INOXPA SLRT 3-90 Manual

INSTALLATION, SERVICE AND
MAINTENANCE INSTRUCTIONS
SLR-T
INOXPA, S.A.
c/Telers, 54 Aptdo. 174
E-17820 Banyoles
Girona (Spain)
Tel.: (34) 972 - 57 52 00
Fax. : (34) 972 - 57 55 02
Email: [e-mail]
www.inoxpa.com
Original Manual
01.506.30.0001EN
2021/11
01.506.32.0001
(A)

4 1.Safety 2021/11
1. Safety
1.1. INSTRUCTION MANUAL
This manual contains information regarding the reception, installation, operation, assembly, disassembly and maintenance of
the SLR-T pump.
The information published in this instruction manual is based on updated data.
INOXPA reserves the right to modify this instruction manual without prior notice.
1.2. INSTRUCTIONS FOR START-UP
This instruction manual contains essential and useful information for properly starting the pump and maintaining it in good
operating condition.
Prior to starting the pump, personnel and operators must carefully read the safety instructions detailed in this section and must
familiarise themselves with the operating characteristics of the pump; also, personnel and operators must strictly follow the
instructions provided. It is of vital importance that these instructions be kept at a safe location near the installation area.
1.3. SAFETY
1.3.1. Warning symbols
Danger for people in general
Risk of injury caused by rotating machine
parts
Electrical hazard
Danger! Caustic or corrosive agents
Danger! Suspended loads
Danger to the correct operation of the
machine
A safe working environment must be
ensured at all times
The use of safety goggles is mandatory
1.4. GENERAL SAFETY INSTRUCTIONS
Read this instruction manual carefully before installing and starting the pump. Contact INOXPA if
you have any doubts or queries.
1.4.1. During the installation
The Technical Specifications in Chapter 8 must always be observed.
Do not operate the pump before connecting it to the pipework.
Do not operate the pump unless the pump body has been fitted and adjusted and the pump rotors
have been secured.
Check for correct specifications of the motor, especially if its working conditions create an explosion
hazard.
During the installation, all electrical work must be carried out by authorised personnel.
1.4.2. During operation
The Technical Specifications in Chapter 8 must always be observed. Under no circumstances can the
specified limits be exceeded.
NEVER touch the pump or the pipework during operation if the pump is being used for transferring
hot liquids or during cleaning.

2021/11 1.Safety 5
The pump contains moving parts. NEVER place your fingers inside the pump during operation.
NEVER operate the pump with the suction and discharge valves closed.
NEVER spray water directly on the electric motor. The standard motor protection is IP-55:
protection against dust and water spray.
1.4.3. During maintenance
The Technical Specifications in Chapter 8 should always be observed.
NEVER disassemble or remove the pump until the pipes have been emptied. Remember that liquid
will always remain inside the pump’s body (if it does not have a purge). Bear in mind that the liquid
being pumped 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.
ALWAYS disconnect the electrical power to the pump prior to carrying out any maintenance work.
Remove the fuses and disconnect the cables from the motor terminals.
All electrical work must be carried out by authorised personnel.
1.4.4. Compliance with the instructions
Any failure to comply with the instructions may impose a risk to the operators, the environmental conditions in the room and
the machine, and may ultimately result in the loss of any right to claim damages.
This non-compliance may result in the following risks:
•Major malfunction of the machine/plant.
•Non-compliance with specific maintenance and repair procedures.
•Possible electrical, mechanical and chemical hazards.
•The environmental conditions in the room may impose a hazard due to the substances being released.
1.4.5. Warranty
We wish to emphasise that any warranty will be void immediately and lawfully; INOXPA shall be compensated for any civil
liability claims submitted by third parties in the following cases:
•The operation and maintenance work has not been carried out in accordance with the corresponding service
instructions; the repairs have not been carried out by INOXPA personnel or they 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 INOXPA genuine parts/lubricants;
•The material or equipment has been improperly used due to errors or negligence, or has not been used according
to the instructions and its intended purpose.
•The pump parts have been damaged by high pressure due to the absence of a safety or relief valve.
The supplied General Conditions of Delivery also apply.
The machine may not undergo any modification without prior approval from the manufacturer. For
your safety, use only original spare parts and accessories. The usage of other parts will relieve the
manufacturer of any liability.
Any change in the operating conditions is only possible with the prior written consent of INOXPA.
Do not hesitate to contact us if you have any questions or if you require further explanations regarding specific
aspects relating to this machine (adjustments, assembly, disassembly, etc.).

