Alfalaval MIB 303S-13 User manual

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Alfa Laval Separation AB
Separator Manuals, dept. SKEL
S-147 80 Tumba, Sweden
Telephone: [phone]
Telefax: [phone]
Printed in Sweden, 00-08
© Alfa Laval Separation AB 2000
This publication or any part thereof may not be
reproduced or transmitted by any process or
means without prior written permission of
Alfa Laval Separation AB.

Contents
3
1 Safety Instructions 9
2 Separator Basics 13
2.1 Application 13
2.2 Conversion kit 14
2.3 Description of main parts 14
2.3.1 Overview 14
2.3.2 Detailed description 15
2.3.3 Paring disc 16
2.4 Working principle 17
2.4.1 Clarifier mode 17
2.4.2 Purifier mode 17
2.5 Changing operation mode 18
3 Operating Instructions 21
3.1 Separation mode 21
3.2 Separation time 22
3.3 Operating routine 22
3.3.1 Introduction 22
3.3.2 Before start 23
3.3.3 Start 24
3.3.4 Operation 25
3.3.5 Manual stop 25
3.3.6 Automatic stop 26

4
4 Trouble shooting 27
4.1 The separator does not start 27
4.2 The separator stops 28
4.3 The separator vibrates 28
4.4 Noise 29
4.5 Low outlet flow 29
4.6 Insufficient separation result 29
4.7 Some oil is escaping through water outlet 30
4.8 Oil flows through water outlet only 30
4.9 No outlet flow either through clean oil
outlet or water drain 31
4.10 Oil leakage through water outlet when
separator is not running 31
5 Maintenance 33
5.1 Cleaning 33
5.2 Once per year 34
5.3 Every second year 34
5.3.1 Disc stack replacement 34
5.3.2 Vibration damper replacement 34
5.4 Dismantling - assembly instructions 35
5.4.1 Introduction 35
5.4.2 Cleaning of bowl 36
5.4.3 Replacement of O-rings in purifier bowl 40
5.4.4 Replacement of O-rings in clarifier bowl 42
5.4.5 Replacement of motor bearings 44
5.4.6 Replacement of connection housing 47
5.4.7 Replacement of frequency converter 48

5
6 Technical data 49
6.1 Technical data 49
6.2 Basic size drawing 51
6.3 Connection list 52
6.4 Interface description 53
6.5 Foundation drawing 55
6.6 Connection diagrams 56
6.6.1 230 V AC 56
6.6.2 110 V AC 57
6.6.3 24 V DC 58

6

7
Study instruction manuals and observe the
warnings before installation, operation,
service and maintenance.
Not following the instructions can result in
serious accidents.
In order to make the information clear only foreseeable conditions
have been considered. No warnings are given, therefore, for
situations arising from the unintended usage of the machine and its
tools.

8

9
1 Safety Instructions
The centrifugal separator includes parts that
rotate at high speed. This means that:
•Kinetic energy is high
•Great forces are generated
Manufacturing tolerances are extremely fine.
Rotating parts are carefully balanced to reduce
undesired vibrations that can cause a breakdown.
Material properties have been considered
carefully during design to withstand stress and
fatigue.
The separator is designed and supplied for a
specific separation duty (type of liquid, rotational
speed, temperature, density etc.) and must not be
used for any other purpose.
Incorrect operation and maintenance can result in
unbalance due to build-up of sediment, reduction
of material strength, etc., that subsequently could
lead to serious damage and/or injury.
The following basic safety instructions therefore
apply:
•Use the separator only for the purpose
and parameter range specified by
Alfa Laval.
•Strictly follow the instructions for
installation, operation and maintenance.
•Ensure that personnel are competent and
have sufficient knowledge of maintenance
and operation, especially concerning
emergency stopping procedures.
•Use only Alfa Laval genuine spare parts
and the special tools supplied.
G0010411

1 Safety Instructions
10
WARNING
Disintegration hazards
•Use the separator only for the purpose
and parameter range specified by
Alfa Laval.
•If excessive vibrations occur, keep liquid
feed on and stop separator.
•Welding or heating of parts that rotate
can seriously affect material strength.
•Inspect regularly for corrosion and
erosion damage. Inspect frequently if
process liquid is corrosive or erosive.
Entrapment hazards
•Make sure that rotating parts have come
to a complete standstill before starting
any dismantling work.
•To avoid accidental start, switch off and
lock power supply before starting any
dismantling work.
•Assemble the machine completely
before start. All covers and guards must
be in place.
Electrical hazards
•Follow local regulations for electrical
installation and earthing (grounding).

