Disclosed is a tube configured to conduct a fluid flowing through the tube in a specified flow direction and for this purpose comprises a tube wall, which encloses a lumen of the tube, and an interference body, which is arranged within the tube but is nevertheless connected to the tube wall at an inner face of the tube wall facing the lumen. In the tube according to the present disclosure, the tube wall has a maximum wall thickness of more than 1 mm and at least two mutually spaced sub-segments with a respective wall thickness that deviates from said maximum wall thickness, wherein the sub-segment is positioned upstream of the interference body in the flow direction, and the sub-segment is positioned downstream of the sub-segment in the flow direction.

A multiphase vortex flowmeter system determines the gas-to-liquid ratio (GLR) and flow rates from a well producing multiphase gas, oil and water by detecting the frequency and amplitude of vortices shed in a vortex flowmeter. In particular, the phase of the flow can be identified by detecting the change in the frequency of the vortices with respect to time, and the amplitude of the vortices. Based on the phase, the flow rates of liquid and gas can be calculated. As a feedback technique, these calculated values can be “tuned” by comparison with actual GLR and flow rates recorded for the well by a test separator.

A vortex flowmeter for measuring a flow rate of a fluid. The meter includes a flowtube, a bluff body, and a vortex sensor. The bluff body, which is positioned in the flowtube, sheds vortices in the fluid when the fluid flows through the flowtube and the vortex sensor detects the vortices and generates a vortex signal representing the detected vortices. A pressure sensor arrangement is configured to detect a differential pressure in the fluid between a first location upstream of at least a portion of the bluff body and a second location downstream of at least a portion of the bluff body and generate a differential pressure signal representing the pressure differential between the two locations. The flowmeter determines the fluid flow rate based on the pressure differential.

The fluid sensing device including a sensitive part, at least one obstacle, and a sensor. The sensitive part includes a flexible portion extending in a second direction substantially orthogonal to a first direction or fluid flow direction. The at least one obstacle extends in the second direction and is located in spaced relation to, and upstream of, the flexible portion. A collision of the fluid with the at least one obstacle generates vortexes in the fluid alternately on opposite sides in a third direction relative to the at least one obstacle, so that one or more of the vortexes collide with the flexible portion so as to distort at least part of the flexible portion. The third direction is substantially orthogonal to the first and second directions. The sensor includes at least one sensing part to detect the distortion of the flexible portion as a flow of the fluid.

A sensing device including a sensitive part and a first sensor. The sensitive part includes a sealed internal space. At least part of the sensitive part is flexible and configured to be flexed, by a load applied on the sensitive part or by vibration of the sensitive part, so as to change an air pressure in the internal space. The first sensor borders the internal space or is at least partly housed in the internal space. The first sensor includes at least one sensing part configured to detect changes in the air pressure in the internal space.

Vortex sensor amplitude information may be used to validate that a vortex signal being measured corresponds to an actual fluid flow and is not noise. The estimated amplitude of a sinusoidal vortex signal is used as a secondary means to determine the fluid flow based on vortex sensor characteristics. The original amplitude of the sinusoidal vortex signal is determined from a clipped voltage amplitude sinusoidal signal. The estimated velocity of the fluid in a pipe based on the original amplitude of the sinusoidal vortex signal is compared to the measured velocity of the fluid based on vortex velocity frequency. If the two determined velocities do not reasonably agree, the measured vortex signal is not a valid flow signal and adaptive filters are adjusted to reduce the effects of noise.

A measuring system includes: a lumen forming a flow path and a flow obstruction arranged in the flow path for effecting a disturbance in a flowing fluid; a sensor arrangement adapted to produce a first sensor signal and a second sensor signal; and transmitter electronics. The transmitter electronics are adapted to receive both the first and second sensor signals and to convert such into first and second sensor signal sampling sequences approximating the first and second sensor signals, respectively, the transmitter electronics further adapted using a digital adaptive filter to ascertain from the first sampling sequence a filter coefficients set and therewith to form a z-transfer function for filtering the second sampling sequence such that the z-transfer function is determined by the filter coefficients set, the signal filter and the second sampling sequence to produce a wanted signal sequence, to produce therefrom digital measured values representing a measurement variable.

A vortex flowmeter with at least one measuring tube, at least one bluff body and at least one measuring sensor arranged behind the bluff body, at least one measuring transducer and at least one evaluation unit, wherein the measuring sensor is arranged such that, during operation, it is deflected by the vortices of the medium forming behind the bluff body, wherein the measuring transducer is designed and arranged such that, during operation, it converts the deflection of the measuring sensor into a corresponding change in a measured variable and transmits it as a measured signal to the evaluation unit. The functionality of the measuring transducer can be checked is achieved by an actuator being arranged and controllable by a control unit such that the actuator can deflect and/or deform the measuring transducer and/or the measuring sensor.

The sensor assembly comprises: a bowl shaped, namely at least sectionally dished, membrane, with a curved surface and an oppositely lying surface; and a sensor blade extending from curved surface of the membrane. The membrane is so formed that at least one region of the curved surface adjoining the sensor blade is convex. A sensor formed by means of such a sensor assembly and by means of a transducer element coupled therewith and serving for generating a sensor signal representing movements of the sensor blade changing as a function of time and/or deformations of the membrane changing as a function of time, or a measuring system formed by means of the sensor and a measuring electronics connected thereto, can be used for registering pressure fluctuations in a flowing fluid, such as, for instance, a 400 C hot steam, for instance, in order to measure a flow parameter of the fluid.

A device and a method for determining the flow velocity of a fluid in a hollow body, including at least one disturbance device disposed in the hollow body and at least one sensor for identifying disturbances that are induced in the flow by the disturbance device, which is disposed at a certain distance downstream in the direction of flow from the disturbance device, wherein the disturbance device includes means for generating changeable disturbances in the fluid flow.