Carver Pump RSA Manual

RS –Multi-Stage, Centrifugal Pump
INSTALLATION, OPERATION AND
MAINTENANCE INSTRUCTIONS
This manual shall always be kept close to the unit’s location of operation or directly on the pump set.
Part Number: _______________________________________
Serial Numbers: _____________________________________
These operating instructions contain fundamental information and precautionary notes. Please read the manual
thoroughly prior to installation of unit, electrical connection and commissioning. It is imperative to comply with all
other operating instructions referring to components of individual units.
I-280
280 –16.03.EN
ATEX
Inch Units
For Units Built After December 2015
ATEX REV.0
Inch Units

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
MANUFACTURER: CARVER PUMP COMPANY
2415 PARK AVE.
MUSCATINE, IOWA, USA 52761
PRODUCT DESCRIPTION: RS –Multi-Stage, Centrifugal Pump
PART NUMBER:
SERIAL NUMBER:
DATE MANUFACTURED:
APPLICABLE EUROPEAN DIRECTIVES:
Machinery: The designated product complies with the following basic requirements of Directive 2006/42/EC:
Appendix I, section 1.1.2, 1.1.3., 1.1.5., 1.3.1., 1.3.2., 1.3.3., 1.3.4., 1.3.7., 1.3.8., 1.4.1., 1.4.2.1.,
1.5.1., 1.5.8., 1.5.9., 1.5.13., 1.6.1., 1.6.4., 1.6.5., 1.7.
ATEX: 94/9/EC
APPLICABLE INTERNATIONAL STANDARDS:
Machinery: EN ISO 12100:2010 EN ISO 13732-1:2008
EN 626-1:2008 EN ISO 13857:2008
ATEX: EN 1127-1, EN 13463-1, EN 13463-5
NOTIFIED BODY
Det Norske Veritas, ATEX NB 0575 retains a copy of the Technical File
ATEX product marking: II 2 G c T2
The product described in this Declaration of Conformity complies with the Applicable European Directives and
relevant sections of the Applicable International Standards. The signature on this document authorizes the distinctive
European mark to be applied to the equipment described. A Technical Construction File is available for inspection by
designated bodies
Authorized Signature: Date:
Important safety information is contained in the installation, operation and service manuals; read and
understand this information prior to installing or using this equipment
This Document applies only to the equipment described above and is invalid if not reproduced in its entirety.
EC Declaration of Conformity
www.carverpump.com
Phone: [phone]
Email: [e-mail]
Kurt Doren
Quality/ ISO Manager

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
SERVICE RECORD PAGE
Service No. ______________________Model _________________________ Size and Type _______________
Customer Order No. ____________________________Date Installed __________________________________
Installation Date
Location
Application
PUMP RATING
Capacity _____________________________________ Total Head ____________________________________
Suction Pressure ______________________________ Speed (RPM) __________________________________
Liquid pumped ________________________________ Temperature ___________________________________
Specific Gravity _______________________________ Viscosity ______________________________________
Service ______________________________________
PUMP MATERIALS
Casing _________________________ Impeller _______________________ Shaft _______________________
Gaskets _____________________________________ Bearing Frame _________________________________
Mechanical Seal/Packing ________________________
MOTOR DATA
Motor __________________________ Make _________________________ Serial No. ___________________
Type ___________________________ Frame ________________________ AC or DC ___________________
HP _____________________________ RPM _________________________ Volts _______________________
Phase __________________________ Cycles ________________________

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
NOTES ON INSPECTION AND REPAIRS
INSPECTION DATE
REPAIR TIME
REPAIRS
COST
REMARKS

