Alfalaval A MRPX 614HGV-14C User manual

Product No.: Multiple
Book No.: 1271058-02 V3
Operator’s Manual
Self-cleaning Hermetic Separators
A MRPX 614HGV-14C
C MRPX 614HGV-74C
H MRPX 614HGV-74C
W MRPX 614HGV-74C
A MRPX 714HGV-14C
B MRPX 714HGV-14C
C MRPX 714HGV-74C
H MRPX 714 HGV-74C
W MRPX 714HGV-74C
B BRPX 714HGV-34C
D MRPX 714HGV-34C
C MRPX 518HGV-74C
H MRPX 518HGV-74C
W MRPX 518HGV-74C
B MRPX 618HGV-14C
C MRPX 618HGV-74C
F MRPX 618HGV-74C
H MRPX 618HGV-74C
W MRPX 618HGV-74C
B BRPX 618HGV-34C
D MRPX 618HGV-34C
H MRPX 718HGV-74C
W MRPX 718HGV-74C
H MRPX 818HGV-74C
B MRPX 818HGV-14C
B BRPX 818HGV-34C
H MRPX 818HGV-74C
W MRPX 818HGV-74C
Product No.:
881208-01-01
881208-01-01
881208-01-01
881208-01-01
881208-02-01
881208-02-01
881208-02-01
881208-02-01
881208-02-01
881208-02-01
881208-02-01
881209-01-01
881209-01-01
881209-01-01
881209-02-01
881209-02-01
881209-02-01
881209-02-01
881209-02-01
881209-02-01
881209-02-01
881209-03-01
881209-03-01
881210-01-01
881210-01-02
881210-01-02
881210-01-02
881210-01-02

Alfa Laval Separation AB
Separator Manuals, dept. SKEL
S-147 80 Tumba, Sweden
Telephone: [phone]
Telefax: [phone]
Printed in Sweden, 99-12
© Alfa Laval Separation AB 1999
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.

3
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.

4

Contents
5
1 Safety Instructions 7
2 Separation process 13
2.1 Basic principles 15
2.2 General 16
3 Mechanical function 19
3.1 Identification and safety signs
on the machine 20
3.2 Power transmission 23
3.3 Brake 26
3.4 Speed indication 26
3.5 Outlet / inlet (twin phase separators) 28
3.6 Outlet / inlet (single phase separators) 30
3.7 Axial seals –
cooling system 31
3.8 Bowl 33
4 Sediment discharge function 35
4.1 Function description 36
4.2 Operating water module compact (OWMC) 38
5 Installation and first start 41
5.1 Preparations 42
5.2 Before first start 43
5.3 First start 44
5.4 Operation 44
5.5 Stopping 46
6 Cleaning 47
6.1 Check of cleaning 48

6
7 Operating routine 51
7.1 Check points 52
8 Trouble tracing 55
8.1 Mechanical function 56
8.2 Sediment discharge function 59
8.3 Axial seals 61

7
1 Safety Instructions
The centrifugal separator includes parts that
rotate at high speed. This means that:
•Kinetic energy is high
•Great forces are generated
•Stopping time is long
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
8
DANGER
Disintegration hazards
•Use the separator only for the purpose
and parameter range specified by
Alfa Laval.
•If excessive vibration occurs, stop
separator and keep bowl filled with
liquid during rundown.
•When power cables are connected,
always check direction of motor rotation.
If incorrect, vital rotating parts could
unscrew.
•Check that the gear ratio is correct for
power frequency used. If incorrect,
subsequent overspeed may result in a
serious break down.
•Welding or heating of parts that rotate
can seriously affect material strength.
•Wear on the large lock ring thread must
not exceed safety limit. φ-mark on lock
ring must not pass opposite φ-mark by
more than specified distance.
•Inspect regularly for corrosion and
erosion damage. Inspect frequently if
process liquid is corrosive or erosive.
S0051311
S0055611

9
1 Safety Instructions
DANGER
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).
WARNING
Crush hazards
•Use correct lifting tools and follow lifting
instructions.
•Do not work under a hanging load.
Noise hazards
•Use ear protection in noisy
environments.
S0051111S0051011
S0051711
S0051611

1 Safety Instructions
10
CAUTION
Burn hazards
•Lubrication oil and various machine
surfaces can be hot and cause burns.
Cut hazards
•Sharp edges on separator discs and lock
ring threads can cause cuts.
S0055411S0054311

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.
DANGER
Type of hazard
This type of safety instruction indicates a
situation which, if not avoided, could result in
fatal injury or fatal damage to health.
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

13
2 Separation process
Contents
2.1 Basic principles 15
2.1.1 Separation by gravity 15
2.1.2 Centrifugal separation 15
2.2 General 16
2.2.1 Throughput 17
2.2.2 Light phase 18
2.2.3 Air penetration / inlet pressure 18

