Anhui Star Control Instrument Co., Ltd.

Anhui Star Control Instrument Co., Ltd.

Pressure gauge leakage hazards and inspection methods

If a leak occurs in the pressure gauge, measurement errors will occur in the light; when the pressure gauge is leaking, the use function will be lost; in severe cases, the pressure gauge will explode and safety problems will occur. The pressure gauge company should have a correct, applicable and feasible method to check the possible leakage of the pressure gauge so as to ensure that the factory pressure gauge does not leak.
  If a leak occurs in the pressure gauge, the pressure gauge will not be able to correctly indicate the pressure value when there is a slight leak, resulting in a measurement error. When the leak is obvious, the pressure gauge will not be able to measure the pressure and the pressure gauge will lose its function; if a pressure gauge leaks, it will Causes the working medium of the pressure gauge to flow out, which has an adverse effect on the production process; if it is serious, it will cause the pressure gauge to explode, causing injury to personnel. Therefore, in addition to ensuring that the pressure gauge does not leak from the design, production, and process, there should be a feasible method to check the possible leakage of the pressure gauge to ensure that there is no leakage from the factory pressure gauge. In addition, if the pressure gauge leaks during inspection or use, a feasible pressure gauge inspection method should be used to find out the leakage point, analyze the causes of the pressure gauge leakage, and further propose improvement measures.
  The following describes several leak detection methods.
  1. pressure gauge ball valve static pressure leak detection method
  In the pressure gauge industry, ball valve static pressure leak detection method is one of the simplest and most commonly used pressure gauge leak detection methods. In some industries, it is also called "pressure gauge pressure attenuation leak detection method."
  The operation of the pressure gauge leak detection method is to install the pressure gauge on the pressure checker, pressurize the pressure gauge to the upper limit of measurement, align the pressure gauge pointer with the upper scale line, and then close the ball valve, which is specified in the static pressure. After the time (3min, 5min, 15min, 30min, etc.), observe whether the pressure gauge pointer deviates from the upper scale line (also known as return). At this point, if the pressure gauge hands back, it indicates that there is a leak in the pressure gauge. pressure gauge ball valve static pressure leak detection method can only determine whether the pressure gauge leakage, but can not determine the leak point of the pressure gauge.
  2. pressure gauge leak detection method
  pressure gauge bubble leak detection method is generally used to determine the leakage point after determining the pressure gauge leaks. pressure gauge bubble leak detection method generally has 3 methods.
  The first is "Pressure Meter Leak Detection Method"
  This is the simplest and most convenient way to determine the leak. The operation of the pressure gauge leak detection method is to remove the pressure gauge housing, watch glass, dial and case, pressurize the pressure gauge (air pressure), and then use a writing brush soaked in soapy water to leak. The parts, such as pressure gauge spring tube root welding, pressure gauge sealing plate welding, etc., if a welding place has a bubble, this point is the leak. Although this method is simple and convenient, if the pressure gauge is a tiny leak, it is very likely that there is no leak point on the gauge.
  The second is "pressure leak detection method of gas leak detector"
  Leak test reagents are non-toxic, odorless, non-corrosive liquids that are enclosed in plastic or metal sealed bottles (cans). When the pressure gauge is pressurized (atmospheric pressure), the leak detector is sprayed on the pressure gauge where the leakage may occur, such as the pressure gauge spring tube root welding, the pressure gauge sealing plate welding, etc. If there is a bubble generated somewhere, then The point is the leak. The use of pressure gauge leak detection tester for leak detection has the advantage that extremely small leaks can also be detected. At this time, the pressure gauge leakage point will appear as if it were a crab spitting. It takes only one or two times for a long time. Tiny bubbles.
  The third is "pressure gauge sinking into the water leak detection method"
  pressure gauge sinks into the water. The leak detection method is to sink the pressure gauge into the clear water. Put the sealed case into a proper amount of fresh water, and then pressurize (pressure) the pressure gauge. Observe the pressure gauge carefully. There is an air bubble, and the point where the air bubble appears is the leak point of the pressure gauge.
  3. pressure gauge helium mass spectrometer leak detector
  The pressure gauge helium mass spectrometer leak detector is an airtight inspection instrument made of helium as an exploration gas based on the principle of mass spectrometry. pressure gauge helium mass spectrometry leak detection method has high detection sensitivity, high speed and wide application range. In particular, non-toxic, five-destructive, light-weight inert gas helium is used as an exploration gas, and has become a leader in many pressure gauge leak detection methods today. .
  The use of pressure gauge/mass spectrometer leak detection basically has four leak detection methods depending on the purpose of leak detection.
  The first is to determine the position of the leaking hole of the inspected part of the pressure gauge by "injection method" and "inhalation method";
  Second, in order to determine the leakage rate of pressure-tested parts, “bell-bell method” and “back-pressure method” can be adopted.
  The pressure gauge injection method is used for leak detection. The method is to install the tested pressure gauge on the leak detection port of the leak detector. Use the instrument's vacuum system to vacuum the pressure gauge and reach the vacuum connection to communicate with the mass spectrometer. Then use the spray gun to The oil filling hole of the pressure gauge is blown with helium into the shell. If there is a leak in the pressure gauge, helium will be detected through the leak hole into the mass spectrometer.
  4. pressure gauge halogen leak detector leak detection method
  The working principle of the pressure gauge halogen leak detector is when the air contains different concentrations of sulfur hexafluoride or other halogen gases (such as fluorine, chlorine, bromine, etc.), the degree of ionization of the mixed gas under the action of high-frequency electromagnetic fields. It will also be different, and the displayed gas level can be read on the LCD screen. Pressure Leak Detector Halogen Leak Detector has the advantages of high sensitivity, good stability, fast response, no poisoning of the probe, no toxic gas, etc. pressure gauge halogen leak detector has two methods of qualitative detection and quantitative leak detection.
  The pressure gauge halogen leak detector leaks the leaked pressure gauge. The method is to pressurize the pressure gauge to the rated working pressure (0.6MPa), and then seal the pressure gauge with a double plastic bag. After 24 hours, Insert the tip (needle valve) into the plastic bag and read the displayed gas concentration on the LCD screen to see if it is within the specified value.
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