WO2009065972A1 - Method and device for checking leaktightness and/or detecting leaks in tanks - Google Patents

Method and device for checking leaktightness and/or detecting leaks in tanks Download PDF

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Publication number
WO2009065972A1
WO2009065972A1 PCT/ES2007/000665 ES2007000665W WO2009065972A1 WO 2009065972 A1 WO2009065972 A1 WO 2009065972A1 ES 2007000665 W ES2007000665 W ES 2007000665W WO 2009065972 A1 WO2009065972 A1 WO 2009065972A1
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Prior art keywords
tank
pressure
tanks
analysis
techniques
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PCT/ES2007/000665
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Spanish (es)
French (fr)
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WO2009065972A8 (en
Inventor
Maria Jose Palomo Anaya
Gumersindo Jesús VERDU MARTIN
Javier Almela Cebria
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Net, S.A.
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Application filed by Net, S.A. filed Critical Net, S.A.
Priority to PCT/ES2007/000665 priority Critical patent/WO2009065972A1/en
Publication of WO2009065972A1 publication Critical patent/WO2009065972A1/en
Publication of WO2009065972A8 publication Critical patent/WO2009065972A8/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/32Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators

Definitions

  • the present invention refers to a method and device for verifying tightness and / or detection of leaks in tanks, especially in storage facilities for liquid petroleum products and chemical products and arises for comply with the legislative requirements on buried single wall tanks that belong to these facilities, requirements that are mandatory before putting these tanks into service, to carry out tests, after cleaning and inspection and / or internal repair (as indicated in report UNE 53 991 IN), and before its definitive burial (tests are called at the site).
  • the invention consists of three parts: 1) Selection of the instrumentation and devices suitable for testing in empty and degassed tanks, with the necessary safety and with a leak detection guarantee of the order of 100 ml / h, (required by current legislation), as well as the equipment for the acquisition and sending of the signals of the said instrumentation to a laptop.
  • the methods that work causing a depression in the tanks have the following disadvantages: a) Subject to structural forces, to the tanks, which in normal conditions do not exist, b) Increase the likelihood of a leakage plugging outside the tank. c) They have limited the level of maximum depression to which they can be subjected to 200 mb, so there is a limitation in the column height of liquid product that may exist in the tank at the beginning of the test execution process. In conclusion, there is no method or system that is capable of issuing a totally reliable diagnosis about the tightness of a tank, if the test is carried out with a liquid phase product inside, since the diversity of initial conditions described, on which these tests with liquid product are developed, it has a considerable influence on the diagnosis.
  • the invention presented is the first system developed and effective to be applied in empty and degassed tanks, that is, tanks that have been cleaned and degassed, to be inspected, or tanks that have been repaired or installed for the first time.
  • empty and degassed tanks that is, tanks that have been cleaned and degassed, to be inspected, or tanks that have been repaired or installed for the first time.
  • this system we can verify the tightness of the installation and therefore guarantee the protection of the environment.
  • a "preventive maintenance" is implemented, since air leaks can be detected through defects, holes, cracks, etc., of the tank structure, before they can cause product losses.
  • the method and device for checking the tightness and / or detection of leaks in tanks object of the invention, allows to perform the tightness test, once the relevant connections have been made, subjecting the tank to an increase in internal pressure , this increase being limited to a maximum of 0.75 bar, or less, if the corresponding national and / or European regulations so indicate.
  • the system initiates a process of acquiring the pressure signals captured by a sensor inside it, signals to which it applies conditioning techniques and analysis techniques (simultaneously, in the domain of time and in the frequency domain), and when the analysis and monitoring of the parameters of the aforementioned pressure signals determine the leakage or leakage condition, the test diagnosis is automatically issued.
  • the techniques used by the system are:
  • the system in addition to issuing a diagnosis about the tightness, can determine characteristic patterns of defects associated with fluid leaks and parameterize the characteristics of the tank, that is, provide an averaged "spectral signature" to the entire stage of tightness analysis and establish a pattern to follow for the preventive and predictive maintenance of the tank.
  • the detection capacity of the system is based on the application of the aforementioned techniques to several hundred tests carried out in various conditions to tanks between 5 and 50 m3 in volume.
