Alfalaval N Series User manual

M/105/0407
Series N
Stainless Steel Positive Displacement Rotary Lobe Pumps
Operating Manual

Operating Manual
Alfa Laval Pumps Ltd
Birch Road, Eastbourne,
East Sussex BN23 6PQ
Tel No : [phone] Fax [phone]
EC DECLARATION OF INCORPORATION
We hereby declare that the following machinery is intended for installation into a machine or
tobeassembledwithothermachinesintoamachine. Itmustnot beput into service until the
machinery into which it is incorporated has been declared in conformity with the provisions of
the Machinery Directive 89/392/EEC, amendments 91/368/EEC, 93/44/EEC, 93/68/EEC.
Machine Description
Type/Size
Serial Number
This machinery has been designed and manufactured in accordance with the following
transposed harmonised European Standards:-
A technical construction file for this machinery is retained at the above address.
Signed Date
Name Position
(Authorised Person)
P. SWEET Quality Manager
Rotary Lobe Pump
EN292 Parts 1 and 2 : 1991 Safety of Machinery - Basic Concepts, general principles
for design.
EN294 : 1992 Safety distances to prevent danger zones being reached by the upper
limbs.
ISO9001: 1994 Quality Management System.
Conforms to Directive 90/128/EEC Plastic Materials and Articles in contact with Foodstuffs

Operating Manual
Alfa Laval Pumps Ltd
Birch Road, Eastbourne,
East Sussex BN23 6PQ
Tel No : [phone] Fax [phone]
EC DECLARATION OF CONFORMITY
We hereby declare that the following machinery conforms to the machinery directive 89/392/
EEC as amended by 91/368/EEC, 93/44/EEC and 93/68/EEC and to the following other
relevantdirectives. Themachineryhas been designed and manufactured in accordance with
the transposed harmonised European standards; European and national standards as listed:
Machine Description
Type/Size Serial Number
Other Applicable Directives
Applicable Standards/Specifications
A technical construction file for this machinery is retained at the above address.
Signed Date
(Authorised Person)
Name Position
Rotary Lobe Pump - Motorised
Electrical Equipment Low Voltage Directive 73/23/EEC
Plastic Materials and Articles in contact with Foodstuffs Directive 90/128/EEC
EN292 Parts 1 and 2 : 1991 Safety of Machinery - Basic concepts, general principles for
design.
EN294:1992Safetydistancesto prevent danger zonesbeing reached by theupper limbs.
EN60204Part1:1993SafetyofMachinery-Electricalequipmentofmachines-specification
for general requirements.
BS5304 : 1988 Code of Practice for Safety of Machinery.
ISO9001 : 1994 Quality Management System.
P. SWEET Quality Manager

Operating Manual
Contents
1.0 General Page No
1.1 Pump Limits Of Application Or Use 1
1.2 Pump Duty Conditions 1
1.3 Noise Levels 1
1.4 Utility Requirements 1
1.5 Safety Precautions 2
1.6 Health And Safety Information 3
2.0 Unpacking, Handling And Storage
2.1 Documents 4
2.2 Unpacking 4
2.3 Handling 4
2.4 Pump Storage 5
3.0 Description Of Pump Or Pump Unit
3.1 General Pump Description 6
3.2 Principle Of Operation 6
3.3 Pump Dimensions 7
3.4 Pump And Pump Unit Weights 8
3.5 Pump Displacement And Capacities 8
4.0 System Design And Installation
4.1 System Design Advice 9
4.2 Pump And Base Foundations 10
4.3 Installation 10
4.4 Pipework 11
5.0 Start Up, Shut Down And Cleaning In Place
5.1 Start Up Checklist 12
5.2 Pump Shut Down Procedure 13
5.3 Direction Of Rotation 13
6.0 Maintenance And Inspection
6.1 Maintenance Schedule 14
6.2 Recommended Spare Parts 15

OperatingManual
Contents
7.0 Disassembly Page No
7.1 BeforeDismantlingThe Pump 16
7.2 DismantlingThePump 17
7.3 FittingNewOil Seals 18
7.4 Automatic Pressure Relief Valve 19
8.0 Product Seals Removal And Fitting
8.1 Packed Gland 20
8.2 SingleMechanicalSeal 21
9.0 Faults, Causes And Remedies 22
10.0Technical Data
10.1 Pump Information Chart 23
10.2 Lubrication 23
11.0Typical Sectional Arrangement 24

OperatingManual
This range of pumps has been designed for
pumpingdifficultorcorrosivefluidsandwiththe
General 1.0
1.1 Pump Limits of Application or Use 1.3 Noise Levels
Dependinguponthepumpingsystemandduty
conditions the pump noise levels may vary.
