INOXPA SLR Series Manual

INSTALLATION, SERVICE AND MAINTENANCE INSTRUCTIONS
LOBE PUMP
SLR
Original Instructions
01.500.30.03EN
(0) 2019/12
01.500.32.0001

01.500.30.05EN
(0) 2019/09
(1) The serial number may be preceded by a slash and by one or two alphanumeric characters
01.500.30.05EN
(0) 2019/09
EC Declaration of Conformity
We,
INOXPA, S.A.U.
Telers, 60
17820 –Banyoles (Girona) - Spain
Hereby declare under our sole responsibility that the machine
LOBE ROTOR PUMP
Designation
SLR
Type
SLR 0-10, SLR 0-20, SLR 0-25, SLR 1-25, SLR 1-40, SLR 2-40, SLR 2-50,
SLR 3-50, SLR 3-80, SLR 4-100, SLR 4-150, SLR 5-125, SLR 5-150
From serial number IXXXXXX to IXXXXXX (1) / XXXXXXXXIIN to XXXXXXXXIIN (1)
Fulfills all the relevant provisions of the following directive:
Machinery Directive 2006/42/CE
Applicable harmonized standards:
EN ISO 12100:2010
EN 809:1998+A1:2009/AC:2010
EN 60204-1:2006+A1:2009
In compliance with Regulation (EC) 1935/2004 relating to materials and articles intended
to come into contact with food.
The technical file has been prepared by the signer of this document in INOXPA S.A.U.
David Reyero Brunet
Technical Office Manager
Banyoles, 30th September, 2019

INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12 3
1. Table of contents
1. Table of contents
2. Generalities
2.1.Instructions manual.......................................................................................................................................5
2.2.Compliance with the instructions ..................................................................................................................5
2.3.Warranty........................................................................................................................................................5
3. Safety
3.1.Warning symbols...........................................................................................................................................6
3.2.General safety instructions ...........................................................................................................................6
4. General Information
4.1.Description....................................................................................................................................................8
4.2.Principle of operation ....................................................................................................................................8
4.3.Application.....................................................................................................................................................8
5. Installation
5.1.Reception of the pump..................................................................................................................................9
5.2.Identification of the pump..............................................................................................................................9
5.3.Transport and storage.................................................................................................................................10
5.4.Location.......................................................................................................................................................10
5.5.Coupling......................................................................................................................................................11
5.6.Pipes...........................................................................................................................................................12
5.7.Secondary piping ........................................................................................................................................13
5.8.Relief valve (pressure bypass)....................................................................................................................14
5.9.Electrical installation ...................................................................................................................................14
6. Start-up
6.1.Checks before starting the pump................................................................................................................16
6.2.Checks when starting the pump..................................................................................................................16
6.3.Relief valve (pressure bypass)....................................................................................................................16
7. Troubleshooting
8. Maintenance
8.1.General considerations...............................................................................................................................19
8.2.Check the mechanical seal.........................................................................................................................19
8.3.Maintenance of the seals............................................................................................................................19
8.4.Oiling...........................................................................................................................................................20
8.5.Storage........................................................................................................................................................20
8.6.Cleaning......................................................................................................................................................20
8.7.Disassembly of the pump............................................................................................................................21
8.8.Assembly of the pump ................................................................................................................................24
8.9.Adjusting and synchronising the lobes .......................................................................................................26
8.10.Assembly / disassembly of the mechanical seal .......................................................................................28
9. Technical Specifications
9.1.Tightening torque........................................................................................................................................38
9.2.Particle size.................................................................................................................................................39
9.3.Weights.......................................................................................................................................................39
9.4.Dimensions .................................................................................................................................................40

4 INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12
9.5.SLR 0-20 / 0-25...........................................................................................................................................42
9.6.SLR 1-25 / 1-40...........................................................................................................................................44
9.7.SLR 2-40 / 2-50...........................................................................................................................................46
9.8.SLR 3-50 / 3-80...........................................................................................................................................48
9.9.SLR 4-100 / 4-150.......................................................................................................................................50
9.10.SLR 5-125 / 5-150 .....................................................................................................................................52
9.11.Relief valve ................................................................................................................................................54
9.12.Front heating jacket...................................................................................................................................55

