DD281859A5 - METHOD FOR LOCALIZING LEAKAGE POINTS FOR HOLLOW-FORMED COMPONENTS - Google Patents

Abstract

The invention relates to a method for the localization of leaks in hollow components, which did not pass the leak test with the test medium air, or for quality testing new or unverprueften components. The location of the fault locations is carried out with indicator gases (preferably CO2), or with additionally compressed exhaust gases of an internal combustion engine, wherein the exit of the indicator gases is detected with one or more detectors {hollow-shaped components; Tube; Leak detection; Exam}

Description

For this 1 page drawing

Field of application of the invention

The invention serves for the localization of leaks, or for the quality control of hollow components of the construction and melioration system.

Characteristic of the known state of the art

Known is the leak test with water. However, the following disadvantages arise for mobile or stationary tests.

- necessity of water supply,

- high expenditure of time in the test as a result of the filling and pre-filling time,

Risk of destruction of the trench profile in the event of sudden leaks,

- climatic factors, especially during construction site inspections.

Leakage tests are also known with air, where leaks by applying foam-forming solutions

be detected. Especially with large diameters here a high manual effort is necessary.

According to DE 3211452 A1 it is proposed to add to the compressed air a wettable medium or to the water a dye,

in order to locate visually visible leaks.

Disadvantage of this method are the necessary provision or generation of the test medium, but especially the The fact that a sufficient atomization of the test medium is hardly possible with larger test lengths. When locating with flue gases proposed according to DE 2810114, there is a risk of closure in the case of small leaks

with soot particles.

Also known are u.a. according to DE 2908351 and DE 3124268, the visual control with a channel camera. Object of the invention

Dts aim of the invention is, by means of simple device technology and a construction site and u. Ä. Tests quickly, adequately and weather-independent test medium leak locations to locate. At the same time, the method should allow time-consuming and cost-effective quality controls during pipe production in stationary operation.

Explanation of the essence of the invention The invention is based on the object, a time-consuming and cost-effective and weather-independent; Procedure for To develop localization of leaks in hollow components, the disadvantages of known solutions as far as possible

fixes.

The object is achieved with the method according to the invention in that as a test medium for the localization of leaks Indicator gases, preferably carbon dioxides or exhaust gases from internal combustion engines are used.

In this case, the indicator gas is introduced in a suitable manner into a test chamber sealed with shut-off bodies until a certain overpressure is reached and the leaks are located with one or more detectors. In the test with carbon dioxide, the necessary Überdn ck can be generated by the existing or reduced pressure in a pressure vessel or by additionally pressed air. When using exhaust gases of internal combustion engines, the necessary excess pressure is preferably generated by additionally pressed air.

This method allows quality testing in the production of hollow components as well as a weather-independent use on construction sites or leak location of laid pipelines.

embodiment The invention will be explained in more detail below on an exemplary embodiment, the accompanying drawing shows in Fig. 1: Schematically a section through a concrete pipe with equipment for leak detection.

The portion of a pipeline or pipe 1 to be tested is closed / sealed from inside by shut-off bodies 2 or other suitable means (eg blind flange) .The indicator gas, preferably carbon dioxide, is then suitably passed through the reducing means 3, which is coupled to a vacuum flow pressure display 4, is introduced into a pressure hose 5 into the test chamber 6. The pressure control is carried out with the manometer 7. After reaching the required pressure and the gas concentration necessary for localization in the test chamber 6, the reducing device 3 closes indicative pressure drop signals leaks that are located by one or more detectors.

For localization, especially smaller leaks, we recommend an immediate control of possible leaks and their localization by means of a detector immediately after closing of the reducing device 3. The detector can be operated with or without suction bell.

As a variant, exhaust gases from internal combustion engines can also be introduced into the test chamber via a specially designed adapter in the manner described. The compression and necessary pressure generation preferably takes place in a suitable manner with air.

Claims (3)

1. A method for the localization of leaks in hollow-shaped components, characterized in that in the sealed by shut-off (2) test chamber (6) via a reducing device (3) with vacuum flow pressure indicator (4) in a pressure hose (5) indicator gases, preferably carbon dioxide (CO2), initiated until reaching a certain overpressure, then after closing the reducing device (3) by comparing the scale values of the volume flow pressure gauge (4) with the pressure gauge (7) the tightness of the hollow component detected and occurring differences between the two or immediately after closing the reducer (3), the leaks are located with a detector. 2. A method for locating leaks in hollow-shaped components according to claim 1, characterized in that preferably on construction sites and other non-stationary areas as indicator gas and exhaust gases vcn internal combustion engines, fed through a special adapter to the sealed test room and their distribution and pressure generation in the test room preferably with Air is used, can be used. 3. A method for locating! .Eckstellen in hollow-shaped components according to claim 1 and 2, characterized in that preferably for use under stationary conditions in a suitable manner both displays coupled and / or multiple detectors are used for leak detection.