Carver Pump 855 Series, 855-CC, 855-OH Safety, Installation, Operation And Maintenance Instructions
855 – Filtrate Pump
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-855
855-15.04.EN
SAFETY, 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.
I-855
EC Declaration of Conformity
Kurt Doren
Quality/ ISO Manager
www.carverpump.com
Phone: 1-563-263-3410
Email: sales@carverpump.com
855 – Filtrate Pump 855-15.04.EN
MANUFACTURER: CARVER PUMP COMPANY
2415 PARK AVE.
MUSCATINE, IOWA, USA 52761
PRODUCT DESCRIPTION: 855-OH, 855-CC Filtrate Pumps
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.
APPLICABLE HARMONIZED STANDARDS:
Machinery: EN ISO 12100:2010 EN ISO 13732-1:2008
EN 626-1:2008 EN ISO 13857:2008
Declaration of Incorporation of Partly Completed Machinery (valid for 855 pumps supplied without a motor)
The product described in this Declaration of Conformity complies with the Applicable European Directives, EHSRs and
relevant sections of the Applicable International Standards "as a Component". The incorporation of this pump with Electric
Motors that are marked to confirm that they comply with the Low Voltage Directive 2006/95/EC and all the necessary guards,
must be declared in conformity by the assembler.
Declaration of Conformity of Completed Machinery (valid for 855 pumps supplied complete with a motor)
The product described in this Declaration of Conformity complies with the Applicable European Directives, EHSRs and
relevant sections of the Applicable International Standards. Motors for CE marked pumps will have motors that are marked to
confirm that they comply with the Low Voltage Directive 2006/95/EC.
The special technical documentation has been complied according to Annex VII Part B of Directive 2006/42/EC, and will be
made available in electronic form to the authorities of the individual states upon justified request.
NOTE: The 855 pumps are NOT supplied or Declared to ATEX Directive 94/9/EC.
Person authorized to compile the technical documentation:
Kurt Doren, Quality/ISO Manager, Carver Pump Company, 2415 Park Ave, Muscatine Iowa, USA 52761
Authorized Signature: Date: March 2015
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.
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Installation Date
Location
Application
855 – Filtrate Pump 855-15.04.EN
SERVICE RECORD PAGE
Service No. ______________________ Model _________________________ Size and Type _______________
Customer Order No. ____________________________ Date Installed __________________________________
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 ________________________
I-855
INSPECTION DATE
REPAIR TIME
REPAIRS
COST REMARKS
855 – Filtrate Pump 855-15.04.EN
NOTES ON INSPECTION AND REPAIRS
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855 – Filtrate Pump 855-15.04.EN
INSTALLATION, OPERATION AND
MAINTENANCE INSTRUCTIONS
TABLE OF CONTENTS
SECTION/PARAGRAPH PAGE
SECTION/PARAGRAPH PAGE
I. GENERAL DESCRIPTION ............................... 1
A. General Information ................................... 1
B. Machinery Directive 2006/42/EC ............... 1
C. Disclaimer .................................................. 1
D. Personnel Qualification and Training ......... 1
E. Pump Identification..................................... 2
F. Parts Inventory Guide ................................ 2
G. Parts Ordering ............................................ 2
H. Unauthorized Modification and
Manufacture of Spare Parts ..................... 2
I. Unauthorized Modes of Operation ............. 2
II. SAFETY ............................................................ 2
A. Safety Precautions ..................................... 2
B. Summary of Safety Marking ....................... 2
C. Scope of Compliance ................................. 3
D. Safety Awareness ...................................... 3
E. Safety Instructions for the Operator/User .. 3
F. Safety Instructions for Maintenance
Inspection and Installation Work ............ 3
G. General Safety Instructions ........................ 3
H. Non-Compliance with Safety Instructions .. 4
III. EQUIPMENT DESCRIPTION ........................... 4
A. Pump History .............................................. 4
B. Pump Features ........................................... 4
C. Pump Details .............................................. 4
IV. EFFECTS OF FLUIDS ..................................... 5
A. Net Positive Suction Head (NPSH) ............ 5
B. Changing Pump Speed .............................. 6
C. Effects of Viscosity ..................................... 6
D. Effects of Specific Gravity .......................... 6
V. TECHNICAL DATA ........................................... 6
VI. INSPECTION AND STORAGE ........................ 9
A. Inspection ................................................... 9
B. Packing for Return ..................................... 9
C. Storage of Pump ........................................ 9
VII. INSTALLATION ................................................ 10
A. Location ..................................................... 10
B. Handling ..................................................... 10
C. Pre-Installation Procedures ....................... 11
D. Piping ......................................................... 11
E. Auxiliary Piping Connections
and Gauges ........................................... 11
