RU102995U1 - INSTALLATION FOR TESTING TUBE-PISTON INSTALLATIONS - Google Patents

Abstract

 Installation for checking pipe-piston installations, (TPU) characterized in that it contains a hydraulic system for creating and controlling the flow of calibration fluid through the TPU being verified, including a storage tank designed to store calibration fluid, a pump for supplying calibration fluid from the storage tank to TPU , pointer and flow controller to set the selected value of the verification fluid flow; a device for collecting and measuring the volume and parameters of the liquid, including a measuring device, designed to determine the metrological characteristics used as an indicator of the flow rate of the volumetric liquid meter, the conversion coefficient of which is calculated by the determined volume of water in the measuring device when the flow rate set for determining the metrological characteristics of the meter and generated during filling measuring device to the number of counter pulses taking into account the temperature and pressure in its measuring line and the temperature in rows in the measuring tank, thermometers, pressure gauges for measuring the water temperature and pressure at the inlet and outlet TPU; and including a control unit for controlling the calibration unit, a device for collecting, processing information and recording measurement results, to the corresponding inputs of which are the position signals of the 4-way TPU valve, signals of the detectors that limit the calibrated section of the TPU, pulse signals of the liquid meter, signals of pressure transducers and temperature of the meter’s measuring line , signals from pressure and temperature transducers in the measuring device, signals from pressure and temperature transducers TPU, which is based on signals detective

Description

The utility model relates to the oil industry, and in particular to plants designed for primary and periodic verification of pipe-piston plants (hereinafter - TPU) of all types with a throughput of 100 to 4000 m3 / h.

At present, the verification of pipe-piston installations is carried out in accordance with the following regulatory documents:

[1] MI 1972-95. Recommendation. GSOEI. Piston testing units. Calibration method by installing on the basis of the OGV scales or measuring devices.

[2] Instruction. GSOEI. Piston testing units. Verification method using a calibration installation based on standard measuring devices (approved by GNMC FSUE VNIIR July 18, 2006).

Verification of TPU includes the following operations:

- determination of metrological characteristics (MX): TPU capacity, standard deviation of the random error component, boundaries of the total systematic error component, relative error;

- check for fluid leaks;

- determination of the relative deviation of the TPU capacity from the value during the previous verification.

The main parameter, which is the initial one for calculating other metrological characteristics, is an indicator characterizing TPU capacity (volume of a calibrated section).

The method for determining the capacity of TPU according to [1] is based on the fact that water (test fluid) displaced from the TPU when the ball piston moves along a calibrated section from one detector to another is sent to a special storage tank and its volume is measured. Water is directed into the tank either using a flow switch controlled by the signals of the detectors or by stopping the piston by shutting off the flow: stopping the piston on the first detector, the TPU outlet is connected to the tank, then, after displacing water from the calibrated section into the tank, the piston on the second detector is stopped . The volume of water is measured indirectly (using weights and hydrometers) or by a direct method (measurer) draining it from the storage tank. The volume of water can be measured without a storage tank, directly directing the flow of water into the meter, stopping the piston in the calibrated area after each filling of the meter, and without stopping the piston.

Depending on the selected method for determining the capacity of the calibrated section, various equipment is also used:

