Abstract: The feed pipe of reject medium draining screen in coal cleaning plant is often seen to suffer severe wear at local points for the reason that the fluid chuting through the pipe is a complicate mixture in nature. In order to extend the pipe's service life and the medium draining screenplate replacement interval,redesign and renovation work is made of the process pipe based on result of analysis of the direction of material flow and the points where the pipe inner wall is subjected to impact. This involves the fitting of buffer mechanism at wearing points and addition of novel wear-resistant lining. The renovation work has led to elimination of pipe leakage and reduction of operating and maintenance costs,consumption of material and labor intensity. Moreover,because of the extension of the service life of such pipes,a favourable economic and social result has been brought about for the plant. The renovation work proves to be practically effective and technically feasible.