Flow measurement basing on differential pressure

FIELD: measuring equipment.

SUBSTANCE: invention relates to systems for controlling a manufacturing process or its monitoring. System (102) for measuring a process fluid flow in process pipe (106) in the production process comprises flow limiting element (110) in the process pipe. First sensor (124) of differential pressure is configured to measure the first differential pressure on flow limiting element (110) under the action of process fluid (104) flow. Second sensor (130) of differential pressure is configured to measure the second differential pressure in process fluid (104) on flow limiting element (110). Electronic circuit performs diagnosis basing on the first differential pressure and the second differential pressure.

EFFECT: higher accuracy of diagnosis and control.

23 cl, 3 dwg

 



 

Same patents:

FIELD: measurement equipment.

SUBSTANCE: system includes a flow meter having a differential pressure sensor connected parallel to a Venturi tube to a pipeline, and a fraction meter with a double-peak energy source, each of which is functionally connected to a digital processor. In addition, the system includes a pump connected to the pipeline at the flow meter inlet, which injects at least one pulse portion of known amount of liquid, which is sufficient as to volume so that liquid phase can be increased for some time by the amount determined by the flow meter. After the liquid pulse portion is injected into the multiphase flow, the digital processor calculates changes in percentage composition of liquid and gaseous phases, which should have occurred as a result of injection of the pulse portion, and compares the calculated changes to actual changes so that the flow meter can be calibrated. Then, the measured increase in the liquid flow is deducted from full measured liquid flow to determine actual percentage of the liquid flow.

EFFECT: improving measurement accuracy of percentage composition of liquid and gaseous phases in a multiphase fluid, when one phase comprises a small part.

20 cl, 6 dwg

FIELD: instrument making.

SUBSTANCE: invention is related to measurement equipment and may be used to measure flow rate of fluid mediums by pressure difference. Device comprises tubular body inbuilt in pipeline, inlet and outlet cylindrical portions of which are equal to diametres of pipeline. Between inlet and outlet portions there is a metering section, which is created by direct and reverse cone-shaped measurement channels. diametres of smaller bases of direct and reverse cone-shaped channels are equal to diametres of inlet and outlet cylindrical sections accordingly. Sides of direct and reverse cone-shaped channels with lower bases are connected accordingly with inlet and outlet cylindrical sections. Larger bases of direct and reverse cone-shaped channels have equal diametres and are connected to each other. Besides length of direct cone-shaped channel exceeds length of reverse cone-shaped channel four times. diametres of larger bases of direct and reverse cone-shaped channels exceed diametres of their smaller bases 1.6 times. In cross sections of tubular body there are holes with the first and second nozzles for connection of pressure measurement facilities. At that the first nozzles are provided in area of connection of larger bases of direct and reverse cone-shaped channels, and the second nozzles are provided in outlet cylindrical portion.

EFFECT: higher accuracy of measurements.

1 dwg

FIELD: instrument engineering.

SUBSTANCE: invention refers to consumer-supplied working medium metres, e.g. for metering a hydrating inhibitor (methanol) in processing line of gas field and gas wells. In service-pressurised body 2 of the metre, there is a metering unit of a micromanometer 1 under lens 4. In a pass of the body, there is a restriction that is orifice plate 3 pressed with stopper 5. Metering unit 1 of the micromanometer is isolated from contact with the working medium by elastic divider 6 and along with the lens pressed with nut 7 wherein radial holes 8 are formed to increase amount of incident light on a micromanometer scale. The cavity B of the metering unit knot is filled with nonfreezable liquid (silicone liquid or multigrade hydraulic oil).

EFFECT: invention allows for low-flow metering (less than 50 l/hour) with great absolute pressures without power supply, as well as for improving performance reliability in minimal geometries of metres due to constraint-environment constructability, eg for well location.

2 cl, 2 dwg

FIELD: physics; measuring.

