The sand master is designed to provide on-site proppant storage volume exceeding the capacity of proppant transports and or sand bins – up to 380,000 pounds or 170 tons of proppant. The various models come with up to seven compartments, providing storage of multiple proppant types and improving measurement control. The sand master is equipped with a variable-rate delivery belt moving up to 16,500 lbs/min to the blender. The delivery belts swivel up to 180° for maximum flexibility and ease of equipment spotting. Calfrac’s sand masters are operated remotely from the operator's compartment atop each unit. Remote operation improves the operator’s vantage point and enhances the operator’s safety.