Many factors, some of which are not easily defined or described, must be considered in the design of a hydraulic backfill system. After participating in the design of several plants, I have a conviction that future refinements in sandfill systems must come in large part, from the merging of good design ideas and information from existing operating plants. It is important then, that we document and publish information on existing plant designs and their operating characteristics. This information will then be available for use by our successors and later innovators in hydraulic fill placement.
The pump selected for the Mayflower Plant is a Gardner-Denver 5×6 FXG-FG duplex power pump, fitted with 3-½ inch diameter pistons and liners. It is being operated at a main shaft speed of 56 rpm. The sand slurry described is being pumped into the mine at 48 to 51% solids. Dry solid density is approximately 3.0 grams per cubic centimeter. The fluid flow from the pump to the mine is approximately 55 gallons per minute and operates at a pump discharge pressure of 500 psi. The capacity of the system is 9.7 tons of solids per hour.
As indicated in our original Plant schematic, slurry