Cold-Planing (Milling) Production and RAP Tonnage
Square yards per hour a cold planer cuts and the reclaimed-asphalt (RAP) tonnage it makes, which sizes the haul fleet: sy/hr = drum width x speed x 60 x efficiency / 9; RAP tph = sy/hr x depth x density x 0.75 / 2000. A 7 ft drum at 30 ft/min covers 980 sy/hr, and a 4 in cut of 148 pcf pavement is ~218 tph of RAP - a truck every three minutes, or the mill stops. Field conditions govern the efficiency.
Formula and source
sy_per_hr = drum_width_ft x speed_fpm x 60 x efficiency / 9; spread_lb_per_sy = depth_in x density_pcf x 0.75; rap_tph = sy_per_hr x spread_lb_per_sy / 2000.
Cold-planing production identity by name (area rate from drum/speed/efficiency; RAP from area rate x spread); first-principles production arithmetic.
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