Generalities
INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12 5
2. Generalities
2.1. INSTRUCTIONS MANUAL
This manual contains information regarding the reception, installation, operation, assembly, disassembly and
maintenance of the SLR pump.
Carefully read the instruction prior to starting the pump, familiarize yourself with the installation, operation and
correct use of the filter and strictly follow the instructions. These instructions should be kept in a safe location
near the installation area.
The information published in the instruction manual is based on updated data.
INOXPA reserves the right to modify this instruction manual without prior notice.
2.2. COMPLIANCE WITH THE INSTRUCTIONS
Not following the instructions may impose a risk for the operators, the environment and the machine, and may
result in the loss of the right to claim damages.
This non-compliance may result in the following risks:
•failure of important machine/plant functions,
•failure of specific maintenance and repair procedures,
•possible electrical, mechanical and chemical hazards,
•risk to the environment due to the type of substances released.
2.3. WARRANTY
Any warranty will be void immediately and lawfully and, additionally, INOXPA will be compensated for any civil
liability claims submitted by third parties, in the following cases:
•the service and maintenance work have not been carried out in accordance with the service instructions,
the repairs have not been carried out by our personnel or have been carried out without our written
authorisation,
•modifications have been carried out on our material or equipment without written authorisation,
•the parts or lubricants used are not original INOXPA parts and products,
•the material or equipment has been improperly used, has been used negligently, or has not been used
according to the instructions and their intended.
•The pump parts are damaged because they have been subjected to high pressure due to not having
used a safety valve.
The General Conditions of Delivery already in your possession are also applicable.
The machine may not undergo any modification without prior approval from the manufacturer.
For your safety, only use original spare parts and accessories.
The usage of other parts will relieve the manufacturer of any liability.
Changing the service conditions can only be carried out with prior written authorization from
INOXPA.
Please do not hesitate to contact us in case of doubts or if further explanations are required regarding
specific data (adjustments, assembly, disassembly, etc.).

Safety
6 INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12
3. Safety
3.1. WARNING SYMBOLS
Safety hazard for people in general and/or for equipment
Electric hazard
Important instruction for the protection of the equipment and its functions
3.2. GENERAL SAFETY INSTRUCTIONS
Read the instruction manual carefully before installing and starting the pump. Contact INOXPA in
case of doubt.
During the installation
The Technical specifications of chapter 9 should always be observed.
Never start the pump before connecting it to the lines.
Do not operate the pump if the pump casing and lantern protections are not fitted.
Check for proper specifications of the motors, especially it its working conditions create an
explosions hazard.
During the installations, all the electric work should be carried out by authorized personnel.
During operation
The Technical specifications of chapter 9 should always be observed. Under no circumstances can
the specified limit values be exceeded.
NEVER touch the pump or the pipework during operation if the pump is being used for transferring
hot liquids or during cleaning.
The pump contains moving parts. Never place your fingers inside the pump during operation.
NEVER operate with the suction and discharge valves closed.
NEVER spray water directly on the electrical motor. The standard motor protection is IP-55:
protection against dust and water spray.
During maintenance
The Technical specifications of chapter 9 shall always be observed.
NEVER disassemble the pump until the pipes have been emptied. Remember that liquid will
remain inside the pump’s pump casing (if does not have a purge). Bear in mind that the pumped
liquid may be hazardous or extremely hot. Consult the regulations in effect in each country for
these cases.
Do not leave loose parts on the floor.
ATTENTION
N

Safety
INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12 7
ALWAYS disconnect the electrical power to the pumps prior to carrying out any maintenance.
Remove the fuses and disconnect the cable from the motor’s terminals.
All electrical work must be carried out by authorized personnel.

