strainers

A strainer is a device that uses a screen, mesh, or perforated surface to separate solids from liquids or to remove solids from gases. Strainers are used in kitchens, laboratories, and industrial settings to trap unwanted solids while allowing fluids or air to pass.

In the kitchen, strainers include colanders, sieves, and specialized tools such as the chinois or tea strainer. They come in various meshes, shapes, and materials, most commonly stainless steel, plastic, or silicone. Mesh size determines what is trapped and how quickly liquid drains.

Industrial strainers protect equipment and control process streams. Common forms are basket strainers, Y-strainers, and inline or tee strainers. They remove debris from liquids or gases and are selected by flow rate, pressure, temperature, and particle size. Materials include stainless steel, carbon steel, bronze, and engineering plastics.

Design considerations include pore size, surface area, and whether the unit is washable or requires periodic basket cleaning or backflushing. Maintenance involves cleaning or replacing the screen, inspecting for damage, and ensuring proper drainage and seal integrity. In high-hazard environments, hygienic and sanitary design is required.

In selecting a strainer, engineers consider parameters such as operating temperature, pressure drop, and compatibility with the process fluid. Proper installation, routine maintenance, and safe handling extend service life and prevent contamination or equipment failure.