Marine Oil
Handling
Devices
5 Alfa – Laval
separator (II)
5.1
Inlet Bowl Outlet construction
5.1 Inlet,Bowl,Outlet
Figure 5.1
Cleaning,overhaul,lubrication.
? Satisfactory functioning cannot be ensured
unless the parts in contact with liquid are
carefully cleaned before assembly,This
applies particularly to seal rings,sliding
surfaces,guiding and contact surfaces,and
threads,Also take care that no burrs are
knocked up on the metal parts when
handling them,Follow the directions given
in chapter 5.4 and 4.5,
Exchange of parts
? Each bowl constitutes a balanced unit which will
get out of balance if any parts having an "*" added
to their part number in the general drawing are
exchanged without the bowl being rebalanced,To
prevent confusion of parts,for instance when a
plant consists of several machines of the same type,
these main parts are stamped either with the
complete manufacturing number or its three last
digits,
Guides
? When assembling make sure that the
parts are placed in the position defined
by the guides,Be careful not to
damage the guides when handling the
parts,
Seal rings,packings
Check seal rings and packings for defects
and make sure that the corresponding
grooves and sealing surfaces are well
cleaned.
After mounting check,the ring lies properly
(not twisted) in the groove and it fills the
groove evenly all around.
Threads,pressure in disc set
? Check the lock ring threads and the
pressure in the disc set at regular intervals-
see chapter 5.4,
Corrosion,erosion
? Aggressive liquids as well as liquids
containing very hard particles may cause
corrosion and erosion damage,If rapidly
growing or advanced damage is noticed
consult an ALFA-LAVAL/DE LAVAL
representative,
Bowl hood
? Lift the bowl hood off and on with the lifting tool.
To ease the hood off the bowl body,the central
screw of the tool is screwed down.
? If the hood does not engage on assembly,this
means that one of the locating pieces is out of
position - check this.
? The sealing ring at the lower edge of the hood
should not be removed except when being
exchanged–see Chapter Overhaul of Bowl,
Figure 5.2
Bowl insert parts
? The design of the insert parts determines whether
the bowl is of clarifier,purifier or concentrator
type,The bowl may be intended for one of these
processing methods or may be equipped and
balanced with parts for two of them so that either
can be chosen as needed,In the latter case it is
important that the bowl is correctly assembled
with the parts designed for the processing method
chosen,The exploded drawing shows how the
various insert pieces are assembled even when
the bowl is provided with alternative sets of parts.
Figure 5.3
Gravity disc
? For clarification,Use the gravity disc with
the smallest hole diameter "d".
? For purification,Use a gravity disc having
a suitable hole diameter in view of the
specific gravity ratio of the process liquid -
see chapter 5.2.
Level ring
If two level rings are delivered:
? For clarification or for purification with
"Regulation of interface by means of back
pressure regulation", the level ring with the
larger hole diameter "d" should be fitted in the
bowl.
? For purification with interface regulation by
means of the gravity disc only,the level ring with
the smaller hole diameter "d" should be fitted.
Distributor,Disc set
? Lift the distributor in and out with the
disc set on it,The center stud of the
lifting tool must be depressed in order
that the tool shall engage.
? Make sure that the discs are placed in the
correct order with No,l at the bottom,
Dismantling,assembly
? Dismantle and assemble the bowl with the
help of the special tools in the order
indicated by the exploded drawing,Place
the parts on a clean,soft surface.
? The bowl should rotate clockwise,The
principal components therefore have left-
hand threads where indicated in the text,
Lock rings
? The lock rings have left-hand threads and are
unscrewed clockwise,The large lock ring is
loosened by blows of a lead mallet or similar on
the handle of the spanner.
? Clean and lubricate the threads of the lock rings
and their contact surfaces with bowl hood and
bowl body before every assembly,Seizing may
be the result,especially in new machines,if this
lubrication is neglected or an unsuitable lubricant
is used,Careful lubrication of these surfaces will
prevent unnecessary wear on threads and contact
surfaces.
Lock rings
? Tighten the lock rings anti-clockwise - the small lock ring
until a tight seal is obtained and the large lock ring until
the bowl hood lies tightly against the bowl body.
? In a new bowl the marks ￠will now be in line with each
other,The lock ring should press the bowl hood against
the bowl body so that perfect sealing is obtained at the
seal ring and should also keep the distributor pressed
against the bottom of the bowl body,firmly clamping the
disc set,For final tightening it may thus be necessary to
hit the spanner handle with a lead mallet or similar (never
extend the spanner handle).