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
INSTALLATION, OPERATION AND
MAINTENANCE INSTRUCTIONS
TABLE OF CONTENTS
SECTION/PARAGRAPH PAGE
I. GENERAL DESCRIPTION...............................1
A. General Information ...................................1
B. ATEX Directive 94/9/EC.............................1
C. Disclaimer ..................................................1
D. Personnel Qualification and Training.........1
E. Pump Identification.....................................1
F. Parts Inventory Guide ................................2
G. Parts Ordering............................................2
II. SAFETY............................................................2
A. Safety Precautions.....................................2
B. Summary of Safety Marking.......................2
C. Products Used in Potentially Explosive
Atmospheres.........................................2
D. Scope of Compliance.................................2
E. Safety Awareness ......................................3
F. Safety Instructions for the Operator/User ..3
G. Safety Instructions for Maintenance
Inspection and Installation Work............3
H. Non-Compliance with Safety Instructions..3
I. Unauthorized Modification and
Manufacture of Spare Parts...................3
J. Unauthorized Modes of Operation.............4
K. Explosion Protection ..................................4
III. EQUIPMENT DESCRIPTION...........................7
IV. EFFECTS OF FLUIDS .....................................8
A. Net Positive Suction Head (NPSH)............8
B. Changing Pump Speed..............................8
C. Effects of Viscosity.....................................8
D. Effects of Specific Gravity..........................8
V. TECHNICAL DATA...........................................8
VI. INSPECTION AND STORAGE ........................16
A. Inspection...................................................16
B. Packing for Return .....................................16
C. Storage of Pump........................................16
VII. INSTALLATION................................................17
A. Location......................................................17
B. Handling.....................................................17
C. Foundation .................................................17
SECTION/PARAGRAPH PAGE
D. Leveling of Unit.......................................... 18
E. Grouting ..................................................... 18
F. Coupling Alignment.................................... 20
G. Pre-Installation Procedures ....................... 21
H. Piping......................................................... 21
I. Auxiliary Piping Connection
and Gauges ........................................... 21
J. Motor.......................................................... 21
K. Direction of Rotation .................................. 21
VIII. OPERATION .................................................... 22
A. Pre-Start Cautions ..................................... 22
B. Priming....................................................... 22
C. Starting the Pump...................................... 23
D. Turbine Applications .................................. 23
E. Minimum/Maximum Flow Calculations ...... 23
F. Operating Checks...................................... 23
G. Stopping the Pump .................................... 23
H. Indefinite Shutdown ................................... 24
IX. TROUBLESHOOTING OPERATING
PROBLEMS...................................................... 24
X. MAINTENANCE ............................................... 26
A. Lubrication of Pump Bearings.................... 26
B. Lubrication of Motor Bearings.................... 27
C. Torque Values............................................ 27
XI. SERVICE AND REPAIR................................... 28
A. Preparations for Disassembly of Pump ..... 28
B. Disassembly of Pump with
Standard Sleeve Bearing....................... 29
C. Disassembly of Pump with
Optional Mechanical Seals .................... 31
D. Parts Inspection......................................... 33
E. Reassembly of Pump with
Standard Sleeve Bearing....................... 35
F. Reassembly of Pump with
Optional Mechanical Seals .................... 39
G. Replacement of Wear Ring........................ 42
H. Motor.......................................................... 44
I. Check Valve............................................... 44
XII. PARTS LISTS AND DRAWINGS..................... 44

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
TABLE OF CONTENTS - Continued
LIST OF TABLES
NUMBER TITLE PAGE
1. Fluid Temperature Limits........................... 5
2. Maximum Allowable Pressures.................. 6
3. Axial Impeller Alignment
Control Dimensions................................ 9
4. Shaft Dimensions....................................... 12
5. Sleeve Bearing Dimensions....................... 12
6. Standard Design Pump Mechanical
Seal Settings.......................................... 12
7. Optional Design Pump Mechanical
Seal Settings.......................................... 13
8. Key Mechanical Data................................. 13
9. Permissible Nozzle Loads ......................... 15
10. Minimum Flow Rates RS-6 and RS-9........ 15
11. Pumping Unit Troubleshooting .................. 24
12. Oil Recommendations................................ 27
13. Bearing Cooling Flow Rates
(30 PSIG Max.)...................................... 27
14. Recommended Torque Values (ft-lbs)....... 27
15. Recommended Equipment ........................ 27
16. Factory Wear Ring Clearance (Inches) ..... 34
17. New Wear Ring Diametrical
Clearance Limits (Inches)...................... 43
18. Recommended Spare Parts List................ 45
LIST OF ILLUSTRATIONS
NUMBER TITLE PAGE
1. Seal Chamber Dimensions.........................11
2. Standard Seal Flush Plans.........................13
3. Bearing Frame Water Cooling....................14
4. Sling Position for Moving Pump..................17
5. Sling Position for Moving Pumping Unit .....17
6. Sling Position for Moving
Pumping Unit with Lifting Lugs ...............17
7. Grouting and Foundation Bolting................19
8. Unit Leveling...............................................19
9. Coupling Alignment.....................................20
10. Constant Level Oiler...................................27
11. Bushing Not Torqued Interference .............38
12. Mechanical Seal Not Torqued
Interference.................................................42
13. Sectional Assembly –Standard
Sleeve Bearing .......................................49
14. Sectional Assembly –Optional
Mechanical Seals....................................51
15. Cooling Options ..........................................52

