Pentair Aurora 382 SC Series Manual

1"
"
Part # A-03-369 | © 2015 Pentair Ltd. | 07/06/15

2"
"
IMPORTANT NOTE TO INSTALLER:
This manual contains important information about the
installation, handling, operation and safe use of Pentair
vertical in-line pumps. This information should be given to
the owner/operator of this equipment. The following
instructions must be strictly adhered to get a safety and
failure-free operation.
APPLICATIONS:
The 382 SC series pumps are superior commercial in-line
pumps which have been manufactured and field tested under
the severest demands. Pumping applications for the 382 SC
include: hot or chilled water circulation, pressure booster
systems and cooling towers for office buildings, hotels,
hospitals, universities and warehouses.
ATTENTION: SAFETY WARNINGS:
Read and understand all the warnings before installation or
servicing pump.
•Handling, transportation and installation of this
equipment should only be undertaken by trained
personnel with proper use of lifting equipment. (Refer
lifting arrangements “FIG. 3”)
•Only water or other suitable HVAC media may be
circulated through the use of these pumps. Circulation of
hazardous, corrosive or flammable liquids by using these
pumps is strictly prohibited.
•DO NOT turn on the electrical supply to the pump until
all the plumbing connections and commissioning
procedure have been accomplished.
•The pump must not be operated dry without fluid.
•Pipe systems must be installed in such a manner so that
minimum load is transferred on pump flanges.
•Ensure that the motor installation instruction manual has
been followed for determining the proper terminal
connections so that correct pump rotation is obtained.
OPERATIONAL LIMITS: *
•Maximum operating pressure at temperature 150°F
(65.6°C) is:
i. 125# Flanges: 175 PSI
ii. Up to 250 PSI dependent on the Mechanical Seal
•Maximum operating temperature: 225°F (107°C)
(Standard Seal)
•Pump Speed and Head: Refer the pump nameplate
*See ASTM A126/ANSI B16.1 for pressure/temperature
ratings of flanges
NOISE & VIBRATION LEVELS:
382 SC pumps are designed to meet the noise and vibration
levels as per HI standard 9.6.4.
ELECTRICAL SAFETY:
HIGH TEMPERATURE SAFETY:
HIGH PRESSURE SAFETY:
CALIFORNIA PROPOSITION 65 WARNING:
Warning: This product and related
accessories contain chemicals known to the State of
California to cause cancer, birth defects or other
reproductive harm.
"
Warning: Expansion Hazard
Water expands when heated. Install properly sized
thermal expansion tanks and relief valves. Failure to
follow these instructions could result in serious personal
injury, death or property damage.
"
Warning: Spraying Water Hazard
When servicing pump replace all gaskets and seals. Do
not re-use old gaskets or seals. Failure to follow these
instructions could result in serious personal injury, death
or property damage.
Warning: Hot Surface Hazard
If pumping hot water, insure guards or proper insulation
is installed to protect against skin contact to hot piping or
pump components. Failure to follow these instructions
could result in serious personal injury, death or property
damage.
Warning: Electrical Overload Hazard
Insure all motors have properly sized overload protection.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: Electrical Shock Hazard
All electrical connections are to be made by a qualified
electrician in accordance with all codes and ordinances.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
"
Warning: Sudden Start-Up Hazard
Disconnect and lockout power source before servicing.
Failure to follow these instructions could result in serious
personal injury, death or property damage.
Warning: High Pressure Hazard
All single suction pumps are rated at a maximum of 175
psi and double suction pumps are rated at 250 psi. Do not
exceed this pressure. Install properly sized pressure relief
valves in system. Failure to follow these instructions
could result in serious personal injury, death or property
damage.
"

3"
"
PRODUCT DESCRIPTION"
CONFIGURATION:
Pumps are offered with various Mechanical seal types
available.
•Type 1
•Type 21
•Type 8B2
Along with above mentioned configurations, pumps are also
offered with following options required and mentioned by
customer at the time of placing order.
