Alfa Laval Separator Equipment - Marine Oil Separator - Hi-sea

Alfa Laval Separator Equipment

Alfa Laval Separator Equipment

1. Alfa Laval Separator Equipment Application
The Alfa Laval separator equipment is intended for marine and land applications. It is specifically designed for cleaning of mineral oils from water and solid particles (sludge). The cleaned oil is discharged continuously, while the sludge is discharged at intervals.
The separator handles the following types of lubricating oils and low viscosity fuel oils:
Distillate  (viscosity 1.5-5.5 cSt/40℃)
Marine diesel oil  (viscosity l3 cSt/40℃)
Intermediate fuel oil and heavy fuel oil  (viscosity 30-380 cSt/50℃)
Lubricating oil of R & O type, detergent or steam turbine.
The separator can be operated either as a purifier or as a clarifier. When operated as a purifier the separator discharges the separated water continuously.
When the oil contains only small amounts of water the separator is operated as a clarifier, discharging the water together with the solid particles.
The separator has to be installed together with devices for control of its operation.
2. Structure and Transmission of Alfa Laval Separator Equipment
The oil separator mainly consists of mechanical transmission, bowl, control valve, oil transfer system, frame, sewage draining passage and so on.
(1) Mechanical transmission
Mechanisms of centrifugal friction coupling, speeding-increasing helical gear unit, lubricating oil tank, radial or axial buffer spring unit, speed counter and oil pump driving gear and so on are installed in the frame.
The electromotor drives the horizontal shaft through the friction coupling. The big helical gear on the horizontal shaft drives the small helical gear on the vertical shaft, thus a pair of gearing-up is formed with an increasing speed ratio of 11:56. The worm on the right side of the big helical gear drives the small worm gear of the speed counter, thus a pair of gearing-down is formed with a reduction ratio of 12:1, so when the rotate speed of the speed counter is 120±5r/min, the oil separator reaches the top speed. The transmitting gear on the right side of the horizontal shaft drives the oil pump.
A group of radial buffer springs, which has been pressure-deformation tested, are installed on the vertical shaft to absorb the radial vibration from the high-speed bowl.
This group of springs has past the pressure and deformation testing. When the same group of springs that installed in the separator are compressed to the same regulated length, the differential pressures of the springs in a same group installed in the machine is within 49N at the same specific pressed length, so all the springs in a same group should be changed if one of them is broken.
Another buffer spring is installed at the end of the vertical shaft to absorb the vibration form the helical drive.
(2) Friction coupling
The centrifugal friction coupling ensures the oil separator start up tardily to reduce the startup load of the electrical motor.
When the separator is being started up, the friction coupling gets heating and smoking. When the separator is being stopped, the friction coupling sends out short clank. These are all normal phenomena. When the startup is completed, the bowl reaches the normal rotation speed, the friction coupling stops heating and gradually cools to room temperature.
The friction surface of the parabolic cylinder block of the friction coupling should be prevented from being interfused with oil, grease lubricant and other substance, otherwise, slipping will be caused, and the bowl can not reach the full speed.
(3) Oil transfer pump
The self-attached gear pump of the separator is driven by the transmission gear at the right side of the horizontal shaft. There is a relief valve on the oil pump which regulates the working pressure as 0.3 Mpa, when the maximum pressure exceeds this pressure, the safety valve will be open, then the oil transmission amount is then reduced. A filter should be set on the inlet pipeline of the oil pump so as to prevent large granule getting into the oil pump and causing jam.
In order to prevent the noise made by the dry friction of gears when starting up the separator or draining the sewage, and to prevent the work life being shortened, by-pass pipelines can be added in the suction pipe of the dirty sludge oil pump, connect the exhaust port to the suction port of the dirty sludge oil pump. By this way, the oil pump will not make dry frication when starting up and draining the impurity, the noise will be reduced and the work life of the pump will be prolonged.
(4) Braking device
A brake is installed on the base of the oil separator, when the oil separator can not work normally and needs to be stopped, the braking device can be activated to shorten the shut-down period after the power supply is cut off.
The braking device can also be used in normal shutting-down, but it must be used after the slowdown of the rotation speed of the oil separator, otherwise the friction disk will be burnt out and worn.
(5) Bowl
The bowl is one of the most important components of the oil separator. The separating of the liquids is implemented in the bowl.
The bowl mainly consists of components such as: bowl body, disc, reel, end cover, main locking ring, gravity lock ring, etc.
The bowl has been dynamical balanced. Every main component after the dynamical balance is marked. When the bowl is assembled for the second time, it is forbidden to change the components, and the bowl should be assembled in strict corresponding to the original assembling marks. In addition, the weight-adjusting part on the head cover and the drum body can not be changed. When more than one oil separator with the same mode is to be assembled, more precaution should be taken to ensure components of one bowl will not be fixed onto another one. Otherwise the balance of the bowl will be destroyed, strong vibration will occur when the oil separators work.
3. Alfa Laval Separator Equipment Technical Parameter
The technical parameter is optional, we can accommodate your requirements, please don’t hesitate to contact us!

Maximum density





Power consumption


0.9 kW

running (at max. capacity)

2.0 kW

max. power consumption

2.8 kW (at starting-up)

Bowl speed,



rev/min. 50Hz/60Hz

Motor speed, synchronous


rev/min. 50Hz/60Hz

Gear ratio (pulleys)

130:41 (50 Hz)

106:41 (60 Hz)

Starting time

3.5 – 4.5 minutes

Stopping time

Running down without brake

average 19 minutes

With brake

min. 3 max. 4 minutes

Maximum running time without

Empty bowl

180 minutes


Filled bowl

180 minutes

Sludge volume total/efficient

1.0 / 0.3 litres

Bowl liquid volume

2.2 litre

Bowl inner diameter, max

218 mm

Fixed discharge volume

1.2 + 0.1 litres

Lubricating oil volume

0.5 litre

Sound pressure level

75 dB(A)

Sound power

8.9 Bel(A)

Vibration level

New separator

Max. 5.6 mm/sec

Separator in use

Max. 9 mm/sec


Separator without motor

Net weight approx. 193 kg


21 kg

Complete bowl

37 kg

Motor power

3 Kw

4. Certificates of Alfa Laval Separator Equipment: CCS, BV.

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