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
1
I. GENERAL DESCRIPTION AND
SAFETY PRECAUTIONS.
A. GENERAL INFORMATION. Carver Pump
Company products are carefully engineered and
manufactured and, if properly installed, maintained, and
operated, should provide maintenance-free operation
and a long service life.
CAUTION
These instructions must always be kept close
to the product's operating location or directly
with the product.
This manual is designed to provide sufficient material to
properly maintain the total pumping unit. The information
presented should improve your knowledge and
understanding of the RS Multi-Stage Centrifugal Pump,
thus upgrading the reliability, service life, and quality of
pump maintenance.
These operating instructions are intended to facilitate
familiarization with the product and its permitted use to
help satisfy ATEX safety requirements. These operating
instructions do not take into account local regulations;
the operator must ensure that such regulations are
strictly observed by all, including the personnel called in
for installation. Compliance with such laws relating to
the proper installation and safe operation of the pumping
equipment is the responsibility of the equipment owner
and all necessary steps should be taken by the owner to
assure compliance with such laws before operating the
equipment. These instructions are intended to facilitate
familiarization with the product and its permitted use to
help satisfy safety requirements. Always coordinate
repair activity with operations personnel, and follow all
plant safety requirements and applicable safety and
health laws/regulations.
Refer to Figures 13, 14, and 15 to locate the pump parts
by item number. Variations do exist between
configurations, not all parts described in the text may be
on your configuration.
CAUTION
These instructions should be read prior to
installing, operating, using and maintaining the
equipment in any region worldwide and in
conjunction with the main user instructions
provided. The equipment must not be put into
service until all the conditions relating to safety
instructions have been met.
B. ATEX DIRECTIVE 94/9/EC. It is a legal
requirement that machinery and equipment put into
service within certain regions of the world shall conform
to the applicable CE Marking Directives for Equipment
for Potentially Explosive Atmospheres (ATEX).
Where applicable the Directive covers important safety
aspects relating to the equipment, its use and the
satisfactory provision of technical documents. Where
applicable this document incorporates information
relevant to these Directives. To establish if the product
itself is CE marked for a Potentially Explosive
Atmosphere check the nameplate and the Certification
provided.
C. DISCLAIMER. Information in these User
Instructions is believed to be reliable. In spite of all the
efforts of Carver Pump Company to provide sound and
all necessary information the content of this manual may
appear insufficient and is not guaranteed by Carver
Pump Company as to its completeness or accuracy.
D. PERSONNEL QUALIFICATION AND TRAINING.
All personnel involved in the operation, installation,
inspection and maintenance of the unit must be qualified
to carry out the work involved. If the personnel in
question do not already possess the necessary
knowledge and skill, appropriate training and instruction
must be provided. If required the operator may
commission the manufacturer/supplier to provide
applicable training.
Follow instructions in this manual carefully. Factory
warranty applies only when pump operates under
conditions as specified on order acknowledgment, and if
pump is properly installed and maintained as
recommended herein. A copy of this manual should be
available to operating personnel. Additional copies of
this manual are available upon request from Carver
Pump Company and your local distributor. For
comments and/or questions about information provided,
please contact Carver Pump Company or your local
distributor.
E. PUMP IDENTIFICATION. The type of pump, pump
size, operating data, and serial number are all stamped
on the nameplate attached to the pump. Pump
specifications should be recorded upon receipt of the
pumping unit. Record all necessary information on the
pump service record page and inspection and repair
record provided at the front of this manual. This
information must be included in all correspondence
regarding the unit. This will ensure that the correct pump
and/or parts are ordered in a timely manner.

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
2
F. PARTS INVENTORY GUIDE. To avoid
unnecessary delays for maintenance, spare parts
should be readily available, purchase before and keep in
stock, for normal service. Most conditions will be
covered if this manual is followed. For every one to
three pumps, stock one spare set consisting of items
listed in Table 19, Recommended Spare Parts. Part
numbers correspond to Figures 11, 12 and 13.
G. PARTS ORDERING. When ordering replacement
parts, please specify:
Serial number of pump (located on nameplate)
Part name (located on parts list)
Quantity of parts needed
Carver Pump Company may ship an interchangeable
part that is not identical in appearance or symbol. This is
done only if the part has been improved. Examine parts
carefully upon delivery before questioning factory or
company representative. Never return parts to the
factory without authorization from Carver Pump
Company.
If an impeller is ordered, specify diameter across blade
tips. Be sure diameter was NOT trimmed further than
diameter shown on Carver Pump Company records.
If a driver or driver parts are ordered, specify name of
manufacturer and all other data found on the driver
nameplate.
II. SAFETY.
A. SAFETY PRECAUTIONS. The manual is designed
to provide adequate instructions for the safe and
efficient installation, operation, or maintenance of the
pump. Failure or neglect to properly install, operate, or
maintain the pump may result in personal injury,
property damage, or unnecessary damage to the pump.
This manual must be read and understood both by the
installing personnel and the responsible trained
personnel/operators prior to installation and operation,
and it must always be kept close to the location of the
pumping unit for easy access.
B. SUMMARY OF SAFETY MARKING. The safety
instructions contained in this manual follow specific
ATEX safety marking where non-observance of the
instruction will cause a hazard is specially marked with
the symbol:
This symbol indicates explosive
atmosphere marking according to ATEX. It is
used in safety instructions where non-
compliance in the hazardous area would cause
the risk of an explosion.
General hazard sign to ISO 7000 - 0434.
The word "Caution" is used to introduce safety
instructions whose non-observance may lead to damage
to the machine and its functions.
Instructions attached directly to the machine, e.g.
Arrow indicating the direction of rotation
Markings for fluid connections must always be
complied with and be kept in a perfectly legible
condition at all times.
Observe all notes, caution or danger tags attached to
the equipment or included in this manual.
C. PRODUCTS USED IN POTENTIALLY EXPLOSIVE
ATMOSPHERES
Measures are required to:
Avoid excess temperature
Prevent buildup of explosive mixtures
Prevent the generation of sparks
Prevent leakages
Maintain the pump to avoid hazard
The following instructions for pumps and pump units
when installed in potentially explosive atmospheres
must be followed to help ensure explosion protection.
Both electrical and non-electrical equipment must meet
the requirements of European Directive 94/9/EC.
D. SCOPE OF COMPLIANCE.
Use equipment only in the zone for which
it is appropriate. Always check that the driver,
drive coupling assembly, seal and pump
equipment are suitably rated and/or certified for
the classification of the specific atmosphere in
which they are to be installed.
Where Carver Pump has supplied only the bare shaft
pump, the Ex rating applies only to the pump. The party
responsible for assembling the pump set shall select the