6 2.Table of contents 2021/11
2. Table of contents
1. Safety 4
1.1. Instruction manual ........................................................................................................ 4
1.2. Instructions for start-up................................................................................................. 4
1.3. Safety .......................................................................................................................... 4
1.4. General safety instructions............................................................................................. 4
2. Table of contents 6
3. General information 7
3.1. Description ................................................................................................................... 7
3.2. Principle of operation..................................................................................................... 7
3.3. Application ................................................................................................................... 7
4. Installation 8
4.1. Reception of the pump .................................................................................................. 8
4.2. Handling and storage .................................................................................................... 8
4.3. Location ....................................................................................................................... 9
4.4. Coupling....................................................................................................................... 9
4.5. Pipes...........................................................................................................................10
4.6. Auxiliary line................................................................................................................11
4.7. Relief valve (pressure bypass) .......................................................................................11
4.8. Electrical installation.....................................................................................................12
5. Starting the pump 13
5.1. Starting the pump ........................................................................................................13
5.2. Pressure bypass...........................................................................................................14
6. Operating problems 15
7. Maintenance 16
7.1. General considerations .................................................................................................16
7.2. Storage .......................................................................................................................16
7.3. Cleaning......................................................................................................................17
7.4. Disassembly of the pump..............................................................................................18
7.5. Assembly of the pump ..................................................................................................20
7.6. Disassembly / assembly of the mechanical seal...............................................................22
7.7. Adjusting and synchronising the lobes............................................................................22
8. Technical Specifications 24
8.1. Technical specifications.................................................................................................24
8.2. Noise level...................................................................................................................25
8.3. SLR-T parts breakdown ................................................................................................26
8.4. SLR-T parts list ............................................................................................................27
8.5. Pump safety valve........................................................................................................28
8.6. Front heating jacket .....................................................................................................29
8.7. Rear heating jacket ......................................................................................................29
8.8. Double lip seal .............................................................................................................30

2021/11 3.General information 7
3. General information
3.1. DESCRIPTION
INOXPA's SLR-T lobe rotor pumps are part of our extensive range of positive displacement rotary pumps for viscous liquids.
Thanks to the wider lobes of the SLR-T pump, it delivers a higher flow rate, appropriate for pressures of up to 7 bar.
The SLR-T model has been especially developed to respond to all hygiene requirements of the food processing industry.
With regard to hygiene, reliability and robustness, the entire range of lobe rotor pumps satisfies all the requirements of the
aforementioned industry.
Thanks to its modular design, there is an optimal interchangeability of parts between the different pumps.
This unit is approved for use in food processing applications.
3.2. PRINCIPLE OF OPERATION
The lobe rotor pump is a positive displacement rotary pump. The upper lobe is driven by the drive shaft. The lower lobe is
located on the driven shaft and is driven through a helical gear. Both lobes rotate synchronously inside the pump casing without
touching each other. During operation of the pump, a fixed amount of liquid is displaced and conveyed to the discharge nozzle.
The following figure shows how a lobe rotor pump operates.
A B C
A: As the lobes rotate, the space on the suction side increases when one lobe separates from the other, generating a partial
vacuum which pushes the liquid into the pumping chamber.
B: Driven by the rotating shafts, each lobe is successively filled with liquid, which is conveyed towards the discharge side. The
gaps between the lobes and between the lobes and the pump walls are small enough to maintain the spaces sealed.
C: The pump body is completely filled and liquid escapes through the meshing of the lobes, pushing against the walls of the
spaces, thus completing the pumping action.
NOISE
Lobe rotor pumps are rotary displacement pumps. Owing to the contact between internal parts, variations in pressure, etc.,
these pumps are louder than centrifugal pumps.
This noise originating from the operation and installation must be considered.
3.3. APPLICATION
The SLR-T lobe rotor pump is capable of pumping a wide variety of fluids, with viscosities ranging from 1 mPa.s to 100,000
mPa.s.
It can pump delicate liquids and liquids containing soft solids with minimum degradation.
It also has a built-in flange to facilitate connection to a hydraulic motor, which enables it to be mounted on a lorry.
Appropriate personal protective equipment must be used if the sound pressure level in the work area
exceeds 80 dB(A).
Each type of pump is designed for a specific field of application. Your pump was selected to meet
specific pumping conditions at the time it was ordered. INOXPA shall not be liable for any damage
that may occur if the information provided by the buyer is incomplete (specifications of the fluid to
be pumped, RPM, etc.).
01.506.32.0002

