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Natural gas and air applications tend to have a low operating pressure, so proper sizing to reduce a pressure drop from inlet to outlet is important. FAQs How should I install my strainer?
The chart below is a handy resource to help convert from mesh to micron (or vice-versa). Mesh Screen Where dirty steam may cause rejection of a product or process batch due to staining or visible particle retention. When basket type strainers are used on steam systems, a significant amount of condensate may be formed. Consequently, strainers designed for use in steam systems usually have a drain plug, which can be fitted with a steam trap to remove the condensate. Although there are exceptions, size for size, Y-type strainers have a lower dirt holding capacity than basket strainers, which means that they require more frequent cleaning. On steam systems, this is generally not a problem, except where high levels of rust are present, or immediately after commissioning when large amounts of debris can be introduced. On applications where significant amounts of debris are expected, a blowdown valve can usually be fitted in the strainer cap, which enables the strainer to use the pressure of the steam to be cleaned, and without having to shut down the plant. These are relatively coarse screens and hole sizes typically range from 0.8 mm to 3.2 mm. Consequently, perforated screens are only suitable for removing general pipe debris.
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Basket strainers are also available in duplex styles as well as the standard singlex variants. Duplex basket strainers do not require shut-off when they become clogged or need to be cleaned. This means that they can be serviced without interrupting the flow of process fluids. As such, a duplex basket strainer would be prefered for continuous flow applications wherever businesses require systems to run without any downtime. It is advised that two gate valves are fitted to either side of this unit, ensuring all water is shut off when the baskets are being emptyed (1.5″ Valterra gate valves fit directly into the inlet and outlets)
As its name implies, a Y strainer is shaped like a Y and is used to filter or strain out particulates from steam, gas, or liquid. This mechanical straining process is possible because of a filter element composed of mesh, perforated metal, or a wedge wire straining element. The most common kind of straining element is a wire mesh. Some also include blow-off valves that make the cleaning process easier in applications with more substantial dirt. Sizing the mesh filter for a Y strainer Y strainers have an arrow from inlet to outlet. It is important to install them in this orientation for proper filtration. What kind of end connections are available?
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These are formed by punching a large number of holes in a flat sheet of the required material using a multiple punch. The perforated sheet is then rolled into a tube and spot welded together. Basket type strainers can only be installed in horizontal pipelines, and for larger, heavier basket strainers, the base of the strainer needs to be supported.
Used whenever high flow capacities are required, basket strainers are serviced by removing the cover. This will provide access to the basket which can then be removed, cleaned and replaced as required. Why you might consider using a duplex basket strainer Basket strainers are used in a vast range of applications where flow can be interrupted to allow the removal of the basket for periodic cleaning. They are usually mounted horizontally into the pipeline, however on fabricated units, line connections can be orientated to suit customer requirements. Minor modifications can also be made to enable the installation into downward flow vertical pipelines. Select the housing material based on the application's environment. To do this, it's necessary to understand the chemical resistances of the materials. Are Y strainers affordable?BM Engineering Supplies is the leading Scottish distributor of both simplex and duplex inline filter strainers, including cast iron basket strainers and stainless steel Y-strainers.
Depending on your needs, Y filters can include a variety of end connections, including flanged, threaded and welded. You can also find special flanges, such as ring joints. What kind of housing material should I choose? A Y strainer cannot function properly without a properly sized mesh filter. There are two terms that describe the size of the openings in the strainer through which debris passes. One is micron and the other is mesh size. Though these are two different measurements, they describe the same thing. What is a micron? The basket type or pot type strainer is characterised by a vertically orientated chamber, typically larger than that of a Y-type strainer. Size for size, the pressure drop across a basket strainer is less than that across the Y-type as it has a greater free straining area, which makes the basket type strainer the preferred type for liquid applications. As the dirt holding capacity is also greater than in Y-type strainers, the basket type strainer is also used on larger diameter steam pipelines. Liquid applications tend to become infiltrated by sand and gravel, and Y strainers can help keep those particles out to ensure the liquid stays clean. Especially when they work in tandem with other water-handling applications, these strainers can protect important (and expensive) equipment from damage, corrosion, or clogs that could result from such contamination. Natural gas and air applications Whilst strainers remove all visible particles in the steam, it is sometimes necessary to remove smaller particles, for example, in the following applications:
Fine wire is formed into a grid or mesh arrangement. This is then commonly layered over a perforated screen, which acts as a support cage for the mesh.
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