SUBSTANCE: invention concerns to field of diagnostics of a technical state and trial as petrol IC-engines in systems with a forced ventilation of casing (4-6 l/mines), and diesel IC-engines of major power (more than 180 kw) building, road, municipal cars. The rate-of-flow indicator contains the cone-shaped adapter-tip attached to the metal case in which cover is built in rotameter and the gas cock with an adapter. In a case wall the through throttle hole of rectangular section is executed. In the case with possibility of change of the area of a through throttle hole the rotary ring related to a movable arm with a gash, from above restricted to a ring is erected. On the case the rotary ring, with possibility of interaction with a clamping ring of an iris diaphragm, supported by a basic ring and disposed in the case, and fixing possibility in each standing by means of a holdfast containing a blob, a spring and clamping the screw, and also scales are located. Rotameter, the containing blob, is joined with the IC-engine crankcase by means of a metal tube. The invention provides pinch of accuracy and expansion of a gamut of measuring crankcase gases at simultaneous decrease in labour input of diagnosing.

EFFECT: increase of accuracy and expansion of range of measuring crankcase gases at simultaneous decrease in labour input of diagnosing.

5 dwg

FIELD: measuring technique.

SUBSTANCE: method comprises measuring mean values of pressure upstream of the diaphragm, mean values of pressure drop and temperature at the diaphragm with a discreteness equal to the minimum frequency in the spectrum of pulsations in the gas flow, determining varying component of the pressure drop, finding complete values of the pressure upstream of the diaphragm and pressure drop at the diaphragm by adding averaged values of pressure and pressure drop together with their varying component, and determining the mean root square of the production of the calculated complete values of pressure and pressure drop during the measuring cycle, which are used for the determination of the rate of the pulsating gas flow.

EFFECT: enhanced precision.

2 cl, 3 dwg

FIELD: gas industry; transport of gas.

SUBSTANCE: according to proposed method, spectral distribution of gas flow pulsations in gas line is determined. Pressure and temperature before diaphragm are measured as well as pressure differential across diaphragm at frequency at least twice as great as maximum frequency of spectrum of pulsations. Basing on measured parameters, gas flow rate is calculated.

EFFECT: increased accuracy of measurements of gas flow rate owing to exclusion of errors caused by pulsations of gas flow parameters.

3 dwg

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: invention are designed for revealing condition of cylinder-piston group of internal combustion engine by flow rate of gases blowing by from combustion chamber into crankcase through ring seals of pistons. On Warmed up engine oil filler neck of crankcase is opened, and after sealing of crankcase space, housing of flowmeter is fitted on neck. Restrictor is fitted in gas channel of said housing. For each specific type of engine used as restrictor is each of two replaceable diaphragms with different areas of cross sections, smallest one being chosen to conform to preset condition. With engine attaining preset steady operating conditions, flow rate of crankcase gases is determined by pressure drop on restrictor and area of cross section of restrictor by measuring two times of one of said parameters at two preset values of other parameter using dependence given in description of invention.

EFFECT: provision of accurate and reliable measurement of flow rate at reduction of labor input.

7 cl, 1 dwg

FIELD: measuring volume flow or mass flow of fluid.

SUBSTANCE: method comprises mounting at least two standard set of accessories for setting pressure gauges on a pipeline or tank and determining required set by the algorithm proposed.

EFFECT: expanded functional capabilities.

2 cl, 13 dwg

FIELD: measuring engineering.

SUBSTANCE: method comprises measuring static pressure drop in the special measuring section of a pipeline provided with converging part, pressure drop at two flexible members mounted in different cross-sections of the measuring section of the pipeline, density of fluid, linear velocity of flow, and volume and mass flow rates. The device comprises measuring part made of insert and two gauges for measuring static pressure at the wall, the second gauge being mounted on the wall of the converging part of the measuring section. In addition, the measuring section receives two flexible members which are projected to the flow to be exposed to the velocity head.

EFFECT: enhanced accuracy of measuring.

2 cl, 1 dwg

The invention relates to techniques for flow measurement of gas, in particular natural gas

FIELD: measuring engineering.

