Ocea aquafilter backflush

AQUAFILTER AUTOMATIC BACKFLUSH FILTER TECHNOLOGY

OUR HISTORY

THE CHALLENGE

Ocea has developed and delivered reliable filters to water

Filters play a key role in processes in which clean water is

works and the maritime and aquaculture industries for

a quality factor. The challenge is to develop filters with

almost 30 years. The filters we supplied at the beginning

opti­mal functioning under all conditions. Varying pres-

of the 1980s are working as well today as when they were

sure and particle quantities can impact the effectiveness

delivered.

of the filter. It is also essential to maintain good control of the flow pattern in the filter so that the water used for self-

Aquafilter has been developed and produced all along

cleaning does not pollute the clean water. This require-

in Sykkylven, which is part of an industry cluster in

ment is particularly important, but also more demanding,

the Sunnmøre area in Western Norway. This is one of

when water with a high organic material content is being

the world’s leading maritime industry clusters. Close

filtered.

cooperation with several of the companies in this cluster, as well as unique expertise and extensive experience of

In processes where the available water pressure is low,

various types of water cleaning and water technology, have

such as on board a vessel pumping water, cleaning the

enabled us to develop new and environmentally-friendly

­filters is particularly demanding. In certain vessel types,

filter technology. This is the main reason we are one of the

low consumption of flush water is also important.

leading suppliers of self-cleaning pressure filters to the maritime and aquaculture industries.

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AQUAFILTER PURE TECHNOLOGY THE SOLUTION

DEVELOPMENT

Aquafilter satisfies the most stringent industry require-

We focus continuously on the further development of our

ments for water quality and effectiveness. The filter has

products and solutions. This developmental work is often

been developed to do the best possible job under low pres-

carried out in close cooperation with the industry, and our

sure and has new and patented backflushing technology,

newly developed Aquafilter is a result of such cooperation.

as well as specially developed filter elements for effective

Our backflush technology was first developed for wellboats.

filtering and the lowest possible loss of pressure. Smooth surfaces prevent particles from attaching. This means the

Wellboats are used to transport live fish in modern fish-

filter elements are quickly and effectively cleaned, a factor

farming, both out to the sea-cages and from the cages to

that increases the Aquafilter’s cleaning capacity.

the slaughterhouse. The water is often in a closed loop for protection of the environment. Wellboats have extremely

The filter’s large and open passages ensure the lowest

demanding filtration tasks. Organic material levels are

­possible loss of pressure. Aquafilter can self-clean at a

often high, whereas the water pressure on board is low.

pressure as low as 0.4 bar. Our patented backflushing

To meet our customers’ quality requirements, we have

­technology results in the internal water flow in the filter

developed a new, patented backflushing technology, as

creating a barrier between the filtered water and the water

well as the Optimize Backflush System (OBS).

used for cleaning. In this way, we achieve a homogenous filtration result even in extremely demanding applications.

The filter elements used in Aquafilter is also delivered with a new design, which has increased the water capacity by up

Our most advanced filter is supplied with OBS technology

to 30 per cent. The capacity and performance of Aquafilter

that monitors all pressure in the filter, as well as providing

is documented through extensive full-scale testing using a

the user with the possibility of adjusting different

high particle content in the test water.

operating parameters to optimise the filtration and backflushing process.

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AQUAFILTER FUTURE TECHNOLOGY FILTRATION BACKFLUSHING­ / SELF-CLEANING

OPTIMIZE BACKFLUSH SYSTEM (OBS)

A) THE FILTRATION PROCESS/NORMAL PHASE

The OBS technology which was developed for our Optimize

Unfiltered water enters the filter inlet and flows through

model is a tool that provides full control of all the important

the filter elements, where the conical profile of the filter

filter parameters. The pressure in all the filter chambers is

elements stops the particles and provides effective

continuously monitored, and the OBS technology works

filtration and water through-flow. Particles larger then the

continuously to maintain a pre-set pressure. The system

slot opening are separated from the water, and the filtrated

thereby ensures uniform and balanced flushing, even

water passes through passages designed for the lowest

under varying pressure and operating conditions.

possible pressure loss to the outlet. The single-directional flow pattern provides a stable and assured filtration result.

