Strainers

A strainer protects downstream equipment by capturing the debris, scale and sediment carried in almost every pipeline. Commissioning alone introduces weld slag, jointing compound and construction debris, while older systems shed corrosion products and biofilm. Left unchecked this material erodes valve seats, blocks control pilots, jams meters and wears pump impellers. A correctly sized strainer, cleaned on a sensible schedule, is a low-cost way to extend the life of the equipment it protects.

The Y-type strainer is the general-purpose choice. A perforated or mesh screen sits in a branch angled off the flow, so it can be removed and cleaned through a bottom cap without disturbing the pipework. Y-strainers are compact, suit any orientation and are the default protection for control valves, pilot circuits and instruments. The basket strainer offers a much larger screen area in a vertical body, so it holds more debris and drops less pressure at high flow, which suits pump suction lines and dirtier duty.

Screen selection is central to performance. A fine mesh protects precision equipment such as pilots and meters, while a coarser perforated screen suits general protection of pumps and valves at lower pressure drop. The screen should stop particles large enough to damage the downstream item while passing normal debris without blocking too quickly. Duplex (twin-basket) arrangements allow one basket to be cleaned while the other stays in service on continuous processes.

Bodies are made in cast and ductile iron, cast and stainless steel and bronze, with screens in stainless steel, rated to common flange and pressure standards to EN 1092 or ASME B16.5 and tested to EN 12266. When specifying, provide the bore, pressure rating, medium, the equipment being protected and the preferred screen size or perforation. We can then match a strainer, screen and, where useful, spare screen and seal kits for the duty.