RU2699934C1 - Test bench for testing respiratory and safety valves of tanks with oil and oil products - Google Patents

Abstract

FIELD: test technology.

SUBSTANCE: invention relates to stands for control and testing of respiratory and safety valves, in particular, valves of reservoirs, and is intended for check of operability for actuation and determination of maximum efficiency of reinforcement. Test bench for testing respiratory and safety valves of reservoirs comprises a compressor-vacuum device, pressure and vacuum sensors, control cabinet, inlet and outlet branch pipes connected to air flow rate measuring unit containing pipeline with detachable diaphragm; at that, two differentiated pressure sensors installed at equal distance before and after detachable diaphragm and resistance sensor are located in pipeline cavity.

EFFECT: high efficiency of operation of the stand due to the possibility of the test bench to test the valves of different diameters while ensuring high accuracy and reliability of test results with possibility of visualizing the tests.

1 cl, 2 dwg

Description

The invention relates to stands for monitoring and testing of respiratory and safety valves, in particular valves of tanks, and is intended to verify the operating parameters of respiratory and safety valves.

The prior art stand for tuning the breathing valves of tanks related to devices for checking and adjusting the breathing valves of technological tanks during transport and storage of oil and oil products (RF patent No. 2363934, publ. 10.08.2009). The reservoir breathing valve adjustment stand includes a vacuum-pressure unit with switching valves, is equipped with a portable remote unit consisting of a vacuum-pressure chamber, a plug flange and a connecting flange made of light non-sparking material, such as aluminum, control valves, a pressure gauge , flame arrester and flexible connecting hose. A lightweight remote unit is inserted between the adjustable breathing valve and the fire damper on the roof of the tank, and the pressure / vacuum unit is installed at the base of the tank.

The disadvantage of this device is the inability to determine the air flow through the test valve at overpressure and vacuum.

The closest analogue of the claimed invention is a test bench for breathing and safety valves of tanks and a device for its use, related to test equipment for investigating the health of breathing and safety valves that are installed on breathing tubes located on the roofs of tanks with oil or oil products (RF patent No. 82490, published April 27, 2009). The test bench for breathing and safety valves of tanks and a device for its use includes an annular flange for mounting the valve on one of the ends of this flange and tightly connecting the valve inlet to the central hole of this flange, a vacuum-compressor device to create a pressure or vacuum for actuating the valve , instrument for measuring pressure or vacuum of valve actuation and piping.

The disadvantage of this device is the inability to determine the air flow through the test valve at overpressure and vacuum.

The technical task of the claimed test bench is to develop a test bench design for testing the respiratory and safety valves of the tanks, which provides the ability to determine the actual technical characteristics of the tested valves in the entire operating range in order to verify the conformity of manufacturers' products with the technical requirements and further calculate the required number of respiratory valves on the tank during design and tank operation and flow measurement during air through test valves at overpressure and vacuum.

The technical result achieved by the implementation of the claimed invention is to increase the efficiency of the stand due to the ability of the stand to test valves of various diameters while ensuring high accuracy and reliability of the test results with the ability to determine the air flow through the test valve at overpressure and vacuum.

The claimed technical result is achieved due to the fact that the stand for testing breathing and safety valves of tanks with oil and oil products, containing a vacuum compressor, pressure and vacuum sensors, a control cabinet, inlet and outlet pipes for installing the test sample, connected to the measurement unit air flow containing a pipeline, in the cavity of which is placed a removable diaphragm, two differential pressure sensors installed at the same distance to and along le removable diaphragm and the sensor resistance, wherein at the juncture of the compressor-vacuum device with an outlet mounted air valve for switching on / off the compressor and the vacuum device, depending on the operating mode of the stand.

In addition, the compressor-vacuum device can be made in the form of a radial fan connected to a frequency-controlled electric motor.

The invention is illustrated graphically, where in FIG. 1 shows a general view of the stand, and in FIG. 2 shows a top view of the stand

With reference to the drawings of FIG. 1 and FIG. 2 are indicated:

1 - outlet pipe;

2 - the base of the stand;

3 - control cabinet;

4 - resistance sensor;

5 - radial fan;

6 - fan motor;

7 - air valve;

8 - connecting point for the test sample;

9 - gauge overpressure;

10 - vacuum pressure sensor;

11 - differential pressure sensor;

12 - inlet pipe;

13 - removable diaphragm;

14 - pipe to accommodate pressure and resistance sensors.

