Today most contractors agree that, in general, it costs as much to place concrete as to buy it, and therefore to remain competitive the most effective means possible must be found to reduce this placing cost. All concrete pumps are basically similar in principle. All collect concrete in a receiving hopper. This hopper serves as an intake for the pump intake. Suction, auger or other similar action transports the concrete through hose, pipe, or a combination of both, to the point of discharge. The pressure generated must be sufficient to push the concrete through the hose or pipe while overcoming weight and internal mobility resistance, as well as frictional drag forces. Pump capacities vary, depending on design and materials. Rated capabilities range from 12 to 65 cubic yards per hour.