In mining practice, one often has to deal with the design and operation of complex air pipeline networks. Currently, there are several technical and techno-economic methods for their calculation. For practical calculations, it is more convenient to use the nomogram located at the end of the article (see article). Using this nomogram greatly simplifies the selection of a pipeline and the calculation of all network elements. The advantage of the nomogram also lies in the fact that we can easily find from it the equilibrium states in the air duct when the pressure at the beginning of the calculation section is specified, but we do not know the mutually interconnected pressure that will be established at the receiver, the air flow rate and the pressure loss at this area. It is quite obvious that now we cannot allow a free choice of the speed of air movement in the pipe; considering the issue from the point of view of minimum economic costs, we are obliged to: find an equilibrium state in which a certain pressure at the receiver, air flow and pressure losses determined by the pressure at the beginning of the element and the diameter of the pipe will be established; This problem of finding an equilibrium state in a pipeline is solved using a nomogram through several samples.