2 Separation process
14

15
2 Separation process 2.1 Basic principles
2.1 Basic principles
The purpose of separation can be:
•to free a liquid of solid particles.
•to separate two mutually insoluble liquids with
different densities, removing any solids at the
same time.
•to separate and concentrate solid particles
from a liquid.
2.1.1 Separation by gravity
A turbid liquid in a stationary vessel will clear
slowly as the heavy particles in the liquid mixture
are sinking to the bottom under the influence of
gravity. The lighter liquid phase will rise while the
heavier sinks.
Continuous separation and sedimentation can be
achieved in a settling tank having the outlets
arranged at levels suited to the density ratio of the
two liquid phases. Any solids and heavier
particles in the liquid mixture will settle and form a
sediment layer on the tank bottom.
2.1.2 Centrifugal separation
In a rapidly rotating vessel the gravity is replaced
by the centrifugal force, which can be thousands
of times greater. Separation and sedimentation
are continuous and very fast. When liquid and
solid particles in a liquid mixture are subjected to
the centrifugal force in a separator bowl, it takes
only a few seconds to achieve what takes many
hours in a tank under influence of gravity.
G0010711
Sedimentation by gravity
G0010821
Sedimentation in a settling tank, with outlets making it
possible to separate the lighter liquid parts from the
heavier
G0010921
The centrifugal solution

2.2 General 2 Separation process
16
2.2 General
Twin phase separators
The flow of the product through the machine is
shown in the adjoining figure.
Product is fed to the inlet bend (1) for further
conveyance through the hollow bowl spindle (2)
to the distributor (3) and onwards through the
distribution holes in the discs (4). The separation
takes place in the spaces between the discs. The
light phase is forced along the upper sides of the
discs towards the bowl centre, leaves the bowl
and is reforwarded by the impeller (5). The rest –
heavy phase and sediment – moves along the
undersides of the discs towards the bowl
periphery where the sediment settles in the
sediment space (6). The heavy phase continues
along the upper side of the top disc (7) to the
impeller (8), which effects the further routing.
Legend
1. Inlet bend
2. Bowl spindle (hollow)
3. Distributor
4. Bowl discs
5. Impeller – light phase
6. Sediment space
7. Top disc
8. Impeller – heavy phase
G0695721

17
2 Separation process 2.2 General
Single phase separators
The flow of the product through the machine is
shown in the adjoining figure.
Product is fed to the inlet bend (1) for further
conveyance through the hollow bowl spindle (2)
to the distributor (3) and onwards through the
distribution holes in the discs (4). The separation
takes place in the spaces between the discs. The
liquid is forced along the upper sides of the discs
towards the bowl centre, leaves the bowl and is
reforwarded by the impeller (5). The rest –
sediment – moves along the undersides of the
discs towards the bowl periphery where the
sediment settles in the sediment space (6).
Legend
1. Inlet bend
2. Bowl spindle (hollow)
3. Distributor
4. Bowl discs
5. Impeller – separated liquid
6. Sediment space
2.2.1 Throughput
The throughput is directly dependent on the flow
resistance in the separator and subsequent
devices and piping as well as on the height of the
collecting tanks above the outlet.
The throughput is regulated by adjusting the inlet
pressure.
G0695711

2.2 General 2 Separation process
18
2.2.2 Light phase
Twin phase separators only
The light phase flow and thus the concentration of
the light phase are determined by the pressure
difference between the two outlets. With one and
the same throughput a certain pressure
difference will always give the same light phase
flow. With higher counterpressure in the light
phase outlet pipe the light phase concentration
will be higher.
2.2.3 Air penetration / inlet
pressure
A prerequisite for satisfactory separation is that
air is prevented from mixing with the process
liquid.
Air penetration can occur for instance if the
pressure in front of the inlet device is too low or if
the balance vessel suddenly becomes empty.
This can be caused by a careless change-over of
tanks, incorrect dimensions or by changing at the
incorrect time. Even simultaneous filling and
emptying of a tank can result in admixture of air.
Make sure, therefore, that the inlet pressure is
kept at the recommended value and that the
balance vessel is always full. In the vessel, the
liquid should flow gently without bubbling.
Decreased light phase
counterpressure
Increased light phase
counterpressure
➞
➞
lower concentration
higher concentration
G0699721
A. Light phase
B. Heavy phase
G0699811

19
3 Mechanical function
Contents
3.1 Identification and safety signs
on the machine 20
3.2 Power transmission 23
3.2.1 Motor and starter 25
3.3 Brake 26
3.4 Speed indication 26
3.5 Outlet / inlet
(twin phase separators) 28
3.5.1 Outlet pumps 28
3.5.2 Inlet device 28
3.5.3 Axial seals 28
3.6 Outlet / inlet
(single phase separators) 30
3.6.1 Outlet pump 30
3.6.2 Inlet device 30
3.6.3 Axial seals 30
3.7 Axial seals –
cooling system 31
3.8 Bowl 33

Identification and safety signs on the machine 3 Mechanical function
20
3.1 Identification and
safety signs on the
machine
1. Machine plate Text on plate (example):
Separator A MRPX 614HGV-14C
Manufacturing serial No / Year XXXX
Product No 881208-01-01
Machine top part 552032-02
Outlet 562013-02
Bowl 546860-12
Machine bottom part 553136-41
Max. speed (bowl) 4265 r/min (50 Hz)
Direction of rotation (bowl) ←
Speed motor shaft 1500 r/min (50 Hz)
El. current frequency 50 Hz / 60 Hz
Recommended motor power 18,5 kW
Max. density of feed 1100 kg/m3
Max. density of sediment 1380 kg/m3
Max. density of operating liquid 1000 kg/m3
Process temperature min./max. 0 - 100 °C
G0663751
S0061411