Thesoundpressurelevelmeasurementstated
is given for typical pumps/pump units at
maximumpressures/speeds.Theresultsbeing
taken on water at ambient temperature:-
Recorded sound pressure level :- 75 dB(A).
Note :- Readings taken in accordance with
ISO3746.
1.4 Utility Requirements
Electrical Supply :-
Thispumpmaybesuppliedbareshaftorcoupled
to a drive unit for which a drive unit/electrical
supply will be required.
requirements of hygienic processes. Typical
areas of application include laboratories, pilot
plants, chemical processing, food processing
electroplating and film processing.
Pressures of up to 7 bar, speeds to 1000rpm
andtemperaturesto100°Ccanbeobtainedon
this range of pumps depending on type/size.
These conditions cannot always be obtained
simultaneously. The model type/size will be
shown on the nameplate positioned on the
pump.
The pump/pump unit will have been selected
for the pump users specific application when
known and the pump serial number will relate
to this.
If the user has not specified the pumping
applicationorneedstochangeit,itisimportant
to confirm that the materials of construction
and product seals are compatible with the
pumping application and that adequate NPSH
is available.
For specific guidelines contact your supplier
quoting:-pumpmodel/size,serialnumberand
system details (e.g. product, pressure, flow
rate).
Wheretheapplicationrequiresthepumpshould
be mounted with ports vertical to ensure self
draining e.g. food media.
1.2 Pump Duty Conditions
The pump should only be used for the duty for
which it has been specified. The operating
pressure, speed and temperature limits have
been selected at the time of order and MUST
NOTbeexceededforthepump. Thesedetails
arestatedontheoriginaldocumentationandif
notavailablemaybeobtainedfromyoursupplier
quoting :- pump model and serial number.
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Operating Manual
Allwarningsinthismanualaresummarisedon
this page.
Pay special attention to the instructions below
sothatseverepersonalinjuryordamagetothe
pump can be avoided.
Personnel performing installation, operation
and maintenance of the pump must have the
relevant experience required.
INSTALLATION
OPERATION
MAINTENANCE
: Always observe the technical data.
:Thepumpmustbeelectricallyconnectedbyauthorisedpersonnel. (Seethemotor
instructions supplied with the drive unit).
: Never start in the wrong direction of rotation with liquid in the pump.
: Never put your hands or fingers inside the port connections
1.5 Safety Requirements Warnings Signs:
General safety instructions are
preceded by this symbol.
Electrical safety instructions are
preceded by this symbol.
Take great care when using caustic
agents.
: Always observe the technical data.
: Never touch the pump or the pipelines when pumping hot liquids.
: Never stand on the pump or pipelines.
: Never run the pump with both the suction side and the pressure side blocked.
: Always handle toxic and acidic liquids with great care.
: Never put your hands or fingers inside the port connections.
: Always observe the technical data.
: Always disconnect the pump from thedriveunitand power supply whenservicing
the pump.
: The pump must never be hot when servicing it.
: The pump and pipelines must never be pressurised when servicing the pump.
: Never put your hands or fingers inside the port connections.
STUDY THIS MANUAL CAREFULLY
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OperatingManual
MATERIAL USE MAJOR HAZARD
SILICON SEALANT GEARBOX SEAL RETAINERS, REAR RELEASES VAPOUR AT ROOM
COVER, GENERAL SEALANT. TEMPERATURE.
SEALANT (RED HERMETITE) GEARBOX SEAL RETAINERS, REAR RELEASES VAPOUR AT ROOM
COVER, GENERAL SEALANT. TEMPERATURE, HIGHLY
FLAMMABLE, TREAT AS FIRE
HAZARD.
