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ALF - Alfa Laval Filter

ALF - Alfa Laval Filter
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ALF - Alfa Laval Filter Filtration for cooling systems using low-quality water The use of inexpensive secondary cooling water from locations such as the sea, lakes or rivers has become a successful cooling solution that is now widely accepted in industry. Secondary cooling is in widespread use on ships, in power plants and in district heating and cooling systems. However, such installations require large quantities of clean cooling water. With the supply of high-quality cooling water diminishing, the need for cost-effective solutions to eliminate clogging, fouling and corrosion has become increasingly more apparent. In a cooling system incorporating a heat exchanger and an Alfa Laval Filter, even polluted or corrosive water can be used to cool the most sensitive process equipment. The Alfa Laval Filter (ALF) operates as an integral part of a cooling system, to remove debris that can foul and clog plate heat exchangers, tubular condensers, cooling tower spray nozzles or any similar equipment. In spite of effective screening at the water intake, mussels, seaweed and other forms of marine life can settle on the heat transfer surfaces. Conditions are ideal for the growth of these forms of life and, as a result, they multiply rapidly. This then causes less effective heat transfer and even the complete breakdown of heat exchangers or other equipment. If these kinds of blockages are severe, measures such as pesticides or chlorination are often no longer sufficient. In some cases, these simply cannot be used because they are prohibited by environmental legislation. This is where Alfa Laval Filter technology comes in. It protects a wide range of sensitive equipment from clogging and fouling, and also prevents blockages in the cooling water system. An Alfa Laval Filter removes debris and marine life, and is automatically backflushed at regular intervals to keep it clean. Standard control panel with PLC for one filter. Alternative configurations are available for controlling multiple filters.Options for remote control or high protection classes, such as ATEX, are also available.

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Operation and design The Alfa Laval Filter is a pressure filter with an automatic flushing arrangement. The design features a pressure vessel casing made of stainless steel (ALF-S), fibreglass reinforced polyester (ALF-P) or rubber-lined carbon steel (ALF-R). The internal cylindrical filter basket, along with other wetted parts, is usually made of stainless steel, super stainless steel (SMO) or titanium. The filter system is available with connections ranging from 100 mm/4” to 800 mm/32” and is designed for placing directly in the pipe system. Because the automatic regeneration process is...

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mounted close to the heat exchanger(s) in order to minimize the risk of biological growth in the pipe system connecting the components. Installation ALF units can be installed upstream of heat exchangers with shut-off valves placed upstream of the filter and downstream of the heat exchanger. This enables flexible servicing if many units are installed in parallel– for instance in a duty/standby installation or when installed on a bypass pipe, allowing the filter to be taken out of service separately. Due to the flexible nozzle orientation, ALF filters can be installed in almost any position,...

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Pressure drop Pressure drop for Alfa Laval Filters Flow rate Fig. 3 Recommended pressure drop and capacity range Technical data Pneumatic, electric or hydraulic Actuator controlled valves Mesh size Perforated plate design (0 hole) Wedge wire design (slot size) Filter body (ALF-R) Rubber-lined carbon steel (EN P265 GH/ASTM A516 Gr60) Filter body (ALF-S) Stainless steel EN 1.4404 ASTM 316 Filter body (ALF-P) Fibreglass reinforced polyester (GRP/FRP) Internal parts (wetted) Stainless steel EN 1.4404 ASTM 316 Internal parts (wetted) Super stainless steel, EN 1.4547 / ASTM S31254 (SMO) Internal...

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ALF - Alfa Laval Filter 4Pages

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ALF - Alfa Laval Filter
4Pages