  • connection devices of the invention To visualize the connection devices of the invention and forming an integral part of this specification, a sheet of drawings is attached in whose unique figure, for illustrative and non-limiting purposes, the following has been represented:
  • Figure 1. It is a schematic view of the leak verification device and / or leak detection in tanks, in accordance with the invention, where a test cover (carrier of the necessary connections for the execution of the tests), is coupled to the manhole of a partially shown tank.
  • a test cover carrier of the necessary connections for the execution of the tests
  • test cover 1 is secured to the perimeter flap of the manhole 2, using the pressure clips 7.
  • the pressure sensor is referenced with the number 8 and is perfectly secured to the "placket" 6, where the instrumentation is connected, and inserted into the aluminum pipe 9 which is internally threaded at its lower end and with a closure of safety at the upper end.
  • Reference 10 designates the continuous power supply for supplying said pressure sensor 8.
  • the signal acquisition system is referenced with the number 11 and the laptop with the number 12.
  • connection 16 is necessary for the coupling of the air supply pump 15 with which the pressurization of the tank will be carried out.
  • Connection 17, reference the hose where a gauge or absolute pressure gauge is connected.

Abstract

The invention is for use with 'empty' and degassed' tanks for storing liquid oil products and chemicals. It comprises three parts: 1) Selecting the right tools and devices for carrying out this type of test, guaranteeing leak detection at a rate of 100 ml/h, and for sending the signals from the tools to a portable computer. 2) Implementing and using signal conditioning methods and methods of analysis in the time domain and frequency domain, on pressure signals acquired during the performance of this type of test. 3) Developing software, based on the conclusions drawn from the application of the above methods, to a variety of tests, which can work 'in real time' and automatically output a diagnosis indicating leaktightness or the presence of leaks.

Description

MÉTODO Y DISPOSITIVO DE VERIFICACIÓN DE ESTANQUEIDAD Y/O DETECCIÓN DE FUGAS EN TANQUES OBJETO DE LA INVENCIÓN METHOD AND DEVICE FOR VERIFICATION OF SEALING AND / OR DETECTION OF LEAKS IN TANKS OBJECT OF THE INVENTION
La presente invención, según lo expresa el enunciado de esta memoria descriptiva, se refiere a un método y dispositivo de verificación de estanqueidad y/o detección de fugas en tanques, en especial en instalaciones de almacenamiento de productos petrolíferos líquidos y productos químicos y surge para cumplir con las exigencias legislativas sobre los tanques de simple pared enterrados que pertenecen a éstas instalaciones, exigencias que obligan antes de poner en servicio éstos tanques, a la realización de pruebas, tras una limpieza e inspección y/o una reparación interior (según se indica en el informe UNE 53 991 IN) , y antes de su enterramiento definitivo (se denominan pruebas en el lugar de emplazamiento) .The present invention, as stated in the description of this specification, refers to a method and device for verifying tightness and / or detection of leaks in tanks, especially in storage facilities for liquid petroleum products and chemical products and arises for comply with the legislative requirements on buried single wall tanks that belong to these facilities, requirements that are mandatory before putting these tanks into service, to carry out tests, after cleaning and inspection and / or internal repair (as indicated in report UNE 53 991 IN), and before its definitive burial (tests are called at the site).
Mediante éste sistema (método y dispositivo) se consigue la verificación de estanqueidad y/o detección de fugas, cuando los tanques se encuentran "vacíos", es decir, sin producto líquido en su interior, y Mesgasificados" , sin presencia apreciable de producto en fase gaseosa en su interior. La invención consta de tres partes : 1) Selección de la instrumentación y dispositivos adecuados para la realización de pruebas en tanques vacíos y desgasificados, con la seguridad necesaria y con una garantía de detección de fugas del orden de 100 ml/h, (exigida en la actual legislación) , así como del equipamiento para la adquisición y envío de las señales de la citada instrumentación hasta un ordenador portátil.Through this system (method and device) the verification of tightness and / or leak detection is achieved, when the tanks are "empty", that is, without liquid product inside, and Mesgasified ", without appreciable presence of product in gas phase inside The invention consists of three parts: 1) Selection of the instrumentation and devices suitable for testing in empty and degassed tanks, with the necessary safety and with a leak detection guarantee of the order of 100 ml / h, (required by current legislation), as well as the equipment for the acquisition and sending of the signals of the said instrumentation to a laptop.