ANTI-SEIZE COMPOUNDS BEARINGS APPLIED FROM AEROSOL.
RELEASES VAPOUR. DISPOSE
OF CONTAINER AS IF
PRESSURISED.
ADHESIVES (E.G. PERMABOND) BEARING NUTS, ADJUSTMENT NUTS. RELEASES VAPOUR AT ROOM
TEMPERATURE.
OIL AND GREASE OIL - GENERAL LUBRICATION SKIN AND EYE IRRITANT.
GREASE - PRODUCT SEALS,
TIMING GEARS, GENERAL
LUBRICATION.
PLASTIC COMPOUNDS (PTFE, PTFE - 'O' RINGS, LIP SEALS, RELEASES FUMES WHEN
POLYPROPLYENE, PVC) PACKING. POLYPROPLYENE - GLAND HEATED.
GUARDS. PVC - GLAND GUARDS.
ELASTOMERIC COMPOUNDS ALL - 'O' RINGS, LIP SEALS. NITRILE, RELEASES FUMES WHEN
(EP, VITON, NITRILE, NEOPRENE HEATED.
ARAMID FIBRE GLAND PACKING. EMMITS HARMFUL DUST.
RELEASES FUMES WHEN
HEATED.
PAINT EXTERNAL PUMP SURFACES. RELEASES DUST AND FUMES
IF MACHINED. TREAT AS A
FIRE HAZARD.
Potential Safety Hazards
The following section gives information on
handling, storage and disposal of parts and
materials used in the pumps which may be
considered hazardous to health.
Please pass this information on to your Safety
Officer, he may need it to comply with Health
and Safety, and COSHH regulations.
Electricmotors-thepumpmayhaveanelectric
motor fitted, ensure that the relevant fire
equipment is available.
The information contained here is brief.
General First Aid
If potentially hazardous substances are
accidentally inhaled, or skin or eyes
contaminated, then the following basic
precautions should be taken
Inhalation -Remove to fresh air
Skin -Wash with soap and water
Eyes -Flushwithwater,seekmedical
attention
Inallcases, if symptoms persist, seek medical
attention.
1.6 Health and Safety Information
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Operating Manual
PUMP WITH DRIVE UNIT
PUMP PEDESTAL MOUNTED
2.0 Unpacking, Handling and Storage
2.3 Handling
Refertothepumpweightsguide,priortousing
any lifting gear. Use the correct lifting straps
for the pump weight (or pump and drive if
applicable). (See below).
Toavoidanyproblems,onreceiptofyourpump
always use the following procedure:-
2.1 Documents
1. Checkthedeliverynoteagainstthegoods
received.
2. Check if the pump has been delivered
with an electric motor that the motor
instructions are available.
2.2 Unpacking
Caremustbetakenwhenunpackingthepump,
and the following stages must be completed:-
1. Inspectthepackingforanypossiblesigns
of damage in transit.
2. Carefully remove the packing away from
the pump.
3. Inspect the pump for any visible signs of
damage.
4. Clean away the packing from the pump
port connections.
5. Ensurethatanyadditionalequipmentsuch
assealflushingpipeworkisnotdamaged.
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OperatingManual
2.4 Pump Storage
Afterreceiptandinspectionifthepumpisnotto
be installed immediately the pump should be
repacked and placed in suitable storage. The
following points should be noted:-
1. Plastic or gasket type port covers should
be left in place.
2. Pumps received wrapped with corrosion
inhibiting treatment material should be
rewrapped.
3. A clean, dry storage free from vibration
location should be selected. When a
moistdustyatmospheremustbeusedfor
storage, further protect the pump or unit
withamoisturerepellentcoveruntilitisto
be installed.
4. Rotate pump/pump unit by hand, weekly
to prevent bearing damage.
5. Allassociatedancillaryequipmentshould
be treated similarly.
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Operating Manual
3.1 General Pump Description
The pump supplied is a positive displacement
pump,which maybesuppliedwith orwithouta
drive unit (see below). The drawing below
indicates various parts of the pump.