1. Testing installation on the basis of exemplary cargo piston scales (OGV) with a storage tank and a flow switch.

2. Calibration unit based on measuring devices with storage capacity and flow switch.

3. Testing installation on the basis of OGV or measuring devices with accumulative capacity with a piston stop.

4. Testing installation on the basis of measuring devices with a piston stop without a storage tank.

5. Testing installation on the basis of measuring devices without stopping the piston and without storage capacity.

The closest set of essential features to the claimed utility model is the one adopted for the prototype, known (subclauses 6.2.1., 6.3.2., Fig. 1 MI 1972-95. Recommendation. GSOEI. Tube-piston calibration plants. Verification method by installing on the base of the OGV weights or measuring devices) a calibration unit based on a measuring device with a storage tank and a flow switch, which contains a hydraulic system for creating and controlling the flow rate of the test liquid through the TPU being verified, including a storage tank designed to store liquid; a pump for supplying the test fluid from the storage tank to the TPU, a flow indicator and a flow regulator for setting the selected value of the test fluid flow, a fluid flow switch, a device for collecting and measuring the volume of fluid, including a measuring device and thermometers and manometers for measuring water temperature and pressure TPU input and output, and a device for collecting, processing information and recording measurement results, including an information processing device, to the corresponding inputs of which output signals are supplied ermometrov and pressure gauges, which measure the temperature and pressure at the inlet and outlet of the TPU, the time interval measurements of the motion of the piston and BU calibration unit, which receives signals from the calibrated restriction portion TPU detectors.

The disadvantages of the adopted prototype of a known device that impedes the achievement of the following technical result include:

- the need for storage capacity and its large dimensions;

- the complexity of verification (When calibrating TPU with an average capacity of 2000 m ³ / h with a calibrated section volume of 20 m ³ using a verification technique with installation on the basis of OGV or measuring scales, it is necessary to start the ball piston and the volume limited by a pair of detectors, pour it into an intermediate container of 10 m ³ , after which this volume is measured with 10 measuring tanks, each time waiting for air bubbles to escape, and when the water is drained from the measuring device, drops will be drained. During calibration, it is necessary to fill / drain the container 20 times, and the measuring tank 200 times.)

- the human factor (each time when filling the measuring unit, the operator needs to accurately measure the volume of the measuring unit, ie, determine the position of the meniscus of the measuring unit “by eye”).

The task to which the present utility model is directed is to modernize the measuring equipment of the oil and gas industry.

The technical result achieved by using the inventive utility model is to automate the process of measuring the volume of TPU and, accordingly, a significant reduction in the verification time of TPU.

The specified technical result is achieved by the fact that the installation for checking pipe-piston installations is characterized by the fact that it contains a hydraulic system for creating and controlling the flow of the test fluid through the TPU being verified, including a storage tank designed to store the test fluid, a pump for supplying the test fluid from the tank - storage in TPU, pointer and flow regulator to set the selected value of the verification fluid flow; a device for collecting and measuring the volume and parameters of the liquid, including a measuring device, designed to determine the metrological characteristics used as an indicator of the flow rate of the volumetric liquid meter, the conversion coefficient of which is calculated by the determined volume of water in the measuring device when the flow rate set for determining the metrological characteristics of the meter and generated during filling measuring device to the number of counter pulses taking into account the temperature and pressure in its measuring line and the temperature in rows in the measuring tank, thermometers, pressure gauges for measuring the water temperature and pressure at the inlet and outlet TPU; and including a control unit for controlling the calibration unit, a device for collecting, processing information and recording measurement results, to the corresponding inputs of which are the position signals of the 4-way TPU valve, signals from the detectors that limit the calibrated section of the TPU, pulse signals from the liquid meter, signals from pressure transducers and temperature of the measuring line counter, signals from pressure and temperature transducers in the measuring device, signals from pressure and temperature transducers TPU, which carries out a signal m TPU detectors; counting pulses from the counter over the interval of time the piston moves between the detectors, the ratio of the number of which to the conversion coefficient of the counter, calculates the capacity of the TPU; calculation of instantaneous fluid flow; control of the TPU four-way valve, designed to change the direction of the TPU fluid; the conversion of the parameters of the input electrical signals into values and their display on the display; data entry, registration and processing of measurement results; indication of the current values of the measured values on the display; formation, reflection and printing of verification protocols.

The principle of verification using the declared installation on the basis of the measuring device and volumetric meter is based on the fact that the volumetric meter works as a comparator, with the help of which the volume of the measuring device of the first category is transmitted to the verified TPU. Those. the meter is calibrated using a measuring device, and then the TPU volume is determined using the meter in an automatic mode without stopping the ball piston.