2) Implementación y utilización de técnicas sobre las señales de presión adquiridas durante la ejecución de pruebas de verificación de la estanqueidad y detección de fugas en tanques vacíos y desgasificados. Las técnicas referidas con anterioridad, son las de acondicionamiento de la señal, análisis en el dominio del tiempo y análisis en el dominio de la frecuencia.2) Implementation and use of techniques on pressure signals acquired during the execution of tests to check the tightness and leak detection in empty and degassed tanks. The techniques referred to above are those of signal conditioning, time domain analysis and frequency domain analysis.
3) Desarrollo de un software, basado en las conclusiones de la aplicación de las técnicas citadas en el párrafo anterior, sobre multitud de pruebas, capaz de trabajar "en tiempo real" y expedir de forma automática un diagnóstico de estanqueidad o presencia de fugas .3) Software development, based on the conclusions of the application of the techniques mentioned in the previous paragraph, on a multitude of tests, capable of working "in real time" and automatically issuing a diagnosis of leakage or presence of leaks.
ANTECEDENTES DE LA INVENCIÓN A fecha 18 de abril de 1.997, existían 285 métodos que poseen la homologación EPA/530/90 de la Agencia de Medio Ambiente de los Estados Unidos de América . Todos éstos métodos se evaluaron mediante pruebas con presencia de producto en fase líquida, es decir, demostraron su aptitud únicamente para la detección de fugas de producto. Y son:BACKGROUND OF THE INVENTION On April 18, 1997, there were 285 methods that have the EPA / 530/90 approval of the Environment Agency of the United States of America. All these methods were evaluated by tests with the presence of product in liquid phase, that is, they demonstrated their aptitude only for the detection of product leaks. And they are:
Métodos que miden las variaciones de un determinado parámetro a lo largo del tiempo, y según la evolución de dicha variación, son capaces de diagnosticar la presencia o no, de fugas.Methods that measure the variations of a certain parameter over time, and according to the evolution of said variation, are able to diagnose the presence or not of leaks.
Métodos que aprovechan los efectos causados por el paso del fluido a través del defecto que ocasiona la fuga de producto, y detectan las vibraciones o las variaciones de nivel que tienen lugar empleando micrófonos o sensores de ultrasonidos, cuyas lecturas se tratan informáticamente.Methods that take advantage of the effects caused by the passage of the fluid through the defect that causes the product to leak, and detect the vibrations or level variations that take place using microphones or ultrasonic sensors, whose readings are treated informatically.
En todos éstos métodos citados, la flabilidad del diagnóstico es muy deficiente, entre otras, en las siguientes circunstancias: niveles freáticos elevados, nivel bajo de llenado de producto en el tanque, variación importante de presión exterior o de la temperatura del producto durante la prueba, etc. En la actualidad, y para pruebas con producto líquido en el interior del tanque, además de los indicados anteriormente, existen algunos sistemas que se basan en la aplicación de sobrepresión o la ejecución de un vacío y a continuación la realización de un seguimiento mediante instrumentación de las variaciones de presión en la fase gaseosa del interior del tanque. Estos sistemas tienen las siguientes limitaciones y deficiencias :In all these methods mentioned, the diagnostic flammability is very poor, among others, in the following circumstances: high groundwater levels, low level of product filling in the tank, significant variation in external pressure or product temperature during the test, etc. At present, and for tests with liquid product inside the tank, in addition to those indicated above, there are some systems that are based on the application of overpressure or the execution of a vacuum and then the follow-up by means of instrumentation of the pressure variations in the gas phase inside the tank. These systems have the following limitations and deficiencies:
Los que utilizan la sobrepresión, tienen la característica de cuanto mayor es el volumen de la fase gaseosa del interior del tanque, más se debe alargar el tiempo de prueba, para que el sistema sea capaz de detectar una fuga. Dicho de otra forma, si el tanque presenta un % elevado de su volumen en fase gaseosa y el producto tiene un elevado grado de volatilidad (gasolinas) , el tiempo de estabilización de la fase gaseosa, que deberían esperar, para detectar una fuga del orden de 100 ml/h sería muy elevado. Además, necesitan un excesivo tiempo de reposo o espera, tras una descarga de producto para permitir la estabilización de la temperatura del citado producto. También es necesario realizar correcciones, debidas a variaciones de temperatura exterior e interior, presión atmosférica, posición del nivel freático, tipo de líquido o gas que atraviesa el posible defecto del tanque, etc.Those who use the overpressure, have the characteristic of the greater the volume of the gas phase inside the tank, the longer the test time must be extended, so that the system is able to detect a leak. In other words, if the tank has a high% of its volume in the gas phase and the product has a high degree of volatility (gasolines), the stabilization time of the gas phase, which should wait, to detect a leak of the order of 100 ml / h would be very high. In addition, they need excessive rest or waiting time, after a product discharge to allow the temperature stabilization of said product. It is also necessary to make corrections, due to variations in exterior and interior temperature, atmospheric pressure, position of the water table, type of liquid or gas that crosses the possible tank defect, etc.