3.2 Working Principle
The pumps are of the positive displacement
rotary type. The volume at the inlet increases
whenthegearsrotateandtheproductisdrawn
into the pump. It is then transported in the
space between the gears and the periphery of
the body to the discharge side. The volume
between the gears is reduced here and the
product is forced out through the outlet.
PUMP WITH DRIVE UNIT
Motor Coupling
Pump
Front
Cover
Ports
Product
Seal Area
Drive
Shaft
BARESHAFT PUMP
Gearbox
3.0 Description Of Pump Or Pump Unit
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Operating Manual
PUMPSIZE A B B1 C D E F G H J K L M N P Q R S T U
N1-000S-H07 ¼in 42 - 54 115 6.5 12 30 71 25 4 250 25 103 80 11 102 105 90 7
BSPT
N1-000L-H07 ½-1in 42 68 54 115 6.5 12 30 71 25 4 266 31 103 80 11 102 105 90 7
BSPT
Dimensions are give for guidance only and should not be used for installation purposes.Dimensions are give for guidance only and should not be used for installation purposes.
Dimensions are give for guidance only and should not be used for installation purposes.Dimensions are give for guidance only and should not be used for installation purposes.
Dimensions are give for guidance only and should not be used for installation purposes.
Certified drawings will be supplied on request. Dimensions in millimetres.Certified drawings will be supplied on request. Dimensions in millimetres.
Certified drawings will be supplied on request. Dimensions in millimetres.Certified drawings will be supplied on request. Dimensions in millimetres.
Certified drawings will be supplied on request. Dimensions in millimetres.
GG
GG
G
JJ
JJ
J 'K' Key'K' Key
'K' Key'K' Key
'K' Key
WidthWidth
WidthWidth
Width
HH
HH
H
'F''F'
'F''F'
'F'
SHAFTSHAFT
SHAFTSHAFT
SHAFT
QQ
QQ
Q
PP
PP
PNN
NN
N
LL
LL
L
MM
MM
M
B1B1
B1B1
B1
BB
BB
B
B1B1
B1B1
B1
DD
DD
D
CC
CC
C
SS
SS
S
TT
TT
T
A PortA Port
A PortA Port
A Port
DiameterDiameter
DiameterDiameter
Diameter
4 Holes 'U'4 Holes 'U'
4 Holes 'U'4 Holes 'U'
4 Holes 'U'
DiameterDiameter
DiameterDiameter
Diameter
BB
BB
B
Alternative 1" Male Adaptors fitted toAlternative 1" Male Adaptors fitted to
Alternative 1" Male Adaptors fitted toAlternative 1" Male Adaptors fitted to
Alternative 1" Male Adaptors fitted to
N1-000L-H07 Model onlyN1-000L-H07 Model only
N1-000L-H07 Model onlyN1-000L-H07 Model only
N1-000L-H07 Model only
RR
RR
R
EE
EE
E
3.3 Pump Dimensions
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Operating Manual
BARESHAFT PUMP PUMP UNIT - PUMP COMPLETE WITH
DRIVE UNIT
PUMP
MODEL
N1-000S and L
BARESHAFT
PUMP
KG
10
PUMP WITH DRIVE UNIT
KG
40
Theaboveweightsareforguidanceonlyandwillvarydepending upon
the specification of the pump and drive unit.
3.5 Pump Displacement and Capacities
The followingtabledetailsthepumpcapacities
for the pump models. This figure will change
dependinguponspeed,pressure,temperature
andproductbeingpumped.
PUMP
MODEL
N1-000S-H07
N1-000L-H07
MAXIMUM
SPEED
(RPM)
1000
1000
APPROX
DISPLACEMENT
LITRES/HOUR
1230
2316
3.4 Pump and Pump Unit Weights
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OperatingManual
PLAN VIEW SUCTION LINE
PLAN VIEW SUCTION LINE
Discharge
Line
4.0 System Design and Installation
4.1 System Design Advice
When designing the pumping system :-
DO -confirm with the supplier the Net
Positive Suction Head (NPSH)
requirementsforthesystem,asthis
is crucial for ensuring the smooth
operation of the pump and
preventing cavitation.