8 4.Installation 2021/11
4. Installation
4.1. RECEPTION OF THE PUMP
INOXPA is not liable for any deterioration of the material caused by its transport or unpacking.
Visually check that the packaging has not been damaged.
The following documentation is included with the pump:
•Shipping documents
•Instructions and Servicing manual for the pump
•Instructions and Servicing manual for the motor (*)
(*) If INOXPA has supplied the pump with a motor.
Unpack the pump and check the following:
•The pump's suction and discharge connections.
•Remove any packaging material and check that the pump and
motor have not suffered any damage.
•If found not to be in good material condition and/or if not all the
parts are included, the shipping carrier should submit a report as
soon as possible.
4.1.1. Identification of the pump
MODEL Nº
kW
YEAR
-1
min V
Qm /h Hm
Hz
3
17820 BANYOLES · GIRONA (SPAIN)
www.inoxpa.com
INOXPA S.A.
Name plate of the pump
4.2. HANDLING AND STORAGE
The SLR-T pumps are usually too heavy to be stored manually. Use an adequate means of transport.
Use the points indicated in the diagram for lifting the pump.
The pump should only be transported by authorised personnel.
Do not work or walk underneath heavy loads.
Lift the pump as indicated below:
•Always use two supporting points
placed as far away from each other
as possible.
•Secure the points in a manner that
prevents them from sliding or
moving.
Serial number
01.506.32.0003
01.506.32.0005
01.506.32.0004

2021/11 4.Installation 9
4.3. LOCATION
•Place the pump as close as possible to the suction tank and, if possible, below the liquid level.
•Place the pump in a position that allows enough space around it to provide access to the pump as well as to the motor.
•Place the pump on a flat and level surface.
•The base must be rigid, horizontal and protected against vibrations.
Install the pump in a manner that it can be properly ventilated. If the pump is installed outside, it
must be sheltered under a roof. Its location must allow for easy access during any required
inspection or maintenance task.
4.3.1. Foundation
The foundation for the pump should be built in such a way that the drive and the pump are level and well supported. The pump
unit must thus be installed on a baseplate - in accordance with DIN 24259 - or on a frame, both placed on the foundation. The
foundation must be strong, level and flat, without any vibrations, in order to prevent distortion (to maintain the alignment of
the pump - correct operation is guaranteed during start-up).
To install the pump unit on the foundation proceed in the following way:
•Drill holes in the foundation to adjust the foundation bolts. This is not necessary if wedge anchors are used instead of
foundation bolts.
•Place the baseplate or frame horizontally on the foundation (use spacers if required).
•Grout.
•Once the grout has hardened completely, the pump unit can be installed on the baseplate or frame. Carefully tighten the nuts
on the foundation bolts.
For other types of foundations, consult INOXPA.
4.4. COUPLING
For selecting and installing couplings, please consult the supplier manual. On occasions, the starting torque of a positive
displacement pump can be quite high. Therefore, a coupling with a torque capacity 1.5 to 2 times larger than the recommended
torque should be selected.
4.4.1. Alignment
The pump and motor shaft of the pump unit has been accurately pre-aligned in our factory.
After installing the pump unit, the pump and motor shaft must be re-aligned.
•Once the installation of the pump unit has been completed, check the alignment of the pump and motor shaft again. If
necessary, re-align.
•In the case of high-temperature applications, the pump can be started and operated at its working temperature for a short
period of time. Afterwards, re-check the pump-pipe alignment.
Place a straight-edge ruler (A) on the coupling: the ruler should make contact with both halves of the coupling along its entire
length. Refer to the illustration below.
Repeat the procedure, but this time on both sides of the coupling close to the shaft. For increased accuracy, this check can
also be carried out using an external gauge on two diametrically opposed points on the exterior surfaces of the two halves of
the coupling.
Maximum alignment deviation:
Outer diameter of
the coupling [mm]
S max
[mm]
∆Kw [mm]
∆Kr [mm]
L [mm]
129
5
2.2
0.30
125
140
5
2.4
0.35
135
182
5
3
0.40
175
01.506.32.0006
∆Kw=S max - S min [mm]