Los métodos que funcionan provocando una depresión en los tanques, tienen las desventajas siguientes: a) Someten a unas fuerzas estructurales, a los tanques, que en condiciones normales no existen, b) Aumentan la probabilidad de que se produzca un taponamiento de la fuga en el exterior del tanque . c) Tienen limitada el nivel de depresión máximo al que pueden ser sometidos a 200 mb, por lo que existe una limitación en la altura de columna de producto líquido que puede existir en el tanque al inicio del proceso de ejecución de una prueba. En conclusión, no existe ningún método o sistema que sea capaz de emitir un diagnóstico totalmente fiable acerca de la estanqueidad de un tanque, si la prueba se realiza con producto en fase líquida en su interior, ya que, la diversidad de condiciones iniciales descritas, sobre las que se desarrollan éstas pruebas con producto líquido, influye de forma considerable en el diagnóstico.The methods that work causing a depression in the tanks, have the following disadvantages: a) Subject to structural forces, to the tanks, which in normal conditions do not exist, b) Increase the likelihood of a leakage plugging outside the tank. c) They have limited the level of maximum depression to which they can be subjected to 200 mb, so there is a limitation in the column height of liquid product that may exist in the tank at the beginning of the test execution process. In conclusion, there is no method or system that is capable of issuing a totally reliable diagnosis about the tightness of a tank, if the test is carried out with a liquid phase product inside, since the diversity of initial conditions described, on which these tests with liquid product are developed, it has a considerable influence on the diagnosis.
La invención que se presenta, es el primer sistema desarrollado y eficaz para ser aplicado en tanques vacíos y desgasificados, es decir, tanques que han sido limpiados y desgasificados, para, ser inspeccionados, o tanques que han sido reparados o instalados por primera vez. Así, antes de proceder a su llenado con productos potencialmente contaminantes, aplicando éste sistema podemos verificar la estanqueidad de la instalación y por tanto garantizar la protección del medioambiente . Además se implementa un "mantenimiento preventivo" , ya que se pueden detectar fugas de aire a través de defectos, orificios, grietas, etc, de la estructura del tanque, antes de que puedan llegar a provocar pérdidas de producto .The invention presented is the first system developed and effective to be applied in empty and degassed tanks, that is, tanks that have been cleaned and degassed, to be inspected, or tanks that have been repaired or installed for the first time. Thus, before filling it with potentially polluting products, applying this system we can verify the tightness of the installation and therefore guarantee the protection of the environment. In addition, a "preventive maintenance" is implemented, since air leaks can be detected through defects, holes, cracks, etc., of the tank structure, before they can cause product losses.
Por tanto, a diferencia de lo que ocurre con todos los sistemas existentes, en los cuales, lo que se detecta es la fuga de producto líquido contaminante y por tanto son, de acuerdo con la normativa europea UNE-EN 13160, intrínsecamente no seguros, éste, es el primer sistema itinerante o portable (es decir, que no se instala permanentemente) , que posee la diferencia cualitativa con el resto, de ser intrínsecamente seguro.Therefore, unlike what happens with all existing systems, in which, what is detected is the leakage of contaminating liquid product and therefore they are, in accordance with European regulations UNE-EN 13160, intrinsically unsafe, this is the first mobile or portable system (that is, it is not permanently installed), which has the qualitative difference with the rest, if it is intrinsically safe .