DO -avoid suction lifts and manifold/
commonsuctionlinesfortwopumps
runninginparallel,asthismaycause
vibration or cavitation.
DO -protect the pump against blockage
from hard solid objects e.g. nuts,
bolts etc. Also protect the pump
fromaccidentaloperation against a
closed valve by using one of the
following methods :- relief valves,
pressureswitch, current monitoring
device.
DO -fit suction and discharge pressure
gauges to monitor pressures for
diagnostic purposes.
DO -install non-return valve to prevent
turbining when high pressures are
appliedtothepumpwhilstitisnotin
use.Valvesarealsorecommended
if two pumps are to be used on
manifold/common discharge lines.
DO - provide a hose cleaning facility to
assist maintenance, ensuring the
driveunitmeetsthespecificationfor
hose cleaning.
DO NOT-subject the pump to rapid
temperature changes during C.I.P.
(Cleaning in Place) procedures.
PUMP SEIZURE CAN RESULT
FROM THERMAL SHOCK. The
differential pressure across the
pump should be near zero when
cleaning. A suitable by-pass is
recommended.
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Operating Manual
1 D
Minimum
½ D
Minimum
4.3 Installation
Before the pump is installed it is advisable to
consider the following:
Always -Ensure that the mounting
surfaceisflattoavoiddistortion
of the pump and drive unit.
Always -Allow at least one metre for
pumpaccess/maintenanceall
around the pump.
Ensure that there is an
adequate electrical supply
close to the pump drive unit.
Thisshouldbecompatiblewith
the electric motor selected.
4.2 Pump and Base Foundations
Depending on your requirements the pump
and drive (if supplied) may arrive mounted on
a baseplate. Our standard baseplates have
pre-drilledfixingholestoacceptbaseretaining
bolts.
To provide a permanent, rigid support for
securingthepumpunitafoundationisrequired,
thiswillalsoabsorbvibration,strainorshockon
the pumping unit.
Foundation Size
The foundation should be approximately
100mm longer and wider than the mounting
base of the unit. The depth of the foundation
should be proportional to the size of the pump
unit. (Pump coupled to drive unit.)
Bolt Location Dimensions
The location and sizes of the relevant bolting
down holes can be provided on a certified
drawing from your supplier.
Typical Foundation Bolts
The drawing below shows two methods for
foundationboltretaining. Thesleeveallowsfor
'slight' lateral movement of the bolts after the
foundation is poured. Use rag or paper to
prevent the concrete from entering the sleeve
while the foundation is poured. A minimum of
14 days is required to allow the airing of the
concrete prior to operation.
D = Diameter of foundation bolt
Electrical -
Supply
10

OperatingManual
Pipework
Support
Pipework
Support
4.4 Pipework
All pipework MUST be supported. The pump
MUST NOT be allowed to support any of the
pipework weight.
Remember- Pipework supports must also
support the weight of the
product being pumped.
Always :-
Have - Short straight suction lines to
reduce friction losses in the
pipework thereby improving
the NPSH available.
Avoid -Bends,teesandanyrestraints
close to either suction or
discharge side of pump. Use
long radius bends wherever
possible.
Provide - Isolating valves on each side
ofthepumptoisolatethepump
when necessary.
Keep - Pipework horizontal where
applicable to reduce air locks.
Include eccentric reducers on
suction lines.
Check - Coupling alignment during
installation to highlight
pipework alignment/support
problems.
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Operating Manual
IF THERE ARE ANY PUMPING PROBLEMS
REFER TO THE FAULT FINDING CHART
ALL ANSWERS SHOULD BE YES BEFORE PROCEEDING
5.0 Start Up, Shut Down and Cleaning
5.1 Pump Start Up Check List
1. Is the location of the 'stop' button clear?
2. Has the pipework system been flushed
through to purge welding slag and any
other hard solids.
3. Havealltheobstructionsbeenremoved
from the pipework or pump?
4. Arethepumpconnectionsandpipework
joints tight and leak-free?
5. Are the pipework valves open?
6. Are all safety guards in place?
7. Start then stop the pump, is the product
flowing in the correct direction?
8. Are the pump speed/pressure settings
below the pump maximum limitations?
YES NO
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