•With or without Impeller wear rings
•With or without Flush line
•With or without Abrasive separator
PARTS:
Refer Exploded view, FIG. 11 for listing various parts
INSTALLATION
READ AND UNDERSTAND ALL SAFETY WARNINGS
AT THE BEGINNING OF THE MANUAL BEFORE
BEGINNING INSTALLATION OR ANY REPAIR
WORK.
PUMP LOCATION:
The pump should be located as close to the liquid source as
possible so that the suction line can be short and direct.
Location should require a minimum of elbows and fittings in
the discharge line to minimize friction losses. The pump must
be protected against flooding and located in a clean, open area,
where it is easily accessible for inspection, disassembly and
repair.
To minimize friction losses pump should be located such that
the use of elbows and fittings in the discharge line is reduced.
Pumps installed in dark, dirty areas or in cramped locations
are often neglected, which can result in premature failure of
both the pump and the driver. Open area would also be helpful
in better air flow into the motor and/or motor fan.
The 382 SC pump must be installed
vertically. Install isolating valves on
each side of pump so that pump
maintenance can be performed
without draining the system. Special
mounting requirements may be
required if the pump is to be
mounted near a noise or vibration
sensitive area. The installation must
be evaluated to ensure that the net
positive suction head available
(NPSHA) meets or exceeds the net FIG.1
positive suction head required (NPSHR), as stated by the
pump performance curve.
STORAGE & PROTECTION:
All pumps are shop serviced and delivered in a ready to
operate condition. If the pump after being delivered is not put
into immediate operation then proper care should be taken so
that it operates without failure when put into service. The
pump should be kept in a clean and dry area in a vertical
position. Ensure that the following precautions are taken for
pumps being stored for more than six months.
•Pump surfaces which are machined and unpainted (e.g.
flange ends, feet mounting etc.) and are easily subjected
to corrosion must be protected by corrosion resistant
coating.
•The pump shaft should be rotated once in a month to
avoid locking of rotating assembly. This would also be
helpful in uniform distribution of lubrication on bearings.
•Bearings must be lubricated with fresh lubricants when
pump is being put into service after a long time.
UNCRATING AND LIFTING:
Before shipment pump is fastened securely to the crate. The
pump should be removed from the crate carefully by using
proper tools and equipment. After removing from crate make
sure that all the components are in good condition and have
been received as mentioned in the packing list. Report
immediately to the concerned person/department if any
component is missing or received in a damaged condition.
Extreme care must be taken while handling the pump set.
Slings and hooks should be used in such a manner, so that
while lifting the pump is not exposed to stresses.
METHODOLOGY TO ORIENT PUMPS VERTICALLY
WHILE UNPACKING THE UNIT.
Since the pumps are shipped horizontally laid on crate (shown
in FIG.2). It is necessary to orient pumps vertically before
shifting to their installation location. Once the unit is
uncovered, lift the unit by placing straps around the motor
while making a pivot point of casing. Human effort will also
be required to orient the unit to vertical position. Now let the
unit to rest on crate and follow the procedure mentioned
below to place the unit to its desired location.
FIG. 2
NOTE:
For typical installation, suitable overhead lifting equipment of
adequate capacity to lift the driver, the entire pump (without
driver), or the heaviest sub assembly of the pump should be
available at the jobsite when installing or removing the pump.

4"
"
Use following procedure for lifting the pump set.
i. Remove the coupling guard
ii. Place lifting straps/slings on each side of coupling
through the motor bracket as shown in the FIG.3.
iii. Use spreader bar in between the slings if necessary. This
would be helpful for protecting the motor fan cover
while lifting.
iv. DO NOT use eye bolt or lifting lugs on motor and/or
motor bracket for lifting the entire unit.
v. DO NOT place cable slings around the motor shaft.
FIG.3
COMMISSIONING
MOUNTING:
The pump has been designed to be installed in various
configurations as shown in the images below.
1. HANGER SUPPORTED PIPE MOUNTED:
(Models 10x10x19, 10x10x14, 12x12x14, 12x12x18,
14x14x15 and 14x14x18 Only)
Where floor space is a restriction, 382 SC Vertical Inline
pump can be installed in the system piping without any
additional support from base, illustrated in FIG.4. For
such an installation, care must be taken to ensure that
pipe hangers are designed to bear additional weight of
pump set.
