Goulds Pumps 3420 User manual

Installation, Operation, and
Maintenance Manual
Model 3420

Table of Contents
1 Introduction and Safety ....................................................................................................................................4
1.1 Introduction................................................................................................................................................ 4
1.1.1 Requesting other information ..........................................................................................................4
1.2 Safety ........................................................................................................................................................4
1.2.1 Safety terminology and symbols ..................................................................................................... 5
1.2.2 Environmental safety.......................................................................................................................6
1.2.3 User safety ......................................................................................................................................6
1.2.4 Ex-approved products .....................................................................................................................8
1.3 Product approval standards ...................................................................................................................... 9
1.4 Product warranty .......................................................................................................................................9
1.5 ATEX Considerations and Intended Use................................................................................................10
2 Transportation and Storage............................................................................................................................ 12
2.1 Inspect the delivery ................................................................................................................................. 12
2.1.1 Inspect the package ......................................................................................................................12
2.1.2 Inspect the unit..............................................................................................................................12
2.2 Transportation guidelines ........................................................................................................................ 12
2.2.1 Pump handling .............................................................................................................................. 12
2.2.2 Lifting methods..............................................................................................................................12
2.3 Storage guidelines................................................................................................................................... 14
2.3.1 Pump storage requirements..........................................................................................................14
2.3.2 Frostproofing .................................................................................................................................14
3 Product Description ........................................................................................................................................15
3.1 General Description................................................................................................................................. 15
3.1.1 Pump group definitions .................................................................................................................16
3.2 Nameplate information ............................................................................................................................17
4 Installation........................................................................................................................................................20
4.1 Pre-installation......................................................................................................................................... 20
4.1.1 Pump location guidelines .............................................................................................................. 20
4.1.2 Foundation requirements .............................................................................................................. 21
4.2 Baseplate-mounting procedures ............................................................................................................. 22
4.2.1 Prepare the baseplate for mounting..............................................................................................22
4.2.2 Prepare the foundation for mounting............................................................................................. 23
4.2.3 Install and level the baseplate.......................................................................................................23
4.3 Install the pump, driver, and coupling......................................................................................................24
4.4 Pump-to-driver alignment ........................................................................................................................ 24
4.4.1 Alignment checks ..........................................................................................................................24
4.4.2 Permitted indicator values for alignment checks........................................................................... 25
4.4.3 Alignment measurement guidelines ..............................................................................................25
4.4.4 Attach the dial indicators for alignment ......................................................................................... 26
4.4.5 Perform angular alignment for a vertical correction ......................................................................26
4.4.6 Perform angular alignment for a horizontal correction .................................................................. 27
4.4.7 Perform parallel alignment for a vertical correction....................................................................... 27
4.4.8 Perform parallel alignment for a horizontal correction...................................................................28
4.4.9 Perform complete alignment for a vertical correction.................................................................... 28
4.4.10 Perform complete alignment for a horizontal correction..............................................................29
Table of Contents
Model 3420 Installation, Operation, and Maintenance Manual 1

