Pump leakage has become more critical in recent years because of environmental concerns, fugitive emissions, handling of carcinogen materials and loss of valuable products. Acid based fluids typically have viscosities similar to water, and may have no or limited lubricity properties. Internal gear pumps or external gear pumps work best with Newtonian type fluids. Shear sensitive fluids are not a good application for gear pumps. The complete list of shear sensitive fluids is endless. Fluids that provide good fluid film between bushings and idler pin have best results with gear pumps. Acid based fluids also may not be compatible due to materials of construction and seals supplied with gear pumps. VIKING Pumps has a stainless liquid vane pump (LVP) for light weight fluids and a non-metallic mag drive external gear pump (CMD) for hazardous fluids that have Newtonian properties and require (leak free) seal-less operation.
Please see this at https://pyebarker.com/misapplications-for-positive-displacement-gear-pumps/
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