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Alfa laval
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The S Separator
Chapter 5. bowl function
Bowl function
Chapter 5. bowl function
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Chapter 5. bowl function
What happens inside?
• Operates with the Alcap principle, thus no gravity disc
• No level ring
• Centrishoot
– Complete displacement
– Complete ejection
– Clean bowl!
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Chapter 5. bowl function
Paring tube
CentriLock
Dischargeslide
Seal ring
NozzleOperatingwater ring
Inlet pipe
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Chapter 5. bowl function
ActivitySnap ring (Centrilock™)
Bowl hood
Hood seal/o-ring
Top disc
O-rings
Inlet / outlet pipe
Paring tube
Bowl discs
Distributor
Cap nutNut
Discharge slide
Seal ring
O-ring
Bowl body
O-ringO-ring
Operating slide
O-ring
Operating slide holder
Operating water ring
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Chapter 5. bowl function
Bowl inlet and outlets
Water outlet
Inlet
Oil outlet
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Chapter 5. bowl function
question
• Which other separator for marine and power use has the oil paring disc inside the top of the disc stack?
MSPX
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Chapter 5. bowl function
question
• No level ring!
• Why has the level ring been removed?
A level ring is not necessary in this separator design .
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Chapter 5. bowl function
• Why has the water paring disc been replaced by a paring tube?
question
To avoid generation of heat in separator top
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Chapter 5. bowl function
Product flow• 1. Alcap
– Valve V 5 normally closed
Conditioning water2. Oil flow
InletParing chamber
3.Water / Sludge4. Paringtube position
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Chapter 5. bowl function
Inside the bowl at discharge -1• Dirty oil in
– Interface / separated sludge
• If back pressure increased?
– Oil level inwards
– Interface outwards
– Water level inwards
– Paring tube inwards
• If back pressure decreased?
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Chapter 5. bowl function
Inside the bowl at discharge -2
• Feed off
• Oil level
• Water level
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Chapter 5. bowl function
Inside the bowl at discharge -3
• 1 - Water outlet closed
• 2 - Oil outlet closed
– opened at pressure increase signal from PT4 in oil outlet.
• 3 - Oil displaced
– Displacement volume based on calibration of water flow at first start-up.
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Chapter 5. bowl function
Inside the bowl at discharge -4
• Displacement continues
• Paring tube moves in
– Oil column replaced by water - heavier
• Complete displacement
• Tube flush
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Chapter 5. bowl function
Inside the bowl at discharge -5
• After discharge
• Empty bowl
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Chapter 5. bowl function
Inside the bowl at discharge -6
• Conditioning water is added , time is depending on calibration made at first start-up
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Chapter 5. bowl function
Inside the bowl at discharge -7
• After conditioning water
• Top disc well covered
• Water does not reach disc stack
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Chapter 5. bowl function
Inside the bowl at discharge -8
• Feed on
• Water pushed out
• Oil does not pass top disk
• Bowl in running condition
Inside the bowl at discharge -8
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Chapter 5. bowl function
Activity
• Using your notes, describe sequence at discharge to person next to you!
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Chapter 5. bowl function
Oil/water back pressure, tube position, Appendix 4
• Previous separator models
– Increase oil back pressure increases water pressure
– FOPX, water indicating pressure increases when recirc holes in heavy phase paring disc become blocked
• Separation unit
– when oil pressure is increased the water pressure decreases
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Chapter 5. bowl function
Oil/water back pressure, tube position, Appendix 4
• Paring tube
– free to move between inner and outer limits
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Chapter 5. bowl function
Oil/water back pressure, tube position, Appendix 4
• Water paring chamber
– Low oil back pressure
– gives a large diameter water ring
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Chapter 5. bowl function
Oil/water back pressure, tube position, Appendix 4
• Water paring chamber
– High oil back pressure
– gives a small diameter water ring
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Chapter 5. bowl function
Oil/water back pressure, tube position, Appendix 4
• Paring tube position
– large diameter gives high pressure
– tube out gives high pressure
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Chapter 5. bowl function
Oil/water back pressure, tube position, Appendix 4
• Paring tube position
– small diameter gives low pressure
– tube in gives low pressure
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Chapter 5. bowl function
The operating mechanism• QUESTION, how do we push the operating slide against the bowl body
when there are no springs in the bowl?
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Chapter 5. bowl function
The operating mechanism
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Chapter 5. bowl function
The operating mechanism
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Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
www.alfalaval.com
Chapter 5. bowl function
The operating mechanism
