NIOSHTIC-2 Publications Search
Air and Power Requirements for the Vacuum Transport of Crushed Coal in Horizontal Pipelines.
Konchesky-JL; George-TJ; Craig-JG
Pneumotransport 2 2D Int'l Conf Pneumatic Trans Solids in Pipes England PP B4-45--b4-55 :B4-45--b4-55
Experiments in the vacuum transport of crushed coal through horizontal pipelines produced data for empirical equations and graphs that give minimum air and power requirements for combinations of coal rates, specific gravities, pipe diameters, and lengths. Highest coal throughput rate achieved in these experiments was 18 tons per hour of coal (1.4 Specific gravity) through 200 feet of 6- inch-diameter pipe followed by three shorter runs connected by bends of different radii. About 800 cubic feet per minute of air was required to keep the coal moving in full suspension through the pipeline. Based on extrapolations of the equations, 155 tons per hour of 4- by 0-inch coal (1.4 Specific gravity) can be pulled through 200 feet of straight 12-inch-diameter pipe by 5,500 cubic feet per minute of air requiring 150 theoretical horsepower. For 500 feet of pipeline, the haulage rate would be 70 tons per hour requiring 5,100 cubic feet per minute of air and 145 horsepower. Moisture content and size of the coal were not significant variables. Moistures should be considered, however, in the design of pick-up and acceleration sections where adhesion to the walls is more probable. Maximum coal size cannot exceed one-third the diameter of the pipe.
Pneumotransport 2, 2D Int'l. Conf. Pneumatic Trans. Solids in Pipes, England, PP. B4-45--b4-55
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division