General Information
8 INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12
4.General Information
4.1. DESCRIPTION
The SLR lobe pumps by INOXPA are part of our wide range of positive displacement rotary pumps for viscous
liquids.
The following models exist in the lobe pump range:
•The SLR pump normal flow rate suitable for pressures of up to 12 bar.
•The SLR pump with wider lobes, delivers a higher flow rate, and is suitable for pressure of up to 7 bar.
The Hyclean model has been specially developed to respond to all hygienic requirements in the food industry.
As regards hygiene, reliability and sturdiness, the complete range of lobe pumps satisfies all requirements set
by the aforesaid industry.
Its modular design enables optimal part interchange between the different pumps.
The lobe pumps are rotary displacement pumps. Owing to the contact between the internal parts, the pressure
variations, etc. they make a louder noise than centrifugal pumps. This noise must be taken into consideration
when installing these pumps.
This equipment is suitable for his use in food process.
4.2. PRINCIPLE OF OPERATION
The lobe pump is a positive displacement rotary pump. The top lobe is driven by the driving shaft. The lower
lobe is located on the driven shaft, and is driven via a helical gear. Both lobes rotate in synchronism without one
touching the other. When the pump is running they displace a set volume of liquid. The following figure shows
how a lobe pump operates.
A: When the lobes rotate, the space on the suction side increases because one lobe moves away from the
other, thus causing a partial vacuum that draws the liquid into the pumping chamber.
B: Each love void is filled consecutively as the shafts rotate and the liquid is displaced towards the discharge
side. The small clearances between the lobes and between the lobes and the walls of the pump body duly
cause the spaces to be rather well closed.
C: The pump body is completely full and the liquid leaks through the meshing of the lobes, knocking against the
space walls so as to thus complete the pumping action.
4.3. APPLICATION
The main advantage of the INOXPA lobe pump is its capacity to pump a great variety of viscous liquids, from 1
mPa.s up to 100.000 mPa.s.
Furthermore, it is capable of pumping liquid products that require very careful handling and liquids that contain
soft solids with only a minimum degradation of same.
The range of application for each type of pump is limited. The pump was selected for a given set of
pumping conditions when the order was placed. INOXPA shall not be liable for any damage
resulting from the incompleteness of the information provided by the purchaser (nature of the fluid,
rpm, etc.).
ATTENTION
01.500.32.0002

Installation
INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12 9
5.Installation
5.1. RECEPTION OF THE PUMP
INOXPA will not be liable for any deterioration of the material due to transport of unpacking.
Visually check that the packaging has not been damaged.
The following documentation is included with the pump:
•shipping documents,
•installation, service and maintenance instructions manual,
•instructions and servicing manual for the motor
1
.
Unpack the pump and check the following:
•The suction and discharge connections on the pump, removing any remaining packaging material.
•Check that the pump and motor have not suffered any damage.
•If not in good material condition and/or if not all the parts are included, the shipping carrier should submit a
report as soon as possible.
5.2. IDENTIFICATION OF THE PUMP
Each pump has a nameplate with the basic data required to identify the model.
1
If the pump has been supplied with a motor from INOXPA
01.500.32.0004
Serial number
01.500.32.0003

Installation
10 INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12
5.3. TRANSPORT AND STORAGE
The SLR pumps are often too heavy to be transported or lifted manually.
Use an adequate means of transport.
Use the points which are indicated in the drawing for lifting the pump.
Only authorized personnel should transport the pump.
Do not work or walk under the heavy loads.
Lift the pump as indicated below:
•Always use two support points placed as far apart as possible.
•Secure the support so that they will not move.
•See chapter 9. Technical specifications to consult dimensions and weights.
During the transport, disassembly or assembly of the pump, there is a risk of loss of stability and
that the pump could fall down and cause damages to the operators. Make sure that the pump is
properly supported.
5.4. LOCATION
•Place the pump as close as possible to the suction tank and it is possible below the level of the liquid.
•Leave sufficient space around the pump to provide access to both pump and motor. See chapter 9.
Technical specifications to consult dimensions and weight.
•Place the pump on a flat and level surface.
•The foundation must be hard, level, flat and vibration free.
Foundation
Install the pump base so that the drive and pump are level and well supported. Therefore, the pump unit should
be installed on a base plate –according to DIN 24259 –or on a frame, both placed exactly level on the
foundation. The foundation must be hard, level, flat, vibration free, etc. to prevent base distortion (to keep the
alignment pump –drive guaranteed while commissioning).
To install the pump unit on the foundation proceed as follows:
•Make holes in the foundation to fit foundation bolts. This is unnecessary when expanding screws are used
instead of foundation bolts.
•Place base plate or frame with the aid of shims horizontally on the foundation.
•Grout.
•When the grout has entirely hardened the pump unit can be placed on the baseplate or the frame. Tighten
the nuts on the foundation bolts carefully.
For other foundations consult INOXPA.
01.500.32.0005
ATTENTION
ATTENTION