DESCRIPCIÓN DE LA INVENCIÓNDESCRIPTION OF THE INVENTION
En líneas generales, el método y dispositivo de verificación de estanqueidad y/o detección de fugas en tanques, objeto de la invención, permite realizar la prueba de estanqueidad, una vez efectuadas las conexiones pertinentes, sometiendo al tanque a un aumento de la presión interna, estando éste incremento limitado a un máximo de 0'75 bar, o inferior, si la normativa nacional y/o europea correspondiente, así lo indica. Con el tanque sometido a presión, el sistema, inicia un proceso de adquisición de las señales de presión captadas por un sensor que se halla en su interior, señales a las que aplica técnicas de acondicionamiento y técnicas de análisis (simultáneamente, en el dominio del tiempo y en el dominio de la frecuencia) , y cuando el análisis y seguimiento de los parámetros de la citadas señales de presión, determinan la condición de estanqueidad o de fuga, se emite automáticamente el diagnóstico de la prueba. Las técnicas utilizadas por el sistema son:In general, the method and device for checking the tightness and / or detection of leaks in tanks, object of the invention, allows to perform the tightness test, once the relevant connections have been made, subjecting the tank to an increase in internal pressure , this increase being limited to a maximum of 0.75 bar, or less, if the corresponding national and / or European regulations so indicate. With the tank under pressure, the system initiates a process of acquiring the pressure signals captured by a sensor inside it, signals to which it applies conditioning techniques and analysis techniques (simultaneously, in the domain of time and in the frequency domain), and when the analysis and monitoring of the parameters of the aforementioned pressure signals determine the leakage or leakage condition, the test diagnosis is automatically issued. The techniques used by the system are:
En el campo de acondicionamiento de señales; técnicas matriciales de descomposición en valores singulares, entre otras.In the field of signal conditioning; matrix techniques of decomposition into singular values, among others.
En el dominio del tiempo; técnicas estadísticas, tales como el seguimiento de parámetros de varianza, media, curtosis, neguentropía, etc.In the domain of time; statistical techniques, such as monitoring parameters of variance, mean, kurtosis, neguentropia, etc.
En el dominio de la frecuencia; técnicas avanzadas que permiten analizar y hacer un seguimiento de parámetros tales como la densidad espectral de potencia, parámetros auto-regresivos y otros. Con la implementación de todas las técnicas citadas, el sistema, además de emitir un diagnóstico acerca de la estanqueidad, puede determinar patrones característicos de defectos asociados a fugas de fluidos y parametrizar las características del tanque, es decir, aportar una "firma espectral" promediada a toda la etapa de análisis de estanqueidad y establecer un patrón a seguir para el mantenimiento preventivo y predictivo del tanque.In the frequency domain; advanced techniques that allow you to analyze and track parameters such as power spectral density, self-regressive parameters and others. With the implementation of all the techniques mentioned, the system, in addition to issuing a diagnosis about the tightness, can determine characteristic patterns of defects associated with fluid leaks and parameterize the characteristics of the tank, that is, provide an averaged "spectral signature" to the entire stage of tightness analysis and establish a pattern to follow for the preventive and predictive maintenance of the tank.
La capacidad de detección del sistema se basa en la aplicación de las citadas técnicas a varios centenares de pruebas realizadas en diversas condiciones a tanques entre 5 y 50 m3 de volumen.The detection capacity of the system is based on the application of the aforementioned techniques to several hundred tests carried out in various conditions to tanks between 5 and 50 m3 in volume.
Para visualizar los dispositivos de conexión de la invención y formando parte integrante de esta memoria descriptiva, se acompaña una hoja de planos en cuya figura única, con carácter ilustrativo y no limitativo se ha representado lo siguiente:To visualize the connection devices of the invention and forming an integral part of this specification, a sheet of drawings is attached in whose unique figure, for illustrative and non-limiting purposes, the following has been represented:
BREVE DESCRIPCIÓN DE LOS DIBUJOSBRIEF DESCRIPTION OF THE DRAWINGS
Figura 1.- Es una vista esquemática del dispositivo de verificación de estanqueidad y/o detección de fugas en tanques, acorde con la invención, donde una tapa de pruebas (portadora de las conexiones necesarias para la ejecución de las pruebas) , se encuentra acoplada a la boca de hombre de un tanque mostrado parcialmente .Figure 1.- It is a schematic view of the leak verification device and / or leak detection in tanks, in accordance with the invention, where a test cover (carrier of the necessary connections for the execution of the tests), is coupled to the manhole of a partially shown tank.