11
1 Safety Instructions
Warning signs in the text
Pay attention to the safety instructions in this
manual. Below are definitions of the three grades
of warning signs used in the text where there is a
risk for injury to personnel.
WARNING
Type of hazard
This type of safety instruction indicates a
situation which, if not avoided, could result in
disabling injury or disabling damage to
health.
CAUTION
Type of hazard
This type of safety instruction indicates a
situation which, if not avoided, could result in
light injury or light damage to health.
NOTE
This type of instruction indicates a situation
which, if not avoided, could result in damage
to the equipment.

1 Safety Instructions
12
Warning label
Warning label placed on the separator hood.
Interpretation:
Stop! Read the instruction manual before
installation, operation and maintenance.
Failure to strictly follow instructions can lead to
fatal injury.
Machine plate
Plate placed on the separator base.
Text on label:
Separator type MIB 303S-13/33
Product number 881176-06-01
Speed max. 7 500 r/min
Rotation ----->
Supply voltage 230V ~50/60 Hz 110V ~50/60 Hz 24V DC
Current max. 4 A 8A 30A
S0147811
ANSI-label for the US market
S0147911
ISO-label for other markets
S0061411

13
2 Separator Basics
2.1 Application
The use of the separator is restricted to removal
of water and solids from gas oil, marine diesel oil
and lube oil.
The table below shows examples of oils to be
treated:
Oil type Density at +15 °C Viscosity at +40 °C
Recommended
separation
temperature (°C)
Gas oil 810 - 860 kg/m31,5 - 6 cSt 40
Marine diesel oil 850 - 920 kg/m3Up to 14 cSt 40
Lube oil Max. 920 kg/m3Up to 150 cSt 70
NOTE
Maximum permissible separation
temperature is +70 °C.
WARNING
Disintegration hazard
Do not use the separator for separating any
oils or liquids other than those specified
above.

2.2 Conversion kit 2 Separator Basics
14
2.2 Conversion kit
If the liquid to clean only contains smaller
amounts of water and solids, the purifier bowl can
be converted to a clarifier, using the optional
conversion kit to replace the purifier parts in bowl,
see ‘‘2.5 Changing operation mode” on page 18.
A brief explanation of the different modes is given
in ‘‘2.4 Working principle” on page 17.
2.3 Description of main
parts
2.3.1 Overview
A general view of the separator is shown in the
illustration beside.
The oil is fed to the oil inlet (A) and down to the
rotating bowl (1) where separation takes place.
The cleaned oil leaves the separator at (B). If the
separator is working as purifier, the separated
water runs down the water collecting channel (5)
to the water outlet (C).
The bowl (1) and motor (3) are suspended on
three vibration dampers (2).
The frequency converter (4) for the motor is
mounted at the bottom of the separator.
G0450551
Separator
A. Dirty oil inlet
B. Clean oil outlet
C. Water outlet.
When the separator is stopped the bowl is
drained via this outlet.
1. Bowl
2. Vibration dampers
3. Electric motor
4. Frequency converter
5. Water collecting channel
More details are shown in the illustration on next
page.

15
2 Separator Basics 2.3 Description of main parts
2.3.2 Detailed description
Separation takes place in the bowl (6) which is
mounted directly on the motor shaft. The bowl
contains a set of conical discs (7) between which
the separation process takes place.
The bowl wall (6) and the paring chamber cover
(2) are held in place by the lock nut (5).
The paring disc (3) is stationary, held by the
paring disc knob (1). Below the paring disc a level
ring (4) is fitted. Two level rings are delivered with
the separator. Which level ring to be used is
dependent of which type of oil to be separated.
See further description in ‘‘3.3.2 Before start” on
page 23.
The motor flange rests on three rubber cushions
(17) in the frame (8). When operating the
separator as purifier, an inclined channel in the
motor flange directs water that has been
separated from the oil down to the water outlet
(10).
The motor (9) is powered via an electronic
frequency converter (11), which converts the
incoming mains to an output frequency of 125 Hz.
This gives the motor and bowl an operating speed
of 7500 r/min. When the current is switched off
the converter acts as a brake quickly reducing the
speed to below 1000 r/min. within 25 seconds.
The separator is equipped with the following
safety devices:
A safety yoke (13) over the hood (14) and the oil
connection housing (12) has a magnet (15) which
operates a magnetic safety switch (16), so that
power can only be supplied to the motor when the
yoke is in its upright position. The yoke can be
raised to this position only when both the
mounting screws of the hood and the paring disc
knob (1) have been tightened.
The separator also has built-in overload
protection.
NOTE
The lock nut has a conventional right-hand
thread contrary to most Alfa Laval separators
that have left-hand threaded lock rings.
G0406221
Separator main parts
1. Paring disc knob
2. Paring chamber cover
3. Paring disc (see separate description on page 16)
4. Level ring
5. Lock nut
6. Bowl
7. Disc stack
8. Frame
9. Motor
10. Water outlet
11. Frequency converter
12. Oil connection housing
13. Safety yoke
14. Hood
15. Magnet
16. Magnetic safety switch
17. Rubber cushions

