AxFlow Aturia NA Series Manual

Single Stage
Mechanically Coupled
End Suction
Centrifugal Pump
built to DIN 25255
standard
NA SERIES
OPERATION
&
MAINTENANCE
MANUAL

IMPORTANT NOTES
NA Series Operating & Instruction Manual Page i
Read these instructions before putting the pump into service.
Installation and operation should be carried out by qualified personnel only.
Danger of electrocution. Electric supply must be isolated before working on the pumpset.
Electrical work should only be carried out by qualified personnel

CONTENTS
NA Series Operating & Instruction Manual Page ii
GENERAL.................................................................................................................................................1
Precautions during operation...............................................................................................................1
Noise levels ..........................................................................................................................................1
Operating limits ...................................................................................................................................2
Residual risks........................................................................................................................................3
In case of emergency............................................................................................................................3
Area of operation .................................................................................................................................4
Spare parts...........................................................................................................................................4
Transport .............................................................................................................................................5
Storage ................................................................................................................................................6
Storage for a period shorter than 3 months......................................................................................6
Storage for a period exceeding 3 months (but shorter than 12 months)...........................................6
Storage (after operation)..................................................................................................................6
Drivers..................................................................................................................................................7
INSTALLATION........................................................................................................................................8
Foundations .........................................................................................................................................8
Motor-pump units on baseplates......................................................................................................8
Pump and motor alignment .................................................................................................................9
Methods of checking alignment.........................................................................................................10
Straight edge..................................................................................................................................10
Dial gauge ("clocking") ................................................................................................................... 11
Optical methods............................................................................................................................. 11
Location and piping............................................................................................................................ 11
Admissible external forces and torques on pump flanges ..................................................................14
Protecting the pump against dry running...........................................................................................15
Loss of liquid supply .......................................................................................................................15
Low inlet pressure .......................................................................................................................... 15
`Dead-heading'...............................................................................................................................15
Electronic dry running protection.......................................................................................................15
Electrical connection..........................................................................................................................16
Connecting the electric motor........................................................................................................16
Oil lubricated...................................................................................................................................... 17
Bearings ......................................................................................................................................... 17
Oil type........................................................................................................................................... 17
Direction of rotation...........................................................................................................................18
OPERATION ..........................................................................................................................................19
Supervision ........................................................................................................................................19
Priming the pump ..............................................................................................................................19
Start-up..............................................................................................................................................20
Pump operation .................................................................................................................................20

CONTENTS
NA Series Operating & Instruction Manual Page iii
MAINTENANCE .....................................................................................................................................22
Supply isolation..................................................................................................................................22
Maintenance schedule .......................................................................................................................22
Gland packing ....................................................................................................................................23
Mechanical seal..................................................................................................................................23
Bearings .............................................................................................................................................23
Grease lubricated ...........................................................................................................................23
Oil lubricated..................................................................................................................................24
Oil type...............................................................................................................................................24
Pump stop for long period..................................................................................................................24
DISASSEMBLY.......................................................................................................................................25
Disassembling the pump....................................................................................................................25
Complete pump disassembling ..........................................................................................................25
Partial pump disassembling ...............................................................................................................25
Support and rotor disassembling .......................................................................................................26
Gland packing inspection ...................................................................................................................26
Mechanical seal inspection.................................................................................................................26
Bearings inspection............................................................................................................................26
REASSEMBLY ....................................................................................................................................27
Before reassembling ..........................................................................................................................27
Reassembling the pump.....................................................................................................................27
Gland packing reassembling ..............................................................................................................27
Mechanical seal reassembling............................................................................................................28
Pump reassembly...............................................................................................................................28
TYPICAL CROSS-SECTION....................................................................................................................29
TROUBLESHOOTING ............................................................................................................................32
DECOMMISSIONING AND DISMANTLING ........................................................................................... 37
NOTES ...................................................................................................................................................38

GENERAL
NA Series Operating & Instruction Manual Page 1
ATTENTION !
GENERAL
AxFlow Aturia NA series pumps are single stage mechanically coupled end suction pumps. Details of
the pump type and model, serial number and operating data are indicated on the pump nameplate.
The pump must be installed and operated in full compliance with these instructions. The pump may not
be operated outside the limits specified on the nameplate and within this manual. The pump should
only be operated by skilled trained personnel. The manufacturer will not accept liability if these
instructions are not followed.
This manual does not take into account any specific local regulations or bylaws that may be applicable,
and it is the responsibility of the installer to ensure compliance with such regulations.
Precautions during operation
Always take the following safety precautions :
The coupling guard must be at its place on the baseplate.
If warm liquids are pumped, protect the pump to prevent contact with warm pump surfaces.
Never put your hands or any kind of object into pump openings where the shaft rotates
(see picture)
Protect motor and all
electric parts according to
current regulations