10 4.Installation 2021/11
4.5. PIPEWORK
•In general, suction and discharge pipes must be installed in straight sections, with the minimum number of elbows and
fittings, in order to reduce wherever possible 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 pipe
connections.
•Place the pump as close as possible to the suction tank, if possible below the liquid level, or even below the tank, in order to
achieve the largest possible static head for suction.
•Place the pipe support brackets as close as possible to the pump's suction and discharge ports.
4.5.1. Shut-off valves
It is possible to isolate the pump to carry out maintenance work. 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 when the pump is operating.
4.5.2. Self-priming process
In general terms, if the self-priming process is followed, the pump must contain sufficient liquid to fill all internal recesses and
voids, allowing the pump to generate a difference in pressure.
However, if low viscosity fluids are being pumped, a foot valve of the same or greater diameter than that of the suction pipe
must be installed; as an alternative, a "U" shaped pipe may be installed.
The use of a foot valve is not recommended for pumping viscous liquids.
•To eliminate air and gases from the suction line, the backpressure inside the discharge line must be reduced. When using
the self-priming process, the pump must be started by opening and closing the discharge line, which allows the air and
gases to escape with a reduced backpressure.
•Another option involves the use of long pipes or the installation of a check valve in the discharge line; it is also possible to
install a bypass with a shut-off valve on the discharge side of the pump. This valve must be opened for priming, which
allows air and gases to escape with a minimum backpressure.
•The bypass must not return to the suction port, it should go to the supply tank instead.
01.505.32.0007

2021/11 4.Installation 11
4.6. AUXILIARY LINE
4.6.1. Heating/cooling jackets
The heating/cooling jacket (S) is located at the front of the pump cover. There is also an option to fit a jacket in the area of the
mechanical seal. Heating or cooling media can be connected as shown in the figure below.
4.7. RELIEF VALVE (PRESSURE BYPASS)
Positive displacement lobe rotor pumps must be protected from excessive pressure when they are in
operation. Therefore, all SLR pumps can be fitted with a stainless steel pressure relief valve or with a
pressure bypass on the pump body cover.
4.7.1. Protection
This valve protects the pump and prevents excessive pressure from building up in the circuit. It reduces the differential pressure
(p) between the suction and discharge lines, but not the maximum pressure in the system.
Do not use the relief valve to protect the system against excess pressure. This valve is designed to
protect only the pump; it is not a safety valve.
4.7.2. Principle of operation
The pressure relief valve or bypass prevents the build-up of excessive pressure inside the pump. For example, when the
discharge port on the pump is blocked and liquid cannot be pumped, excessive pressure can cause serious damage to some
parts of the pump. The bypass opens a passage from the discharge side to the suction side of the pump: an escape route which
directs the flow back to the suction side when the pressure in the system exceeds a specific threshold level.
If the relief valve is not working properly, the system will not operate correctly. The pump must
be disconnected immediately. Identify the problem and resolve it before starting the pump again.
Remember that the relief valve cannot be used to regulate the pump flow.
The relief valve can be adjusted to any specific pressure, depending on the type of pump being used.
01.505.32.0008

12 4.Installation 2021/11
4.8. ELECTRICAL INSTALLATION
Only allow qualified personnel to connect the electric motors. Take the necessary precautions to
prevent damage to cables and connections.
The electrical equipment as well as the terminals and control system components can remain
electrically charged even when they are disconnected. Touching them may be dangerous for
operators or cause irreversible damage to equipment.
Prior to handling the valve, ensure the motor is stopped.
•Connect the motor in accordance with the instructions supplied by the motor manufacturer.
•Verify the direction of rotation (refer to the label on the pump).
•Run the pump motor for a short period of time. Ensure that the pumping direction is correct. Running the pump in
the wrong direction may cause serious damage.
ALWAYS verify the direction of the pump with liquid inside the pump.
01.506.32.0009

