Wye Strainers

Wye Strainers

Application Information 

Y Strainers are devices for the mechanical removal of unwanted solids from liquid, gas, or steam lines using a perforated or wire mesh filter element. They are used in pipelines to protect pumps, meters, control valves, steam traps, regulators, and other equipment. Y strainers are very cost-effective filtration solutions in many applications. When the amount of material removed from the stream is relatively small, resulting in long intervals between strainer cleanings, the strainer screen is cleaned manually by closing the line and removing the filter cap. Y strainers can be equipped with a “vent” connection that allows you to clean the screen without removing it from the filter body. Y-strainers are used in various liquid filtration applications to protect downstream process system components in many industries, including chemical processing, petroleum, power generation, and marine. Where Y Strainers are used to protect equipment that could be damaged or clogged by sand, gravel, or other unwanted debris, are very common. Although often used in many liquid applications, a Y Strainer is considered the standard for steam applications and is almost universally used. Its compact cylindrical shape is very robust and can withstand high pressures. It is, literally, a pressure vessel. Industrial Strainers that handle pressures up to 6000 psi are not uncommon. Of course, in these cases, the filter’s design is critical to withstand these high pressures without fear of failure. When high-pressure steam is handled, another complicating factor arises, temperature. With steam pressures of 1500 psi or more, sometimes standard carbon steel is unsuitable because the steam temperature can be 1000 °F or more. In these cases, the Y-Strainer body is usually made of chrome-molybdenum steel. In addition to steam, Y strainers are typically used in air and natural gas applications. Again, high pressures are not uncommon. However, unlike pressurized air steam, this does not automatically mean high temperature; therefore, standard carbon steel bodies with sufficient wall thickness are often sufficient.

They are popular in the chemical, food, and pharmaceutical industries. You cannot overstate that Y strainers must be adequately designed for critical applications. This means a sufficiently large wall thickness and blown fittings. For example, condensation in poorly trapped steam lines can accumulate at the lowest points and become a snail of water moving at very high speeds along the line. Even the slight change in direction caused by a Y-strainer can produce a tremendous shock that can damage the strainer. Manufacturers who thin walls to save weight and cost are asking for trouble in these cases. If fitted with drain fittings, a strainer can be a self-cleaning strainer. A valve is installed on the connection to the filter cap.

This way, it is possible to clean the screen simply by opening and to close the valve without interrupting the flow or dismantling the filter. When the valve is opened, the material trapped inside the screen flows out.

Metal Expansion Joints are sometimes used along with a strainer. A bellow is part of the expansion joint. Duplex Strainers are also used.