FIG. 4
2. PIPE MOUNTED SUPPORTED AT CEILING:
(Models 10x10x19, 10x10x14, 12x12x14, 12x12x18,
14x14x15 and 14x14x18 Only)
In tight rooms pump can be installed directly into the
system piping with no base support and piping can be
supported close to ceiling. With this arrangement the
pump may be installed with a multi-purpose valve on the
discharge side and suction diffuser on the suction side of
the pump, as illustrated in FIG.5.
"
"
"
FIG 5.
3. FLOOR SADDLE SUPPORT:
(Models 10x10x19, 10x10x14, 12x12x14, 12x12x18,
14x14x15 and 14x14x18 Only)
In many of the installation locations where support to
pump from above is not possible, floor mounted saddle
support can be provided beneath suction and discharge
piping. The pump case may be mounted on a base in
such an installation but is not necessary. The installation
is illustrated in FIG.6.

5"
"
"
FIG.6
4. PIPE SUPPORTS:
(Models 10x10x19, 10x10x14, 12x12x14, 12x12x18,
14x14x15 and 14x14x18 Only)
For ease of installation and increasing rigidity of the unit,
a Structural support may be provided at the pump suction
and discharge ports with Isolation pads beneath the
support, as illustrated in FIG.7. It is to be ensured that
pipe hangers are so adjusted that pump flanges do not
support the piping.
FIG.7
5. FLOOR MOUNTED:
It is recommended that larger double suction vertical in-
line pumps be floor mounted. This recommendation is
based on the account of weight of pump and motor
assembly. A mounting base is to be used for floor
mounting which can be fastened to the integral cast in
feet on the bottom of casing, as illustrated in FIG.8.
Make sure that pump is firmly bolted to the mounting
base which in turn is also rigidly secured and mounted on
the floor. During floor mounting it is recommended that
flexible connectors are used to eliminate the potential for
pipe load to be transferred to the pump. If flexible
connectors are not used, it is very important to closely
monitor the height of the pump support. If the height of
support is more than required then the entire pipe load
will be transferred to the pump which will start acting
like a pipe support.
"
FIG.8A
FIG.8B
While installing the pump unit in pipeline, it is
recommended to use standard piping supports on either
side of the pump to eliminate pipe stresses. For
supporting the pump from bottom, case feet has been
drilled and tapped to incorporate pipe flange supports of:
S. No.
PUMP NAME
FEET DRILLING
AS PER FLANGE
1
2x7, 2x9C
2”
2
2-1/2x7, 3x7A&7B,
4x7A&7B, 2-1/2x9,
3x4x9, 4x5x9
3”
3
5x9, 6x9,
4x11, 5x11, 6x11,
8x11,
4x12, 5x12, 6x12,
8x12
4”
4
8x15, 10x15
6”
5
10x14, 10x19
8”
6
12x14, 12x18, 14x15,
14x18
10”
PIPING:
A minimum length of straight pipe is required on the suction
side of the pump. Five times the pipe diameter is sufficient to
allow a smooth entry of liquid into the pump.
Avoid using short elbows as they tend to give higher friction
losses and interruption in streamline flow. Suction and
discharge piping must be in line. To avoid undue stresses on
pump and pipe flanges, never force align the pipes and
provide a rigid support near the pump casing. Pump flanges
must be tightened evenly to avoid flange cocking and liquid
leakage.

6"
"
Air leak/trapped in suction piping is one of the major cause of
erratic pump performance. To avoid any such kind of trouble,
suction piping should be arranged on such a manner that there
are no high spots. This is to ensure that air is not trapped in
the suction line which will cause faulty pump operation.
Wherever suction line is larger than the pump suction nozzle,
it is mandatory to use an eccentric reducer. For sumps below
center line the straight side of the reducer must be located
upwards so that any air cavity if present in the suction line
passes through the line to outlet and there is no pressure drop
at pump suction due to presence of air pockets.
