conveying limestone aggregates and colliery spoil by hydraulic pipeline: trials with a 156 mm diameter pipe

in 1976/77 test facilities belonging to english clays lovering pochin & co ltd at st austell, cornwall, were hired by the transport and road research laboratory to study the behaviour of coarse granular solids (limestone aggregates up to 50 mm diameter and colliery spoil) when pumped as slurries with water through a steel pipe of 156 mm diameter. this report contains the results of the test programme. the headloss was measured for materials with a variety of gradings over a range of velocities up to a maximum of about 6 m/s with a range of concentrations up to a maximum of 28 per cent by volume (about 50 per cent by weight). the results are presented largely in graphical form and a brief discussion of possible applications is given in an appendix.(a)