Alfa Laval C MRPX 614HGV-74C, H MRPX 614HGV-74C, A MRPX 614HGV-14C, B MRPX 714HGV-14C, C MRPX 714HGV-74C Operator's Manual
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Operator’s Manual
Self-cleaning Hermetic Separators
Product N o. :
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
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
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.: Multiple
Book No.: 1271058-02 V3
881209-03-01
881209-03-01
881210-01-01
881210-01-02
881210-01-02
881210-01-02
881210-01-02
Alfa Lav al Separati on AB
Separator Manuals, dept. SKEL
S-147 80 Tumba, Sweden
Telephone: +46 8 53 06 50 00
Telefax: +46 8 53 03 10 40
Printed in Sweden, 99-12
© Alfa Laval Separation AB 1999
This pub lic ation or any part thereof m ay not be
reprod uc ed or transm it t ed by any proc es s or
means wi th out prior writ te n permissio n of
Alfa Laval Separation AB.
Study instruction manuals and observe the
warnings before installation, operation,
service and maintenance.
Not following the instructions can result in
seriou s accident s.
In order to m ak e t he informat ion clear only foreseeable c onditions
have been considered. No warnings are gi v en, t herefore, fo r
situations arising from the unintended usage of the machine and its
tools.
3
4
Contents
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
5
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
6
1 Safety Instructions
The centrif ugal separ at or includes pa rt s th at
rotate at high speed. T his m eans that:
• Kinetic energy is high
• Great fo rc es are generat ed
• Stopping time is lon g
Manufacturing tolerances are extremely fine.
Rotating parts are ca ref ully balance d t o reduce
undesired vibrations that can cause a breakdown.
Material properties have been considered
carefully during des ign to withstand stress and
fatigue.
G0010411
The separ at or is designed and supp lied for a
specific separation dut y (t y pe of liquid, rotat ional
speed, temperature, density etc.) and must not be
used for an y oth er purpose .
Incorrect operation and maintenance can result in
unbalance due to bui ld-up of sediment, reduc ti on
of material strength, etc., that subsequent ly coul d
lead to seri ous damage a nd/or injury.
The following basic sa f et y ins t ruc t ions 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.
7
DANGER
Disintegration hazards
• Use the separator only for the purpose
and para m et er range spe c if ied by
Alfa Laval.
• If excessive vibration occurs, stop
separat or and keep bowl filled with
liquid during rundown.
• When power cables are conn ec t ed,
always check direction of motor rotati on.
If incorrec t , vit al rotating parts could
unscrew.
1 Safety Instructions
S0051311
• Chec k th at th e gear ratio is c orrect for
power frequency used. If incorrect,
subsequ ent oversp eed may result in a
serious b reak down.
• Welding or heating of parts that rotat e
can serio us ly affec t m at erial strengt h.
• Wear on t he large lock ring thread mu s t
not exceed safety limit. φ-mark on lock
ring must not pass op pos it e φ-mark by
more than specified distance.
• Inspe c t re gularly for corrosion and
erosion damage. Inspect frequently if
process liquid is corrosive or erosiv e.
S005 5611
8
1 Safety Instructions
DANGER
Entrapment hazards
• Make sure that rotating part s have come
to a complete standsti ll be fo re s t arting
any dismantling work.
• To avoid accidental start, switch off and
lock power supply before startin g any
dismantling work.
• Assemble the machine completely
before start. All covers and guards must
be in place.
S0051111S0051011
Electrical hazards
• Follow lo c al regulatio ns fo r electrical
installation and earthing (grounding).
W ARNING
Crush hazards
• Use correct lifting to ols and follow lift ing
instructions.
• Do not work un der a hanging load.
Noise hazards
• Use ear p rot ection in nois y
environm ents.
S0051711
S0051611
9
CAUTION
Burn hazards
• Lubr ic at ion oil and var ious machin e
surfaces c an be hot and cause burns .
Cut hazards
• Sharp edges on separator discs and lock
ring threads can cau s e c ut s .
1 Safety Instructions
S0055411S0054311
10
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 sig ns us ed in the text w here there is a
risk for injury t o personne l.
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 dam age to
health.
CAUTION
Type of hazard
This type of safety instruction indicates a
situation which, if not avoided, could result in
light injury or ligh t dam age to hea lt h.