The check valve must be installed in the discharge line which
prevents backward flow of liquid into the pump, thereby
protecting the pump from liquid back pressure.
Note: The suction valve should be fully open and not be used
for flow regulation. The discharge valve is used for flow
regulation.
OPERATION
The following points must be ensured before starting the
pump:
i. The current supply agrees with the voltage and frequency
on the motor nameplate.
ii. The motor is wired for correct voltage.
iii. The thermal overload relays are correct size and set for
operation.
iv. The pump is fully primed. Flood the casing and seal area
with liquid to release the air out of pump through flush
line and air vent valve near discharge flange. Priming
must be continued till air is completely removed. This
would be indicated by continuous flow of liquid through
flush line and air vent. If, accessible, rotate shaft slowly
by hand to evacuate air trapped in the impeller passages
and to ensure free turning of the pump.
a. Failure to flood the seal area with water may
cause seal failure due to lack of lubrication.
v. Jog the motor to check that the motor rotates clockwise,
as indicated by the arrow on the pump casing.
vi. Coupling guard must be in its appropriate position on
account of human safety.
STARTING UP:
NOTE: MAKE SURE SUCTION LINE VALVE IS IN OPEN
POSITION AND DISCHARGE LINE VALVE CLOSED
1. Check that the pump is operating smoothly and is not
rubbing.
2. Start opening the discharge valve gradually.
(Note: Do not run the pump for extended period with
discharge valve closed, so as to avoid overheating and
potential damaging loads.)
3. The pump is also provided with a circulation relief valve
that prevents overheating when the pump is operating at
reduced capacity.
4. Stop the pump immediately if any of the following
situations arise:
i. No/insufficient liquid.
ii. Inadequate discharge pressure.
iii. Loss of suction pressure.
iv. High power consumption.
v. Noisy operation and/or High Vibration.
Check the manual for troubleshooting the cause.
SHUT DOWN:
It is advisable to close the discharge valve before stopping the
pump to avoid any water hammer effect. However, this
practice is not mandatory and pump may be stopped with
discharge valve open in case an emergency.
Preferred shutdown sequence is as follows:
1. Preferably close the discharge valve first.
2. Then turn off the motor.
3. Now, close the suction line valve.
4. Drain the pump liquid completely, if pump to be kept un-
operational for longer period or if there is danger of
freezing.
MAINTENANCE AND SERVICE
MAINTENANCE AND SERVICE TO THE PUMP
ROUTINE CHECK-UP:
Preventive maintenance and routine check-ups may prevent
the pump from major failures. An inspection & maintenance
log should be kept & the inspector is to immediately report
any problems. Pump should be checked on regular basis for
any unusual noise, vibrations and abnormal rise of
temperature. A suggested guide for preventive maintenance
for normal application is given below:
Items
Action
required
Frequency
Vibration
Check for
change in
vibration
Refer to ANSI/HI 9.6.5
Condition Monitoring
Bolting
Check for
loose bolting
Annually
Mechanical
Seals
Monitor seal
leakage
Refer to ANSI/HI 9.6.5
Condition Monitoring
LUBRICATION:
The pump does not contain any bearings that require
lubrication; however motor bearings must be lubricated
periodically. In dry locations, each bearing will need
lubrication at least after every 4,000 hours of running time or
6 to 12 months, whichever is more frequent. In wet locations
(exposed to dripping water, to the weather or to heavy
condensation found in unheated or poorly ventilated
underground locations) every 2,000 hours or every 3 to 6
months, whichever is more frequent.
Refer motor manufacturer’s instructions manual for frequency
of lubrication and correct amount of lubricant.
SPLIT COUPLING
Power is transmitted from motor shaft to the pump shaft
through a split coupling. The pump shaft does not contain
bearings that need lubrication.

7"
"
Rotating(part(
"
Outboard(part(
(
Inboard(gasket(
(
Impeller(End(
gasket(
(
Stationary(part(
(
Gland(
"
MECHANICAL SEAL
The mechanical seal require flushing which is flushed from
discharge of the pump through a flush line. A throttle bush
isolates the mechanical seal from the liquid in the pump.
