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Automatic filters for fuel and lubricating oil

Automatic filters for fuel and lubricating oil
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Automatic filters for fuel and lubricating oil - 1

Automatic filters for fuel and lubricating oil Technical information for oil filtration

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This technical handbook provides an insight into filtration technology in general and the Alfa Laval automatic filters in particular. 11 The Alfa Laval filter 14 Innovations Automatic filter with integrated centrifuge Fuel oil filter - F-152 range Lube oil filter - 350 range 20 Lubricating oil filtration 24 Fuel oil filtration

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Automatic filters for fuel and lubricating oil - 4

Alfa Laval automatic filters

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Automatic filters for fuel and lubricating oil - 5

Alfa Laval automatic filters Summary Alfa Laval’s application leadership, in separation, heat exchange, and fluid handling combined with the unique expertise in automatic filtration, enables the offering of a range of automatic filters with continuous and reliable protection of the engine at lower overall lifecycle cost. Alfa Laval offers a range of automatic filters that provide full flow filtration of fuel and lubricating oils. Used in conjunction with a centrifugal separator as part of a complete lubricating oil system or fuel oil treatment system, these filters effectively separate...

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Alfa Laval automatic filters Background The filter, in a mineral oil treatment system for diesel engines, is installed primarily for preventing particles in the oil from entering the engine. Hence, the filter should be placed as close to the engine as possible, whether it is operating as a fuel oil or lubricating oil filter. The centrifugal separator, on the other hand, cleans the oil and removes the water. For these reasons, both the separatorand the filter are required in a modern mineral oil cleaning system. The main difference between a filter and a centrifugal sepa rator is that a...

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Alfa Laval automatic filters Filtration theory Filtration can be defined as the process of collecting solid particles from a fluid by passing the fluid through a filter medium (which could be a filter screen or a paper element) where the particles are retained. Two basic methods of filtration are used: 1. Surface filtration, used in strainers and cake filters. 2. Deep-bed filtration, used in depth filters. Fluid with solid particles Filter medium The principles of particle collection in surface filtration and deep-bed filtration are entirely different. In surface filtration the particles...

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Alfa Laval automatic filters Figure 4. Examples of particle shapes. Due to the different screen configurations, comparisons of given filter finenesses on different filter screens with one another are of doubtful value. The advantage of using a surface filter, rather than a depth filter, is that the filter screens can be cleaned, thus the filter can be reused. If the filter is backflushed continuously, the pressure drop across the filter will remain constant. In practice, a filter can be retained in operation without interruption, provided that the backflushing is a part of the filter...

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Alfa Laval automatic filters Figure 7. Definition of “absolute filter fineness”. (d) and differential pressure across the filter (Ap) is found to be (K = a constant depending on the permeability of the bed) The formula describing this relationship, Darcy's basic filtration equation, is named after the man who formulated it. This formula is valid when the differential pressure through the filter cake is low and the main pressure drop occurs across the filter medium itself, i.e., when the filter medium is fairly clean. In these circumstances, the filtrate flow through each square opening in...

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Alfa Laval automatic filters Hydraulic motor Filtered oil to hydraulic motor Drain cock Diversion chamber Full-flow chamber Figure 9. Automatic lubricating oil filter with diversion chamber.

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Automatic filters for fuel and lubricating oil - 11

Alfa Laval automatic filters The Alfa Laval filter Design and operating principle The Alfa Laval automatic filters are designed specifically for full-flow filtering of fuel and lubricating oils for trunk piston and crosshead engines. Design The Alfa Laval filter consists of: • The filter housing. • The filtering unit and distributor. • The hydraulic motor. The filter housing for the automatic filter can have one or two chambers. The first chamber, where the cleaning of the oil occurs, is called the full-flow chamber. The second chamber, where the impurities stopped by the full-flow chamber...

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Alfa Laval automatic filters The filtering unit and distributor are placed in the filter housing, which, for the automatic filters with filtration of the backflushingoil, forms two filter chambers: • The full-flow chamber with full-flow filter elements, where the harmful solids are removed from the oil flowing towards the engine. • The diversion chamber with diversion filter elements, where the backflushed oil is filtered and the solids will be concentrated and removed from the oil system by periodic draining. The distributor is rotated by the hydraulic motor, which in turn is driven by a...

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Automatic filters for fuel and lubricating oil - 13

Alfa Laval automatic filters Operating principle, automatic filter with diversion chamber The operating principle of an automatic filter is explained below. (The capital letters in the text refer to Figure 14.) Filtering in the full-flow chamber 1. Unfiltered oil enters the full-flow chamber of the filter at “A” and flows into chamber “B” - the space between the distributor “C” and the inner perimeter of the sleeve where the filter elements “D” are fitted. 2. From chamber “B” the oil is distributed into and through the filtering columns formed by elements “D”. The solids present are...

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Automatic filters for fuel and lubricating oil - 14

Alfa Laval automatic filters Alfa Laval offers a complete range of automatic fuel and lube oil filters for trunk piston and cross head engines in the size from 500–100,000 kW. Automatic filter with integrated centrifuge Customized solutions. In addition to the standard products range Alfa Laval offers customized solutions, with an interface and housing designed to meet the specific demands of the engine manufacturer. Design The Alfa Laval “Eliminator” filter consists of: • The filter housing. • The filtering unit and distributor. • The hydraulic motor. • The centrifuge. The first chamber,...

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