F. Motor .......................................................... 11
G. Direction of Rotation .................................. 12
VIII. OPERATION .................................................... 12
A. Pre-Start Cautions ..................................... 12
B. Priming ....................................................... 12
C. Starting the Pump ...................................... 12
D. Operating Checks ...................................... 12
E. Stopping the Pump .................................... 13
F. Indefinite Shutdown ................................... 13
IX. TROUBLESHOOTING OPERATING
PROBLEMS ...................................................... 13
X. MAINTENANCE ............................................... 16
A. Lubrication of Pump Bearings .................... 16
B. Lubrication of Motor Bearings .................... 16
C. Torque Values ............................................ 16
XI. SERVICE AND REPAIR ................................... 17
A. Preparations for Disassembly of Pump ..... 17
B. Disassembly of Pump ................................ 18
C. Parts Inspection ......................................... 19
D. Reassembly of Pump ................................. 20
E. Replacement of Packing ............................ 22
F. Replacement of Mechanical Seal .............. 23
G. Belt Installation and Adjustment ................ 24
H. Optional Swing-out Mount Installation ....... 26
I. Motor .......................................................... 27
J. Check Valve ............................................... 27
XII. PARTS LISTS AND DRAWINGS ..................... 27
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855 – Filtrate Pump 855-15.04.EN
TABLE OF CONTENTS - Continued
LIST OF TABLES
NUMBER TITLE PAGE
1. Estimated Noise Characteristics .................. 7
2. Key Component Materials ........................... 8
3. Key Mechanical Data ................................... 8
4. Pumping Unit Troubleshooting .................. 14
5. Recommended Torque Values .................. 16
6. Recommended Tools ................................. 16
7. Belt Tensioning .......................................... 26
8. Parts List .................................................... 28
9. Recommended Spare Parts ...................... 29
LIST OF ILLUSTRATIONS
NUMBER TITLE PAGE
1. Model 855-OH Pump ................................... 4
2. Optional Swing-out ...................................... 5
3. Stuffing Box Dimensions.............................. 7
4. Transport of the Bare Pump ........................ 10
5. Transport of Close-Coupled Pump .............. 10
6. Transport of Complete Unit.......................... 10
7. Removing Packing with Hook ...................... 22
8. Packing Alignment ....................................... 23
9. Mechanical Seal .......................................... 23
10. Belt Tensioning ............................................ 25
11. Swing-out Assembly .................................... 26
12. Drilling Tank Flange for Swing-out .............. 27
13. Adjuster Bolt (Closed position) .................... 27
14. Adjuster Bolt (Open position) ....................... 27
15. Sectional Assembly - Close-Coupled
Pump (Shown with Mechanical Seal) ........ 30
16. Sectional Assembly with Overhead
Drive (Shown with Packing) ....................... 31
17. Optional Swing-out Assembly ...................... 32
18. Model 855 Tank Mounting Flange ............... 33
19. Model 855 Universal Discharge Flange ....... 34
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855 – Filtrate Pump 855-15.04.EN
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
B. MACHINERY DIRECTIVE 2006/42/EC. This
product is designed to Conform with Machinery Directive
2006/42/EC, Safety of Machinery EN ISO 12100:2010,
EN ISO 13732-1:2008, EN 626-1:2008, EN ISO
13857:2008, and the EHSRs.
Complete Machinery for use in EU and EAA will have
CE mark and Declaration of Conformity. Motors for CE
marked pumps will have motors that are marked to
confirm that they comply with the Low Voltage Directive
2006/95/EC.
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 Filtrate Pump, thus upgrading the
reliability, service life, and quality of pump maintenance.
These operating instructions are intended to facilitate
familiarization with the product. 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 15 and 16 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.
CAUTION
Pumps assembled without a motor will have a
Declaration of Incorporation and will not have a
CE mark. When a motor is added, all guards
must be installed, the motor must be CE
marked and the completed machine reviewed
for compliance for applicable EHSRs before a
CE mark is attached.
NOTE
Since 29 December 2009 Directive 2006/42/EC
has regulated the placing on the market, and
the putting into service, of machinery in the
EEA, replacing Directive 98/37/EC.
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.
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855 – Filtrate Pump 855-15.04.EN
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
I. 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.
record provided at the front of this manual. This
information must be included in all correspondence
II. SAFETY.
regarding the unit. This will ensure that the correct pump
and/or parts are ordered in a timely manner.