Since mechanical seals need a film of liquid between the
sealing faces, pump must not be run unless properly filled
with liquid for intended operation.
A ‘weep’ sound may be heard from Mechanical seals at start-
up. The pump should be made run for approx. 8-10 hours,
which is the break-in period for seal. During this operation the
mechanical seal would ‘seat’ properly.
The 382 SC pumps are supplied with three basic types of seals
1. Seal type 1
2. Seal type 21
3. Seal type 8B2
Mechanical Seal (Type 1 & 21)
FIG.9
Mechanical Seal (Type 8B2)
FIG.10
RECOMMENDED SPARE PARTS LIST:
Although all the components could be procured by the
customer at short interval, however to reduce downtime the
below mentioned components should be kept handy in case
the pump is to be shut down for maintenance. The
components are:
•Mechanical seal
•Wear rings
•Gaskets, O-rings, seals
CONSUMABLES:
Following items are of regular use during preventive &
accidental maintenance and must be kept in stock by the
customer.
•Lubricants
•Cleaning materials
•Touch up coating
REQUIRED TOOLS AND FIXTURES:
Pump assembly and disassembly can be performed by using
standard hand tools available in market. For quick reference,
tools required for disassembly of various pump components
are mentioned below:
FOR PUMPS (10x10x14, 10x10x19, 12x12x14, 12x12x18)
Hardware
Location
Wrench size &
type
(in inches)
Hex Bolt
Motor Bracket - motor
mounting flange side
15/16 open end
wrench
Heavy
Hex Nut,
Hex bolt
Motor Bracket -motor
mounting flange side,
Motor Bracket register
flange
1-1/8 open end
wrench
Hex Bolt
Coupling guard & motor
bracket
1/2 open end
wrench
Allen Bolt
Coupling
1/2 Allen key
Heavy
Hex Nut
Coupling
7/8 open end
wrench & 3/8
socket head
wrench
Hex screw
/bolt
Gland & gland Jacking,
Gland for external
mechanical seal
3/4 open end
wrench
NPSF
plug
Suction & Discharge
pressure gauge, Air vent
& Drain, Recirculation
relief
9/16 open end
wrench
Set screw
Coupling
1/4 Allen key
Retainer
ring
Pump shaft
External retainer
ring pliers
FOR PUMPS (14x14x15, 14x14x18)
Hardware
Location
Wrench size &
type

8"
"
(in inches)
Hex Bolt
Motor Bracket -
motor mounting
flange side
1-1/8 open end
wrench
Heavy Hex Nut,
Hex bolt
Motor Bracket -
motor mounting
flange side, Motor
Bracket register
flange
1-1/4 open end
wrench
Hex Bolt
Coupling guard &
motor bracket
1/2 open end
wrench
Allen Bolt
Coupling
1/2 Allen key
Heavy Hex Nut
Coupling
1-1/16 socket
head wrench
Hex screw /bolt
Gland & gland
Jacking, Gland for
external
mechanical seal
3/4 open end
wrench
NPSF plug
Suction &
Discharge
pressure gauge,
Air vent & Drain,
Recirculation
relief
9/16 open end
wrench
Set screw
Coupling
3/8 Allen key
Retainer ring
Pump shaft
External retainer
ring pliers
In addition to the above mentioned tools some additional
equipment’s & fixtures may be required which are mentioned
below:
•Lifting devices (crane, hoist, lifting chains or straps)
•Impeller puller (to remove pressed-on impeller from
shaft)
•Torch (to heat parts to aid in removal)
•Die grinder (to cut out wear rings or sleeves, if
needed)
•Work table or fixture for holding pump
•Measuring equipment (feeler gauges, dial indicator,
etc.)
FASTENER TORQUES AND SEQUENCE
Proper tightening of bolting is very important. Torque values
will vary depending on the size and grade of bolting used.
Torque values for coupling bolts and grub screws and
sequence of their tightening are mentioned in the following
section for replacement procedure of mechanical seals.