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
3
coupling, driver, seal and any additional equipment, with
the necessary CE Certificate/Declaration of Conformity
establishing it is suitable for the area in which it is to be
installed.
The output from a variable frequency drive (VFD) can
cause additional heating affects in the motor and so, for
pump sets with a VFD, the ATEX Certification for the
motor must state that it covers the situation where
electrical supply is from the VFD. This is particular
requirement still applies even if the VFD is in a safe
area.
E. SAFETY AWARENESS. It is imperative to comply
with the safety instructions contained in this manual, the
relevant national and international explosion protection
regulations, health and safety regulations and the
operator’s own internal work, operation and safety
regulations.
Ex symbol relates to additional
requirements which must be adhered to when
the pump is operated in potentially explosive
atmospheres.
F. SAFETY INSTRUCTIONS FOR THE OPERATOR
/USER.
Any hot or cold components that could pose a
hazard must be equipped with a guard by the
operator.
Guards which are fitted to prevent accidental
contact with moving parts (e.g. coupling) must
not be removed whilst the unit is operating.
Leakages (e.g. at the shaft seal) of hazardous
fluids (e.g. explosive, toxic, hot) must be
contained so as to avoid any danger to persons
or the environment. Pertinent legal provisions
must be adhered to.
Electrical hazards must be eliminated. (In this
respect refer to the relevant safety regulations
applicable to different countries and/or the local
energy supply companies.)
If the pumps/units are located in
potentially explosive atmospheres, it is
imperative to make sure that unauthorized
modes of operation are prevented. Non-
compliance may result in the specified
temperature limits being exceeded.
G. SAFETY INSTRUCTIONS FOR MAINTENANCE,
INSPECTION AND INSTALLATION WORK. The
operator is responsible for ensuring that all
maintenance, inspection and installation work be
performed by authorized, qualified personnel who are
thoroughly familiar with the manual and pumping unit.
To ensure safe operation the ball
bearings must be replaced at 20000 hours of
service or whenever the mechanical seal is
inspected or serviced.
The pumping unit must have cooled down to ambient
temperature, pump pressure must have been released
and the pump must have been drained before working
on any pumping unit. Work on the pumping unit must be
carried out during shutdown. The shutdown procedure
described in the manual for taking the unit out of service
must be adhered to.
Pumps handling fluids that are hazardous to personnel
must be decontaminated prior to being worked on.
Immediately following completion of the work, all safety
relevant and protective devices must be reinstalled
and/or reactivated. Please observe all instructions set
out in the Section VIII on start up before returning the
pumping unit to service.
H. NON-COMPLIANCE WITH SAFETY
INSTRUCTIONS. Non-compliance with safety
instructions may result in personal injury, property
damage, or unnecessary damage to the pumping unit.
Non-compliance with these safety instructions will also
lead to forfeiture of any and all rights to claims for
damages. Non-compliance, can for example, result in:
Failure of important pumping unit functions.
Failure of prescribed maintenance and servicing
practices.
Hazard to personnel by electrical, mechanical,
and chemical effects as well as explosion.
Hazard to the environment due to leakage of
hazardous substances.
I. UNAUTHORIZED MODIFICATION AND
MANUFACTURE OF SPARE PARTS. Modifications or
alterations of the pumping unit supplied are only
permitted after consultation with Carver Pump and to the
extent permitted by Carver Pump. Original spare parts
and accessories authorized by Carver Pump ensure
safety. The use of other parts can invalidate any liability
of Carver Pump for consequential damage and/or
warranty.

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
4
J. UNAUTHORIZED MODES OF OPERATION. The
warranty relating to operating reliability and safety of the
unit supplied is only valid if the pumping unit is used in
accordance with its designated use as described in the
following sections. The limits stated on the nameplate
must not be exceeded under any circumstances.
K. EXPLOSION PROTECTION. If the pumps/units are
installed in potentially explosive atmospheres, the
measures and instructions given in the following
sections K.1 to K.6 must be adhered to without fail, to
ensure explosion protection.
K.1 Unit Fill.
It is assumed that the system of suction
and discharge lines and thus the wetted pump
internals are completely filled with the fluid to
be handled at all times during pump operation,
so that an explosive atmosphere is prevented.
If the operator cannot warrant this
condition, appropriate monitoring devices must
be used.
CAUTION
In addition, it is imperative to make sure that
the seal chambers, auxiliary systems of the
shaft seal and the heating and cooling systems
are properly filled.
K.2 Marking.
The marking on the pump only refers to
the pump, i.e. the coupling and driver must be
regarded separately. The coupling must have
an EC manufacturer’s declaration. The driver
must be regarded separately.
An example of ATEX equipment marking is shown
below. The actual classification of the pump will be
engraved on the nameplate.
II 2 GD c IIC 135 ºC (T4)
Equipment Group
I = Mining
II = Non-mining
Category
2 or M2 = high level protection
3 = normal level of protection
Gas and/or dust
G = Gas
D = Dust
c = Constructional safety
(in accordance with EN13463-5)
Gas Group (Equipment Category 2 only)
IIA –Propane (typical)
IIB –Ethylene (typical)
IIC –Hydrogen (typical)
Maximum surface temperature (Temperature Class)
(Refer to Section II, Paragraph K.5)
K.3 Checking the Direction of Rotation.
If the explosion hazard also exists during
the installation phase, the direction of rotation
must never be checked by starting up the
unfilled pump unit, even for a short period, to
prevent temperature increases resulting from
contact between rotating and stationary
components.
K.4 Pump Operating Mode.
Make sure that the pump is always started up with the
suction-side shut-off valve fully open and the discharge-
side shut-off valve slightly open. However, the pump can
also be started up against a closed swing check valve.
The discharge-side shut-off valve shall be adjusted to
comply with the duty point immediately following the run-
up process.