DESCRIPCIÓN DE LA FORMA DE REALIZACIÓN PREFERIDA Haciendo referencia a la numeración adoptada en las figuras, podemos ver cómo la invención se traduce en la práctica en un dispositivo que incluye una tapa de pruebas de aluminio 1, que se acopla a la solapa de la boca de hombre 2 del tanque 3, y que lleva acoplados dos "carretes" 4 de cierre rápido que se ajustan herméticamente a los orificios practicados sobre ella (la tapa) , ya que en ambos platos 5 de los carretes existen juntas tóricas de cierre hermético contra la tapa de pruebas y contra la "tapeta" 6, donde se conectan los diferentes sensores (presión, frecuencia, etc) , manómetro, válvula de seguridad, entrada para la presurización del tanque, fuga patrón, etc.DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to the numbering adopted in the figures, we can see how the invention is translated into practice in a device that includes an aluminum test cap 1, which is coupled to the flap of the mouth of man 2 from tank 3, and carrying two trailers Quick-closing "reels" 4 that fit tightly to the holes made on it (the cover), since in both plates 5 of the reels there are tightly sealed O-rings against the test cover and against the "placket" 6, where the different sensors are connected (pressure, frequency, etc.), pressure gauge, safety valve, tank pressurization input, standard leak, etc.
La tapa de pruebas 1 queda asegurada a la solapa perimetral de la boca de hombre 2, mediante las grapas de presión 7.The test cover 1 is secured to the perimeter flap of the manhole 2, using the pressure clips 7.
El sensor de presión está referenciado con el número 8 y queda perfectamente asegurado a la "tapeta" 6, donde se conecta la instrumentación, e introducido en el tubo- guia de aluminio 9 que está roscado interiormente en su extremo inferior y con un cierre de seguridad en el extremo superior. La referencia 10 designa la fuente de alimentación continua para alimentar el citado sensor de presión 8. El sistema de adquisición de señales está referenciado con el número 11 y el ordenador portátil con el número 12.The pressure sensor is referenced with the number 8 and is perfectly secured to the "placket" 6, where the instrumentation is connected, and inserted into the aluminum pipe 9 which is internally threaded at its lower end and with a closure of safety at the upper end. Reference 10 designates the continuous power supply for supplying said pressure sensor 8. The signal acquisition system is referenced with the number 11 and the laptop with the number 12.
Se ha referenciado con el número 13 la conexión para medir una fuga patrón, y con el 14 la válvula de seguridad que estará tarada a 0'5 bar. La conexión 16, es necesaria para el acoplamiento de la bomba de impulsión de aire 15 con la que se efectuará la presurización del tanque. La conexión 17, referencia el latiguillo donde se conecta un indicador de presión manométrica o absoluta. The connection for measuring a standard leak has been referenced with number 13, and with 14 the safety valve that will be set at 0.5 bar. The connection 16 is necessary for the coupling of the air supply pump 15 with which the pressurization of the tank will be carried out. Connection 17, reference the hose where a gauge or absolute pressure gauge is connected.

Claims

REIVINDICACIONES i CLAIMS i
1.- MÉTODO DE VERIFICACIÓN DE ESTANQUEIDAD Y/O DETECCIÓN DE FUGAS EN TANQUES, caracterizado porque incluye : a) Someter un tanque vacío y desgasificado a un aumento de la presión interna, limitada a una sobrepresión máxima de 0'75 bar, e iniciar una etapa de adquisición de señales de presión, seguimiento y análisis de parámetros de ésas señales, mediante técnicas de acondicionamiento de señal y técnicas estadísticas y de análisis, simultáneamente, en los dominios del tiempo y de la frecuencia, b) Finalizar la prueba cuando el análisis y seguimiento de los parámetros de las señales de presión adquiridas, con las técnicas citadas, determinan la condición de estanqueidad o fuga del tanque y se emite de forma automática el resultado, c) Calcular la firma espectral promediada a toda la etapa dé análisis de estanqueidad y establecer el patrón a seguir para el mantenimiento preventivo y predictivo del tanque.1.- METHOD OF VERIFICATION OF SEALING AND / OR DETECTION OF LEAKS IN TANKS, characterized in that it includes: a) Subject an empty and degassed tank to an increase in internal pressure, limited to a maximum overpressure of 0.75 bar, and start a stage of acquisition of pressure signals, monitoring and analysis of parameters of those signals, by means of signal conditioning techniques and statistical and analysis techniques, simultaneously, in the domains of time and frequency, b) Finalize the test when the analysis and monitoring of the parameters of the acquired pressure signals, with the aforementioned techniques, determine the condition of leakage or leakage of the tank and the result is automatically emitted, c) Calculate the spectral signature averaged throughout the analysis stage. tightness and establish the pattern to follow for preventive and predictive maintenance of the tank.