4.5 Grout the baseplate.................................................................................................................................29
4.6 Piping checklists......................................................................................................................................30
4.6.1 General piping checklist ................................................................................................................30
4.6.2 Suction-piping checklist.................................................................................................................32
4.6.3 Final piping checklist .....................................................................................................................33
5 Commissioning, Startup, Operation, and Shutdown ...................................................................................34
5.1 Preparation for startup............................................................................................................................. 34
5.1.1 Check the rotation .........................................................................................................................35
5.1.2 Couple the pump and driver..........................................................................................................36
5.1.3 Install the coupling guard .............................................................................................................. 36
5.2 Bearing lubrication................................................................................................................................... 40
5.2.1 Lubricating-oil requirements..........................................................................................................41
5.2.2 Acceptable oil for lubricating bearings ..........................................................................................41
5.2.3 Lubricating the bearings................................................................................................................41
5.3 Shaft-sealing options...............................................................................................................................43
5.3.1 Connection of sealing liquid for mechanical seals ........................................................................43
5.3.2 Packed stuffing box option ............................................................................................................44
5.3.3 Connection of sealing liquid for a packed stuffing box ..................................................................44
5.3.4 Seal the shaft with a packed stuffing box......................................................................................44
5.4 Pump priming ..........................................................................................................................................45
5.4.1 Prime with the suction supply above the pump.............................................................................46
5.4.2 Prime with the suction supply below the pump ............................................................................. 46
5.4.3 Prime with an ejector.....................................................................................................................47
5.5 Start the pump.........................................................................................................................................48
5.6 Pump operation precautions ................................................................................................................... 49
5.7 Shut down the pump ............................................................................................................................... 50
5.8 Make the final alignment of the pump and driver .................................................................................... 50
6 Maintenance.....................................................................................................................................................52
6.1 Maintenance schedule ............................................................................................................................ 52
6.2 Bearing maintenance .............................................................................................................................. 53
6.2.1 Bearing and oil requirements ........................................................................................................ 53
6.2.2 Acceptable oil for lubricating bearings ..........................................................................................54
6.2.3 Lubricate the bearings...................................................................................................................54
6.2.4 Lubricating-grease requirements ..................................................................................................54
6.2.5 Regrease the grease-lubricated bearings .....................................................................................55
6.2.6 Remove the ball bearings .............................................................................................................55
6.2.7 Remove the roller bearings ...........................................................................................................56
6.3 Mechanical-seal maintenance................................................................................................................. 56
6.4 Packed stuffing-box maintenance ...........................................................................................................57
6.5 Disassembly ............................................................................................................................................ 58
6.5.1 Disassembly precautions .............................................................................................................. 58
6.5.2 Drain the pump..............................................................................................................................58
6.5.3 Remove the coupling guard .......................................................................................................... 59
6.5.4 Remove the casing .......................................................................................................................60
6.5.5 Bearing housing and bearings removal.........................................................................................62
6.5.6 Disassemble the rotating element.................................................................................................68
6.6 Pre-assembly inspections ....................................................................................................................... 69
6.6.1 Replacement guidelines................................................................................................................69
Table of Contents
2 Model 3420 Installation, Operation, and Maintenance Manual

6.6.2 Bearings inspection.......................................................................................................................70
6.6.3 Shaft inspection.............................................................................................................................70
6.6.4 Shaft replacement guidelines........................................................................................................71
6.6.5 Parting gasket inspection and replacement .................................................................................. 71
6.6.6 Replace the impeller wear rings....................................................................................................72
6.7 Reassembly............................................................................................................................................. 73
6.7.1 Install the impeller ......................................................................................................................... 73
6.7.2 Bearing housing and bearings installation ....................................................................................74
6.7.3 Install the rotating element ............................................................................................................77
6.7.4 Assembly references.....................................................................................................................79
7 Troubleshooting ............................................................................................................................................ 105
7.1 Alignment troubleshooting..................................................................................................................... 105
7.2 Operation troubleshooting ..................................................................................................................... 105
8 Parts Listings and Cross-Sectionals...........................................................................................................107
8.1 SX and MX group parts list.................................................................................................................... 107
8.2 M, M-modified, and 20x24-28 group parts list ....................................................................................... 108
8.3 Standard group parts list (18x20-24)..................................................................................................... 110
8.4 L group parts list.................................................................................................................................... 112
8.5 LDS group parts list............................................................................................................................... 114
8.6 XL and XXL group parts list................................................................................................................... 116
8.7 Construction details............................................................................................................................... 118
8.8 Impeller description ...............................................................................................................................121
8.9 Cross-sectional drawings ......................................................................................................................124
9 Other Relevant Documentation or Manuals................................................................................................130
9.1 For additional documentation ................................................................................................................ 130
Table of Contents
Model 3420 Installation, Operation, and Maintenance Manual 3

