Abstract: The invention provides a method for on-site monitoring of the quality of the gases delivered to a consumer site, the monitoring being carried out during the delivery, in order to declare the delivery compliant or non-compliant with specifications, being characterized in that, during the delivery, a monitoring of the gas(es) delivered is carried out by the thermal conductivity technique.

Abstract: The invention provides a method for on-site monitoring of the quality of the gases delivered to a consumer site, the monitoring being carried out during the delivery, in order to declare the delivery compliant or non-compliant with specifications, being characterized in that, during the delivery, a monitoring of the gas(es) delivered is carried out by the thermal conductivity technique.

Abstract: A connection system for a pressure cylinder (5) comprises a check valve (4) located in the neck (15) of the pressure cylinder (5) and which is equipped with a gas removal connection opening and can be operated from the outside by means of a valve tappet displaceable along a central axis (6), as well as a connecting device (2), which is connectable in gastight, detachably locking manner with the check valve (4) and contains means for valve tappet operation. In such a connection system an easy and rapid replacement or connection of cylinders is made possible, whilst leading to a high security against incorrect operation and faults and reliable handling and storage of the cylinders in that the pressure cylinder (5) with the check valve (4) and connecting device (2) are mechanically couplable in a common pivoting axis (34) located at right angles to and outside the central axis (6) and in the coupled state are connectable by a pivoting relative to one another about the pivoting axis (34).

Abstract: In the process for the ozone treatment of hot water in the hot water supply system of a building for the purpose of disinfection of the water, the hot water is led into a treatment tank (3). Here the pressure is reduced to a level below that in the pipes of the hot water supply system, an ozone-containing gas being continually introduced into the water, which gas passes through the water in the form of bubbles, the ozone being given up to the water. The remaining gas subsequently undergoes transition to a gaseous state in the upper part of the tank, from which the gas is drawn off. The treated water is then fed into the hot water supply system of the building, the pressure being restored by means of at least one pump to the level of the operating pressure within the hot water supply system. The method can be used to remove harmful micro-organisms such as legionella pneumophila from hot water systems without raising the temperature to around 70.degree. C.

Abstract: During melting in an electric melting furnace of iron products such as pig iron, scrap iron, directly reduced iron pellets, and various alloy metals, or mixtures of the foregoing having greatly varying impurities, solid carbon dioxide is led over the melting hearth shortly before, during, and after charging. Explosive burning of the combustible constituents is thus prevented in that the oxygen is displaced during the charging operation by the expanding gaseous carbon dioxide produced. The method makes possible electric steel production with reduced accumulation of dust and fumes in that formation thereof is largely eliminated directly at the source. By cutting down on the high volumes of gas and gas temperatures occurring during charging without carbon dioxide, substantially smaller filter installations are needed, whereby the amount of savings on investment and operating costs economically compensates for the cost of the carbon dioxide utilization.