Installation
INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12 11
Excessive temperatures
Depending on the fluid to be pumped, high temperatures can be reached inside and around the pump.
Over 68ºC the operator should take protective measures and place warning notices advising of the
danger which exists if the pump is touched.
The type of protection selected should not isolate the pump entirely. It should allow for the bearings
to be cooled more efficiently and for the bearings to be lubricated.
5.5. COUPLING
For the selection and fitting of the couplings, please refer to the supplier’s manual. In some cases, the starting
torque of positive-displacement pumps can be quite high. Therefore, the chosen coupling should be 1,5 to 2
times the recommended torque.
Alignment
The shaft of the pump and the motor of the pumping assembly were properly aligned at factory.
Align the shaft of the pump and the motor again after install the pumping assembly.
•Check the alignment of the pumping assembly after installation. If is necessary, realign.
•In the case of applications dealing with high temperatures the pump can be operated temporarily at its
working temperature. Then recheck alignment pump-piping.
•Place a straight-edge (A) on top of the coupling: the straight should make contact with both halves of the
coupling over their entire length. See the follow figure.
•Repeat the check, but this time on both sides of the coupling near the shaft.
Maximum alignment deviations:
Outside diameter of
the coupling [mm]
Va
[mm]
Va max. - Va min.
[mm]
Vr
[mm]
69
3
1,2
0,20
87
4
1,5
0,25
96
4
1,7
0,25
129
5
2,2
0,30
140
5
2,4
0,35
182
5
3
0,40
200
5
3,4
0,45
224
6
3,9
0,50
ATTENTION
01.500.32.0006

Installation
12 INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12
The coupling have to be adequately protected during the operating the pump to avoid possible accidental
accesses.
Do not operate the pump if the protectors are not installed adequately.
5.6. PIPES
•As a general rule, install the suction and discharge lines in straight sections, with the minimum possible
number of elbows and fittings in order to reduce any pressure losses that may be caused by friction.
•Make sure that the pump’s ports are properly aligned with the pipework and have a diameter similar to that
of the pump connections.
•Place the pump as close as possible to the suction tank and whenever possible below the liquid level, or
even below the tank level in order to achieve the largest possible static head for suction.
•Install support brackets for the lines as close as possible to the pump’s suction and discharge ports in order
to avoid vibrations and stress on the pump.
Shut-off valves
The pump may be isolated for maintenance. To accomplish this, shut-off valves must be installed and
connected to the pump’s suction and discharge connections.
These valves must ALWAYS be open during operation of the pump.
Self-priming process
In general terms, if the self-priming process is followed, should contain sufficient liquid to fill the internal
recesses and the void spaces thus enabling the pump to create a pressure difference.
However, if low viscosity fluids are to be pumped, a foot valve of the same or greater diameter as that of the
suction pipe should be installed. Alternatively, the pump can be installed with a “U” shaped piping.
The use of a foot valve is not recommended for pumping viscous liquids.
In order to eliminate air and gases from the suction pipe, the counter-pressure on the discharge pipe
should be reduced. When the self-priming process is used, the pump’s start-up should be done by opening
and emptying the discharge pipe which allows the air and gases to escape at a low counter-pressure.
Another possibility involves long pipes or when a check valve is installed in the discharge pipe; it is also
possible to install a by-pass with a shut-off valve on the discharge side of the pump. This valve shall be
opened in the case of priming and will allow air and gases to escape at minimum counter-pressure.
The by-pass should not lead back to the intake orifice but to the supply tank instead..
ATTENTION
01.500.32.0007

Installation
INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12 13
Pressurization tank
Since the double mechanical seal of the pump SLR has a balanced design allow to work with external liquid at
low pressure (buffer fluid) and with external liquid at high pressure (barrier fluid). In the even that it is necessary
to work at high pressure and a closed pressurization system be install, the assembly must be done following the
instructions manual of the pressure tank’s manufacturer.
The pressurization tank is only required if the pumped liquid’s safety rules demands it.
ALWAYS install the pressurization tank at a height of between 1 and 2 meters with respect to the
pump shaft.
ALWAYS connect the coolant inlet to the bottom connection on the seal chamber. The coolant will
then exit through the top connection on the chamber. See the follow figure.
For more information on the pressurization tank (installation, performance, maintenance, etc.), refer to the
instruction manual supplied by the manufacturer.
5.7. SECONDARY PIPING
The entrance of the auxiliary liquid must be at the bottom part and the exit at the upper part. This will ensure
that the auxiliary liquid fills completely the chamber where the secondary seal is housed.
Flushed mechanical seal / Quench
If the mechanical seal requires flush media, is not the responsibility of INOXPA the media supply and the
purchase and installation of piping.
Should be given to the compatibility of the handled liquid with the flush media. Choose the sealing
liquid so that unwanted chemical reactions are avoid. Also check the compatibility of the flush
media with seal elastomers.
The SLR pumps’ mechanical seal have female threaded inlet and outlet connection and are dependent upon
frame of the pump and type of quench system employed.
Double mechanical seal: liquid flush media
Use and filtered auxiliary liquid and free from impurities to obtain maximum service life of the seal. The auxiliary
liquid used must be chemically compatible with the pumped product to avoid the unwanted reactions in case of
the accidental mix. The choice of the auxiliary liquid is the customer’s responsibility.
ATTENTION
ATTENTION
01.500.32.0008
Installation drawing of the pressurization tank