1 Introduction and Safety
1.1 Introduction
Purpose of this manual
The purpose of this manual is to provide necessary information for:
•Installation
• Operation
• Maintenance
CAUTION:
Failure to observe the instructions contained in this manual could result in personal injury
and/or property damage, and may void the warranty. Read this manual carefully before instal-
ling and using the product.
NOTICE:
Save this manual for future reference and keep it readily available.
1.1.1 Requesting other information
Special versions can be supplied with supplementary instruction leaflets. See the sales contract for any
modifications or special version characteristics. For instructions, situations, or events that are not consid-
ered in this manual or in the sales documents, please contact the nearest ITT representative.
Always specify the exact product type and identification code when requesting technical information or
spare parts.
1.2 Safety
WARNING:
•Risk of serious personal injury. Applying heat to impellers, propellers, or their retaining
devices can cause trapped liquid to rapidly expand and result in a violent explosion. This
manual clearly identifies accepted methods for disassembling units. These methods must
be adhered to. Never apply heat to aid in their removal unless explicitly stated in this
manual.
• The operator must be aware of the pumpage and take appropriate safety precautions to
prevent physical injury.
• Risk of serious injury or death. If any pressure-containing device is over-pressurized, it
can explode, rupture, or discharge its contents. It is critical to take all necessary meas-
ures to avoid over-pressurization.
• Risk of death, serious personal injury, and property damage. Installing, operating, or
maintaining the unit using any method not prescribed in this manual is prohibited. Prohib-
ited methods include any modification to the equipment or use of parts not provided by
ITT. If there is any uncertainty regarding the appropriate use of the equipment, please
contact an ITT representative before proceeding.
1 Introduction and Safety
4 Model 3420 Installation, Operation, and Maintenance Manual

• If the pump or motor is damaged or leaking, electric shock, fire, explosion, liberation of
toxic fumes, physical harm, or environmental damage may result. Do not operate the unit
until the problem has been corrected or repaired.
• Risk of serious personal injury or property damage. Dry running may cause rotating parts
within the pump to seize to non-moving parts. Do not run dry.
• Risk of death, serious personal injury, and property damage. Heat and pressure buildup
can cause explosion, rupture, and discharge of pumpage. Never operate the pump with
suction and/or discharge valves closed.
• Running a pump without safety devices exposes operators to risk of serious personal in-
jury or death. Never operate a unit unless appropriate safety devices (guards, etc.) are
properly installed. See specific information about safety devices in other sections of this
manual.
CAUTION:
•Risk of injury and/or property damage. Operating a pump in an inappropriate application
can cause over pressurization, overheating, and/or unstable operation. Do not change the
service application without the approval of an authorized ITT representative.
1.2.1 Safety terminology and symbols
About safety messages
It is extremely important that you read, understand, and follow the safety messages and regulations
carefully before handling the product. They are published to help prevent these hazards:
•Personal accidents and health problems
• Damage to the product
• Product malfunction
Hazard levels
Hazard level Indication
DANGER:
A hazardous situation which, if not avoided, will result in death or seri-
ous injury
WARNING:
A hazardous situation which, if not avoided, could result in death or
serious injury
CAUTION:
A hazardous situation which, if not avoided, could result in minor or
moderate injury
NOTICE:
• A potential situation which, if not avoided, could result in unde-
sirable conditions
•A practice not related to personal injury
Hazard categories
Hazard categories can either fall under hazard levels or let specific symbols replace the ordinary hazard
level symbols.
Electrical hazards are indicated by the following specific symbol:
1.2 Safety
Model 3420 Installation, Operation, and Maintenance Manual 5

ELECTRICAL HAZARD:
These are examples of other categories that can occur. They fall under the ordinary hazard levels and
may use complementing symbols:
•Crush hazard
• Cutting hazard
• Arc flash hazard
1.2.1.1 The Ex symbol
The Ex symbol indicates safety regulations for Ex-approved products when used in atmospheres that are
potentially explosive or flammable.
1.2.2 Environmental safety
The work area
Always keep the station clean to avoid and/or discover emissions.
Waste and emissions regulations
Observe these safety regulations regarding waste and emissions:
• Appropriately dispose of all waste.
• Handle and dispose of the processed liquid in compliance with applicable environmental regula-
tions.
• Clean up all spills in accordance with safety and environmental procedures.
• Report all environmental emissions to the appropriate authorities.
WARNING:
If the product has been contaminated in any way, such as from toxic chemicals or nuclear radi-
ation, do NOT send the product to ITT until it has been properly decontaminated and advise
ITT of these conditions before returning.
Electrical installation
For electrical installation recycling requirements, consult your local electric utility.
1.2.2.1 Recycling guidelines
Always follow local laws and regulations regarding recycling.
1.2.3 User safety
General safety rules
These safety rules apply:
1.2 Safety
6 Model 3420 Installation, Operation, and Maintenance Manual

