Strainers are closed vessels that collect solid particles to be separated while passing a fluid through a removable screen. The screens can collect particles down to 0.001 inch in diameter. They can remove more than unwanted material. They can also remove wanted materials that can be used elsewhere or in other processes. You can find strainers upstream of sensitive equipment such as meters, pumps, compressors, traps, valves and filters. Strainers and filters are basically the same thing. The difference is that a filter removes much smaller particles, particles you normally can’t see. If you can not see the material being removed, it is usually called a filter.
You can find strainers in almost every industry: chemical, food, water, petroleum, paint and ect. Strainers come in different configurations such as Y Strainers, Simplex Strainers, Duplex Strainers and Temporary Strainers. They can be bolted, threads or welded in line.
There are two types of strainers, basket and y. The y strainer is normally used where there is a small amount of material to be collected. This strainer can be installed in the horizontal or vertical position. The basket must be to the bottom of the pipe or facing the down flow direction to collect the particles. A y strainer can come with a blow-off connection for automatic cleaning. With liquids y strainers have a greater pressure drop than basket strainers because of their size (comparing same sizes). But with gases a y strainer has a relatively low pressure drop.