2.- DISPOSITIVO DE VERIFICACIÓN DE ESTANQUEIDAD Y/0 DETECCIÓN DE FUGAS EN TANQUES, caracterizado porque incluye una tapa (l),de pruebas con medios de cierre mediante mordazas de presión (7) respecto de la solapa de la boca de hombre (2) del tanque (3), habiéndose previsto que la tapa (1) lleve acoplados con interposición de juntas tóricas, dos carretes de cierre rápido (4) para acoplamiento de unas tapetas (6) , donde se conectarán los diferentes sensores (presión, frecuencia, etc) , manómetro, válvula de seguridad, boquilla de entrada para la presurización del tanque, fuga patrón, etc., incluyendo el sensor de presión (8) un tubo (9) de aluminio, roscado interiormente en su extremo inferior e interior al tanque (3) , con cierre de seguridad en su extremo superior, con conexión a la fuente de alimentación de corriente continua 10, para alimentar el transmisor de presión, conectándose a ésta fuente una tarjeta de adquisición de datos 11, que a su vez se conecta a un ordenador portátil (12) , con el software desarrollado para la evaluación de la estanqueidad y la detección de fugas en tanques vacíos. 2.- SEALING VERIFICATION DEVICE AND / 0 TANK LEAK DETECTION, characterized in that it includes a cover (l), of tests with closing means by means of pressure jaws (7) with respect to the flap of the manhole (2) ) of the tank (3), having provided that the cover (1) has two O-ring reels (4) for coupling of flaps (6), where the different sensors (pressure, frequency) will be connected , etc.), pressure gauge, safety valve, inlet nozzle for tank pressurization, pattern leak, etc., including the pressure sensor (8) an aluminum tube (9), threaded internally at its lower end and internal to the tank (3), with safety lock at its upper end, with connection to the source DC power supply 10, to power the pressure transmitter, connecting to this source a data acquisition card 11, which in turn connects to a laptop (12), with the software developed for the assessment of tightness and leak detection in empty tanks.
PCT/ES2007/000665 2007-11-20 2007-11-20 Method and device for checking leaktightness and/or detecting leaks in tanks WO2009065972A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2447547A1 (en) * 1979-01-26 1980-08-22 Le Sourne Yvette Detector for leakage in buried fuel tank - uses observation of pressure loss of gas injected under pressure to derive leakage rate
ES2088350A2 (en) * 1993-08-12 1996-08-01 Rafibra S L Procedure for checking leak-tightness in tanks.
US5668308A (en) * 1993-10-07 1997-09-16 Denby; Carl Leakage detection
US5767393A (en) * 1997-03-10 1998-06-16 Mcdermott Technology, Inc. Apparatus and method for detecting leaks in tanks
US20070068225A1 (en) * 2005-09-29 2007-03-29 Brown Gregory C Leak detector for process valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2447547A1 (en) * 1979-01-26 1980-08-22 Le Sourne Yvette Detector for leakage in buried fuel tank - uses observation of pressure loss of gas injected under pressure to derive leakage rate
ES2088350A2 (en) * 1993-08-12 1996-08-01 Rafibra S L Procedure for checking leak-tightness in tanks.
US5668308A (en) * 1993-10-07 1997-09-16 Denby; Carl Leakage detection
US5767393A (en) * 1997-03-10 1998-06-16 Mcdermott Technology, Inc. Apparatus and method for detecting leaks in tanks
US20070068225A1 (en) * 2005-09-29 2007-03-29 Brown Gregory C Leak detector for process valve

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