RU202066U1 - DEVICE FOR TIGHTNESS CONTROL OF LARGE VESSELS - Google Patents

Abstract

The utility model relates to devices for monitoring the tightness of large-volume vessels. Essence: the device contains a reference pressure chamber (2), to which two electrovalves (6, 7) and a differential pressure sensor (8) are connected by means of gas inlet adapters (3-5). A reference pressure chamber (2), electrovalves (6, 7) and a differential pressure sensor (8) are installed in a reference RTD chamber located inside the controlled vessel (1). The device also contains harnesses (12) for controlling the solenoid valves (6, 7) and a differential pressure sensor (8). In addition, the device is equipped with a thermostatting system containing a heater (13), a switching unit (14) with a built-in heater (13) protective shutdown device (15), a PID temperature controller (16), and temperature sensors. Moreover, one of the temperature sensors of the thermostating system is installed on the heater (13), and the other temperature sensors are installed on the surface and inside the controlled vessel (1). EFFECT: increased accuracy of tightness control. 2 wp f-ly, 1 dwg

Description

The utility model belongs to the field of testing technology and can be used to test the tightness of large-volume vessels using a reference chamber.

As an analogue, consider the technical solution "Method of testing for tightness" (see patent RU No. 2290617, G01M 3/00, publ. 27.12.2006, bull. No. 36).

The invention relates to the field of testing technology and is aimed at providing an inexpensive method for testing the tightness of closed vessels, provided that one of the filling products is a liquid component, which provides a short test cycle and high measurement accuracy.

This result is achieved by placing the test vessel in a test chamber which is evacuated to at least the vapor pressure of this liquid component. Control the pressure in the surrounding space and thus in the test chamber.

The control is carried out by a vacuum pressure sensor, while the decrease in the pressure surrounding the vessel of space is carried out by a vacuum pump.

A leak is detected by monitoring the change in pressure in the surrounding space, which occurs due to the evaporation of the liquid leaving the leak and evaporating into the surrounding space at lower pressure.

The disadvantage of the analogue is the need to fill the internal volume of the test vessel with a liquid component.

As a prototype, a device for monitoring the tightness of large-volume vessels (p. RF No. 123948, publ. 01/10/2013) was chosen, which is a compact unit located inside the closed volume of the tested vessel, and containing a reference pressure chamber with connected to it hermetically sequentially using gas inlet adapters with two solenoid valves, a differential pressure sensor installed in the reference thermo-resistance chamber, as well as harnesses for controlling the devices of the device and monitoring their readings through the pass-through thermoelements of the tested vessel, a safety valve is introduced to the control and recording equipment located outside the vessel. The safety valve has a pressure limiting range.

The disadvantage of the device is the effect of the ambient temperature on the results of monitoring the tightness of large-volume vessels.

When monitoring the tightness of large-volume metal vessels (up to 10 m ³ ) by the manometric method by supplying excess pressure (including the differential-manometric method using a reference chamber), the change in pressure is monitored for a certain time to detect leaks. Depending on the requirements for the controlled leak rate, the measurement time can be tens of hours. In this case, it is most important to eliminate the influence of temperature on the control results.

The technical result of the utility model is to improve the accuracy and reliability of the tightness control by reducing the influence of the ambient temperature on the controlled vessel.

The technical result is achieved by the fact that the device for monitoring the tightness of large-volume vessels contains a reference pressure chamber installed inside the vessel with two electrovalves connected to it hermetically sequentially by means of gas inlet adapters, a differential pressure sensor installed in the reference thermal resistance chamber, as well as control harnesses for device devices and control over their readings through the passage thermoelements of the inspected vessel to the control and recording equipment located outside the vessel. A thermostatting system is introduced into the device, containing at least one heater, a switching unit with at least one built-in heater circuit breaker, a PID temperature controller, temperature sensors, one of which is installed on the heater, others are installed on the surface and inside the controlled vessel. The heater can be a heating cable covering the vessel to be monitored. Additional thermal insulation can be installed on the controlled vessel, consisting of at least one insulation.

FIG. 1 shows a functional diagram of a device for monitoring the tightness of large-volume vessels containing a thermostating system.

A device for monitoring the tightness of large-volume vessels 1 consists of a reference pressure chamber 2, with connected to it hermetically through the gas inlet adapters 3, 4, 5, successively two electrovalves 6, 7, a differential pressure sensor 8, installed in the reference chamber of thermal resistances, safety valve 10, hermetically connected by pipeline 11 with the reference chamber 2, as well as connecting harnesses 12. A heating cable is installed on the outer surface of the controlled vessel 1 13. The heating cable is connected to the ~ 220 V electrical network through a residual current device 15 built into the switching unit 14. - the regulator 16 turns on or off the power supply of the heating cable depending on the readings of the regulating temperature sensor 17 and the set PID control coefficients. The measuring temperature sensor 18, together with the regulating temperature sensors, controls the unevenness of the thermal stabilization of the vessel. Additionally, computer 19 can be used to set the thermal stabilization temperature and PID control coefficients, as well as collect measurements from temperature sensors to document the thermal stabilization process.

The order of the tightness test is as follows:

- depending on the overall, mass and thermal characteristics of the controlled vessel:

- 1, 2 or 3 heating cable sections are installed on the test vessel;

- the temperature of the thermal stabilization and the coefficients of the PID control are entered into the PID controller.

- compressed air is supplied to the vessel until a steady test pressure is obtained, with the electrovalves of the reference chamber open. After cessation of air supply and equality of the established test pressure in the reference chamber and in the controlled vessel, the solenoid valves are closed.

- at the same time, the vessel is heated to the temperature of thermal stabilization at a rate of at least 0.5 ° C / hour with a vessel weight of up to 30 tons;

- during the time required to check the tightness:

the temperature of the vessel body is maintained equal to the temperature of thermal stabilization with an accuracy of ± 0.5 ° C at an ambient temperature of 10 to 30 ° C;

- registration of the change in the pressure drop according to the readings of the pressure drop sensor is performed by outputting information through the passage thermoelements of the tested vessel to the control and recording equipment located outside the vessel;

- on the basis of these readings, leaks are calculated and conclusions are drawn about the tightness of the tested vessel.

- after completion of the control of the vessel tightness, the thermal stabilization system is turned off.

FIG. 1 shows three sections of heating cable (I, II, III) with the corresponding equipment described above. Additional thermal insulation is not specified.

Claims (3)

1. A device for monitoring the tightness of large-volume vessels, containing a reference pressure chamber installed inside the vessel with two electrovalves connected to it hermetically sealed in series with the help of gas inlet adapters, a differential pressure sensor installed in the reference thermal resistance chamber, as well as harnesses for controlling the devices of the device and monitoring their indications, passing through the thermoelements of the tested vessel to the control and recording equipment located outside the vessel, characterized in that the device is equipped with a thermostatting system containing at least one heater, a switching unit with at least one built-in safety shutdown device for the heater, a PID controller temperature, temperature sensors, one of which is installed on the heater, others are installed on the surface and inside the controlled vessel. 2. A device according to claim 1, characterized in that the heater is a heating cable that encloses the controlled vessel. 3. A device according to claim 1, characterized in that additional thermal insulation is installed on the controlled vessel, consisting of at least one insulation.

Images