REPAIRS
READ AND UNDERSTAND ALL SAFETY WARNINGS
AT THE BEGINNING OF THE MANUAL BEFORE
BEGINNING INSTALLATION OR ANY REPAIR
WORK
This repairs section is broken into two parts. The first part
covers the replacement of the mechanical seal. The second
part covers complete pump disassembly. Refer to the
exploded pump diagram (FIG.32,33,34) for Item numbers.
MECHANICAL SEAL REPLACEMENT
•SEAL REPLACEMENT MODELS
(Models 1.5x1.5x9B, 2.5x2.5x7, 2.5x2.5x9, 2x2x12, 2x2x7,
2x2x9A/B/C, 3x3x12, 3x3x7A/B, 3x3x9A/B, 3x4x9, 4x4x11,
4x4x12, 4x4x7A/B, 4x4x9A/B, 4x5x9, 5x5x11, 5x5x12,
5x5x9, 6x6x11, 6x6x12, 6x6x9, 8x8x11, 8x8x12, 8x8x15 and
10x10x15)
FIG.10
1. Insure the electrical power is locked out, the system
pressure has been lowered and temperature of the unit is
at a safe level.
2. Isolate the pump from the system by closing the valves
that should be located on the suction and discharge side
of the pump. Loosen one of the pipe plugs (#4) and drain
the pump.
3. Remove the coupling guards (#17) by removing the four
(per side) retaining bolts (#4). Loosen the feral nuts on
the tubing connectors (#1) and remove the gland flushing
tubing (#3).
4. Remove the four gland bolts (#55) and utilizing the two
wing nuts (#52) jack the seal gland (#44) upward until
the top surface of the seal gland is in firm contact with
the bottom of the retaining ring (#41A). With the wing
nuts finger tight against the gland the weight of the shaft
(#40) and impeller (#11) can now be supported by the
5. Remove the six socket head coupling bolts (#48) along
with the nuts (#50) and lock washer (#49). The two
coupling halves (#45) can now be pulled away from the
shaft.

9"
"
6. Remove the two annular (round) keys (#46 & #47) as
well as the two linear (square) keys (#53 & #54).
7. Carefully lower the shaft impeller assembly by backing
off on the two gland supporting wing nuts until the face
of the impeller rests inside the casing
8. Remove the snap ring (#41A) from the shaft.
9. The gland (with the stationary seat of the mechanical seal
pressed internally) can be removed through the gap
present between the pump shaft and the motor shaft.
10. Pry the old mechanical seal rotating head (#27) up and
off the pump shaft. Remove the stationary seat of the
mechanical seal from the gland. Remove the O-Ring
gasket (#43) from the groove on the bottom of the gland.
Clean all surfaces, checking for nicks and sharp edges
that may damage the elastomers on the mechanical seal
or the gland
If the pump is to be fully disassembled stop at this point
and proceed to Step 1 under the section titles “Complete
Pump Disassembly”
11. To replace the mechanical seal, lubricate the
stationary seat bore in the gland with soapy water
mixture and press in the seat insuring it is flat in the
bore. Replace the gland O-ring, holding in the
groove with a small amount of non-hardening
silicon or grease.
12. Lubricate the pump shaft with a soapy water and
first place the spring retainer over the shaft,
followed by the spring and finally the rotating head
of the seal.
13. Place the gland down on the shaft and insure the
two jacking holes on the side of the gland are
engages with threaded rod and wing nuts. Replace
the external retaining ring making sure it is in the
grove of the shaft.
14. Using 1/2 of the split coupling as a guide, (the thin
groove cut into the top of the coupling identifies the
motor side of the coupling), utilize the wing nuts to
raise the shaft (with impeller) upward to align the
annular grooves on the coupling with the grooves on
the shaft. Place one half of the motor annular key in
the motor shaft groove. Place the linear motor key
in the motor shaft. Place the linear pump key in the
pump shaft and align the two linear keys so the
coupling half fits both motor and pump shaft. Slide
in the pump shaft annular key half (additional
adjustment of the wing nuts maybe necessary as the
key to groove fit is close). Place the second pump
shaft and motor annular keys in their respective
grooves and rotate the key 90 degrees so they stay
in place. Place the other half of the split coupling
onto the shafts. Replace the 6 socket head cap
screws (3 sockets facing in on one side and 3 facing
out on the other side requiring rotating the shaft 180
degrees to tighten the cap screws) and add lock
washers and nuts. Adjust the socket head cap screws
so the gap between the coupling halves is even.