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
5
Pump operation with the shut-off valves in
the suction and/or discharge pipes closed is not
permitted.
CAUTION
In this condition, there is a risk of the pump
casing taking on high surface temperatures
after a very short time, due to a rapid
temperature rise in the pumped fluid inside the
pump. Additionally, the resulting rapid pressure
build-up inside the pump may cause excessive
stresses on the pump materials or even
bursting.
The minimum flows calculated in Section VIII,
Paragraph E, refer to water and water-like liquids.
Longer operating periods with these liquids and at the
flow rates indicated will not cause an additional increase
in the temperatures on the pump surface. However, if
the physical properties of the fluids handled are different
from water, it is essential to check if an additional heat
build-up may occur and if the minimum flow rate must
therefore be increased.
To check, proceed as described in Section VIII,
Paragraph E.
In addition, the instructions given in Section VIII of this
operating manual must be observed.
Mechanical seals may exceed the
specified temperature limits if run dry. Dry
running may not only result from an
inadequately filled seal chamber, but also from
excessive gas content in the fluid handled.
Pump operation outside its specified operating range
may also result in dry running.
K.5 Temperature Limits.
In normal pump operation, the highest
temperatures are to be expected on the surface
of the pump casing, at the shaft seal and in the
ball bearing areas. The surface temperature at
the pump casing corresponds to the
temperature of the fluid handled.
If the pump is heated, it must be ensured that the
temperature classes stipulated for the plant are
observed.
In the ball bearing bracket area, the unit surfaces must
be freely exposed to the atmosphere and the fan inlet
flow must be unimpeded.
In any case, responsibility for compliance
with the specified fluid temperature (operating
temperature) lies with the plant operator. The
maximum permissible fluid temperature
depends on the temperature class to be
complied with.
Table 1 below lists the temperature classes to EN
13463-1 and the resulting theoretical temperature limits
of the fluid handled. In stipulating these temperatures,
any temperature rise in the shaft seal area has already
been taken into account.
Table 1. Fluid Temperature Limits
Temperature class
to EN 13463-1:
Temperature limit of
fluid handled
T5
185 °F (85 °C)
T4
284 °F (120 °C)
T3
365 °F (185 °C)
T2
536 °F (280 °C)
T1
662 °F (350 °C)
CAUTION
The permissible operating temperature of the
pump in question is indicated on the data
sheet. If the pump is to be operated at a higher
temperature, the data sheet is missing or if the
pump is part of a pool of pumps, the maximum
permissible operating temperature must be
enquired from the pump manufacturer.
Based on an ambient temperature of 104˚ Fahrenheit
(F) [40˚Celsius (C)] and proper maintenance and
operation, compliance with temperature class T4 is
warranted in the area of the rolling element ball
bearings. A special design is required for compliance
with temperature class T6 in the ball bearing area. In
such cases, and if ambient temperature exceeds 104˚F
(40˚C), contact the manufacturer.

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
6
Pump liquids over 225˚F (107˚C); pumps
must be equipped with auxiliary cooling.
Pumps of high temperature construction are provided
with cooled ball bearings for a unit operating in
temperature range between 225˚F and 300˚F (107˚C
and 149˚ C). Cooling water flows through cavities of the
bearing frame and keeps temperature of the ball
bearings within acceptable limits. Refer to Table 13 for
cooling flow rates of water temperature of 60˚F (140˚C)
for ball bearings.
K.6 Maintenance.
Only a pumping unit which is properly
serviced and maintained in perfect technical
condition will give safe and reliable operation.
This also applies to the reliable function of the thrust or
radial ball bearings whose actual lifetime largely
depends on the operating mode and operating
conditions. Regular checks of the lubricant and the
running noises will prevent the risk of excessive
temperatures as a result of the thrust or radial ball
bearings running hot or defective bearing isolators.
The correct function of the bearing isolators must be
checked regularly. Any auxiliary systems installed must
be monitored, as necessary, to make sure that they
function correctly.
K.7 General Safety Instructions.
Various federal, state, and local laws affect
installation, use, and operation of pumping
equipment. Compliance with such laws relating
to proper installation and safe operation of
pumping equipment is the responsibility of the
equipment owner.
Prior to working on pump or driver, ensure all
switches and circuit breakers have been locked
in the open (off) position and tagged, “Out of
Service.”
All circuits NOT known to be dead must be
considered live at all times.
DO NOT wear loose or torn clothing around
rotating machines.
While working near electricity, DO NOT use
metal rules, flashlights, metallic pencils, or any
other objects having exposed conducting
material.
Make sure you are NOT grounded while
adjusting electrical equipment or using
measuring equipment.
In general, use only one hand when servicing
live electrical equipment.
Make sure to de-energize all electrical
equipment before connecting or disconnecting
meters or test leads.
For connecting a meter to terminals for
measurement, use a range higher than the
expected voltage.
Check to make sure that the frame of the driver
and starter panel are securely grounded before
operating pumping unit or performing any tests
or measurements.
If a test meter must be held or adjusted while
voltage is applied, ground case of meter before
starting measurement. DO NOT touch live
equipment while holding the meter. Some
moving vane-type meters should not be
grounded nor held during measurements.
DO NOT use test equipment known to be
damaged or in poor condition.
The following specific safety precautions apply to the
pumping unit:
Hydro suction case separately on RS-9 units.
Isolate pump for system hydro.
DO NOT exceed maximum rated suction
pressure unless otherwise rated.
DO NOT exceed maximum rated discharge
pressure.
Table 2. Maximum Allowable Pressures
Size
Suction
Discharge
A
415 PSIG*
1,475 PSIG
B
1,475 PSIG
C
1,475 PSIG
D
1,810 PSIG
E
1,460 PSIG
*Unless otherwise rated.