A. SAFETY PRECAUTIONS. The manual is designed
to provide adequate instructions for the safe and
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 9, Recommended Spare Parts. Part
numbers correspond to Figures 15 and 16.
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.
G. PARTS ORDERING. When ordering replacement
parts, please specify:
B. SUMMARY OF SAFETY MARKING. The safety
instructions contained in this manual where non-
Model of pump (located on nameplate)
Serial number of pump (located on nameplate)
observance of the instruction will cause a hazard is
specially marked with the symbol:
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.
H. 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.
General hazard sign to ISO 7000 - 0434.
Notes highlight an operating or maintenance procedure,
condition, or statement which is essential, but is not of
known hazardous nature as indicated by DANGERS,
WARNINGS and CAUTIONS.
The word "CAUTION" is used to introduce safety
instructions whose non-observance may lead to damage
to the machine and its functions.
The word "WARNING" is used to introduce safety
instructions whose non-observance may lead to a
potential hazard exists, capable of producing injury to
personnel, if approved procedures are not followed.
The word “DANGER” indicates a location, equipment, or
system where imminent hazards exist, capable of
producing immediate injury or death to personnel, if
approved procedures are not followed.
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.
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C. SCOPE OF COMPLIANCE.
described in the manual for taking the unit out of service
must be adhered to.
Where Carver Pump has supplied only the bare shaft
pump, the rating applies only to the pump. The party
responsible for assembling the pump set shall select the
coupling, driver, seal and any additional equipment, with
the necessary EC 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 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.
D. 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.
E. SAFETY INSTRUCTIONS FOR THE OPERATOR
/USER.
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.
G. 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.
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.
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.
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.)
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.
F. 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.
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
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
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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.
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.
III. EQUIPMENT DESCRIPTION.
A. PUMP HISTORY.
The Filtrate Pump line was designed in the late 1950’s
at the request of a large Original Equipment
Manufacturer (OEM) of vacuum filtration equipment.
The company had found that the typical centrifugal
pump would not operate against the high vacuum in a
filtrate receiver tank without the inclusion of a
hydrostatic leg in order to provide enough Net Positive
Suction Head Available (NPSHA) to prevent the pump
from cavitating and destroying itself.
The receiver tank flange-mounted Filtrate Pump was
designed to solve the OEM's problem and they have
been used in pumping liquids under vacuum or with very
low suction pressures ever since.
B. PUMP FEATURES.
Hazard to the environment due to leakage of
hazardous substances.
Avoid Possible Non-Compliance. The following
specific safety precautions apply to the pumping unit:
Do NOT exceed maximum discharge pressure
on discharge case (100 psig/ 690 kpa).
Do NOT operate pump without fluid to seal or
packing.
Do NOT run pump dry for extended periods of
time (longer than 1/2 hour)
Do NOT run pump against a closed discharge
valve.
Do NOT exceed the Maximum rated speed
(2400 rpm).
A check valve should be installed in the
discharge line.
Pumps assembled by Carver without a motor
will have a Declaration of Incorporation and will
not have a CE mark. When a motor is added, all
guards must be installed, the motor must be CE
marked and the completed machine reviewed
for compliance for applicable EHSRs before a
CE mark is attached.
The Filtrate Pumps do not require a hydrostatic leg, will
operate against vacuums up to 660 mm Hg (26” Hg) on
the suction side and if, on occasion, it pumps the
receiver tank dry, or the inflow of process liquid into the
tank is interrupted, it will continue to run, will maintain
the vacuum in the system, and when the suction again
becomes flooded it will prime itself and resume pumping
the process liquid. An important aspect of the pump’s
operation is that it accomplishes all of the foregoing
without the use of mechanical or electrical level
controls on the receiver tank, thereby simplifying and
enhancing the reliability of the entire system.
C. PUMP DETAILS.
4
Figure 1. Model 855-OH Pump
The line has two variations. The standard is the flange
mounted Model 855-OH which features an overhead vbelt drive arrangement for varying the pump speed and
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855 – Filtrate Pump 855-15.04.EN
thereby the head/flow conditions delivered by the pump.
This pump is also built in a close coupled (direct drive)
configuration, the Model 855-CC, for use when the vdrive feature is not required.
The bearing frame (19) is connected to the motor plate
with threaded rods (632) and jam nuts (616). The motor
is bolted to the motor plate with bolts (604) and hex nuts
(618).
Each of the models is built in six sizes: 1”, 1 ½”, 2”, 2
½”, 3” and 4” discharges. The complete pumps are built
with a CE stamp indicating compliance with European
Common Market specifications.