• Always keep the work area clean.
• Pay attention to the risks presented by gas and vapors in the work area.
• Avoid all electrical dangers. Pay attention to the risks of electric shock or arc flash hazards.
• Always bear in mind the risk of drowning, electrical accidents, and burn injuries.
Safety equipment
Use safety equipment according to the company regulations. Use this safety equipment within the work
area:
• Helmet
• Safety goggles, preferably with side shields
• Protective shoes
• Protective gloves
• Gas mask
• Hearing protection
• First-aid kit
• Safety devices
Electrical connections
Electrical connections must be made by certified electricians in compliance with all international, nation-
al, state, and local regulations. For more information about requirements, see sections dealing specifical-
ly with electrical connections.
1.2.3.1 Precautions before work
Observe these safety precautions before you work with the product or are in connection with the product:
• Provide a suitable barrier around the work area, for example, a guard rail.
• Make sure that all safety guards are in place and secure.
• Make sure that you have a clear path of retreat.
• Make sure that the product cannot roll or fall over and injure people or damage property.
• Make sure that the lifting equipment is in good condition.
• Use a lifting harness, a safety line, and a breathing device as required.
• Allow all system and pump components to cool before you handle them.
• Make sure that the product has been thoroughly cleaned.
• Disconnect and lock out power before you service the pump.
• Check the explosion risk before you weld or use electric hand tools.
1.2.3.2 Precautions during work
Observe these safety precautions when you work with the product or are in connection with the product:
CAUTION:
Failure to observe the instructions contained in this manual could result in personal injury
and/or property damage, and may void the warranty. Read this manual carefully before instal-
ling and using the product.
• Never work alone.
•Always wear protective clothing and hand protection.
• Stay clear of suspended loads.
1.2 Safety
Model 3420 Installation, Operation, and Maintenance Manual 7

• Always lift the product by its lifting device.
• Beware of the risk of a sudden start if the product is used with an automatic level control.
• Beware of the starting jerk, which can be powerful.
• Rinse the components in water after you disassemble the pump.
• Do not exceed the maximum working pressure of the pump.
• Do not open any vent or drain valve or remove any plugs while the system is pressurized. Make
sure that the pump is isolated from the system and that pressure is relieved before you disassem-
ble the pump, remove plugs, or disconnect piping.
• Never operate a pump without a properly installed coupling guard.
1.2.3.3 Hazardous liquids
The product is designed for use in liquids that can be hazardous to your health. Observe these rules
when you work with the product:
• Make sure that all personnel who work with biologically hazardous liquids are vaccinated against
diseases to which they may be exposed.
• Observe strict personal cleanliness.
• A small amount of liquid will be present in certain areas like the seal chamber.
1.2.3.4 Wash the skin and eyes
1. Follow these procedures for chemicals or hazardous fluids that have come into contact with your
eyes or your skin:
Condition Action
Chemicals or hazardous fluids
in eyes
1. Hold your eyelids apart forcibly with your fingers.
2. Rinse the eyes with eyewash or running water for at least 15 minutes.
3. Seek medical attention.
Chemicals or hazardous fluids
on skin
1. Remove contaminated clothing.
2. Wash the skin with soap and water for at least 1 minute.
3. Seek medical attention, if necessary.
1.2.4 Ex-approved products
Follow these special handling instructions if you have an Ex-approved unit.
The coupling guard used in an ATEX classified environment must be properly certified and
must be constructed from a spark resistant material.
Personnel requirements
These are the personnel requirements for Ex-approved products in potentially explosive atmospheres:
•All work on the product must be carried out by certified electricians and ITT-authorized mechanics.
Special rules apply to installations in explosive atmospheres.
• All users must know about the risks of electric current and the chemical and physical characteristics
of the gas, the vapor, or both present in hazardous areas.
1.2 Safety
8 Model 3420 Installation, Operation, and Maintenance Manual