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
7
III. EQUIPMENT DESCRIPTION.
RS high-pressure pumps are multi-stage, centrifugal
pumps with radially split casings. The pump consists of
a suction case, a discharge case, plus a number of
interstage casings, all secured with tie bolts. Suction
casing, interstage casings and diffusers are provided
with wear rings. Diffusers are provided with bushings.
Due to prolonged operation, wear rings and bushings
may become worn and/or damaged. Replace all worn
and/or damaged parts with new.
RS high-pressure pumps incorporate special design
refinements, which help to absorb the appreciable axial
thrust generated by their high head operation. Residual
axial thrust is absorbed by the thrust bearings.
CAUTION
Be careful not to mix RS6 and RS9 parts
since RS6 parts are not rated for the pressure
of the RS9.
ATEX and CE require bearing isolators
and metal splash guards to meet requirements.
Other customers may use oil seals and plastic
splash guards.
The bare pump consists of following major parts and
options. Refer to Figures 11 and 12, for the location of
parts identified by item numbers.
Item 1 –Discharge Case. The Discharge Case (1)
houses the impeller (2A or 2X) and diffuser (5A or 5X).
The discharge case is fastened to the suction case with
tie bolts (173) and tie bolt nuts (616) with tie bolt
washers (645).
Item 2A –Impeller, 1st Stage. RS pumps are
equipped with enclosed impellers. The impeller (2A) is
keyed to the shaft (6) by the impeller key (32A) and
located by sleeves and shims. If the RS pump is only a
one stage pump then only the 1st stage impeller is used.
All impellers face the same direction on the shaft.
Item 2X –Impeller. RS pumps are equipped with
enclosed impellers. The impeller (2X) is keyed to the
shaft (6) by the impeller key (32A) and located by
interstage sleeves (58) and shims. All impellers face the
same direction on the shaft.
Item 5A –Diffuser. Diffusers (5A) are inserted in
individual interstage casings. Diffusers are provided with
diffuser bushings (63) and hold wear rings (7X).
Item 5X –Last Stage Diffuser. The last stage diffuser
is located in the discharge case (1). Holds wear ring
(7X) and sits on sleeve bearing (63X).
Item 6 –Shaft. The pump shaft is protected against
wear by interstage sleeves, spacer sleeves, and shaft
sleeves. The shaft (6) of the RS pump is designed for
maximum deflection of 0.002 inch at the face of the
mechanical seal (90). The shaft is also designed to
provide stabilization to the rotor system when pump
operates away from the best efficiency point. A coupling
connects the shaft to the driver shaft. The pump
coupling key (46) holds the coupling in place, causing it
to rotate with the shaft.
Item 16 and 18 –Ball Bearings. A deep-groove
Conrad-type, C3 internal fit radial ball bearing and a
back-to-back mounted ball bearing are housed in the
bearing frame (99) depending on design. The ball
bearings will be designated as 7000 series. Ball
bearings designated in the 7000 series will be duplex
40° angular contact ball bearings. The ball bearing is
held in place by the bearing jam nuts (22). The bearings
are oil lubricated by oil bath.
Item 99 –Bearing Frame. The principal function of the
bearing frame (99) is to carry the loads from the liquid
end of the pump to the base and to transport power from
the power unit to the impeller (2A or 2X). The bearing
frame has a pair of back-to-back mounted angular
contact thrust ball bearings (16). This bearing frame is
designed to be oil lubricated. The bearing frame is
attached to the suction case (9) and discharge case (1)
by tie bolts.
The use of a sight glass constant level oiler (143)
maintains the oil level high enough on the higher of the
two ball bearings so that the ball bearings themselves
provide the motivation for the oil to be moved through
the races of the ball bearings. In addition to the oil lube,
the bearing frame contains the bearing isolator (169).
Item 23 –Base. A grout-able base (23) is designed to
provide adequate support for the pump and motor so
pump can be operated without base deflection,
excessive vibration, or resonance. The pump is attached
to the base with stud (634) and hex nut (614). Grouting
of this type of base is required by Carver Pump
Company.
Item 90 and 91 –Mechanical Seal. Mechanical seals
(90 and 91) are to be used. Complete mechanical seal
instructions should be obtained from the seal
manufacturer. The standard seal chamber dimensions
are shown in Figure 1.
Item 111 –Interstage Case. The interstage case
houses the impeller (2A or 2X) and diffuser (5A). The
interstage casings are all secured with tie bolts to the