The technology also provides adjustment options, and users can individually adjust the flushing duration for

B) THE BACKFLUSH SEQUENCE

each filter element, or the pressure loss to be tolerated

The self-cleaning process starts up according to a pro­

before initiating the self-cleaning process. This facilitates

grammed pressure loss and/or at pre-set time intervals.

highly optimised processes.

The shape of the filter elements and the design of the filter provide a powerful flush that carries the particles

The OBS system can easily be adapted or integrated into

with it out of the filter’s out-flush system. The out-flush

other automation solutions, systems and designs.

valve opens when the backflush sequence is activated.

The water pressure will be higher on the outside of the

One of the most important advantages of the OBS

designated filter element, which is closed at the inlet. The

technology is the possibility of reducing the water

water pressure shows the water the ‘back route’ into the

quantity used to backflush the filter elements, as well as

designated filter element and flushes the particles that are

the optimisation possibilities the technology allows.

on the smooth inside of the filter element towards the outflush system.

The filter elements are cleaned individually so that the filter’s water flow is affected as little as possible by the backflush process (the self-cleaning process).

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A

B

NORMAL PHASE

FILTRATION Five separated filter elements for optimal filtration of the water.

BACKFLUSH SEQUENCE

BACKFLUSH

The filter element that is set to be backflushed is closed at the inlet.

The out-flush valve on the out-flush system is opened. The water pressure inside the filter element is lower than on the outside of the filter element. The water is flushing from the outside and into the element. Water and particles are carried out of the out-flush system.

BACKFLUSH OPEN

BACKFLUSH CLOSED

OUTLET FILTERED WATER

INLET WATER AND PARTICLES IN

OUTLET FILTERED WATER

INLET WATER AND PARTICLES IN

OUT FLUSH SYSTEM CLOSED

OUT FLUSH SYSTEM OPEN

INLET WATER AND PARTICLES IN

INLET CLOSED

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AQUAFILTER / STANDARD Aquafilter with backflush technology is our latest addition to our series of self-cleaning pressure filters for fresh water and sea water. The self-cleaning process is carried out without affecting the operation of the filter. The cleaning process is controlled by the pressure difference and/or time intervals. Our Standard model is used in environments where the quantity of water for self-cleaning is of little significance, as the flushing continues until a predetermined acceptable/pre-set pressure difference is achieved. Standard filters are supplied with a preprogrammed control cabinet. All filter alarm functions can be connected to existing alarm and monitoring systems.

AQUAFILTER / POSITION This filter is used where the quantity of flushing water is of significance. The filter is well-suited to situations where there are stable operating conditions. In the self-cleaning process, it is possible to flush directly into the filter elements, due to our CANbus-controlled filter motor. Flushing of water from the self-cleaning process takes place only when full backflushing of the filter elements is possible. The flushing is synchronised, and each individual internal filter element is backflushed in accordance with the programmed intervals. Position filters are supplied with a pre-programmed control cabinet. All filter alarm functions can be connected to existing alarm and monitoring systems.

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INLET

MP OUTLET

2

MP

4

1A 3

1B

1

OPERATING MOTOR

A STANDARD MODEL: PLS-controlled three-phase motor. Continuous flushing 360°.

FILTER HOUSING MATERIAL

High-density polyethylen (HDPE), A non-corrosive, non-toxic material.

HDPE has high resistance to abrasion and chemicals.

No maintenance requirements!

OUT­- FLUSH SYSTEM

STANDARD MODEL: Flushing throughout the self-cleaning sequence.

DIFFERENTIAL PRESSURE PRESSOSTAT (DP)

Differential pressure pressostat (DP) with measuring points (MP) at the inlet chamber and the discharge chamber after filtration.

Start and stop of flushing sequence.

Activation of alarm function.

B POSITION / OPTIMIZE MODEL: PLS and CANbus-controlled filter motor with exact positioning and feedback.

Programmable intervals.

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3

POSITION / OPTIMIZE MODEL: Discharge of flushing water only when full backflushing of the filter element is possible. Discharge is shut automatically when the flushing function is moved to the next filter element.

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AQUAFILTER / OPTIMIZE Optimize is our technological flagship. The filter is equipped with OBS technology, which controls and monitors factors such as time, pressure and pressure difference. These parameters are programmed based on the user’s needs and specifications.

