Air conditioning system leak detection knowledge question and answer ( A)

a, what kind of traditional leak detection methods are there?

basically has the following kinds:

1. Look - visual leak detection: when found oil system of a joint, here may be for the leak.

2。 See - - Soapy water leak detection: the system into 10 ~ 20 kg/cm2 pressure of nitrogen, to the system of each parts with soap and water, for funnelled bubbling.

3。 Look - nitrogen water inspection: the system into 10 ~ 20 kg/cm2 pressure of nitrogen, the system into the water, for funnelled bubbling.

4。 Look - halogen leak detection: use do not contain halogen material of liquefied petroleum gas (LPG). Light leak detection lamp, air tube on hand with halogen lamps, nozzle close to the system may leak, flame color to purple blue, it indicates that the here have a lot of leakage.

5。 Listen - electronic leak detection: with a probe into the various could move leaking location, when a leak detector leakage alarm, here is the leakage point.

6。 See - gas differential pressure leak detection method: using sensors inside and outside differential pressure will pressure differential amplification, expressed in the form of digital electrical signals or voice or leak detection results. Usually have a vacuum negative pressure leak detection, helium and nitrogen positive pressure leak detection.

2, conventional leak detection methods: what are the strengths and weaknesses?

1。 The big funnelled non-system sudden rupture, and the system leakage is the colored liquid medium visual leak detection can't leak positioning is usually very small. This method is not suitable for air conditioning systems such as gas leak detection system.

2。 Soap water leak detection, nitrogen exists obvious shortcoming, moisture into the system, system of material corrosion. Disintegration of the system must be segmented to detect when leak detection, remove repeatedly, clear water, etc. , the intensity of labor is big, high pressure gas may cause greater damage to the system, no doubt to system producers to increase more maintenance cost, user and maintenance unit costs rise.

3。 Halogen flame leak detection of obvious disadvantage: flame ignition surroundings often inevitable oil, cleaning agents, such as tinder, at the same time the flame with the refrigerant can produce poisonous gas, and vulnerable to environmental chemicals, oil and gas qualitative detection, accurate positioning funnelled not easily, only a few compounds containing halogen gas measurement and control system.

4。 Electronic leak detection products easy to damage, maintenance complex. Vulnerable to environmental chemicals such as gasoline, exhaust gas, the influence of various oil and gas, liquid, and so on, is a reflection of the vast majority of users 'light has leakage alarm signal to know! But funnelled don't know where! 'Qualitative' can't ', that is, only 'localization' shortcomings, can't completely solve system leak detection problem.

5。 Gas differential pressure leak detection method: both vacuum negative pressure leak detection, helium and nitrogen positive pressure leak detection method, can only know whether system leak 'qualitative' and cannot find funnelled accurate! At the same time, this method only production of online leak detection system.

three, summary and classification of conventional leak detection method

what has been discussed above, we are told, conventional leak detection method is divided into two categories:

1. Using the original gas medium in the system of certain chemical I convey leakage or not. Such as electronic leak detection, halogen leak detection. This kind of method of detecting equipment strong specificity. Close-up system can only use feature detection equipment, advantage is to 'qualitative', defect is not 'localization'!

2。 To the system to add some gas outside the original medium material, physical properties of the use of these substances pass leakage or not. Such as soap water leak detection, nitrogen, gas differential pressure leak detection. Advantage is that such method can 'positioning', the disadvantage is that testing equipment is expensive, Differential pressure gas leak detection) , or equipment is big, Nitrogen water detection, gas differential pressure leak detection) , or low labor intensity and can leak rate.

4, add to the detection system in any material must have what conditions?

air conditioning refrigeration system in the process of operation requirements in the long-standing material has the following characteristics:

high chemical stability, thermal stability.

good material compatibility.

does not affect system performance.

water (do not contain Moisture content is lower than 50 parts per million (PPM) 。

5, is there a combination of all traditional leak detection method is a new way of leak detection?

there are! Tracer method of leak detection. Is a preventive and planned leak detection methods, as well as positioning can be qualitatively.

6, tracer leak detection method is what?

is a kind of combined with the traditional advantages of the latest testing technology of leak detection method. Is to join in the system a kind of liquid material, permeable strong BON fluorescence and the integration of the original medium system itself, as the system medium loop or scroll to infiltrate the external reserves the leak point, with the corresponding external detection, leak detection lamp system leak inspire very bright color such as yellow, white and bright fluorescence, thus indicating system accurately funnelled!

7, tracer leak detection method includes several tools material?

1。 Tracer. 2. Leak detection light and fluorescence increase of glasses. 3. Filling tool.

eight, tracer material has impact on the system?

no! BON tracer is a kind of chemical properties are quite stable formula of liquid material, different system corresponding BON tracer not and the system of metal materials ( Iron, copper, aluminum, etc. ) Polymeric materials, rubber materials, or have any reaction liquid medium.

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