Warranty measurements have been performed for work of the plant according to the designed parameters at the new system for collecting, preparation and transport of ash and slag hydro-mixture in TEKO B. The basic designed parameters, which need to be maintained, are in the process of achieving assigned flow of ash and slag hydro-mixture with designed mass participation of solid phase in the hydro-mixture, and upon the protocol prepared prior to the warranty measurements. In the process of warranty measurements was necessary to prove the plant capacity in permanent work and given parameters. Samples of dry ash and slag have been taken as well as hydro-mixture at the end of transportation lines to process it partially in the mobile field laboratory and in laboratories of the Mining Institute.