DEVICE FOR PURGING A PIPELINE - DYACHENKO VALENTIN A,SU; ZALKIND YURIJ A,SU; TARASENKO VIKTOR F,SU; MIKHEDOV ALEKSANDR I,SU; DRAKIN GEORGIJ V,SU; SOBOLEV VADIM B,SU; BOLSHAKOV VADIM I,SU; STOLBOV ANATOLIJ A,SU; CHEREVIK YURIJ I,SU; NOSKOV VALENTIN A,SU (1991)