Abstract: A pump unit for a nuclear installation, for example a pressurized water reactor, contains a vertical shaft, which is guided through at least one journal bearing. The journal bearing or bearings is or are configured as a spiral groove bearing or bearings, to prevent shaft vibration caused by the bearings and to increase the service life of the pump unit. Preferred uses of the pump units include, for example, the coolant pump of a pressurized water reactor and the circulating pump of a boiling water reactor.

Abstract: This invention relates to a burner, especially a gas turbine burner, wherein a Helmholtz resonator downstream of a fuel inlet position in directly linked with a burner channel. In this manner, combustion oscillations do not arrive at the fuel inlet position, thereby reducing acoustic disturbances and air ration deviations which are the main cause for the formation of combined oscillations. The invention also relates to a method for operating a burner and a gas turbine.

Abstract: This invention relates to a burner, especially a gas turbine burner, wherein a Helmholtz resonator downstream of a fuel inlet position in directly linked with a burner channel. In this manner, combustion oscillations do not arrive at the fuel inlet position, thereby reducing acoustic disturbances and air ration deviations which are the main cause for the formation of combined oscillations. The invention also relates to a method for operating a burner and a gas turbine.

Abstract: A combustion device for the combustion of fuel, includes a supply duct for supplying a fuel to a combustion zone. The fuel is capable of being guided through the supply duct in a fluid stream with a direction of flow and at a nominal velocity lying within a nominal operating interval. Further, the supply duct is narrowed in an uncoupling region, such that at the nominal velocity, sound waves running opposite to the direction of flow in the fluid stream from the combustion zone are at least partially reflected in the uncoupling region.

Abstract: A method for ultrasonic leak location includes showing sound levels at various measuring locations along a measurement segment, which is a part of an annular structure, with a bar diagram. The same bar diagram is added again to the bar diagram. A particular sound level having the highest value and being located the most in the middle of the placed together bar diagrams is picked out. A segment around the associated pickup positions having one complete set of pickup positions is picked out. Two compensating straight lines for that set having an intersection being ascertained to identify the leakage position are determined. Another method includes providing at least a sound level having a position substantially facing the leakage position with a correction value. An apparatus for ultrasonic leak location includes a number of ultrasound pickups being disposed along a measuring segment. Amplifiers and components forming an effective value connect a data processing system to outputs of the ultrasound pickups.

Abstract: A method for ultrasonic leak location includes showing ultrasound levels measured at various measuring locations along a measuring segment in a bar diagram. An intersection of two straight lines in the bar diagram is ascertained to identify a leakage position. At least an individual ultrasound pickup is calibrated with respect to its amplification factor and/or its location error. An apparatus for ultrasonic leak location includes a number of ultrasound pickups being disposed along a measuring segment. Amplifiers and components forming an effective value connect outputs of the ultrasound pickups to a data processing system. The data processing system calibrates an individual ultrasound pickup with respect to its amplification factor and/or its location coordinate.

Abstract: A method for ultrasonic leak location includes showing sound levels in a bar diagram at various locations along a measurement segment. The measuring segment is divided into subsegments with intrinsically uniform damping. Effective portions are obtained by multiplying the subsegments by the associated damping coefficient, and an effective portion is assigned to each of the subsegments. Corresponding effective measuring positions are ascertained for the measuring locations within the effective portions. Respective logarithmized net sound levels are plotted through the ascertained effective measuring locations and two inclined straight lines are produced as a result. An intersection of the straight lines in the bar diagram is ascertained for identifying a leak point. An apparatus for ultrasonic leak location includes a number of ultrasound pickups being disposed at measuring locations along a measuring segment, a data processing computer, amplifiers and components forming an effective value.