Installation
14 INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12
Connect the quench so that the inlet is at the bottom and outlet is at the top (F). This will make a better
evacuation or air or gases possible.
Heating / cooling jackets
Heating / cooling jackets (S) are available on the front cover.
5.8. RELIEF VALVE (PRESSURE BYPASS)
The positive displacement lobe pumps must be protected from excess pressure when they are
operating. Consequently, all the SLR pumps can be fitted with a stainless steel pressure relief
valve or a pressure by-pass.
Protection
This valve protects the pumps and prevents excessively high pressure arising in the circuit. It reduces the
differential pressure (p) between suction and discharge, but not the maximum pressure within the plant.
Do not use the pressure relief valve to protect the system from excess pressure. It is designed to
protect the pump only as it is not a safety outlet
Operating principle
The pressure by-pass valve is located in the rotor case and prevents excess pressure arising inside the pump.
For example, when the pump’s discharge port is clogged and the liquid cannot be pumped out, too high a
pressure can cause serious damage to some of the pump’s parts. The pressure relief valve opens a passage
from the pump’s discharge side to its suction side: an escape route, redirecting the flow again to the suction side
whenever specifically high pressure levels are reached. The by-pass is effective in both directions of rotation
(only front cover assembly).
If the relief valve operates, this will mean that the equipment is not working properly. The pump
should be disconnected immediately. Identify and solve the problem before re-starting the pump.
Remember that the pressure relief valve is not able to be used to regulate the flow rate.
5.9. ELECTRICAL INSTALLATION
Only qualified personnel can connect the electric motors.
Take the necessary measures to prevent damage to cables and connections.
ATTENTION
01.500.32.0009
ATTENTION
ATTENTION
ATTENTION

Installation
INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12 15
Electrical equipment, terminals and components of the control systems may still carry current when
they are disconnected. Contacting them may impose a hazard to operators or cause irreparable
material damage.
Before handling the pump, make sure that the motor is stopped.
Connect the motor in accordance with the instructions supplied by the motor manufacturer.
Check the direction of rotation (see the signalling label on the pump).
Start and stop the pump motor momentarily. Make sure that the direction of rotation is correct. If the pump
rotates in the wrong direction it could cause serious damage.
ALWAYS check the direction of rotation of the motor with liquid inside the pump.
For models with a seal chamber, ALWAYS ensure that it is full of liquid prior to checking the
direction of rotation.
ATTENTION
01.500.32.0010

Start-up
16 INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12
6. Start-up
Prior to starting the pump, carefully read the instructions in section 5. Installation.
Carefully read section 9. Technical specifications. INOXPA will not be liable for improper use of the
equipment.
NEVER touch the pump or the lines if hot liquids are being pumped.
6.1. CHECKS BEFORE STARTING THE PUMP
Completely open the shut-off valves on the suction and discharge lines.
Check oil level of the pump. Add correct grade of oil as necessary to maintain level in the center of oil sight
glass (in the case of first start-up: pumps are shipped with oil in the gearbox, nevertheless this check may
be skipped).
If liquid does not flow towards the pump, fill it with the liquid to be pumped.
The pump must never turn dry.
Check that the power supply matcher the rating indicated on the motor plate.
Check that the direction of rotation of motors is the right one.
If the pump has a single or double mechanical seal with buffer or barrier fluid, mount the auxiliary
connection corresponding to the values indicated in chapter 9. Technical specifications.
6.2. CHECKS WHEN STARTING THE PUMP
•Check that the pump is not making any strange noises.
•Check if the absolute inlet pressure is sufficient to prevent cavitation in the pump. Check the curve to obtain
the minimum required pressure above the vapour pressure (NPIPr).
•Control the discharge pressure.
•Check for leaks in the sealing areas.
Shut-off valves on the suction pipe must not be used to regulate the flow. All shut-off valves must
be fully open during operation.
Control the motor consumption to prevent an electrical overload.
If is necessary, reduce flow and motor power consumption by reducing motor speed.
6.3. RELIEF VALVE (PRESSURE BYPASS)
The pressure at which the valve opens depends on the fluid to be pumped, the viscosity, the rpm, etc., which
means that prior to starting the pump, the user must set the opening pressure of the relief valve.
When the pump incorporates a relief valve, the valve is set to the pump’s maximum working pressure. The user
must verify this by checking the position of the pin (55D). At the maximum set pressure, the pin has moved out
all the way toward the pump cover.
ATTENTION
ATTENTION