2.3 Description of main parts 2 Separator Basics
16
2.3.3 Paring disc
The paring disc serves as a stationary pump
wheel mounted in a chamber in the rotating bowl
neck. The paring disc dips radial into the rotating
liquid ring and pares out the liquid (oil). The
paring disc is used as a discharge pump.
G0631061
The liquid and all bowl parts (except the stationary
paring disc) rotate in direction illustrated by arrow (A)

17
2 Separator Basics 2.4 Working principle
2.4 Working principle
2.4.1 Clarifier mode
The unseparated oil continuously enters at (A)
and flows into the bowl (1). The particles (2) are
separated and deposited on the bowl wall.
The cleaned oil is forced inwards to the centre of
the bowl and up to a paring disc (not illustrated).
Since the oil is rotating, the stationary paring disc
acts as a pump which forces the oil out through
outlet (B) under a constant pressure.
The particles accumulated on the bowl wall are
removed periodically by hand.
2.4.2 Purifier mode
When operating the separator as a purifier a
water seal must be established before the oil feed
is started. If not, oil will flow out through the water
outlet (C). How to proceed is described in ‘‘3.3.3
Start” on page 24.
Otherwise the separation principle is similar to
clarification except that the separated water,
which is heavier than the oil, leaves through the
underside of the bowl at (C).
G0519251
Clarifier bowl
G0519241
Purifier bowl

2.5 Changing operation mode 2 Separator Basics
18
2.5 Changing operation
mode
When changing operating mode from clarifier to
purifier, or vice versa, proceed as follows:
1. Dismantle the separator in the same way as
when cleaning the bowl, see 5.4.2 on page
36.
2. Remove the level ring, O-ring, lower part of
paring chamber and the sleeve with wings.
3. Unscrew the centre screw.
4. Lift out the bowl insert. If it is difficult to get
the insert loose from the bowl spindle, then
first remove the splash guard (the white
plastic ring) to get a better grip on the bowl
bottom.
G05191G1G05191E1G05191D1
G0449011

19
2 Separator Basics 2.5 Changing operation mode
A number of parts have to be replaced in the bowl when changing operation
mode. The illustration below shows the differences between a clarifier and purifier
bowl insert. The number of bowl discs is also different between the modes.
Clarifier bowl insert (fitted as delivered)
1. Bowl bottom (clarifier), no holes
2. Bottom disc (purifier)
Purifier bowl insert
3. Bowl bottom (purifier) with three holes (*)
5. Rebuild the bowl insert as
described below.
a. Separate the bowl insert
parts as illustrated.
b. Add (as clarifier) or remove
(as purifier) 5 pcs of the bowl
discs.
c. Replace the bottom disc.
d. Remove (as clarifier) or add
(as purifier) the three O-rings
fitted on the pins betweenthe
bottom disc and bowl bottom.
e. Replace the bowl bottom.
f. Assemble the bowl insert
parts as illustrated.
Centre rod
Inlet cone
Bowl discs
- Clarifier: 41 pcs
- Purifier: 36 pcs
Bottom disc
O-rings, 3 pcs (in
purifier insert only)
Bowl bottom (the
difference between the
bottoms is shown in the
illustration above)
G0908921
G0908931
Clarifier bowl insert Purifier bowl insert

2.5 Changing operation mode 2 Separator Basics
20
6. When fitting the insert, check that the
cylindrical pin (1) is not missing in the shaft.
Check that the pin enters the guide in the
bottom of the insert.
7. Tighten the centre screw.
Check that one washer is fitted under the
screw.
8. Fit the sleeve with wings, lower part of paring
chamber, level ring and O-ring.
Use correct level ring, see ‘‘3.3.2 Before start”
on page 23.
NOTE
See the instructions in ‘‘5.4.2 Cleaning of
bowl’’ on pages 38-39 how to fit the level ring
and O-ring correctly.
These pages also describe the rest of the
assembly of the separator.
G0907011G05191D1G05191C1G05191G1