• Any maintenance for Ex-approved products must conform to international and national standards
(for example, IEC/EN 60079-17).
ITT disclaims all responsibility for work done by untrained and unauthorized personnel.
Product and product handling requirements
These are the product and product handling requirements for Ex-approved products in potentially explo-
sive atmospheres:
• Only use the product in accordance with the approved motor data.
• The Ex-approved product must never run dry during normal operation. Dry running during service
and inspection is only permitted outside the classified area.
• Before you start work on the product, make sure that the product and the control panel are isolated
from the power supply and the control circuit, so they cannot be energized.
• Do not open the product while it is energized or in an explosive gas atmosphere.
• Make sure that thermal contacts are connected to a protection circuit according to the approval
classification of the product, and that they are in use.
• Intrinsically safe circuits are normally required for the automatic level-control system by the level
regulator if mounted in zone 0.
• The yield stress of fasteners must be in accordance with the approval drawing and the product
specification.
• Do not modify the equipment without approval from an authorized ITT representative.
• Only use parts that are provided by an authorized ITT representative.
1.3 Product approval standards
Regular standards
WARNING:
Use of equipment unsuitable for the environment can pose risks of ignition and/or explosion.
Ensure the pump driver and all other auxiliary components meet the required area classifica-
tion at the site. If they are not compatible, do not operate the equipment and contact an ITT
representative before proceeding.
All standard products are approved according to CSA standards in Canada and UL standards in USA.
The drive unit degree of protection follows IP68. See the nameplate for maximum submersion, according
to standard IEC 60529.
1.4 Product warranty
Coverage
ITT undertakes to remedy faults in products from ITT under these conditions:
•The faults are due to defects in design, materials, or workmanship.
• The faults are reported to an ITT representative within the warranty period.
• The product is used only under the conditions described in this manual.
• The monitoring equipment incorporated in the product is correctly connected and in use.
• All service and repair work is done by ITT-authorized personnel.
• Genuine ITT parts are used.
1.3 Product approval standards
Model 3420 Installation, Operation, and Maintenance Manual 9

• Only Ex-approved spare parts and accessories authorized by ITT are used in Ex-approved prod-
ucts.
Limitations
The warranty does not cover faults caused by these situations:
•Deficient maintenance
• Improper installation
• Modifications or changes to the product and installation made without consulting ITT
• Incorrectly executed repair work
• Normal wear and tear
ITT assumes no liability for these situations:
• Bodily injuries
• Material damages
• Economic losses
Warranty claim
ITT products are high-quality products with expected reliable operation and long life. However, should
the need arise for a warranty claim, then contact your ITT representative.
1.5 ATEX Considerations and Intended Use
Special care must be taken in potentially explosive environments to ensure that the equipment is proper-
ly maintained. This includes but is not limited to:
1. Monitoring the pump frame and liquid end temperature.
2. Maintaining proper bearing lubrication.
3. Ensuring that the pump is operated in the intended hydraulic range.
The ATEX conformance is only applicable when the pump unit is operated within its intended use. Oper-
ating, installing or maintaining the pump unit in any way that is not covered in the Instruction, Operation,
and Maintenance manual (IOM) can cause serious personal injury or damage to the equipment. This in-
cludes any modification to the equipment or use of parts not provided by ITT Goulds Pumps. If there is
any question regarding the intended use of the equipment, please contact an ITT Goulds representative
before proceeding.
Current IOMs are available at www.gouldspumps.com/en-US/Tools-and-Resources/Literature/IOMs/ or
from your local ITT Goulds Pumps Sales representative.
All pumping unit (pump, seal, coupling, motor and pump accessories) certified for use in an ATEX classi-
fied environment, are identified by an ATEX tag secured to the pump or the baseplate on which it is
mounted. A typical tag would look like this:
1.5 ATEX Considerations and Intended Use
10 Model 3420 Installation, Operation, and Maintenance Manual