NOTE
This type of instruction indicates a s it uat ion
which, if not avoided, could result in damage
to the equip m ent.
11
1 Safety Instructions
12
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
13
2 Separation process
14
2 Separation process 2.1 Basic principles
2.1 Basic principles
The purpos e of separat ion can be:
• to free a liq uid of solid part ic les.
• to separate two mutually insoluble liquids with
different densities, removing any solids at the
same time.
• to separ at e and concentrate sol id particles
from a liq uid.
Sedimentation by gravity
2.1.1 Separ ation by gravity
A turbid liquid in a statio nary vessel will c lear
slowly as the heavy part ic les in the liqui d m ix t ure
are sinkin g to th e bottom un der the influen c e of
gravity. The lighter liqu id phase will ris e while the
heavier sinks.
G0010711
Continuo us se paration and sedimentation can be
achieved in a s et t ling tank hav ing the outlets
arranged at levels suited to the density ratio of the
two liquid p hases. Any s olids and heav ier
particles in the liquid mixture will settle and form a
sediment layer on the tank bottom.
2.1.2 Centrifugal se paration
In a rapidly rot at ing vessel the gravity is rep laced
by the cent rif ugal force, which can be thousands
of times gre at er. Separ at ion and sed im entation
are contin uous and very f as t . When liquid an d
solid parti cl es in a liquid mixt ure are subjec te d t o
the centrif ugal force in a s eparator bow l, it tak es
only a few seconds to achieve what takes many
hours in a ta nk under influe nc e of gravity.
G0010821
Sedimentation in a settling tank, with outlets making it
possible to separate the lighter liquid parts from the
heavier
The centrifugal solution
G0010921
15
2.2 General 2 Separation process
2.2 General
Twin phase separators
The flow of t he product th rough the ma ch ine is
shown in th e adjoining f igure.
Product is fe d t o t he inlet bend (1) f or f urther
conveyance through the hollow bowl spindle (2)
to the dist ributor (3) an d onwards th rough the
distribu t ion holes in the discs (4). The s eparation
takes place in the spaces between t he discs. The
light phas e is forced a long the upper s ides of the
discs towards the bowl centre, leaves the bowl
and is ref orw arded by the impeller (5). T he rest –
heavy phase and sediment – moves along the
undersides of the d is c s tow ards the bowl
periph ery w here 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 effec t s 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
16
2 Separation process 2.2 General
Single phase separators
The flow of the product thro ugh the machine is
shown in the adjoining figure.
Product is f ed to the inlet b end (1) for further
conveyance through the hollow bow l spindle (2 )
to the distri but or (3) and onw ards throug h t he
distribution holes in the discs (4). The separation
takes place in the spaces b etwee n the di scs. Th e
liquid is forced along th e upper sides of the discs
towards th e bowl centr e, leaves the bo w l and is
reforward ed by the imp eller (5). The re s t –
sedimen t – mo v es along the un dersides of th e
discs towards the bowl periphery where the
sedimen t set t les in the sedim ent 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
resistanc e in the separator and sub s equent
devices and piping as well as on the height of the
collecting t anks abov e th e outlet.
The throu ghput is regulated by adju s ti ng t he inlet
pressure .
G0695711
17
2.2 General 2 Separation process
2.2.2 Light phase
Twin phase separators only
Decrea s ed light phase
counte rpressure
Increa se d light phase
counte rpressure
The light phase flow and thus the concentration of
the light phase are de te rm ined by the pre s s ure
difference between the two outlets. With one and
the same throughput a certain pressure
difference w ill always g iv e t he s ame light pha s e
flow. With higher c ounterpre s su re in the light
phase outlet pipe th e light phase concentrat ion
will be higher.
lower concentration
➞
higher conc entration
➞
A. Light phase
B. Heavy phase
G0699721
2.2.3 Air penetration / inlet pressure
A prereq uis ite for satis fa c to ry s eparation is that
air is prev ented from mi xi ng with the proc es s
liquid.
Air pene t rat ion can occu r f or instance if the
pressu re 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 dime ns ions or by changing at the
incorrec t time. Even si m ult aneous filling and
emptying of a tank can result in admixture of air.
Make sure, therefo re, that the inle t pres s ure is
kept at th e recomme nded value and that the
balance vessel is always full. In the vessel, the
liquid should flow gently withou t b ubbling.
G0699811
18
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 ind ication 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
19
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