The ____ is the best measuring device for measuring sludge flow

• A. Orifice Plate
• B. Venturi Meter
• C. Magnetic Flow Meter
• D. Rotameter

Answer: (C)

Measured well for sludge flow is the Magnetic Flow Meter. It works by detecting the voltage generated as a conductive slurry moves through a magnetic field, so there are no moving parts that can clog or wear from solids. This makes it robust in dirty, particulate-laden flows common in sludge handling, and readings stay reliable across varying solids content as long as the sludge is sufficiently conductive.

Orifice plate and Venturi meters infer flow from a pressure drop across a constriction. Sludge with solids can foul the pressure taps, cause uneven flow, and wear the constriction, leading to inaccurate results and more maintenance. They also often require straight pipe runs and relatively clean fluid for accurate calibration.

Rotameters depend on a float in a tapered tube and need a clear, steady, low-viscosity liquid. Sludge with solids can clog or settle, and changes in density or viscosity affect the float position, making readings unstable. They’re not practical for typical pipeline sludge flows.