The test bench for breathing and safety valves of reservoirs with oil and oil products, made in figure 1, 2, contains the base of the bench 2, the inlet pipe 12 for installing the test valve and measuring pressure-vacuum / air flow measurement and the outlet pipe connecting 1 for installation test valve and measuring overpressure / air flow.

The outlet and inlet pipes 1, 12 have the appropriate dimensions and the necessary holes for fasteners and are connected to the air flow metering unit.

The air flow measurement unit is a pipe 14, in the center of which a removable diaphragm 13 is installed to control the measurement range when determining the air flow through the valve at overpressure or discharge. In the cavity of the pipe 14 there are two sensors for differential pressure 11 and resistance 4.

To create a test pressure, a compressor-vacuum device is used, which is a radial fan 5 connected to the drive of the electric motor 6. The rotation speed of the electric motor is regulated using a frequency converter. To switch the stand to the modes of creating a vacuum or overpressure, the stand contains an air valve 7.

Measurement of the air pressure at overpressure is carried out using an overpressure sensor 9 installed in front of the connecting pipe 1. During discharge, a vacuum pressure sensor 10 is installed in front of the inlet pipe 12. Air flow measurement is carried out using a resistance sensor 4, two differential pressure sensors 11 installed at the same distance before and after the removable diaphragm 13. The measurement results are displayed on the screen of the DVR (not shown in Fig.) located in the control cabinet 3.

The operation of the stand is controlled through the control cabinet 3, which houses the power switches of the electrical equipment of the stand, the controls of the frequency converter for changing the speed of the electric motor of the engine and the video graphic paperless recorder, designed to measure, register, visualize and convert electrical signals from sensors and devices, as well as calculate flow rate

Determination of pressure-vacuum at which the valve is triggered.

Install the test valve in the closed state on the inlet 12 connected to the radial fan 5. The vacuum pressure sensor 10 is connected to the DVR. The radial fan 5 is started with a gradual increase in the rotation speed of the electric motor 6 of the radial fan 5 and the vacuum pressure and flow rate to the DVR are recorded. The valve actuation moment is characterized by a sharp change in the flow rate on the display. The resulting value is entered in the test report.

Determination of excess valve response pressure.

Install the test valve in the closed state on the outlet pipe 1. The inlet pipe 12 should be disconnected from the radial fan 5. The overpressure sensor 9 is connected to the DVR. The radial fan 5 is started with a gradual increase in the rotational speed of the drive of the electric motor 6 of the radial fan 5 and the overpressure and air flow are recorded on the DVR. The valve opening moment is characterized by a sharp change in the air flow rate indicator on the display. The resulting value is entered in the test report.

Determination of air flow through the valve at overpressure

The test valve is installed on the outlet pipe 1. The inlet pipe 12 is disconnected from the radial fan 5. The differential pressure sensor 11 and the resistance sensor 4 are connected to the DVR. To measure the air flow rate within the specified limits, it is necessary to install a removable diaphragm 13 corresponding to the measured flow range.

Determination of air flow through the valve at discharge pressure

Install the test valve on the inlet 12. The inlet 12 should be connected to the radial fan 5. The differential pressure sensor 11 and the resistance sensor 4 are connected to the DVR. To measure the flow within the established limits, it is necessary to install a removable diaphragm 13 corresponding to the measured flow range.

The radial fan 5 is started up with a gradual increase in the rotational speed of the engine 6 of the radial fan 5, while the overpressure and the flow are recorded on the recorder. After the unit reaches steady state, air flow is recorded. The resulting value is entered in the test report.

The claimed stand for testing respiratory and safety valves of tanks provides the ability to control pressure readings, throughput of respiratory and safety valves of tanks, their numerical values and a graphical display of the dependence of throughput on pressure.

Claims (2)

1. The test bench for breathing and safety valves of tanks with oil and oil products, containing a compressor-vacuum device, pressure and vacuum sensors, characterized in that it contains a control cabinet, inlet and outlet nozzles for installing the test sample, connected to the unit for measuring air flow comprising a pipeline in the cavity of which a removable diaphragm is located, two differential pressure sensors installed at the same distance before and after the removable diaphragm, and a sensor resistance, at the same time, an air valve is installed at the junction of the compressor-vacuum device with the outlet pipe to ensure that the compressor-vacuum device is turned on / off, depending on the operating mode of the stand. 2. The stand under item 1, characterized in that the compressor-vacuum device is a radial fan connected to an electric motor with frequency regulation.

Images