Flow measurement of slurries is a challenging application in flow metering. Selection of an appropriate flow meter for slurries depends on three primary factors:
- The content of solids in the carrier fluid, which can vary from a few percent to in excess of 80%.
- The properties of solids in the carrier fluid, which will vary in size, shape and abrasiveness. Rough solids can cause mechanical noise that interferes with the measured signal. Abrasiveness will determine whether the flow meter should have a standard liner or one that is designed for high abrasiveness.
- The chemical composition of the fluid, which may require a liner with the ability to withstand corrosive fluids.
- The flow velocity and profile. Velocity should therefore be kept reasonably low to avoid wear but high enough to avoid settling of the solids.
In addition, the choice of flow transmitter should considered the extent of mechanical and electrical signal noise caused by the slurry propoerties
The type of flow meter most commonly used for measuring the flow of slurries is the electromagnetic flow meter (Magmeter) although vortex meters, coriolis mass meters and ultrasonic flow meters are also used.
Slurries occur in many different forms across several industries. Typical slurry flow applications include: milled mining slurry; monitoring of sewage sludge; measurement of fruit juice flow; paper pulp flow in the paper industry; measurement of fly ash in suspension.
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