RU2207532C2 - Apparatus for protecting pressure measuring device against action of weather and agressive media (variants) - Google Patents

Abstract

FIELD: systems for protecting pressure measuring devices against action of weather and aggressive media. SUBSTANCE: apparatus according to first variant of invention includes hollow cylindrical housing filled with separating liquid and having: branch pipe for filling housing with separating liquid; gas discharge branch pipes; branch pipe for connecting to measuring unit and branch pipe for taking off measured pressure. In lower portion housing has partition joined with tube providing presence of separating liquid in upper portion of housing at measuring process. One branch pipe for discharging gases is arranged directly under said partition. Branch pipe for taking off measured pressure is arranged directly under partition. According to second variant of invention apparatus is arranged directly in medium whose pressure is measured in such a way that partition is arranged lower than level of controlled medium. Branch pipe for taking off measured pressure is branch pipe for discharging gases arranged directly under partition. EFFECT: enhanced operational reliability of pressure measuring device, improved accuracy of measuring pressure. 2 cl, 2 dwg

Description

 The invention relates to devices used to protect pressure measuring instruments from the effects of climatic conditions and aggressive environments, and can be used in the oil and gas industry, pipeline transport and other industries, where there is a need to protect pressure measuring instruments from getting a measured working medium using a measuring fluid.

 It is well known to use a blank membrane for separating the measured working medium and the measuring means installed between them.

 A disadvantage of the known device is that the membrane forms, together with the measuring means, a blind closed cavity, which reduces the accuracy of the measurement due to exposure to ambient temperature and membrane elasticity.

 The closest technical solution to the claimed invention is a separation vessel, comprising a hollow cylindrical body, equipped with nozzles for filling with a separation liquid, venting gases, connecting to measuring instruments and selecting the measured pressure (Diaphragms and connecting lines for measuring the flow rate of liquid, gas, steam. Technical description and instruction manual 3.9026.223TO, СРС 63 according to GOST 14320-73, p. 19).

 A disadvantage of the known device is the unreliability of work, the inability to control the presence of a separation liquid in the vessel, the absence of which leads to the penetration of the working medium to the measuring means, which in turn reduces the accuracy of the measurement.

 The present invention solves the technical problem of improving the reliability of the device, the accuracy of pressure measurement.

 The specified technical problem is solved in that in the device for protecting pressure measuring instruments from the effects of climatic conditions and aggressive environments according to the first embodiment, comprising a hollow cylindrical body filled with a separation fluid and equipped with a nozzle for filling the housing with a separation fluid, nozzles for venting gases, a nozzle for connection to the measuring instruments and the pipe for the selection of the measured pressure, according to the invention in the lower honor of the housing is a partition connected to the tube ensuring the presence of the separating liquid in the upper housing part in the measurement process, wherein one of the nozzles for discharging gas is located directly under the partition, and for pipe located under the partition selection measured pressure.

 The specified task in the second embodiment is solved in that in a device for protecting pressure measuring instruments from the effects of climatic conditions and aggressive environments, comprising a hollow cylindrical body filled with a separation fluid and equipped with a nozzle for filling the housing with a separation fluid, nozzles for venting gases, a nozzle for connection to means of measurement, according to the invention in the lower part of the housing is a partition connected to the tube to ensure the presence of a separation liquid in the upper th part of the housing during the measurement process, while one of the pipes for exhaust gases is located directly below the partition, the device is installed directly in the medium, the pressure of which is measured, so that the partition is below the level of the controlled environment, and the pipe for exhaust gases, located directly below the baffle also serves as a pipe for the selection of the measured pressure.

 In figure 1. presents a General view of the device according to the first embodiment, figure 2 - General view of the device in contact with the measured medium (in the second embodiment).

 The device comprises a hollow cylindrical body 1, in the lower part of which a partition 2 is made, connected to the tube 3, a nozzle for filling the housing with a separating liquid 4, a nozzle for sampling the measured pressure 5, a nozzle for venting gases 6, a nozzle for connecting to the measuring means 7.

 The device operates as follows. Through the nozzle to fill the housing with a separation liquid 4 and the nozzle for connection to the measuring means 7, the cavity of the cylindrical housing 1 is filled with a separation fluid, which first fills the upper part of the housing 1, and then, flowing down the tube 3, begins to fill the lower part of the housing 1. When separation liquid in the pipes for exhaust gases 6, the latter overlap. Then, through the pipe to select the measured pressure 5, the device is connected to the pressure measurement point. Before starting the measurement, in order to remove the gas plug, the valves on the exhaust pipes are opened in turn 6. The device is ready for measurement. In the event that the pressure drops to the minimum mark from the device due to the elasticity of the pressure measuring instruments and the protective device itself, liquid will flow from the pipeline to the protective device and vice versa through the hollow cylindrical body 1 of the device separated by a partition 2 connected by a partition 2 with a tube 3, providing the presence of a separation liquid in the upper part of the housing during the measurement process, that is, the separation liquid will not flow into the pipeline, which ensures Vaeth reliable performance measurement tools.

 To prevent the impact of climatic conditions - low temperature - the device for protecting the measuring instruments is installed directly in the measured medium (option 2, figure 2) so that the partition 2 is below the level of the controlled environment, and the gas outlet 6, located directly below the partition, is also serves as a branch pipe for selection of the measured pressure.

 The present invention, in comparison with the prototype, provides reliable protection of pressure measuring instruments from the effects of temperature, aggressive media, excluding their contact with measuring instruments, and can be implemented as a protective device at pressure sampling points on diaphragms, in measuring instruments used to measure pressure on oil and gas pipelines.

Claims (2)

 1. A device for protecting pressure measuring instruments from the effects of climatic conditions and aggressive environments, comprising a hollow cylindrical body filled with a separation fluid and equipped with a nozzle for filling the housing with a separating liquid, nozzles for venting gases, a nozzle for connection to the measuring instruments and a nozzle for sampling the measured pressure characterized in that in the lower part of the housing there is a partition connected to the tube to ensure the presence of a release fluid in the upper part of housing in the measurement process, while one of the nozzles for the removal of gases is located directly under the partition, and the nozzle for the selection of the measured pressure is located under the partition.  2. A device for protecting pressure measuring instruments from the effects of climatic conditions and aggressive environments, comprising a hollow cylindrical body filled with a separation fluid and equipped with a nozzle for filling the housing with a separating liquid, nozzles for venting gases, a nozzle for connecting to the measuring instruments, characterized in that the lower part of the housing is a partition connected to the tube to ensure the presence of a release fluid in the upper part of the housing during measurement, while one of gas outlet pipes are located directly below the partition, the device is installed directly in the medium, the pressure of which is measured, so that the partition is below the level of the controlled medium, and the gas outlet located directly below the partition also serves as a pipe for the selection of the measured pressure .

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