Tighten the socket head cap screws in a crosswise
pattern to the torque listed in the table below.
SPLIT COUPLING BOLT TIGHTENING TORQUE
Bolt Size
Hex Socket Size
Torque (ft-lbs)
3/8 inch
5/16
35
1/2 inch
3/8
90
15. Lower the gland by utilizing the wing nuts, replace
the four gland bolts and tighten the gland down
evenly. After the gland is tightened down, tighten
the two wing nuts to the underside of the gland
(holding them stationary and preventing them from
vibrating).
16. Reinstall the flush tubing. Insure the coupling
rotates freely with no dragging or binding. Replace
the coupling guards and refer to the beginning of the
manual for startup instructions.
•SEAL REPLACEMENT MODELS
(Models 10x10x19, 10x10x14, 12x12x14, 12x12x18,
14x14x15 and 14x14x18 only)
FIG. 11
Refer the Tools mentioned in the required tools and
fixtures for pump disassembly
REPLACING THE MECHANICAL SEAL
1. Ensure the electrical power is locked out, the system
pressure has been lowered and temperature of the unit is
at a safe level.
2. Isolate the pump from the system by closing the valves
that should be located on the suction and discharge side
of the pump. Loosen one of the pipe plugs (#4) and drain
the pump.
Drain plug to
be removed

10"
"
FIG. 12
3. Remove the coupling guards (#17) by removing the four
(per side) cap screws (#18). Loosen the ferrule nuts on
the tubing connectors (#1) and remove the gland flushing
tubing (#3).
FIG. 13
If 8b2 Mechanical seal has to be replaced stop at this point
and proceed to step 28
FOR TYPE 21 MECHANICAL SEAL
4. Loosen the four gland bolts (#55) and utilize the two
bolts out of four gland bolts for jacking, keeping the
other two engaged with the gland to restrict the motion of
the gland about shaft axis.
FIG. 14
5. Jack the seal gland (#44) upward until the top surface of
the seal gland makes a firm contact with the bottom of
the retaining ring (#41A).
6. With the bolts (#55) tightened against the gland, the
weight of the shaft (#40) and impeller (#11) can now be
supported by the gland and the split coupling (#45) can
be removed without the shaft dropping.
7. Remove the four coupling set screws (#20) followed by
six/four socket head coupling bolts (#48) along with the
nuts (#50) and spring washer (#49). The two coupling
halves (#45) can now be pulled away from the shaft.
FIG. 15
8. Remove the two linear (square) keys (#53, #54).
FIG. 16
9. Carefully lower the shaft impeller assembly by backing
off on the two gland supporting bolts until the face of the
impeller rests inside the casing.
10. Remove the retaining ring (#41A) from the shaft.
11. Remove two remaining gland bolts (#55) which are
engaged with seal plate (#35).
12. The gland (#44) (with the stationary seat of the
mechanical seal pressed internally) can now be removed
through the gap present between the pump shaft and the
motor shaft.
FIG. 17
13. Pry the old mechanical seal (#27) rotating head, spring &
spring retainer up and off the pump shaft.
14. Remove the stationary part of the mechanical seal from
the gland. Remove the O-Ring gasket (#43) from the
groove on the bottom of the gland.
FIG. 18
If the pump is to be fully disassembled proceed to Step 1
under the section titled “COMPLETE PUMP
DISASSEMBLY” otherwise continue for installation of
the Mechanical Seal.
Move Gland bolts
to these holes to
use as Jacking bolts
Gland bolts
Coupling guard
removed
Stationary part
Set screws
(x4)
Coupling Bolts
(x6/4)
Motor key
Pump key
Gland removed
through gap
between shafts
O-ring gasket
Gland