2021/11 5.Starting the pump 13
5. Starting the pump
Prior to starting the pump, carefully read and follow the installation instructions given in Chapter 4
Installation.
5.1. STARTING THE PUMP
Carefully read Chapter 8 Technical specifications. INOXPA is not liable for inappropriate use of the
equipment.
Do not touch the pump or the pipework while hot products are being pumped.
5.1.1. Inspections that must be carried out prior to starting the pump
•Fully open the shut-off valves on the suction and discharge pipes.
•Check the oil level in the pump. Add oil to the pump until the oil level reaches the half mark on the sight glass and stays
there (in case of starting the pump for the first time: the pumps are shipped with oil in the bearing support. However, this
check must always be performed).
•If liquid does not flow into the pump, fill it with the liquid to be pumped.
The pump shall NEVER operate without any liquid inside.
•Check that the electrical power supply matches the rating indicated on the motor plate.
•Check for proper direction of rotation of the motor.
•If the pump has a heating jacket, install the corresponding ancillary connection with the specifications indicated in Chapter 8,
Technical specification.
5.1.2. Inspections that must be carried out when starting the pump
•Check that the pump is not making any strange noises.
•Check that the absolute inlet pressure is sufficient to prevent cavitation inside the pump. Refer to the curve for the minimum
pressure required above the vapour pressure (NPIPr).
•Control the discharge pressure.
•Check that there are no leaks through the sealed areas.
The shutoff valve must not be used to regulate the flow in the suction line. It must be completely
open during operation.
Control the power consumption of the motor to prevent an electrical overload.
If required, decrease the flow and the power consumed by the motor by decreasing the motor speed.

14 5.Starting the pump 2021/11
5.2. 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 safety valve.
When the pump incorporates a safety 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.
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).
•In the SLR-T pump, the spring can be adjusted to set the bypass valve pressure between 2 and 7 bar.
When checking the safety valve, make sure that the pump pressure NEVER exceeds the set pressure +2
bar.
If the safety 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.
01.506.32.0010

2021/11 6.Operating problems 15
6. Operating problems
The following table provides solutions to problems that may appear during normal pumping operations. It is assumed that the
pump has been installed properly and that it has been correctly selected for the relevant application.
Please contact INOXPA if you require technical assistance.
Operating problems
Probable causes
Motor overload
8, 9, 12, 16, 20, 21, 22, 23, 24, 26.
The pump flow or pressure is too low
2, 4, 5, 7, 8, 9, 10, 11, 13, 14.
There is no pressure on the discharge side
1, 2, 3, 6, 7.
Irregular discharge flow rate / pressure
2, 4, 5, 6, 9, 12.
Noise and vibrations
2, 4, 5, 6, 7, 8, 9, 11, 12, 13, 16, 19, 20, 21, 22, 23, 24, 25, 26.
The pump gets clogged
8, 9, 11, 16, 19, 20, 21, 22, 24, 25, 26.
Pump overheated
7, 8, 9, 11, 12, 16, 20, 21, 22, 23, 24, 26.
Abnormal wear
4, 5, 11, 15, 16, 19, 24, 25.
The mechanical seal leaks
17, 18.
Probable causes
Solutions
1
Wrong direction of rotation
Reverse the direction of rotation
2
Insufficient NPIP
Increase the NPIP:
•Raise the suction tank
•Lower the pump
•Reduce the speed
•Increase the diameter of the suction pipe
•Shorten and simplify the suction line
3
The pump is not purged
Purge or fill with product
4
Cavitation
Increase the suction pressure (refer to section 2)
5
The pump sucks in air
Inspect the suction line and all of its connections
6
Suction pipe obstructed
Check the suction line and the filter/s, if applicable
7
Incorrect bypass valve setting
Verify the setting of the relief valve or bypass
8
Discharge pressure is too high
If required, reduce the pressure loss by increasing the diameter of
the discharge pipe
9
The viscosity of the liquid is too high
•Reduce the pump speed
•Reduce the viscosity; for example, by heating the liquid
10
The viscosity of the liquid is too low
•Increase the pump speed
•Increase the viscosity; for example, by cooling the liquid
11
The temperature of the liquid is too high
Reduce the temperature by cooling the liquid
12
The pump speed is too high
Reduce the pump speed
13
The lobes are worn
Replace the lobes
14
The pump speed is too low
Increase the pump speed
15
The product is highly abrasive
Install hardened lobes
16
The bearings are worn
Replace the bearings, check the pump
17
The mechanical seal is worn or damaged
Replace the seal
18
The gaskets are not suitable for the liquid
Install the correct gaskets; consult with the supplier
19
The gears are worn
Replace and re-adjust the gears
20
The lubricating oil level is too low
Fill with oil
21
Improper lubricating oil
Use a suitable type of oil
22
Friction in the lobes
•Reduce the pump speed
•Reduce the discharge pressure
•Adjust the play
23
Misaligned coupling
Align the coupling
24
Tension in the pipework
Connect the pipes to the pump without tension
25
Foreign matter in the liquid
Install a filter in the suction line
26
The pump and/or the electric motor is not secured
to the baseplate / foundation
Tighten, check that the pipes are connected
to the pump without tension and align the coupling
If the problem persists, stop the pump immediately. Contact the pump manufacturers or
representatives.