Figure 1: Typical ATEX pump nameplate
Table 1: Temperature class definitions
Code Maximum permissible surface tem-
perature in °C | °F
Maximum permissible liquid tempera-
ture in °C | °F
T1 440 | 824 372 | 700
T2 290 | 554 267 | 513
T3 195 | 383 172 | 342
T4 130 | 266 107 | 225
T5 Option not available Option not available
T6 Option not available Option not available
* Maximum liquid temperature may be limited by the pump model and order specific options. Table 1:
Temperature class definitions on page 11 is for the purpose of determining T'x' code for ATEX applica-
tions with liquid temperatures exceeding 107ºC | 225ºF.
For variable speed motor applications – Electric motor must be specified with shaft grounding and flexi-
ble coupling should be conductive steel disc type.
The code classification marked on the equipment must be in accordance with the specified area where
the equipment will be installed. If it is not, do not operate the equipment and contact your ITT Goulds
Pumps sales representative before proceeding.
1.5 ATEX Considerations and Intended Use
Model 3420 Installation, Operation, and Maintenance Manual 11

2 Transportation and Storage
2.1 Inspect the delivery
2.1.1 Inspect the package
1. Inspect the package for damaged or missing items upon delivery.
2. Note any damaged or missing items on the receipt and freight bill.
3. File a claim with the shipping company if anything is out of order.
If the product has been picked up at a distributor, make a claim directly to the distributor.
2.1.2 Inspect the unit
1. Remove packing materials from the product.
Dispose of all packing materials in accordance with local regulations.
2. Inspect the product to determine if any parts have been damaged or are missing.
3. If applicable, unfasten the product by removing any screws, bolts, or straps.
For your personal safety, be careful when you handle nails and straps.
4. Contact your sales representative if anything is out of order.
2.2 Transportation guidelines
2.2.1 Pump handling
WARNING:
Dropping, rolling or tipping units, or applying other shock loads, can cause property damage
and/or personal injury. Ensure that the unit is properly supported and secure during lifting and
handling.
CAUTION:
Risk of injury or equipment damage from use of inadequate lifting devices. Ensure lifting devi-
ces (such as chains, straps, forklifts, cranes, etc.) are rated to sufficient capacity.
2.2.2 Lifting methods
WARNING:
•Risk of serious personal injury or equipment damage. Proper lifting practices are critical
to safe transport of heavy equipment. Ensure that practices used are in compliance with
all applicable regulations and standards.
• Safe lifting points are specifically identified in this manual. It is critical to lift the equipment
only at these points. Integral lifting eyes or eye bolts on pump and motor components are
intended for use in lifting the individual components only.
• Lifting and handling heavy equipment poses a crush hazard. Use caution during lifting
and handling and wear appropriate Personal Protective Equipment (PPE, such as steel-
toed shoes, gloves, etc.) at all times. Seek assistance if necessary.
• Do not attach sling ropes to shaft ends.
2 Transportation and Storage
12 Model 3420 Installation, Operation, and Maintenance Manual

The unit must be unloaded and handled by lifting equally at four or more points on the baseplate. The
lugs on the upper half casing are designed for lifting the upper half of the casing only.
Pump mounting Lifting method
Bare pump Hitch a nylon sling, chain, or wire rope around both bearing housings.
Pump and base Support the pump with a sling under the two bearing housings and a sling un-
der the motor end of the baseplate.
Pump, base, and motor Attach slings to the baseplate lifting lugs. Use a spreader bar so that the pump
is not damaged.
● Bare pump
Figure 2: The proper lifting method for a bare pump
●Pump and base
130° max
1. Nylon sling, chain, or wire rope
Figure 3: The proper lifting method for a vertical pump mounted on a half pedestal
1
30° max
1. Nylon sling, chain, or wire rope
Figure 4: The proper lifting method for a vertical pump mounted on a full pedestal
2.2 Transportation guidelines
Model 3420 Installation, Operation, and Maintenance Manual 13

