DD208220A1 - DEVICE FOR LEAKAGE TESTS ON LOW-PRESSURE GAS INSTALLATION PLANTS - Google Patents

Abstract

The device can be used for the implementation of the prescribed leakage tests newly built and the review of existing low-pressure gas installations. The device consists of the combination of a liquid manometer with a leak rate measuring device and allows the pre-examination, the Hauptpruefung, as well as an accurate determination of the leakage rate at constant Pruefdruck for urban and natural gas. The device is characterized in that., Vor, Haupt u. Nachpruefg. can be done with a tester. As a measuring means a remaining in the device remaining Sperrfluessigkeit is used. The amount of leakage occurring in the test period at the test section is immediately readable. The device is handy and low maintenance.

Description

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Title of the invention

Leak test device for low pressure gas installations

Field of application of the invention

The application is carried out for the leak test of newly constructed and verification of existing Niederdruokgasinstallationsanlagen for urban and natural gas.

Characteristic of the known technical solutions

In practice, there is often the need for preliminary, main and recheck of low pressure gas installations in an object. This requires different devices for leak detection.

It is known from practice and the literature no complex device which is designed so that both a pre-test than a main and recheck can be realized with it. While known devices of Druckmeßteohnik are used for the pre- and main test, the review of existing low-pressure gas installation systems is done with very different devices, the best known and their most essential. Nachtelle are listed below. Devices are known which after the printing

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Waste method work.

They have the following disadvantages:

- Suitability for verification only

- no constant test pressure

- Leakage determinable only with knowledge of the geometric volume of the test section

Other devices are based on the volumetric flask prinaip with the disadvantages:

- Suitability for verification only

- Complicated construction by mechanical parts

- Not suitable for sensitive measurements (piston friction)

Also, devices based on the principle of a tracked, defined Prüfgasmenge have the drawbacks

- Suitability for verification only

- Leakage determinable only for defined limit values

Object of the invention

Aim! The invention is a device which is designed so that both a pre-test and a main test and verification of low-pressure gas installation systems can be realized with it. It should be dispensed with the use of mechanically moving components

 The verification should be carried out at constant test pressure and allow a quantitative Leckmengenbe mood.

Explanation of the essence of the invention

The object of the invention is in a device

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to combine the required components to carry out preliminary, main and post-test tests and to allow a direct measurement of the leakage rate with a constant test pressure.

According to the invention the object is achieved in that by means of a barrier liquid in a system specially arranged and trained containers, connecting and measuring lines which are interconnected and can be shut off by valves, all required for a pre-, main and review test parameters adjustable and the test results are readable.

The device consists of a durohsihtigen measuring vessel which is connected via a protruding standpipe and a drain valve with a connection ramp,

The measuring vessel is connected via a connecting pipe with a connection valve and a check valve. The connecting valve is used via a hose connection for connecting the device to the test section and for checking the tightness of the device.

(Internal control)

By means of a suction connection and pressure generating means (e.g., pressure pump), the test gas (e.g., air or fuel gas) is admitted via the check valve.

The aforementioned components are connected by the connection ramp via a shut-off valve and a connecting pipe with a durohsichtigen level vessel in connection

 The level vessel is provided with a filling and breathing opening, which is closed during transport of the device by means of sealing plug. In addition, the connection ramp is over

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Shut-off valve with a transparent measuring tube, which can be separated from the atmosphere by means of a shut-off valve.

The device is filled to a mounted on the measuring tube O-mark with barrier liquid. The barrier liquid preferably consists of colored water, to which a suitable surface tension lowering inhibitor is added. A marking is applied to the through-level vessel, which serves to level the device. This marking corresponds to the fluid level in the level vessel which inevitably arises during the leakage rate measurement and forms the test pressure specified in the regulations for the upper edge of the standpipe.

The measuring vessel is provided with a scale for measuring the leakage quantity, at which the maximum permissible limit values for municipal and natural gas installations are particularly marked.

The necessary differentiation of the marking results from the unitary test druk for city and natural gas plants chosen for this device.

In addition, the markings for the test pressure and the permissible pressure drop during the preliminary test as well as the marking for the test druk of the main test are also located on the measuring tube.

Ausführungsbe! Game

For the purpose of verifying an existing Niederdruokinstallationsanlage first the check valve 8 and the filling and breathing opening 11 is opened and the shut-off valve 13 is closed. Danaoh the device via the open connection valve 6 is connected to the test section and means

one of the size of the test sections s adapted Ein- direction over the check valve 7 as long as test gas in the test section and in the device inserted until the Sperrag from the Nullag © in the connecting tube 5 deflecting barrier liquid level with open drain valve 3 and 8 open shut-off the bottom Measuring vessel 1 and thus the liquid level in the connecting pipe 9 has reached the mark 16 in the level vessel 10. "In this state, the drain valve 3 is closed again. In the presence of a Leok ~ place in the test section, the barrier liquid level rises in the standpipe 2 until it reaches its upper edge and thus has set the prescribed test pressure. At this moment, the actual measurement begins «After the predetermined test time (for example,« 1 minute), the Sperrflüssigkeltsmenge which has flowed via the standpipe 2 into the measuring vessel 1, which corresponds to the leakage quantity of the Prüfabsohnittes be read.

For the purpose of preliminary testing of a newly established low-pressure installation, the device is connected to the test section as in the case of the leakage quantity measurement and filled with test gas. The shut-off valves 8 and 15 are closed and the shut-off valve 13 and the drain valve 3 are opened. The filling of test gas is only completed _? when the barrier liquid level in the measuring tube 14 has reached the mark 18 and thus the prescribed test pressure (s "B, 0.1 MPa).

In contrast to the preliminary test, redrglTch is the main test of a newly installed low-pressure installation. the shut-off valve 15 to the atmosphere

open. In this case, the barrier liquid in the measuring tube 14 must reach the mark 19 and thus the prescreened test pressure (e.g., 5 kPa).

Claims (1)

2 3 4517 Pc.it entan sayings Apparatus for performing leak tests on low-pressure gas installations characterized in that a Leckmengenmeßeinrichtung with a pressure measuring device for pre-, main- and inspection are functionally combined. Device according to item 1, characterized in that a sealing medium which constantly remains in the device is used as the common filling agent. Device according to point 1 and 2, characterized in that the required for the preliminary test test pressure is indicated by a liquid column, acts on a compressed air column. Device according to item 1 and 2, characterized in that the design and arrangement of corresponding containers the prescribed for a recheck test pressure is directly readable as a difference in level of the barrier liquid. Device according to item 1, 2 and 4, characterized in that the leakage amount 'occurred in the test period at the test section is directly readable. Device according to item 1, 2, 4, and 5, characterized in that by a suitably sized level vessel for the test task a sufficiently constant . Test drueic granted. For this 1 string drawings