16 7.Maintenance 2021/11
7. Maintenance
7.1. GENERAL CONSIDERATIONS
Just like any other machine, this pump requires maintenance. The instructions in this manual cover the identification and
replacement of spare parts. These instructions have been prepared by the maintenance personnel and are aimed at those
responsible for the supply of spare parts.
Carefully read Chapter 8 Technical specifications .
All parts or materials that are replaced must be properly disposed of / recycled in accordance with
the directives in force in each area.
ALWAYS disconnect the pump before beginning any maintenance work.
7.1.1. Check the seal gaskets
Periodically check that there are no leaks around the shaft. If the seal gaskets leak, replace the gaskets in accordance with the
instructions provided in Section 7.6 Disassembly / assembly of the mechanical seal.
7.1.2. Tightening torque
Material
Tightening torque [Nm]
M5
M6
M8
M10
M12
M14
M16
M18
M20
8.8
6
10
25
49
86
135
210
290
410
A2
5
9
21
42
74
112
160
210
300
7.1.3. Lubrication
The bearings are lubricated by immersion in an oil bath.
The pumps are supplied with oil.
•Periodically check the oil level; for example, weekly or every 150 hours of operation.
•The first oil change must be carried out after 150 hours or operation.
•Afterwards, it may be changed every 2,500 hours of operation or at least once a year under normal operating conditions.
When changing the oil: the sump must be filled to the half mark on the sight glass.
Do not fill the bearing support with oil above that level.
Stop the pump for a moment and then re-check the oil level; if required, add a little oil.
•The oil capacity of the SLR-T pump is 1.5 litres.
•Oils for temperatures between 5 and 50 ºC: SAE 90 or ISO VG 220.
7.2. STORAGE
Before storing the pump it should be completely drained. Where possible, avoid exposing the parts to excessively humid
environments.

2021/11 7.Maintenance 17
7.3. CLEANING
7.3.1. Manual cleaning
The use of aggressive cleaning products such as caustic soda and nitric acid can burn the skin.
Use rubber gloves during the cleaning process.
Always wear protective goggles.
7.3.2. Automatic CIP (Cleaning In Place)
If the pump is installed in a system with CIP, dismantling of the pump is not required.
The minimum recommended liquid speed for an effective cleaning process is 1.8 m/s (minimum Reynolds number > 100 000 at
1.0~2.5 bar).
If an automatic cleaning system is not available, disassemble the pump in accordance with the instructions supplied in the
section "Disassembly and assembly of the pump".
Cleaning solutions for CIP processes.
Only use clear water (chlorine free) for mixing with the following cleaning agents:
a) Alkaline solution: 1% by weight of caustic soda (NaOH) at 70ºC (150ºF)
1 kg NaOH + 100 litres of water = cleaning solution
or
2.2 litres 33% NaOH + 100 litres of water = cleaning solution
b) Acid solution: 0.5% by weight of nitric acid (HNO3) at 70ºC (150ºF)
0.7 litres of 53% HNO3+ 100 litres of water = cleaning solution
Check the concentration of the cleaning solutions; incorrect concentrations may lead to
deterioration of the pump seals.
To remove any traces of cleaning products, ALWAYS perform a final rinse with clean water at the end of the cleaning process.
7.3.3. Automatic SIP (Sterilisation In Place)
Steam sterilisation is applied to all equipment including the pump.
Do not start the pump during the steam sterilisation process.
The parts/materials will not suffer any damage if the instructions in this manual are followed.
Make sure that no cold liquid enters the system until the temperature of the pump has cooled down
to at least 60°C (140°F).
The pump generates an important pressure loss through the sterilisation process. We recommend
the use of a bypass circuit with a discharge valve to ensure that steam / superheated water
sterilises the entire circuit.
Maximum conditions during the SIP process with steam or superheated water
a) Maximum temperature: 140°C / 284°F
b) Maximum time: 30 min
c) Cooling: Sterile air or inert gas
d) Materials: EPDM / PTFE (recommended)
FPM / NBR / (not recommended)

