Gas explosion and detonated waves parameters were determined for an ideal gas in an enclosed volume with rigid walls in gas systems on the border between explosive gases and liquids for different boundary conditions. Examples of the explosion of the combustible mixture of methane and air, with full and partial oxidation of methane have been considered.

Having accounted coal particles after fragmentation on different equipment, particles in the form of needles, cubes, plates, blocks and pyramids were distinguished. After the analysis of the research to define the speed hindered falling of particles of different forms in water (hydraulic fineness) there have been proposed dependencies considering the density of the heterogeneous carrier phase, effective viscosity of water containing coal mud in different quantity, equivalent diameter for different forms of coal particles and the seeming density of dry coal at a specific ash content and average humidity.

Volume shares taken by every phase of the heterogeneous mixture for coal particles in the shape of cubes, plates, needles, bricks and pyramids allow defining true density of mark D bank coal. Using the fineness all-up, taking into account the ash content and the forms of the extruded coal particles, we obtained the volume for heterogeneous water-coal suspension 16 % less than the cubic grains volume, calculated by the old method.

Transportation of petroleum products by pipelines in Russia is carried out by centrifugal pumps of type NM in accordance with GOST. A description of the operation of a volumetric explosion pump, protected by a patent of the Russian Federation, which allows to reduce the number of pumping pumping stations at main slurry pipelines, is given.

Pipeline transportation in normal operation has advantages over other modes of transportation in that it is less polluting to air, water and land. When a pipeline bursts as a result of a hydrostroke, increased wear and tear of pipe sections or sudden changes in ambient air temperature, these advantages are lost.

Among the positive displacement pumps diaphragm pumps are distinguished by the fact that they have no rubbing metal pairs and face clearance tolerances, and the designs are simple and unpretentious, especially when pumping contaminated liquids and hydraulic mixtures.

Modern technological processes utilize impact, which is obtained by means of devices that are fundamentally different from each other.

At operation - systems of main coal hydrotransportation systems reliability can be increased, if to simplify the structure of systems, for example, to apply such a facet composition of a hydraulic mixture, that in system the dewatering complex is not necessary.

For hydrodemolition of coal underground method, in addition to stationary jets are used pulse and pulsating ones.

In LMI works on research and creation of new working bodies of mining machines with spiral-chain type drive ...

An important importance in the selection of hydraulic drive for mining machines is the development of more convenient methods of using the characteristics of the hydraulic drive. The main role in the transformation of speeds and torques of the hydraulic drive is assigned to two of its properties: the graphical representation of these two properties on the operational characteristics of hydraulic turbo-transmissions has been called stiffness and opacity.

In the process of operation of the hydraulic monitor complex, the head at the nozzle of the hydraulic monitor during the shift varies due to the disconnection and connection of consumers of high-pressure hydraulic energy. These head fluctuations affect the performance of the hydromonitor.

In connection with the development of new equipment for high-performance hydraulic mines the problem of creation of autonomous mining and sinking machines is put on one of the first places in the near future. Such machines can be self-propelled high-pressure hydraulic monitors.

The problem of automatic maximization of self-propelled hydraulic monitors productivity at development of coal seams by hydraulic method has not been solved yet, though practice has long ago established that the dependence between the hydraulic monitor productivity q and the speed of its trunk movement v along the face front has an extreme character. As can be seen from Fig. 1, the top A, which characterizes the optimal operating mode, under the influence of changes in mining and geological conditions drifts...