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Strainer materials should reflect the materials specified for the pipeline. This information is provided in the relevant piping class which normally also provides details on the relevant Material Data Sheet (MDS). It is standard practice for the MDS requirements to cover pressure retaining parts such as the strainer body and cover, but not items such as the strainer element. The element material should be of similar, or better, material standard to the body. Directives and CE Marking The oil filter analysis carried out by Fil filters shows that the oil filter was at 88% capacity in just over 1000 miles of operation and if it had not been replaced, potential engine failure was probable. I have borrowed a car that I can keep for a few weeks if necessary do can hold out on this until I get some real help with the repair.
The trend is that some of the vehicle manufacturers are using engines with a “belt in oil” system. The main reason behind this is because this system is more efficient (up to 30% more efficient compared with a chain system) and therefore helps to reduce vehicle emissions. Other advantages to take into consideration are: we can use a narrower belt and therefore gain more room in the engine bay; belts do not stretch unlike chains so engine timing will not alter; the system is quiet in operation with the added advantage that the Belt in Oil system is lighter compared to a timing chain system. Furthermore, "carbon" from the injector would be expelled out of the exhaust valve, it would not bypass the piston rings and find its way into the sump -- unless one or more rings had broken and damaged the piston & cylinder bore, in which case it's straightforward engine failure and the warranty should pay up. The common purpose of a strainer is to remove debris from a process stream. Strainer elements are available with a range of filtration sizes from as large as 10mm perforations down to 25 micron (0.025mm) fine woven wire mesh. Correct selection of the filtration size is very important and should relate to the maximum particle size that downstream equipment (eg. pumps) is capable of handling. Strainers are designed to remove large contaminants (defined as 40-microns or greater) from the material being processed. The ratio of mesh to microns changes depending on the number of gaps within one linear inch. For example, 60-mesh strainers typically catch particles around 240-microns, and 100-mesh strainers catch particles sized at 150-microns.
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A sedimentation or gravity bed filter allows contaminants heavier than oil to settle to the bottom of a container under the influence of gravity. Fleet Maintenance magazine on Purolator history". Webcitation.org. Archived from the original on February 24, 2009 . Retrieved 2013-01-07. If the filtration size is too large then escaping debris could seriously affect the performance of downstream equipment. A filtration size that is too small could result in increased maintenance to clean the strainer and/or increased pressure drop, which can be detrimental to the downstream process. Strainer Mesh Comparison Guide The following information is fundamental to ensure the correct specification of strainer equipment for its intended purpose. Filtration Size Strainers are employed to capture much larger contaminants. By larger, this refers to objects of approximately 40 microns or greater. A 60-mesh strainer captures contaminants at around a 240-micron level, while a 100-mesh strainer captures at a 150-micron level. The mesh-to-micron particle size correlation is determined by the number of open square-shaped gaps across one linear inch.
While strainers are used to remove larger particles, filters are used to remove smaller unwanted particles from both liquids and gasses. Filters are typically used when the liquid or gas passing through the system must be free of most contaminants, even those as small as a grain of sand. Many filters are reusable, while others must be replaced periodically. Strainers fall into the category of equipment that is covered by the Pressure Equipment Directive (PED). Equipment may be subject to CE Marking requirements in line with the guidelines presented by the PED. The fluid and size/volume of the strainer will determine as to whether CE Marking is required or not. Russell W. knize (2008-02-19). "Dissective oil filter analysis". Knizefamily.net . Retrieved 2013-01-07. Early automobile engines did not have oil filters, having only a rudimentary mesh sieve placed at the oil pump intake. Consequently, along with the generally low quality of oil available, very frequent oil changes were required. The Purolator oil filter was the first oil filter for the automobile; it revolutionized the filtration industry, and is still in production today. [1] The Purolator was a bypass filter, whereby most of the oil was pumped from the oil sump directly to the engine's working parts, while a smaller proportion of the oil was sent through the filter via a second flow path, filtering the oil over time. [2] Bypass and full-flow [ edit ] Full-flow [ edit ] Deciding how clean the oil needs to be is important as cost increases rapidly with cleanliness. Having determined the optimum target cleanliness level for a contamination control programme, many engineers are then challenged by the process of optimizing the location of the filter. To ensure effective solid particle ingression balance, the engineer must consider various elements such as whether the filter will be for protection or for contamination control, ease of access for maintenance, and the performance of the unit being considered to meet the challenges of the target set. [14] See also [ edit ]What is the difference between an oil filter and a strainer? Do they have different applications? When should each be utilized?" High efficiency oil filters are a type of bypass filter that are claimed to allow extended oil drain intervals. [5] HE oil filters typically have pore sizes of 3 micrometres, which studies have shown reduce engine wear. [12] Some fleets have been able to increase their drain intervals up to 5-10 times. [13] Filter placement in an oil system [ edit ] Additionally, the size and configuration of your pipeline is important also. Some strainers and filters can only be installed horizontally, while others function best in a vertical housing. The Differences between Strainers and Filters
In most cases, strainers are seen in suction lines into a pump. If suction pressure (toward a vacuum) is increased due to flow restriction, it can result in pump damage via cavitation.Another key difference between filters and strainers is the pressure of the gas or liquid as it passes through the medium. Liquid passing through a strainer will likely not see a drop in pressure as it passes through. If there is a drop in pressure, however, it might indicate that the strainer needs to be cleaned or removed. On the contrary, liquid or gas passing through a filter will likely experience a noticeable drop in pressure. Factors to Consider when Choosing a Strainer or Filter Staley,David R. "Correlating Lube Filtration Efficiencies with Engine Wear, SAE technical paper 881825" 1988>
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