Comparison of construction costs of gas networks low and medium pressure by different methods
Analyses are presented comparing the cost of constructing gas networks for four projects using trench and trenchless methods. These analyses show that for the majority, the trenchless method is the economically more attractive choice. The total costs of constructing gas networks using the trenchless method in 3/4 of the analyzed cases are lower and account for 83% ÷ 90% of the costs of the trench method. In one case, the costs of execution by the open trench method are lower and account for 98% of the costs of execution by the drilling method.
When analyzing the installation work, in the trenchless method a large share of the cost is made up of drilling and jacking, which can often exceed the cost of excavation – especially for large network diameters.
In order to economically evaluate a given gas network construction project and select an appropriate construction method, many factors must be taken into account. These include the type of soil found in the area, the depth of groundwater, the multiplicity of underground infrastructure, the pavement found along the network route, and the diameter of the pipeline associated with the price of drilling. Each project should be approached individually.