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
8
suction (9) and discharge (1) casings. Interstage
casings are provided with wear rings (7X). O-rings (89D)
seal the individual interstage casings. A one stage pump
does not have an interstage case.
IV. EFFECTS OF FLUIDS.
Solids in the fluid pumped may cause
internal damage to pump casing and damage
to the seal faces with resulting Hazardous
conditions. Care is to be taken to ensure that
the process fluid is clear of solids and debris.
A. NET POSITIVE SUCTION HEAD (NPSH). Any
liquid, hot or cold, must be pushed into the impeller of
the pump by some absolute pressure, such as the
atmosphere or the vessel pressure from which the pump
takes its action.
The head in feet of liquid necessary to maintain the
required flow into the pump is called the Net Positive
Suction Head (NPSH). This value is measured above
the vapor pressure of the liquid at the pumping
temperature.
NPSH is commonly expressed in two ways: the NPSH
required by the pump, and shown on the pump curve, is
the head needed to cover the losses in the pump
suction and the energy required to enable the liquid to
climb onboard the leading edge of the impeller vane.
The NPSH available is that inherent in the system,
taking into account friction losses in suction piping,
valves, fittings, etc. In all cases, the NPSH available,
measured above vapor pressure, must exceed the
NPSH required in order to push the liquid into the pump.
B. CHANGING PUMP SPEED. Changing the speed of
a centrifugal pump affects the capacity, total head,
NPSH required and the brake horsepower. In general
the capacity will vary in a direct ratio with the speed,
whereas the total head and NPSH required will vary as
the ratio of the speed squared. The brake horsepower
will vary as the ratio of the speed cubed.
C. EFFECTS OF VISCOSITY. The pump is designed
to deliver rated capacity at rated head for a liquid with a
particular viscosity. When pump is handling heavy
viscous liquid, the viscosity of the liquid must allow it to
be pumped easily. The liquid may have to be heated
prior to starting the pump. When contemplating
operation at some viscosity other than that for which the
pump was originally designed, check with Carver Pump
Company.
D. EFFECTS OF SPECIFIC GRAVITY. The capacity
and total head in feet of liquid developed by a centrifugal
pump are fixed for every point on the curve and are
always the same for the same speed. Neither capacity
nor total head will be affected by a change in the
specific gravity of the liquid pumped. However, since the
discharge pressure in Pounds per Square Inch (PSI)
and the brake horsepower required driving the pump are
functions of the specific gravity of the liquid, both will be
affected in direct proportion by any change in specific
gravity. Therefore, an increase in specific gravity will
raise the discharge pressure and is dangerous as it
might overload the pump's driver, or exceed the pump
casing allowable pressure.
V. TECHNICAL DATA.
Specifications and operating limits should be recorded
on a Service Record Page; an example is located in the
front matter of this manual. Record the necessary
information upon receipt of the pumping unit.
Noise Levels. Noise levels may exceed 85dBa at 1
meter during operation. Ear protection must be worn
whenever working in high noise locations.
Axial Impeller Alignment Control Dimensions. Axial
impeller alignment control dimension are located in
Table 3 and are arranged by pump size.
Seal Chamber Dimensions. Standard seal chamber
dimensions are located in Figure 1 and are arranged by
pump size.
Basic Design Features. Basic design features of the
pump are located in Tables 3, 4, 5, 6, 7, 10, and Figures
2 and 3 and are arranged by pump model.
Key Mechanical Data. Key mechanical data for the
pump is located in Table 8 and is arranged by pump
model.
Permissible Nozzle Loads. The forces and moments
in Table 9 are to be understood as the limit for a single
acting force or moment along the particular coordinate
axes or any resultant of two or more forces and
moment.

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
9
Table 3. Axial Impeller Alignment Control Dimensions
Stages
Pump Size A
(Inches)
Pump Size B
(Inches)
Pump Size C
(Inches)
Pump Size D
(Inches)
Pump Size E
(Inches)
1
1.147
1.150
1.267
1.580
2.093
2
1.144
1.143
1.263
1.635
1.998
3
1.141
1.140
1.260
1.632
1.995
4
1.138
1.137
1.257
1.629
1.992
5
1.135
1.134
1.254
1.626
1.989
6
1.132
1.131
1.251
1.623
1.986
7
1.129
1.128
1.248
1.620
1.983
8
1.126
1.125
1.245
1.617
1.980
9
1.123
1.122
1.242
1.614
N/A
10
1.12
1.119
1.239
1.611
N/A
11
1.117
1.116
1.236
1.608
N/A
12
1.114
1.113
1.233
1.605
N/A
13
1.111
1.110
N/A
N/A
N/A
14
1.108
1.107
N/A
N/A
N/A
15
1.105
1.104
N/A
N/A
N/A
16
1.102
1.101
N/A
N/A
N/A
17
1.099
1.098
N/A
N/A
N/A
18
1.096
1.095
N/A
N/A
N/A
*Additional stages will require compensation for interstage compression, on average .003 inch per stage. Use .010
inch shim as needed. Refer to Section XI, Paragraphs E.