In this case, the measuring device is the standard of volume, which serves to transfer the unit volume of TPU indirect method through the counter-comparator. The TPU volume is equal to the ratio of the number of pulses from the counter over the interval of time the piston moves between the detectors to the conversion coefficient of the counter-comparator.

To switch the medium flow during the verification of bidirectional TPU, a four-way valve is used, which is part of the TPU. When calibrating bidirectional TPUs, if the storage capacity is sufficient, it is possible to immediately determine the total capacity of TPUs. In special cases, the installation can be used:

- filters to protect measuring instruments from ingress of mechanical impurities;

- level switch to protect the pump from "dry running" and from overflow of water.

To clarify the essence of the utility model, a technological scheme of the installation based on a measuring device and a volume meter is presented.

Below, on the example of a reference calibration unit (EPU), designed for primary and periodic verification of TPU with a throughput of 100 to 4000 m3 / h, information is provided that confirms the implementation of the utility model to obtain the above technical result.

EPU TPU consists of two modules, structurally assembled on separate frame structures. To ensure fluid flow between the processing equipment of the modules and the TPU being verified, high pressure hoses Du50 and Du25 are provided.

Module I of the TPU verification device contains the following technological equipment: measuring device 1 reference scale of the 1st category with the limits of the permissible basic error of 0.02% and a nominal capacity of 1000 dm3, the location of which provides free access to ball valves designed to empty and fill the measuring device; volumetric liquid meter (hereinafter referred to as the comparator counter) 2 (positive displacement chamber with a standard deviation of the random error component of not more than 0.015%, nominal flow rate of 6-60 m3 / h, vane model ST-75-SS), which is also a converter flow rate (counter, flow meter, flow transducer), which, with the help of a device for collecting, processing information and recording measurement results (UOI), calculates the instantaneous flow rate (flow rate indicator); pressure and temperature transducers of the measuring line (pipeline section with a counter-comparator installed on it, temperature and pressure transducers, thermometer and manometer) counter: overpressure transducer 3, characterized by an upper measurement limit of 1.0 MPa, a margin of permissible basic error of 0.25% and an output signal of 4 -20 mA, pressure gauge 4 with an upper measurement limit of 1.0 MPa, accuracy class 0.6; a temperature transducer 5 complete with a thermal resistance of class A, characterized by an error of 0.2 ° C and an output signal of 4-20 mA, a thermometer 6 glass with a division value of 0.1 ° C (error of 0.2 ° C); centrifugal electric pump 7 with a capacity of 5 m ³ / h and a pressure of 46 m, designed to drain water from the measuring unit; fine filter 8, flow regulator 9 for setting the value of the verification fluid flow rate, stop valves (taps and check valves) and a device for collecting, processing information and recording measurement results (UOI) 10 with the control unit of the calibration unit. Mernik is equipped with temperature converters 20 and 21 installed in thermowells.

UOI is a measuring and computing complex IMC-3 with the limits of the permissible basic error of measuring the number of pulses 0.01%, which includes a pulse counter, which is an electronic device that counts the number of pulses from the counter-comparator of the liquid (flow transducer) 2.

OOI provides the following basic functions:

- control of the TPU four-way valve, designed to change the direction of the TPU fluid;

- reception of signals:

- provisions of the 4-way TPU valve,

- signals of TPU detectors, - pulse signal of a liquid meter,

- pressure transmitter measuring line of the counter-comparator,

- temperature transducer of the measuring line of the counter-comparator,

- TPU pressure transducer

- TPU temperature converter;

- the conversion of the parameters of the input electrical signals into values (temperature, pressure, number of pulses) and their display on the display of the UOI;

- providing data input;

- processing of measurement results;

- indication of the current values of the measured values;

- processing of measurement results;

- formation, reflection and printing of verification protocols.

