the pump.

18. Total head of installation (back Pressure) lower than rated total head of the pump.

19. Density of fluid pumped differs from that specified when the pump was purchased.

20. Viscosity of fluid pumped differs from that specified when the pump was purchased.

21. The pump is operating at too low a rate of flow (The discharge valve may be throttled too much).

22. If pumps are operating in parallel, the pump char-acteristics may not be suitable for parallel operation.

23. The impeller may be clogged with debris.

24. The impeller may be damaged.

SYMPTOMS CAUSE CODE

1*2*3*4*5*6*7*8*9*10*11*14*16*17*22*23*24*34 2*3*4*5*6*7*8*9*10*11*12*13*22*23*24*34 1*3*9*10*11*21*22*27*29*30*31*33*34*40*41 2*3*4*5*6*7*8*9*10*11*14*16*17*20*21*22*23*24*25*26*34 15*18*20*34 4*14*16*18*20*22*23*24*25*26*34 27*28*29*30*33*34*35*36*39*41 12*13*27*28*29*30*33*34*35*36*37*38*39*41 15*16*18*19*20*23*25*27*28*31*33*34*35*37*38*44 2*3*4*5*6*7*8*9*10*11*15*17*18*21*23*24*27*28*29*30* 31*32*33*34*40*41*42*45*46* 27*28*29*30*31*32*33*34*40*41*42*43*44*45*46

Pump does not deliver any liquid at start-up.

Pump stops delivering liquid after start-up.

Pump overheats and/or ceases to deliver liquid.

Insufficient flow rate.

Excessive flow rate.

Discharge pressure is too high.

Shaft seal leaks appreciably, or the packing leaks excessively.

Shaft seal or packing fails prematurely.

Pump uses too much power.

Pump runs rough and noisily.

Bearings overheat and/or fail prematurely.

VI. TROUBLE SHOOTING

A.

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TROUBLE SHOOTING-POSSIBLE CAUSES (Cont'd)

25. The casing and impeller wear rings may be exces-sively worn.

26. There may be internal leakage from the discharge to the suction compartments as the result of internal gasket failure.

27. There may be a misalignment of the pump shaft.

28. The shaft may chatter because it is bent.

29. The pump may run rough due to improper balancing of the impeller.

30. The shaft may not be running due to worn bearings.

31. The impeller may be rubbing against the inside of the case.

32. The concrete pad…