Prefabrication and assembly of piping systems for mining industry technology. The pipelines were manufactured according to the supplied isometric drawings. Mostly the 141 method welding. The non-destructive testing (NDT) according to the prescribed range and 100% visual inspection were used for the welds. The customer put great emphasis on meeting the schedule and the quality of work, which we were able to achieve. The coordination of the pre-production and assembly was fully in the competence of our employees.