Strainers eliminate pipeline debris such as scale, rust, jointing compound and weld metal in pipelines, protecting equipment and processes. There are two main types of strainers based on their body configuration – the Y-type and the basket type.Y-type Strainers
The Y-type strainer is the almost universally used for steam. The Y-type strainer’s body handles high pressures and has a compact cylindrical shape. It is a pressure vessel and is able to handle pressures of up to 400 bar g.Basket type strainers units
The basket type or pot type strainer is characterized 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.
Basket type strainers are commonly found in a duplex arrangement. A second strainer is placed in parallel with the primary strainer, and flow can be diverted through either of the two strainers. This facilitates cleaning of the strainer unit whilst the fluid system is still operating, reducing the downtime for maintenance.