● Pump, base, and motor
Figure 5: The proper lifting method for pump, base, and motor
2.3 Storage guidelines
2.3.1 Pump storage requirements
Storage requirements depend on the amount of time that you store the unit. The normal packaging is
designed only to protect the unit during shipping.
Length of time in storage Storage requirements
Upon receipt/short-term (less than six
months)
• Store in a covered and dry location.
•Store the unit free from dirt and vibrations.
Long-term (more than six months) • Store in a covered and dry location.
•Store the unit free from heat, dirt, and vibrations.
• Rotate the shaft by hand several times at least every three months.
Treat bearing and machined surfaces so that they are well preserved. Refer to drive unit and coupling
manufacturers for their long-term storage procedures.
You can purchase long-term storage treatment with the initial unit order or you can purchase it and apply
it after the units are already in the field. Contact your local ITT sales representative.
2.3.2 Frostproofing
Table 2: Situations when the pump is or is not frostproof
Situation Condition
Operating The pump is frostproof.
Immersed in a liquid The pump is frostproof.
Lifted out of a liquid into a temperature below freezing The impeller might freeze.
2.3 Storage guidelines
14 Model 3420 Installation, Operation, and Maintenance Manual

3 Product Description
3.1 General Description
Product description
Model 3420 is a horizontal, centrifugal pump with these characteristics:
•Single stage
• Double suction
• Enclosed impeller
Model 3420 uses English dimensions.
Casing
• The casing is horizontally split. The upper and lower halves are held together with studs and nuts or
capscrews.
• The upper half has a vent connection, a priming connection, and one or two stuffing-box seal
ring connections.
• The lower half has two drain connections, suction and discharge gauge connections, and
stuffing-box overflow connections.
• Flanged suction and discharge connections are located in the lower half of the casing and conform
to ANSI 16.1/16.5 class 125/150.
• The casing is supported by integrally cast feet.
• Separate bearing housings are attached directly to machined fits in each end of the casing with
capscrews or machined fits that are secured with bearing caps, studs, and nuts.
• All sizes have:
• Dual volute casings in order to reduce radial loads on the shaft
• Two jacking screws
• Two lifting lugs for the upper half
• Two tapered dowel pins for alignment
• Non-asbestos parting gasket, 0.030 or 0.016 in. (0.75 or 0.41 mm)
Impeller
• Enclosed, double-suction design for axial hydraulic balance
• Fully machined exterior surfaces
• Receives a one- or two-plane spin balance
• Keyed to the shaft and held in place with shaft sleeves and sleeve nuts
Wear rings
• Casing and impeller wear rings maintain proper running clearances and minimize leaks between
the suction and discharge chambers in the casing.
• Casing rings are held in place with a machined hook lock.
• Impeller rings are held in place with axial setscrews.
Shaft
• Maximum shaft deflection of 0.002 in. (0.051 mm) at the stuffing-box face under the worst operating
conditions
3 Product Description
Model 3420 Installation, Operation, and Maintenance Manual 15

• Completely dry with O-ring seals between the impeller and shaft sleeves, and between the shaft
sleeves and the sleeve nuts
• Made from AISI 4340 steel with an option for 316 stainless steel
Shaft sleeves
• Standard on all pumps
• Keyed to the shaft at the impeller
• Held in place with sleeve nuts, which tighten against rotation and are secured in place with set-
screws
Stuffing box
• Non-asbestos packing
• Contains a PTFE™ split lantern ring and renewable stuffing box throat bushings
• Tapped openings for water sealing from either the pump casing or an outside source
• Bypass piping, optional
• Two-piece machined split glands
3.1.1 Pump group definitions
These pumps are configured in several different groups that are based on bearing configurations and hydraulic
sizes:
Group Type of bearings Type of lube Bearing attach-
ment
Type of seals Hydraulic sizes
SX Ball radial and du-
plex ball thrust
bearings
Flood oil lube with
constant level oil-
er, optional grease
lube
Bearing housings
bolted to the cas-
ing
Non-metallic laby-
rinth seals
12x14-15
16x18-17H
MX Ball radial and du-
plex ball thrust
bearings
Flood oil lube with
constant level oil-
er, optional grease
lube
Bearing housings
bolted to the cas-
ing
Non-metallic laby-
rinth seals
18x20-20
M Ball radial and du-
plex ball thrust
bearings
Ring oil lube with
constant level oil-
er, optional grease
lube
Bearing housing
secured with
tongue and
groove fits and a
bearing cap with
studs and nuts
Metallic labyrinth
seals
16x18-30
18x20-30
20x24-24
20x24-30
M (modified) (Same as M group except the shaft is longer in order to accommodate a wid-
er pump.)
20x24-28
— Ball radial and du-
plex ball thrust
bearings
Ring oil lube with
constant level oil-
er, optional grease
lube
Bearing housing
secured with
tongue and
groove fits and a
bearing cap with
studs and nuts
Metallic labyrinth
seals
18x20-24
L Double row roller
bearings, both
thrust and radial
Ring oil lube with
constant level oil-
er, optional grease
lube
Bearing housing
secured with
tongue and
groove fits and a
bearing cap with
studs and nuts
Metallic labyrinth
seals
24x30-32
3.1 General Description
16 Model 3420 Installation, Operation, and Maintenance Manual