SUBSTANCE: method comprises measuring static pressure drop in the special measuring section of a pipeline provided with converging part, pressure drop at two flexible members mounted in different cross-sections of the measuring section of the pipeline, density of fluid, linear velocity of flow, and volume and mass flow rates. The device comprises measuring part made of insert and two gauges for measuring static pressure at the wall, the second gauge being mounted on the wall of the converging part of the measuring section. In addition, the measuring section receives two flexible members which are projected to the flow to be exposed to the velocity head.

EFFECT: enhanced accuracy of measuring.

2 cl, 1 dwg

FIELD: measuring volume flow or mass flow of fluid.

SUBSTANCE: method comprises mounting at least two standard set of accessories for setting pressure gauges on a pipeline or tank and determining required set by the algorithm proposed.

EFFECT: expanded functional capabilities.

2 cl, 13 dwg

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: invention are designed for revealing condition of cylinder-piston group of internal combustion engine by flow rate of gases blowing by from combustion chamber into crankcase through ring seals of pistons. On Warmed up engine oil filler neck of crankcase is opened, and after sealing of crankcase space, housing of flowmeter is fitted on neck. Restrictor is fitted in gas channel of said housing. For each specific type of engine used as restrictor is each of two replaceable diaphragms with different areas of cross sections, smallest one being chosen to conform to preset condition. With engine attaining preset steady operating conditions, flow rate of crankcase gases is determined by pressure drop on restrictor and area of cross section of restrictor by measuring two times of one of said parameters at two preset values of other parameter using dependence given in description of invention.

EFFECT: provision of accurate and reliable measurement of flow rate at reduction of labor input.

7 cl, 1 dwg

FIELD: gas industry; transport of gas.

SUBSTANCE: according to proposed method, spectral distribution of gas flow pulsations in gas line is determined. Pressure and temperature before diaphragm are measured as well as pressure differential across diaphragm at frequency at least twice as great as maximum frequency of spectrum of pulsations. Basing on measured parameters, gas flow rate is calculated.

EFFECT: increased accuracy of measurements of gas flow rate owing to exclusion of errors caused by pulsations of gas flow parameters.

3 dwg

FIELD: measuring technique.

SUBSTANCE: method comprises measuring mean values of pressure upstream of the diaphragm, mean values of pressure drop and temperature at the diaphragm with a discreteness equal to the minimum frequency in the spectrum of pulsations in the gas flow, determining varying component of the pressure drop, finding complete values of the pressure upstream of the diaphragm and pressure drop at the diaphragm by adding averaged values of pressure and pressure drop together with their varying component, and determining the mean root square of the production of the calculated complete values of pressure and pressure drop during the measuring cycle, which are used for the determination of the rate of the pulsating gas flow.

EFFECT: enhanced precision.

2 cl, 3 dwg

FIELD: physics; measuring.

SUBSTANCE: invention concerns to field of diagnostics of a technical state and trial as petrol IC-engines in systems with a forced ventilation of casing (4-6 l/mines), and diesel IC-engines of major power (more than 180 kw) building, road, municipal cars. The rate-of-flow indicator contains the cone-shaped adapter-tip attached to the metal case in which cover is built in rotameter and the gas cock with an adapter. In a case wall the through throttle hole of rectangular section is executed. In the case with possibility of change of the area of a through throttle hole the rotary ring related to a movable arm with a gash, from above restricted to a ring is erected. On the case the rotary ring, with possibility of interaction with a clamping ring of an iris diaphragm, supported by a basic ring and disposed in the case, and fixing possibility in each standing by means of a holdfast containing a blob, a spring and clamping the screw, and also scales are located. Rotameter, the containing blob, is joined with the IC-engine crankcase by means of a metal tube. The invention provides pinch of accuracy and expansion of a gamut of measuring crankcase gases at simultaneous decrease in labour input of diagnosing.

EFFECT: increase of accuracy and expansion of range of measuring crankcase gases at simultaneous decrease in labour input of diagnosing.

5 dwg

FIELD: instrument engineering.

