Implementation costs analysis of constructing a medium- and low-pressure gas network with connections – open-cut vs. trenchless    
In USA there was published a study titled "Cost and Risk Assessment for Horizontal Directional Drilling Compared to Open-Cut Method in Urban Environment". It was conducted among contractors and it indicated that 68% of them identified difficult geological conditions as the most important cost and risk factor. The second most important factor in the study was the access to the construction site - 46%. Having a proper access to a construction site can help reducing the time spent on maintenance.
Social costs, mobility constraints (ie, restrictions, control) were listed as another important factor - 39%. As far as the open-cut method was concerned, 61% of the contractors thought that the condition of the soil was the most important factor. Traffic problems were the second most important problem for the construction, because in urban areas traffic lanes are usually closed or passage is limited. An analysis of the costs of implementation of the medium- and low-pressure gas networks with connections (open-cut vs. trenchless method) will be presented in the above described context.

dr inż. Florian G. Piechurski, Silesian University of Technology
An academic teacher and researcher at Silesian University of Technology. He has the the appropriate designing and construction works management qualifications in terms of installing heating, ventilation, gas, water supply and sewage networks. The organizer and secretary of many scientific events, the author and the co-author of 400 scientific articles. He took part in 64 swimming pool installation projects, 124 water supply and sewage projects and 68 water supply and sewage pipeline network projects. In private life he is a husband of Alina, a father of Paulina and Małgorzata, a grandfather of Amelka, Olaf and Bartosz. He likes swimming, mostly in warm seas. An amateur athlete and basketball assistant coach. He likes traveling and getting to know histories of different countries.