Bitumen Inlet Filter / Strainer Basket

Function

A single piece of aggregate or metallic scale that reaches the gear pump's close-running clearances — typically 0.03–0.08 mm between gear teeth and housing bore — can score the bore, accelerate internal slip and reduce pump flow efficiency progressively. Over time, pump slip losses increase the power required per unit of flow, reduce delivery pressure and ultimately cause pump failure. The inlet strainer is therefore a critical protective device. Conversely, a clogged strainer basket is itself a cause of pump cavitation and flow drop, so both conditions — blocked and absent filtration — reduce pump life.

Construction & quality

Body: cast iron or carbon steel with external epoxy coat for corrosion resistance. Basket element: 304 stainless steel perforated sheet with welded support rim, mesh opening 1.5 mm or 3.0 mm to order, basket depth 100–150 mm. Cover: bolted flanged lid with replaceable nitrile gasket. Drain plug: BSP ½" for safe basket removal without full line drain. Optional differential pressure tapping connections are available for fitting a clog-detection indicator. Body rated PN10.

When to replace

• Pump suction pressure drops or pump runs noisily — audible cavitation from blocked basket
• Application rate falls despite correct pump speed and delivery-side pressure
• Visible debris accumulation in basket on routine inspection
• Basket mesh shows tears or inward distortion — collapsed under high differential pressure
• Cover gasket weeps bitumen at the lid flange joint