Module II of the TPU verification device contains the following processing equipment: storage tank 11 for the test liquid with a nominal volume of 11000 dm ³ ; electric centrifugal pump 12 with a capacity of 70 m ³ / h and a pressure of 80 m, designed to supply fluid from a tank to a TPU; flow regulator 13 to select the optimal mode of operation of the pump when the flow stops (pump discharge) a manometer 14 with an upper measurement limit of 1.0 MPa and an accuracy class of 1.5 for measuring pressure in the measuring line; and stop valves (taps 15, 16, 17, 18, 19 and check valves).

In the manufacture of this installation, the use of other measuring instruments with the same or better metrological characteristics is allowed.

All pipelines, transitions, flanges, clamps, filters, valves, check valves are made of anticorrosive materials, coated inside and out with a durable anti-corrosion compound.

TPU verification is carried out in the following order under the following conditions:

- ambient temperature, deg. FROM from 10 to 30 - test fluid drinking water - temperature of the test fluid, deg. FROM from 10 to 30 - pressure of the test fluid at the outlet of TPU, MPa, not less 0.1

- free gas content in the test fluid is not allowed

- deviation of the calibration flow from the set value during the verification process <2.5% - change in the temperature of the test fluid in the TPU during the passage of the piston in one direction (from one detector to another) <0.2 deg C - change in the temperature of the test fluid near the counter-comparator of the fluid during the filling of the measuring device <0.2 deg C

The value of the verification flow rate (Q1, m3 / h), at which the metrological characteristics are determined, and the value of the flow rate (Q2, m3 / h), at which the absence of leaks are controlled, are established on the basis of the following conditions:

- the value of the flow rate Q1 should not less than 2 times the value of Q2;

- the flow rate is selected within the range in which MX TPU are rated.

1. Conduct preparatory work:

Fill the storage tank with test liquid, the amount of which should exclude the possibility of air entrainment by the pump. The taps 15, 16, 17 are opened, the pump 12 is turned on, and using the flow controllers 9 and 13, they establish through the flow chart the value of the calibration fluid flow Q1 according to table 1 (recommended calibration fluid flow rates when testing TPU).

Table 1 Conditional diameter of the calibrated section, mm Q1, m ³ / h Q2, m ³ / h 150-250 6.0-20.0 3.0-10.0 300-500 18.0-30.0 9.0-15.0 600-920 18.0-40.0 9.0-20.0

Perform several starts of the TPU ball piston, while opening the air valves installed on the TPU at the top points.

According to the verification procedure, to correctly determine the volume of liquid, the meter’s walls are wetted with water, for which the tap 18 is opened and the tap 15 is closed. After the meter is filled to the nominal capacity, the tap 18 is closed and the tap 15 is opened. The meter tap 19 is opened and the pump 7 is turned on for emptying of the measuring device. After emptying the meter, turn off the pump 7, having stood for 1 min., Close the outlet valve 19 of the meter.

2. Determine the metrological characteristics (conversion coefficient) of the liquid meter.

The determination of the metrological characteristics of the liquid meter is performed in two series of five measurements each. The first series is performed before determining the metrological characteristics of TPU, the second after.

When the flow rate Q1 is established in accordance with the measurement procedure, the valve 15 is closed, the current value of the number of pulses generated by the liquid counter 2 and measured by the UOI are reset to zero. The valve 18 is opened and the meter is filled, controlling the filling process on the meter scale and by the number of pulses generated by the counter 2. In the process of filling the meter, the temperature and pressure of the test liquid are recorded in the measuring line of the liquid counter 2. The arithmetic mean values at the beginning and end of the filling of the measuring device are taken as the temperature and pressure during the measurement. After filling the meter, the valve 18 is closed, the value of the number of pulses generated by the counter-comparator and measured by the OOI is read from the UOI display. Open the faucet 15. 1 minute after filling the measuring device, determine the volume of water in it on a scale on the neck and take readings from the temperature transducers 20 and 21 installed in the thermowells of the measuring device. Open the outlet tap 19 of the meter, turn on the pump 7 to drain the water. After draining the water from the meter, turn off the pump 7 and after 1 minute close the drain tap of the meter.

