RU28392U1 - RING FLOW METER - Google Patents

Description

RING FLOW METER

This invention relates to devices for measuring the flow rate and amount of gas and can be used at enterprises of the oil, oil and gas, petrochemical, ministry of public utilities and others.

Known flowmeter, consisting of a cylindrical measuring unit mounted across the pipelines D11go1 lanometer. The unit has a channel for measuring full pressure with inlet pressure gauges, located directly against the flow, a channel for measuring static pressure with inlet holes, located 1 1 and in the opposite direction from the sides / French patent} L 2578644, ШМ 4 & 01 F 1/34, publ. 09/02/1986 bks. 37 /.

However, due to the design of the measuring unit, it is not possible to obtain accurate flow measurement data.

A device is known that contains a tube placed in a pipeline and receiving full pressure, the receiving part of which is directed towards the flow / Lobachev P.V., 0 evelev F.A. Measurement of flow rates of liquids and gases in water supply and sewage systems, M., Stroyizdat, 1985 p. 241 /.

However, this device has insufficient accuracy of flow measurement, because the flow rate of a moving medium is measured only at one point, and is highly dependent on changes in the velocity plot and changes in the sweat density in the radial direction.

A device is known that contains two tubular rings of rectangular cross section with whether there are holes in them and fittings for outputting the frontal and bottom pressure / A.C. USSR No. I045I30, G 01 P / 00, S-01 P5 / I6, G-01 M9 / 00 /.

The disadvantage of this device is its low accuracy and low flow rate due to imperfect construction.

Closest to the claimed technical day is a device containing a diametrically calibrated section of the pipeline with an inlet and an outlet, a static pressure sampling nozzle installed in the hole on the pipeline wall, and a full pressure sampling device having slotted inlet measuring holes located on the inlet side in the pipeline section associated with the inputs of the differential pressure meter; equipped with pressure and temperature sensors, as well as a processor, slotted inlet measuring holes are connected in a closed annular groove made in the center of the frontal part of a thin-walled ring having a drop-shaped cross section and

located in the zone of average speed of the measured flow, while the outputs of the pressure sensors, temperature and pressure difference meter are connected, respectively, to the input of the processor, / RF patent A 2055322 /.

The disadvantage of this device is the possibility of large mechanical particles 0 1-1.5 mm entering the gap at high gas flow rates. Over time, this can lead to blockage of gas passages to differential pressure meters. Despite this, performance is not impaired. The error and inertia can only slightly increase.

The aim of the invention is the improvement of KOristruggdi.

This goal is achieved by the fact that a sleeve ring from a core-porous material (for example, cermet /) is pressed into the slit space in its frontal part, providing a better free passage of liquid and gas to pressure differential sensors, but preventing the passage of large particles.

The pressure pressure measuring device is made in the form of a ring with an oval frontal part 2, in which an annular slotted groove is made. A pulser 7 is pressed into the frontal part of the slot groove for a length of 10-15 t. The configuration of the outer side surfaces of the ring eliminates the stall / double Laval wing /, while the axis of the slot groove is 0.242 R. . The device is installed on racks 5. Inside the racks are made through grooves for transmitting pressure head. Racks are welded to the ring, which is made of two half rings - internal and external. A groove is made in the inner ring, providing connection and averaging of the pressure head transmitted through the aisles of the racks. The inner and outer rings are welded and the side surfaces are treated with the required cleanliness. A fitting 3 is welded to the upper part of the ring transducer, providing pressure transfer to the pressure gauge 6. A drainage nozzle 4 is welded to the lower part of the ring transducer, to purge the measuring lines. The collapse of the ring flow meter makes it possible to install it in the pipeline I instead of the diaphragm without reconstructions and changes with the joints.

The advantages of this device are its simplicity of manufacture, low cost, low aerodynamic resistance, high accuracy of flow measurement, and with individual calibration it can be used exemplary tool.

$ jOOl / 3 //,

the back of the wall of the ring, it practically does not accumulate, while the force of the gas flow centrifugal with respect to the slit, as well as the pressed sleeve ring, is not clogged by mechanically / gmi admixture1. and suspended. The device eliminates the accumulation of liquids or condensate with a sharp lower tag "temperature. It itself is a flow stabilizer, which significantly reduces the error of y; fading from changes in flow turbulence. This design, with a constant gas composition, implements a direct measurement method in both mass and volume units.

Replacing diaslragms with ring flowmeters will reduce power consumption when switching gas through pipelines by reducing internal resistance, which is determined by the diaphragms.

G.A. Pautov

Claims (1)

An annular flow meter containing an inlet and outlet section of a pipeline calibrated by its internal diameter, a static pressure sampling nozzle and a full pressure sampling device having slotted inlet measuring holes and equipped with pressure and temperature sensors, as well as a processor, characterized in that in the frontal part of the slotted the groove is pressed into the sleeve ring, which is made of large-pore material.