Start-up
INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12 17
In order to set the correct opening pressure, proceed as follows:
Loosen the nut (54C).
Use a spanner to turn the adjustment screw (25A) to the right to reduce the spring tension and get the
desired opening pressure. While carrying out this operation, we can see how the pin (55D) moves away
from the pump cover.
When the desired opening pressure has been set, tighten the nut (54C).
If the relief valve is not working properly, the pump must be put out of service immediately.
The valve must be checked by INOXPA’s technical service personnel.
Tamaño
2-5 bar
2-7 bar
5-8 bar
7-12 bar
SLR 0-10
X
X
SLR 1-25
X
X
SLR 1-40
X
SLR 2-40
X
X
SLR 2-50
X
SLR 3-50
X
X
SLR 3-80
X
SLR 4-100
X
X
SLR 4-150
X
SLR 5-125
X
X
SLR 5-150
X
Types of springs that can be mounted depending on the set pressure
01.500.32.0011
ATTENTION

Troubleshooting
18 INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12
7. Troubleshooting
The attached table lists solutions to problems that may arise while operating the pump. It is assumed that the
pump has been properly installed and that is has been selected correctly for the specific application.
Contact INOXPA if technical assistance is required.
Motor overload
The pump flow or pressure is insufficient
There is no pressure on the discharge side
Irregular discharge flow rate/pressure
Noise and vibrations
The pump gets clogged
Pump overheated
Abnormal wear
Leak through the mechanical seal
PROBABLE CAUSES
SOLUTIONS
•
•
Wrong rotation direction
Invert the rotation direction
•
•
•
•
Insufficient NPIP
Rise the suction tank
Lower the pump
Reduce the speed
Increase the diameter of the suction pipe
Shorten and simplify the suction piping
•
Pump not purged
Purge or fill
•
•
•
•
Cavitation
Increase suction pressure
•
•
•
•
The pump sucks in air
Check suction pipe and all its connections
•
•
•
Suction pipe clogged
Check the suction pipe and filter(s), if any
•
•
•
Wrong setting of the bypass valve
Check the bypass valve’s setting
•
•
Discharge pressure too high
If is necessary, reduce the loss of head by
increasing the diameter of the discharge pipe
•
•
•
•
•
•
Viscosity of the liquid is too high
Reduce the viscosity, for example, by heating the
liquid
Reduce the pump speed
Viscosity of liquid too low
Increase the viscosity, for example, by cooling
the liquid
Increase the pump speed
•
•
•
•
•
Temperature of liquid too high
Reduce the temperature by cooling the liquid
•
•
•
•
Pump speed too high
Reduce the pump speed
•
•
•
The lobes are worn
Replace the lobes
•
Pump speed too low
Increase the pump speed. Check the motor
power is sufficient.
•
Product very abrasive
Fit hardened lobe hubs
•
•
•
•
•
Worn bearings
Replace the bearings, check the pump
•
Worn or damaged mechanical seal
Replace the seal
•
O-rings not the right ones for the liquid
Fit the proper O-rings. Check with the supplier
•
•
•
Worn gears
Replace and readjust the gears
•
•
•
•
Insufficient lubricating oil level
Fill up with oil
•
•
•
•
Insufficient lubricating oil level
Use an appropriate oil
•
•
•
•
The lobes rub
Reduce the speed
Reduce the discharge pressure
Adjust the play
•
•
•
•
Coupling misalignment
Align the coupling, see chapter 5.5 Coupling
•
•
•
•
Tension on the pipelines
Connect the pipelines free of tensions to the
pump
•
•
•
•
Foreign bodies in the liquid
Insert a filter in the suction pipe
•
Mechanical seal spring tension too low
Adjust as indicated in this manual
•
•
•
•
Pump and/or electric motor not fixed on
foundation
Tighten, check that the piping has been
connected stress-free and align the coupling