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
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Table 3. Axial Impeller Alignment Control Dimensions - Continued
Stages
Pump Size A
(Inches)
Pump Size B
(Inches)
Pump Size C
(Inches)
Pump Size D
(Inches)
Pump Size E
(Inches)
1
-.110
-.110
-.125
.137
.185
2
-.113
-.113
-.128
.134
.182
3
-.116
-.116
-.131
.131
.179
4
-.119
-.119
-.134
.128
.176
5
-.122
-.122
-.137
.125
.173
6
-.125
-.125
-.140
.122
.170
7
-.128
-.128
-.143
.119
.167
8
-.131
-.131
-.146
.116
.164
9
-.134
-.134
-.149
.113
N/A
10
-.137
-.137
-.152
.110
N/A
11
-.140
-.140
-.155
.107
N/A
12
-.143
-.143
-.158
.104
N/A
13
-.146
-.146
N/A
N/A
N/A
14
-.149
-.149
N/A
N/A
N/A
15
-.152
-.152
N/A
N/A
N/A
16
-.155
-.155
N/A
N/A
N/A
17
-.158
-.158
N/A
N/A
N/A
18
-.161
-.161
N/A
N/A
N/A
Low NPSH
Impeller
See note below
See note below
See note below
See note below
See note below
*Additional stages will require compensation for interstage compression, on average .003 inch per stage. Use .010
inch shim as needed. Refer to Section XI, Paragraphs F.
RSA No NPSH Impeller
RSB .210 –[#of stages X (.003) - Gaps] = NPSH Impeller Setting
RSC .538 –[#of stages X (.003) - Gaps] = NPSH Impeller Setting
RSD .792 –[#of stages X (.003) - Gaps]= NPSH Impeller Setting
RSE .210 –[#of stages X (.003) - Gaps] = NPSH Impeller Setting
2 - 18
1 (Discharge Side)
Low NPSH Impeller
(Suction)

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
11
Figure 1. Seal Chamber Dimensions

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
12
Table 4. Shaft Dimensions
Pump Model
At Impeller (Inches)
At Coupling (Inches)
A
1.437
1.250
B
1.437
1.250
C
1.437
1.250
D
1.574
1.500
E
1.771
1.625
Table 5. Sleeve Bearing Dimensions
Pump Model
Sleeve Bearing New
(Inches)
Sleeve Bearing
Replacement Limits
(Inches)
Sleeve
(Ø = Diameter Measured)
New (Inches)
Replace (Inches)
A
1.758/1.760
Ø > 1.762
1.751/1.749
Ø < 1.746
B
1.758/1.760
Ø > 1.762
1.751/1.749
Ø < 1.746
C
1.758/1.760
Ø > 1.762
1.751/1.749
Ø < 1.746
D
1.972/1.974
Ø >1.976
1.965/1.963
Ø < 1.961
E
2.382/2.384
Ø >2.386
2.375/2.373
Ø < 2.371
Table 6. Standard Design Pump Mechanical Seal Settings
Pump Model
Suction End (Inches)
(from end of sleeve to face of collar)
A
3.100
B
3.100
C
3.100
D
4.322
E
4.500

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
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Table 7. Optional Design Pump Mechanical Seal Settings
Pump
Model
Discharge End (Seal Type 1)
(for reference only) –Inches
(from face of box to face of
collar)
Discharge End (Seal Type
8B1) (for reference only) –
Inches
(from face of box to face of
collar)
Suction end (Seal Type 1 or
21)
- Inches
(from face of box to face of
collar)
A
.750
1.375
1.000
B
.750
1.375
1.000
C
.750
1.375
1.000
D
2.062
1.750
1.312
E
1.792
1.812
1.594
Table 8. Key Mechanical Data
Item
Pump Model
A, B
C
D
E
Maximum Speed
3500 RPM
Max HP –(17-4 PH shaft)
370
370
603
900
Max HP –(416 SS Shaft)
308
308
500
690
WR2of Rotor –1st Stage (lb-In2)
14.6
30.8
36.7
106.5
WR2of Rotor –
each Stage (lb-In2)
10.2
26.7
31.1
94.4
Lubrication Method (Standard)
Oil –ISO Grade 68
L10 Bearing Life (hrs) - Thrust
50,000
L10 Bearing Life (hrs) - Radial
50,000
Radial Bearing Type
307
307
308
309
Thrust Bearing Type
7307
7307
7308
7309
The standard seal flush plans provided with the optional outboard mechanical seal are shown below.
Recirculation from Suction Point to Seal Recirculation from Discharge Point thru a TI
and Heat Exchanger to Seal
Figure 2. Standard Seal Flush Plans
Plan 13
Plan 11
Plan 13
Plan 23
Plan 21

RS –Multi-Stage, I-280
Centrifugal Pump 280 –16.03.EN
14
Figure 3. Bearing Frame Water Cooling
OPTIONAL DESIGN
END VIEW
SIDE VIEW
IN/OUT
¼ NPT
IN/OUT
¼ NPT
OIL
DRAI
N
STANDARD DESIGN