GENERAL
NA Series Operating & Instruction Manual Page 2
Noise levels
The following table reports the noise level produced by AxFlow Aturia NA series pumps running with in
their operating limits and installed according to the instructions given in this manual (average values
measured in free field at 1 meter from the pump set and elaborated according to ISO standard R1680 –
curve A). The values are referred to groups with AxFlow standard electric motors. For other motors the
table values shall be compared to the actual used motors.
MOTOR
FRAME SIZE
MOTOR SPEED
2 Pole
4 Pole
63
65
65
71
67
65
80
71
65
90
73
67
100
77
69
112
79
70
132
80
71
160
81
72
180M
82
73
180L
82
73
200
83
74
225
84
75
250
85
77
280
86
80
315S
89
83
315M
90
84
355
91
87
400
93
89
Operating limits
The operating limits are the following :
Suction pressure max. 4 bar
Max. operating pressure at delivery max. 10 bar
Pumping liquid temperature max. 130 °C min. –10°C
Performances are described in the technical specification enclosed in the AxFlow order confirmation.

GENERAL
NA Series Operating & Instruction Manual Page 3
DON’T KICK THE PUMP
DON’T DAMAGE THE
PUMP BY MISHANDLING
DON’T PRESSURIZE THE
PUMP BEYOND
RECOMMENDED LIMITS
AVOID DRY RUNNING, OPERATION AT LOWER
CAPACITY THAN ALLOWED OR RUNNING
AGAINST A CLOSED DISCHARGE VALVE
AVOID THERMAL SHOCK
FROM COLD FLUIDS AGAINST
WARM SURFACES
ONLY USE THE PUMP WITH
FLUIDS SPECIFIED IN THE
ORDER DATASHEETS
Residual risks
Inobservance of the safety instructions here reported or improper use of the pump may result in heavy
damage to things and/or injuries to the person.
Always keep to the following directions :
In case of emergency
Switch off line voltage
Warn service personnel responsible of the plant

GENERAL
NA Series Operating & Instruction Manual Page 4
Area of operation
AxFlow Aturia NA series pump sets may be installed within a building or externally. Wherever installed,
protect the pump from frost, snow and flooding.
Care must be taken to ensure that cold weather will not cause the pump or pipes to freeze, and
installers may wish to consider lagging or trace heating.
If supplied, standard electric motors are only suitable for operation in safe areas, free from the danger
of explosive liquids or gases.
Spare parts
Spare parts are available from AxFlow throughout Great Britain. Please quote the pump model and
serial number for all spares enquiries.
The pump user is strongly recommended to carry replacement spares for parts which are wearing items
as follows:
Radial ball bearings
Impeller
Wear ring
Shaft sleeve
Gasket
Mechanical seal or packing , depending on the construction
If an electric motor is supplied as the drive then also include the following:
Pair of motor bearings

GENERAL
NA Series Operating & Instruction Manual Page 5
Transport
Check the nameplate on the pump against the receiving and purchase order documents to be sure that the
correct size of pump and materials of construction have been supplied. If a motor has been supplied, check
that the power, speed, and voltage are correct.
Prior to unpacking, check for physical damage to the packing and the pump unit and notify the forwarding
agent IMMEDIATELY if any damage is found.
Check that the port covers are intact. If not, check whether foreign objects may have found their way into the
pump casing through the ports. Remove the port covers only when you are ready to connect the pipes to the
pump.
When shipped, the pumps are suitable for short-term storage only. If long-term storage is necessary
before the pump will be put into operation, we suggest that you contact your pump supplier for long-
term storage recommendations.
Check for free rotation of the pump. To check long-coupled pumps for free rotation, remove the coupling
guard and rotate the pump and motor shafts at the flexible coupling.

GENERAL
NA Series Operating & Instruction Manual Page 6
Storage
The delivered pump is generally suitable for immediate installation.
Storage for a period shorter than 3 months
Store the pump in a dry and sheltered area.
Check that ambient temperature never falls below 5°C.
It is recommended that the pump shaft is rotated at regular intervals ( every 30 days ): this
prevents damage to the bearings and seizure of the rotating parts.
Storage for a period exceeding 3 months (but shorter than 12 months)
Raise the pump by means of wooden supports.
Open the package, if any, removing the protection from the pump nozzles and clean by
compressed air then carefully dry inside the pump, if necessary.
Protect the pump inside with anti-condensation products and close the flanges so that no
foreign objects can enter the pump.
Cover the pump with a plastic film and put inside some products the prevent water
condensation.
Check protections periodically.
It is recommended that the pump shaft is rotated at regular intervals ( every 30 days ): this
prevents damage to the bearings and seizure of the rotating parts.
Storage (after operation)
In case of long periods after operation, drain the pipes and the pump through the drain hole in
the lower part of the pump casing.
If an electric motor is supplied as the drive, then before putting into service, the motor winding
insulation should be tested. If the reading is below 10 Mega ohms, move to a warm dry place for a few
hours until the motor insulation value rises.