Standard materials of construction are cast iron and
CD4MCu. Other metallurgies are available, such as
hard iron, monel, hastelloy, etc... Also available is a fully
rubber lined version for abrasive and extremely
corrosive application including the Flue Gas Desulfurization (FGD) process with high chlorides.
The bare pump consists of following major parts and
options. Please refer to Figures 15, 16 and 17,
assembly drawings, for the location of parts identified by
item numbers.
Item 1 - Casing. The casing houses the impeller (3)
and consists of the discharge volute, and a tangent
discharge nozzle, discharge flange, back cover, stuffing
box and mounting bracket. The casing is fastened to the
bearing frame (19) or motor (200) with capscrews (601).
The casing bolts to the suction cover (10) and to the
discharge piping with special flanges as shown in Figure
19.
Item 3 - Impeller. The filtrate pumps are equipped with
semi-open impellers. The impeller is keyed to the shaft
(6) by the impeller key (32) and is locked in place by the
impeller bolt (26) and impeller washer (28).
Item 6 - Shaft. The shaft of the 855-OH pump is
designed to provide stabilization to the rotor system
when pump operates away from the best efficiency
point. Drive belt(s) connect the pump shaft to the driver
shaft.
Item 16 and 18 – Ball Bearings. Deep groove Conrad
type, C-3 internal fit ball bearings (8"pumps) or doublerow angular contact C-3 internal fit ball bearings
(9"pumps) are housed in the bearing frame (19). The
ball bearings are sealed and lubricated for life.
Item 19 - Bearing Frame. The principal function of the
bearing frame is to carry the loads from the liquid end of
the pump to the base and to transport power from the
motor (200) to the impeller (3). The bearing frame has
an outboard ball bearing (16) and an inboard ball
bearing (18). This bearing frame is designed to be belt
driven by an overhead (OH) mounted motor
Item 23 - Motor Plate. An adjustable motor plate is
designed to provide adequate support for the pump and
motor (200) so the pump can be operated without
excessive deflection, excessive vibration, or resonance.
Item 53 – Optional Swing-out. Pumps may be
equipped with an optional swing-out to facilitate
servicing the pump and to aid in inspecting for debris.
Figure 2. Optional Swing-out
Item 90 – Mechanical Seal. A mechanical seal may be
supplied in place of a packed stuffing box when
specified by the customer. Many variations of types and
materials are available.
Item 180 - Packing. Pumps equipped with packing
have a lantern ring (29) which is located inside the flush
water connection on the stuffing box.
Item 276 – Belt Drive. The Model 855-OH is supplied
with belts (276) and sheaves (277). The belts and
shaeves should be sized to obtain the desired pump
shaft speed for the given motor.
IV. EFFECTS OF FLUIDS.
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,
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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.
NOTE
Pump speeds for close coupled (Model 855)
units are generally limited to 1750 RPM. Pump
speeds for belt driven (Model 855-OH) units are
limited to 2400 RPM.
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. See
Figures 18 and 19 for mating flange information and
weights.
Sound Characteristics. Table 1 shows the estimated
Sound Pressure levels for the Filtrate Pump. These
values are typical, actual values will vary with motor
used, pump size, condition of service, belt adjustment,
bearing condition, etc. Actual values for specific units
must be determined by testing.
Stuffing Box. The stuffing box, Figure 3, is where the
packing or mechanical seal is located.
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.
Materials of Construction. The listed material
specifications in Table 2 are referenced for standard
catalog options.
Mechanical Data. The Key Mechanical data in Table 3
lists the maximum allowable horsepower at the
maximum allowable pump shaft speed (2400 rpm).
Dimensions and diameters are reference and given in
inches.
6
I-855
Rated Power Input
PN (kw)
Estimated Sound Pressure Level L pA (dB)*
Pump with Motor
Pump Only
1750
1450
1750
1450
1.5
61.5
58.5
52
52
2.2
63.5
60.5
53
53
3.0
65.5
62.5
55
55
4.0
67
64
57
57
5.5
68.5
65.5
57.5
57.5
7.5
70
67
58.5
58.5
11.0
72
69
60.5
60.5
15.0
73
70
61.5
61.5
18.5
73.5
70.5
62.5
62.5
22.0
74
71
63.5
63.5
* Measured at a distance of 1 m from the pump outline. Room and foundation influences have not been included.
The tolerance for these factors is 1 to 2 dB.
855 – Filtrate Pump 855-15.04.EN
Table 1. Estimated Noise Characteristics
Figure 3. Stuffing Box Dimensions
7
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