SUBSTANCE: invention refers to consumer-supplied working medium metres, e.g. for metering a hydrating inhibitor (methanol) in processing line of gas field and gas wells. In service-pressurised body 2 of the metre, there is a metering unit of a micromanometer 1 under lens 4. In a pass of the body, there is a restriction that is orifice plate 3 pressed with stopper 5. Metering unit 1 of the micromanometer is isolated from contact with the working medium by elastic divider 6 and along with the lens pressed with nut 7 wherein radial holes 8 are formed to increase amount of incident light on a micromanometer scale. The cavity B of the metering unit knot is filled with nonfreezable liquid (silicone liquid or multigrade hydraulic oil).

EFFECT: invention allows for low-flow metering (less than 50 l/hour) with great absolute pressures without power supply, as well as for improving performance reliability in minimal geometries of metres due to constraint-environment constructability, eg for well location.

2 cl, 2 dwg

FIELD: instrument making.

SUBSTANCE: invention is related to measurement equipment and may be used to measure flow rate of fluid mediums by pressure difference. Device comprises tubular body inbuilt in pipeline, inlet and outlet cylindrical portions of which are equal to diametres of pipeline. Between inlet and outlet portions there is a metering section, which is created by direct and reverse cone-shaped measurement channels. diametres of smaller bases of direct and reverse cone-shaped channels are equal to diametres of inlet and outlet cylindrical sections accordingly. Sides of direct and reverse cone-shaped channels with lower bases are connected accordingly with inlet and outlet cylindrical sections. Larger bases of direct and reverse cone-shaped channels have equal diametres and are connected to each other. Besides length of direct cone-shaped channel exceeds length of reverse cone-shaped channel four times. diametres of larger bases of direct and reverse cone-shaped channels exceed diametres of their smaller bases 1.6 times. In cross sections of tubular body there are holes with the first and second nozzles for connection of pressure measurement facilities. At that the first nozzles are provided in area of connection of larger bases of direct and reverse cone-shaped channels, and the second nozzles are provided in outlet cylindrical portion.

EFFECT: higher accuracy of measurements.

1 dwg

FIELD: measurement equipment.

SUBSTANCE: system includes a flow meter having a differential pressure sensor connected parallel to a Venturi tube to a pipeline, and a fraction meter with a double-peak energy source, each of which is functionally connected to a digital processor. In addition, the system includes a pump connected to the pipeline at the flow meter inlet, which injects at least one pulse portion of known amount of liquid, which is sufficient as to volume so that liquid phase can be increased for some time by the amount determined by the flow meter. After the liquid pulse portion is injected into the multiphase flow, the digital processor calculates changes in percentage composition of liquid and gaseous phases, which should have occurred as a result of injection of the pulse portion, and compares the calculated changes to actual changes so that the flow meter can be calibrated. Then, the measured increase in the liquid flow is deducted from full measured liquid flow to determine actual percentage of the liquid flow.

EFFECT: improving measurement accuracy of percentage composition of liquid and gaseous phases in a multiphase fluid, when one phase comprises a small part.

20 cl, 6 dwg

FIELD: gas industry.

SUBSTANCE: invention is used to correct during commercial calculations for actually consumed natural gas in form of fuel for cyclically operating gas consuming equipment. Counter of operation cycles of gas consuming equipment consists of a housing, a pressure relay sensor and an electric pulse counter. Pressure relay sensor in device is connected to gas line. At moment of switching on boiler pressure varies: falls to 20 mbar, rises up to 60 mbar. Pressure relay sensor is mounted at 30-35 mbar, is activated and sends an electric pulse to counter, which counts next cycle, period of time between actuation in operation of gas consuming equipment and its stoppage. Inertial error occurs when water boiler has heated water in system and stops. Gas flow in pipeline stops. Counter continues to rotate by inertia. Total inertia error is determined as product of number of cycles of gas pipeline and value of inertial error of measuring system. Then total inertia error is subtracted from total volume, obtained by measuring system in one month.

EFFECT: technical result is designing a device for counting operation cycles of gas consuming equipment.

1 cl, 1 dwg

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