Group Type of bearings Type of lube Bearing attach-
ment
Type of seals Hydraulic sizes
LDS Double row roller
bearings, both
thrust and radial
Ring oil lube with
constant level oil-
er, optional grease
lube
Bearing housing
secured with
tongue and
groove fits and a
bearing cap with
studs and nuts
Metallic labyrinth
seals
30x30-31
30x30-38
XL Double row roller
bearings, both
thrust and radial
Ring oil lube with
constant level oil-
er, optional grease
lube
Bearing housing
secured with
tongue and
groove fits and a
bearing cap with
studs and nuts
Metallic labyrinth
seals
30x36-42
20x30-42
XXL Double row roller
bearings, both
thrust and radial
Ring oil lube with
constant level oil-
er, optional grease
lube
Bearing housing
secured with
tongue and
groove fits and a
bearing cap with
studs and nuts
Metallic labyrinth
seals
36x42-52
3.2 Nameplate information
Important information for ordering
Every pump has nameplates that provide information about the pump. The nameplates are located on
the casing and the bearing frame.
When you order spare parts, identify this pump information:
• Model
• Size
• Serial number
• Item numbers of the required parts
Refer to the nameplate on the pump casing for most of the information. See Parts List for item numbers.
Nameplate types
Nameplate Description
Pump casing Provides information about the hydraulic characteristics of the pump.
The formula for the pump size is: Discharge x Suction - Nominal Maximum Impeller Diameter in
inches.
(Example: 2x3-8)
Bearing frame Provides information about the lubrication system used.
ATEX If applicable, your pump unit might have an ATEX nameplate affixed to the pump, the base-
plate, or the discharge head. The nameplate provides information about the ATEX specifica-
tions of this pump.
IECEx If applicable, your pump unit might have the following IECEx nameplate affixed to the pump
and/or baseplate. The nameplate provides information about the IECEx specifications of this
pump.
3.2 Nameplate information
Model 3420 Installation, Operation, and Maintenance Manual 17

Nameplate on the pump casing using English units
Nameplate field Explanation
STD. NO. ANSI standard designation
MAT'L. CONST. Material of which the pump is constructed
IMPLR. DIA. Impeller diameter, in inches
MAX. DIA. Maximum impeller diameter, in inches
MODEL Pump model
SIZE Size of the pump
GPM Rated pump flow, in gallons per minute
FT. HD. Rated pump head, in feet
RPM Rated pump speed, revolutions per minute
SER. NO. Serial number of the pump
MAX. DSGN. PSI @ 100F Maximum pressure at 100ºF according to the pump design
Nameplate on the pump casing using metric units
Nameplate field Explanation
STD. NO. ANSI standard designation
MAT'L. CONST. Material of which the pump is constructed
IMPLR. DIA. Impeller diameter
MAX. DIA. Maximum impeller diameter
MODEL Pump model
SIZE Size of the pump
M3/HR Rated pump flow, in cubic meters per hour
M HD. Rated pump head, in meters
RPM Rated pump speed, revolutions per minute
SER. NO. Serial number of the pump
MAX. DSGN KG/CM2 @ 20°C Maximum pressure at 20ºC according to the pump design
3.2 Nameplate information
18 Model 3420 Installation, Operation, and Maintenance Manual