Cap nut
? The cap nut has a left-hand thread and is
unscrewed clockwise,Lubricate the thread
and contact surface before putting on,
Tighten the cap nut securely,
Sliding bowl bottom
? Lift the sliding bowl bottom in and out with the
tool,Handle with care to avoid damaging the
sealing edge,If the surface that seals against the
bowl hood needs improving,it can be adjusted by
turning provided that the sliding bowl bottom
does not have an anti-erosion lining.
? If an anti - erosion lining is provided,check that
it shows no traces of wear,To avoid permanent
erosion attacks against one and the same spots,
the lining should be loosened,turned by 5 - l0o,
and fastened again,
Bowl body
? The bowl body need not normally be removed
except for protective lubrication of the spindle
cone or for disassembly of the discharge
mechanism.
? The screws in the bottom of the bowl must be
unscrewed and removed before the lifting tool is
positioned,It is also advisable to knock off the
distributing ring with a drift,
Bowl body
? The bowl body is eased off the spindle cone with
the central screw of the lifting tool.
? Lubricate the nave opening,the nave and the top
of the spindle sparingly before mounting
the bowl body excessive
lubrication may cause the
bowl to slip,
Discharge mechanism
? When the bowl body is dismantled,it is
also advisable to dismantle the discharge
mechanism for lubrication
and for cleaning of the
passages and nozzle.
Discharge mechanism
? The operating slide is lifted by two of the spring
support screws,The slide must be handled with
great care,Skew and uneven insertion or removal
and the use of force lead in most cases to
deformation and consequently to breakdowns,
When placed in position the slide should be
lowered perfectly level,and it should then be
possible to lift it slightly by hand all the way
round,
Discharge mechanism
? Valve plugs,fastenings and valve seats should
not be removed except to be exchanged,The
nozzle in the bowl body and the passages should
be cleaned with special tools,or failing that with
a soft iron wire,Lubricate the outer edge surface
of the operating slide as well as the surface in the
bowl body over which the slide moves,Tighten
the spring support screws evenly and firmly,
Handling
Devices
5 Alfa – Laval
separator (II)
5.1
Inlet Bowl Outlet construction
5.1 Inlet,Bowl,Outlet
Figure 5.1
Cleaning,overhaul,lubrication.
? Satisfactory functioning cannot be ensured
unless the parts in contact with liquid are
carefully cleaned before assembly,This
applies particularly to seal rings,sliding
surfaces,guiding and contact surfaces,and
threads,Also take care that no burrs are
knocked up on the metal parts when
handling them,Follow the directions given
in chapter 5.4 and 4.5,
Exchange of parts
? Each bowl constitutes a balanced unit which will
get out of balance if any parts having an "*" added
to their part number in the general drawing are
exchanged without the bowl being rebalanced,To
prevent confusion of parts,for instance when a
plant consists of several machines of the same type,
these main parts are stamped either with the
complete manufacturing number or its three last
digits,
Guides
? When assembling make sure that the
parts are placed in the position defined
by the guides,Be careful not to
damage the guides when handling the
parts,
Seal rings,packings
Check seal rings and packings for defects
and make sure that the corresponding
grooves and sealing surfaces are well
cleaned.
After mounting check,the ring lies properly
(not twisted) in the groove and it fills the
groove evenly all around.
Threads,pressure in disc set
? Check the lock ring threads and the
pressure in the disc set at regular intervals-
see chapter 5.4,
Corrosion,erosion
? Aggressive liquids as well as liquids
containing very hard particles may cause
corrosion and erosion damage,If rapidly
growing or advanced damage is noticed
consult an ALFA-LAVAL/DE LAVAL
representative,
Bowl hood
? Lift the bowl hood off and on with the lifting tool.
To ease the hood off the bowl body,the central
screw of the tool is screwed down.
? If the hood does not engage on assembly,this
means that one of the locating pieces is out of
position - check this.
? The sealing ring at the lower edge of the hood
should not be removed except when being
exchanged–see Chapter Overhaul of Bowl,
Figure 5.2
Bowl insert parts
? The design of the insert parts determines whether
the bowl is of clarifier,purifier or concentrator
type,The bowl may be intended for one of these
processing methods or may be equipped and
balanced with parts for two of them so that either
can be chosen as needed,In the latter case it is
important that the bowl is correctly assembled
with the parts designed for the processing method
chosen,The exploded drawing shows how the
various insert pieces are assembled even when
the bowl is provided with alternative sets of parts.