18 7.Maintenance 2021/11
7.4. DISASSEMBLY OF THE PUMP
Assembly and disassembly of the pump should only be performed by qualified personnel. Make sure that the personnel carefully
reads this instruction manual and, in particular, the instructions concerning the work to be carried out.
Incorrect assembly or disassembly may cause the pump to malfunction and lead to high repair costs
and a long down-time period.
INOXPA will not be liable for accidents or damage caused by failure to observe the instructions
contained in this manual.
Preparations
Provide for a clean working environment since some parts, including the mechanical seal, may need to be handled carefully and
others have small tolerances.
Check that the parts being used have not been damaged during transport. When doing this, you need to inspect the fitting
edge, the matching faces, seals, check for burrs, etc.
After every disassembly, clean the parts thoroughly and check for any damage. Replace all damaged parts.
Tools
Use the adequate tools for carrying out the assembly and disassembly operations. Use the tools properly.
Cleaning
Prior to disassembling the pump, clean the exterior and interior of the pump.
NEVER clean the pump by hand while it is operating
7.4.1. Removal of the pump cover
CAUTION! Liquid from inside the pump may spill out when the pump cover is removed
•Close the suction and discharge valves.
•Remove the cap nuts (45).
•Remove the pump cover (03).
•Check that the gasket (80A) is in good condition.
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2021/11 7.Maintenance 19
7.4.2. Disassembly of the lobes
•Loosen the lobe screws (25) with a key (this key can be ordered from
INOXPA).
•These screws have a right-hand thread. To prevent the lobes from
turning simultaneously, the extraction tool handle can be used (this
tool can be ordered from INOXPA).
•Check that the O-rings (80) are in good condition.
•Remove the impeller washers (35).
•Remove both lobes (02) using the extraction tool by placing it on the
grooves machined in the lobes for this purpose and tighten the nut, if
necessary, with a 19 mm spanner.
•Remove the spacer washers (32) fitted on each shaft. If more than
one washer is installed on each shaft, keep them separated to
prevent them from getting mixed up.
7.4.3. Removal of the mechanical seal cover
•Loosen the nuts (57) securing each seal cover (09). Make sure that
these nuts are not completely removed from the stud.
•Press nuts (57) so that the seal covers (09) are loosened. If
necessary, use a tool to achieve this.
•The seal covers (09) can be withdrawn once the nuts (57) have been
removed. The stationary part (08A) of the mechanical seal remains
housed in the seal cover. To remove the rotating part (08) which
remains mounted on the shaft, unscrew the studs from the rotating
part and remove it. Refer to Chapter 7.6. Disassembly / assembly of
the mechanical seal
7.4.4. Disassembly of the body
•Loosen and remove the nuts (54) that fasten the pump body (01) to
the bearing support (06).
•The body has two M10 through holes to facilitate the extraction (S).
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20 7.Maintenance 2021/11
7.4.5. Draining the lubricating oil
•Place a container under the pump feet (07) to collect the lubricating oil
so that it can be recycled.
•Remove the drain plug (87) located on the rear side of the pump feet
(07).
7.4.6. Disassembly of the shaft assembly
•Loosen and remove the screws (51A).
•Removal of the bearing cover (12) is a little complicated because the
cover was mounted with a seal tool. For this reason, it has two
notches to facilitate its removal.
•Check the condition of the bearing cover seal (18). If any defect is
found, look for a replacement part before assembling the pump.
7.5. ASSEMBLY OF THE PUMP
7.5.1. Assembly of the shaft assembly
•Check that the bearing cover seal (18) is not damaged and fit it in the
correct position on the bearing cover (12) using a seal tool.
•Install the bearing cover (12) and fasten it with screws (51A).
7.5.2. Filling with lubricating oil
•Remove the oil cap (85) located on top side of the bearing support
(06).
•Fill the bearing support (06) with lubricating oil to the half mark on
the sight glass (86).
Refer to 7.1.3 Lubrication for the type and quantity of oil to be used.
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