As a result, the conversion coefficient (the ratio of the number of pulses of the counter-comparator to the known volume of the meter) of the counter-comparator is calculated from the determined amount of water in the measuring device and the number of pulses of the counter-comparator generated during its filling, taking into account the temperature and pressure in its measuring line and the water temperature in the measuring device . The beginning and end of the process of filling the measuring device and, accordingly, the pulse generation interval by the counter-comparator is determined by the signals of the TPU detectors during the passage of the calibrated section of the TPU with a ball piston.

3. Determine the metrological characteristics of TPU.

Run the TPU ball piston. When the piston passes the first detector in the IOI, it starts, and when the second detector passes, the counting of pulses from the counter-comparator ends. In the process of passing the calibrated TPU section with a ball piston, the temperature and pressure of the test liquid are also recorded in 1 measuring line of the comparator counter and at the input and output of the TPU.

When calibrating bidirectional TPUs, the previous operations are repeated to move the ball piston in the opposite direction.

Perform seven measurements.

4. They process the measurement results of metrological characteristics of TPU.

The capacity of the measuring section of TPU under standard conditions is determined according to MI 3155-2008 “Recommendation. GSOEI. Piston testing units. Verification procedure with calibration facilities based on a measuring device and a volumetric meter. ”

5. Check for leaks, for which they set the flow rate Q2 selected to check for leaks in accordance with the table, perform the necessary measurements to determine the conversion coefficient of the counter-comparator and the capacity of the measuring section of TPU under standard conditions.

table 2 Conditional diameter of the calibrated section, mm Q1, m ³ / h Q2, m ³ / h 150-250 6.0-20.0 3.0-10.0 300-500 18.0-30.0 9.0-15.0 600-920 18.0-40.0 9.0-20.0

Using the flow controllers 4 and 13 set the selected value of the verification fluid flow. A volume counter-comparator 2 is used as a flow indicator.

Claims (1)

Installation for checking pipe-piston installations, (TPU) characterized in that it contains a hydraulic system for creating and controlling the flow of calibration fluid through the TPU being verified, including a storage tank designed to store calibration fluid, a pump for supplying calibration fluid from the storage tank to TPU , pointer and flow controller to set the selected value of the verification fluid flow; a device for collecting and measuring the volume and parameters of the liquid, including a measuring device, designed to determine the metrological characteristics used as an indicator of the flow rate of the volumetric liquid meter, the conversion coefficient of which is calculated by the determined volume of water in the measuring device when the flow rate set for determining the metrological characteristics of the meter and generated during filling measuring device to the number of counter pulses taking into account the temperature and pressure in its measuring line and the temperature in rows in the measuring tank, thermometers, pressure gauges for measuring the water temperature and pressure at the inlet and outlet TPU; and including a control unit for controlling the calibration installation, a device for collecting, processing information and recording measurement results, to the corresponding inputs of which are the position signals of the 4-way TPU valve, signals from the detectors that limit the calibrated section of the TPU, pulse signals from the liquid meter, signals from pressure transducers and the temperature of the meter’s measuring line , signals from pressure and temperature transducers in the measuring device, signals from pressure and temperature transducers TPU, which is based on signals TPU detectors; counting pulses from the counter over the interval of time the piston moves between the detectors, in relation to the number of which the counter conversion coefficient calculates the TPU capacity; calculation of instantaneous fluid flow; control of a 4-way TPU valve designed to change the direction of TPU fluid; converting the parameters of the input electrical signals into value values and displaying them on the display; data entry, registration and processing of measurement results; indication of the current values of the measured values on the display; formation, reflection and printing of verification protocols.