Figure 5.3
Gravity disc
? For clarification,Use the gravity disc with
the smallest hole diameter "d".
? For purification,Use a gravity disc having
a suitable hole diameter in view of the
specific gravity ratio of the process liquid -
see chapter 5.2.
Level ring
If two level rings are delivered:
? For clarification or for purification with
"Regulation of interface by means of back
pressure regulation", the level ring with the
larger hole diameter "d" should be fitted in the
bowl.
? For purification with interface regulation by
means of the gravity disc only,the level ring with
the smaller hole diameter "d" should be fitted.
Distributor,Disc set
? Lift the distributor in and out with the
disc set on it,The center stud of the
lifting tool must be depressed in order
that the tool shall engage.
? Make sure that the discs are placed in the
correct order with No,l at the bottom,
Dismantling,assembly
? Dismantle and assemble the bowl with the
help of the special tools in the order
indicated by the exploded drawing,Place
the parts on a clean,soft surface.
? The bowl should rotate clockwise,The
principal components therefore have left-
hand threads where indicated in the text,
Lock rings
? The lock rings have left-hand threads and are
unscrewed clockwise,The large lock ring is
loosened by blows of a lead mallet or similar on
the handle of the spanner.
? Clean and lubricate the threads of the lock rings
and their contact surfaces with bowl hood and
bowl body before every assembly,Seizing may
be the result,especially in new machines,if this
lubrication is neglected or an unsuitable lubricant
is used,Careful lubrication of these surfaces will
prevent unnecessary wear on threads and contact
surfaces.
Lock rings
? Tighten the lock rings anti-clockwise - the small lock ring
until a tight seal is obtained and the large lock ring until
the bowl hood lies tightly against the bowl body.
? In a new bowl the marks ￠will now be in line with each
other,The lock ring should press the bowl hood against
the bowl body so that perfect sealing is obtained at the
seal ring and should also keep the distributor pressed
against the bottom of the bowl body,firmly clamping the
disc set,For final tightening it may thus be necessary to
hit the spanner handle with a lead mallet or similar (never
extend the spanner handle).
Cap nut
? The cap nut has a left-hand thread and is
unscrewed clockwise,Lubricate the thread
and contact surface before putting on,
Tighten the cap nut securely,
Sliding bowl bottom
? Lift the sliding bowl bottom in and out with the
tool,Handle with care to avoid damaging the
sealing edge,If the surface that seals against the
bowl hood needs improving,it can be adjusted by
turning provided that the sliding bowl bottom
does not have an anti-erosion lining.
? If an anti - erosion lining is provided,check that
it shows no traces of wear,To avoid permanent
erosion attacks against one and the same spots,
the lining should be loosened,turned by 5 - l0o,
and fastened again,
Bowl body
? The bowl body need not normally be removed
except for protective lubrication of the spindle
cone or for disassembly of the discharge
mechanism.
? The screws in the bottom of the bowl must be
unscrewed and removed before the lifting tool is
positioned,It is also advisable to knock off the
distributing ring with a drift,
Bowl body
? The bowl body is eased off the spindle cone with
the central screw of the lifting tool.
? Lubricate the nave opening,the nave and the top
of the spindle sparingly before mounting
the bowl body excessive
lubrication may cause the
bowl to slip,
Discharge mechanism
? When the bowl body is dismantled,it is
also advisable to dismantle the discharge
mechanism for lubrication
and for cleaning of the
passages and nozzle.
Discharge mechanism
? The operating slide is lifted by two of the spring
support screws,The slide must be handled with
great care,Skew and uneven insertion or removal
and the use of force lead in most cases to
deformation and consequently to breakdowns,
When placed in position the slide should be
lowered perfectly level,and it should then be
possible to lift it slightly by hand all the way
round,
Discharge mechanism
? Valve plugs,fastenings and valve seats should
not be removed except to be exchanged,The
nozzle in the bowl body and the passages should
be cleaned with special tools,or failing that with
a soft iron wire,Lubricate the outer edge surface
of the operating slide as well as the surface in the
bowl body over which the slide moves,Tighten
the spring support screws evenly and firmly,
