Straining is a coarse filtration procedure commonly used to remove particulate matter from a flowing liquid. One can compare the process to the action of the metal grill found in a kitchen sink, where its function is to prevent food particles from clogging up the waste pipe. Similar devices are employed in many industries, although these are considerably larger and more intricate than the domestic example. One of the more widely used industrial types is the Y strainer, so-named because its shape roughly resembles the lowercase letter. It should not be confused with the basket or T strainer, as its design renders it less versatile. Nevertheless, both types have pros and cons, which determine their suitability for a given task.
Despite their noticeable physical differences, the two devices share a common purpose. Like the metal sink grill, their job is to prevent blockages, albeit on an industrial scale. More precisely, they form inline components of a pipeline system. Rigid metal housings provide the characteristic shapes of the Y strainer and the T-shaped alternative device. Inside each is a metal screen or basket that acts as a coarse filter. The design of those screens will also govern the type of application for which each is best suited.
Irrespective of their shape, strainers are installed near the start of a pipeline, often just before the intake side of a pump. Without them, any large particles in a flowing liquid could continue unhindered downstream, clogging up or damaging other pipeline components such as pumps, valves, and sensors. Sometimes, a pipeline’s layout dictates that a Y strainer is the only practical option. Its shape allows for installation in both vertical and horizontal pipeline systems. By contrast, the T-shaped device is only compatible with horizontal lines due to the orientation of its filter screen.
In addition to their geometry, these devices also differ in their performance characteristics such as filtration area, pressure tolerance, dirt-holding capacity, and ease of cleaning. While these criteria will influence the selection process, sometimes the price must be the deciding factor. Because their housings are cast, Y-shaped strainers are cheaper. Costs aside, as a rough guide, the T-shaped models display a lower pressure drop and are the better option for handling viscous fluids and high flow rates. By contrast, the pressure drop in Y-shaped models is higher due to their lower dirt-holding capacity. They are best for fluids with few entrained particles and low flow rates.
If you would like to learn more about Y strainers and basket strainers and which might be the best coarse filtration option for your pipeline operation, chat with an expert at Flow Clear Filtration.
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