Maintenance
INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12 19
8. Maintenance
8.1. GENERAL CONSIDERATIONS
This pump, just like any other machine, requires maintenance. The instructions contained in this manual cover
the identification and replacement of spare parts. The instructions are aimed at maintenance personnel and
those responsible for the supply of spare parts.
Carefully read chapter 9. Technical Specifications.
Maintenance work can only be carried out by qualified personnel that are trained and equipped
with the necessary resources to carrying out this work.
All parts or materials that are replaced must be properly disposed of/recycled in accordance with
the current directives applicable in each area.
ALWAYS disconnect the pump before beginning any maintenance work.
Tightening torque:
Size
Nm
lbf·ft
M6
10
7
M8
21
16
M10
42
31
M12
74
55
M16
112
83
8.2. CHECK THE MECHANICAL SEAL
Periodically check that there are no leaks around the shaft. If leakage is detected through the mechanical seal,
replace it following the instructions in the section 8.7. Disassembly of the pump and 8.8. Assembly of the pump.
8.3. MAINTENANCE OF THE SEALS
SEALS REPLACEMENT
Preventive maintenance
Replace after twelve (12) months. We also recommend replacing the
gaskets during seal or pump shaft replacement.
Maintenance after a leak
Replace at the end of the process. If the impeller nut gasket fails, the
threaded hole on the impeller nut and the threads on the end shaft have to
be cleaned. Follow the instructions given in 8.6. Cleaning.
Scheduled maintenance
Regularly check that there are no leaks and that the pump is operating
correctly.
Keep a record of the pump.
Use statistics to plan inspections.
Lubrication
During assembly, use soapy water when fitting the different gaskets to
allow them to slide better.

Maintenance
20 INOXPA S.A.U. 01.500.30.03EN · (0) 2019/12
8.4. OILING
The bearings are oiled by immersion in an oil bath.
The pumps are supplied with oil.
•Regularly check the oil level, for example, weekly or every 150 operating hours.
•The first oil change must be carried out after 150 hours of operation.
•Afterwards, it can be changed every 2500 operating hours or at least once a year when operating under
normal conditions.
Do not fill with oil the bearing support above the level
Leave the pump switched off for a while and then re-check the oil level. If necessary, add a little oil.
Pump size
Quantity of oil in the support (l)
Horizontal
connections
(standard)
Vertical
connections
SLR 0
0,30
0,25
SLR 1
0,50
0,40
SLR 2
0,75
0,50
SLR 3
1,75
1,40
SLR 4
4,50
3,40
SLR 5
15,0
11,5
8.5. STORAGE
Before being stored the pump must be completely emptied of liquids. Avoid, as far as possible, the exposure of
the parts to excessively damp atmospheres.
8.6. CLEANING
COP (clean-out-of-place) cleaning
The use of aggressive cleaning products such as caustic soda and nitric acid may give raise to skin
burns.
Use rubber gloves during the cleaning process.
Always use protective during the cleaning process.
1. Dismantle all parts.
2. Pre-rinse with warm water (110ºF) until the rinsed surface look clean.
3. Submerge and soak all parts for 5 minutes in COP tank with 2% caustic wash (120ºF to 145ºF).
4. Brush-clean the threads to the lobe screws, O-ring housings, shafts spline, and threaded hole of the
shaft.
5. Rinse with clear water.
6. Swab test the inside of the tapped hole to determine cleanliness.
7. Should the swab test fail, repeat steps 2 to 6 above until the swab test is passed.
8. Should swab testing continue to fail, or time is on the essence, install a new (spare) air shaft.
9. Immerse items in sanitizer before reassembling and/or brush-sanitize connections.
If the drive screw gasket (80) or sleeve seal gasket (80B) is damaged, the threads of the shafts (05 and 05A)
and the screws (25) must be cleaned. It is recommended:
1. Remove the screws (25), washers (35) and lobes (02) according to the instructions given in section
8.7.2. Disassembly the lobes.