transport of high proppant concentration but relies on the fluids velocity from the high pump rates to transport gravel. It usually forms tight annular proppant pack but could have high leak off rate in permeable zones, which could result to sand bridging and poor packing 7. However, water pack does not contain polymer, which has Design Parameters of Application. Product Type Frac Sand and Proppants Material Density 60 to 90 Lbs. per Cubic Foot Conveyor Capacity 100,000 Lbs. per Hour Duty 24 Hours per Day, 7 Days per Week Advantages Provided by KWS. Accurately metering frac sand and proppants at high speed on a steep incline requires experience and know-how.