This technology makes the operation more efficient and significantly reduces the quantity of flushing water used in the self-cleaning process.

A local touch display provides full visibility of the water pressure in all three chambers as well as a good overview of the operating status (motor data and flushing status) of the filter a all times. Flushing time can easily be adjusted, directly on the touch screen, and flushing status signals are available as standard for information to external alarm or control systems.

Other information to external systems and remote display can be provided on order.

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2

2

1

2

4

3

1

FILTER ELEMENTS

Multiple cylinder-shaped filter elements of wedge wire with discontinuous axial slots. The wedge wire consists of a V-shaped surface profile that creates conical slots.

Advantages: non-clogging, easily cleaned by backflushing and low pressure drop.

PRESSURE METERS

Pressure meters that continuously monitor the pressure in the three filter chambers K1= Inlet pressure K2= Outlet, discharge chamber after the filter elements/filtration K3= Pressure in the out-flush chamber

CONTROL CABINET

Control cabinet with touch display providing complete information about the filter parameters and operation. The control cabinet is supplied with pre-set values. All the important parameters can easily be programmed and changed here – such as times and pressure, and thus also pressure differences. PLS-controlled flushing process and monitoring of the filter.

OUT-FLUSH SYSTEM

The out-flush valve is adjusted by an actuator with a digital electro-pneumatic positioner. The out-flush system is connected to, and controlled by, the OBS system.

Water consumption for flushing of Optimize: approximately 8% of the filtration volume in the same sequence as the backflushing sequence. Default value 8 seconds.

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3

4

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AQUAFILTER CAPASITY Model

In-/Outlet

AF250-100 BF

DN100-125

AF300-150BF

DN150-180

AF355-200BF

DN200-225

AF450-250BF

DN250-280

AF500-300BF

DN300-315

AF560-350BF

DN 350-355

AF600-400BF

DN400-400

AF800-500BF

DN500-500

AF900-600BF

DN600-630

AF1200-700BF

DN700-710

Grade of filtration [mµ]

Capasity [m³/h]

H1 [mm]

300 150 40 300 150 40 300

155 155 65 350 350 110 550

150 40 300 150 40 300 150 40 300

490 150 850 790 240 1070 850 260 1360

150 40 300 150 40 300 150 40 300 150

1240 380 1730 1320 400 2700 2400 720 4300 3500

40 300 150 40

1100 7200 4600 1500

Weight [kg]

Footprint [m²]

890

35

0,1

960

48

0,15

1090

76

0,19

1250

125

0,31

1320

158

0,38

1580

237

0,48

1660

332

0,61

2300

575

0,8

2950

907

1,05

2800

2150

1,74

Capasities can be adjusted by changing limiting faactors such as dimension of inlet/outlet etc. All data in the tabel can be changed without notice.

Modell

Aquafilter backflush

Area of application:

Water*

Maximum flow rate at 500 μm

7200 m³/h

Filter fineness:

20 µm - 5 mm

Filter elements:

Cylinder with discontinuous axial slots

Maximum operating pressure

3 bar**

Minimum self-cleaning pressure

0.4 bar***

Housing material:

HDPE

Backflushing medium:

Filtrate fluid

Activation of backflush system:

Function of time or differential pressure

Connections:

Flange connections PN 10

Slot tube material:

Stainless steel or duplex

Filter motor:

Position/Optimize positioned torque motor

Out-flush valve:

Butterfly valve

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H1 FOOTPRINT OUTLET *

Maximum temperature 50°C

** Higher pressure versions on request *** With low water pressure a pump can be mounted before the out-flush valve.

INLET

AF 1200 7200 m3

4300 m3

AF 900

AF 250

AF 300

155 m3 350 m3

AF 355

550 m3

850 m3 2700 m3

AF 450

AF 800 1070 m3

AF 500

1730 m3 1360 m3

AF 560

AF 600

CAPASITY OF FILTRATION AQUAFILTER BACKFLUSH Grade of filtration: 300 mµ

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FOTO: HELGE BJORDAL, NAGELLD AS, SCANPIX /C&P, iSTOCK HAVNEVIK

AQUAFILTER PURE TECHNOLOGY LOW WATER PRESSURE MINIMUM PRESSURE LOSS WATER SAVING SYSTEM

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