Can helium mass spectrometer leak detector be used for leak detection of fire equipment?

Regarding the application of helium mass spectrometer leak detector in fire equipment leak detection, the editor will give you a detailed explanation.

1、 Why do fire equipment cylinders need helium testing?

A fire extinguisher is a special equipment used in a fire, so it is generally idle. However, the bottle containing the fire extinguishing material has a pressure of 2.5 MPa. If the bottle leaks (due to the welding seam or valve of the bottle itself), especially small leaks, there will be great hidden dangers. Therefore, before leaving the factory, strict leakage detection processes should be carried out to avoid potential leakage hazards during transportation or storage.

2、 Leak detection method for fire equipment steel cylinders

At present, many domestic manufacturers of steel cylinders use the water inspection method, which involves applying a certain pressure of about 2 MPa to the fire steel cylinder, and then placing the entire cylinder into a water tank to check for bubbles. However, this method can only detect situations with relatively large leakage holes. According to calculations, the leakage rate is about 1.0 x 10-4 mbar I/s with a bubble diameter of 02.26mm and one bubble emerging per minute, making it difficult to detect small leaks.

With the increase of China’s export volume and the improvement of customers’ safety awareness, higher requirements are needed for leak detection of fire steel cylinders. Therefore, manufacturers now introduce helium mass spectrometer leak detectors for leak detection; The helium mass spectrometer leak detector is widely used in steel cylinder manufacturers, operating in positive pressure mode. The working principle is as follows: helium gas is injected into the inspected workpiece at a pressure of only 1.2 atmospheres – the suction gun is used to find the leak point on the workpiece. Normally, in positive pressure mode, the leak detector alarm value is set at 1.5 x 10-5 mbar I/s ， In the actual leakage detection process, if the leakage rate of the inspected workpiece is greater than this value, a leakage point alarm will be formed. If it is less than this value, it is considered that the sealing requirements of the steel cylinder are qualified.

3、 Explanation of Leak Detection Form

Use helium mass spectrometer leak detector

The suction gun mode detection of fire steel cylinders is the latest and most widely used detection method in the industry. A certain amount of helium gas is injected into the fire steel cylinder to create a pressure difference between the inside and outside of the cylinder. If there is a leak, the gas will leak from the inside of the cylinder. A helium mass spectrometer leak detector is used to slowly move the suction gun at the welding joint and valve of the cylinder. If the suction gun sucks helium gas, it will generate an alarm, and the workpiece will be confirmed to have a leak, thus achieving the measurement effect.

4、 Application of Fire Equipment Leak Detection

Helium mass spectrometer leak detectors are widely used in modern industrial production, representing advanced technological levels and the increasing demand for product quality. For example, the leak detection of fire-fighting equipment was first carried out in China using the immersion method. If no bubbles emerge from the fire extinguisher placed in water, it is considered qualified. This method relies entirely on human observation, and when encountering small leaks, it is impossible to detect them, which may lead to problems in future use and even endanger life. The use of helium mass spectrometer leak detectors greatly reduces the risk of leaks, and even small leaks can be detected, accelerating production efficiency.

The testing method uses the positive pressure method of helium mass spectrometer leak detector. First, helium gas is injected into the fire extinguisher, and then it is placed in a closed chamber. The chamber is connected to the helium mass spectrometer leak detector. When working, the chamber is first evacuated to a certain degree of vacuum before starting leak detection. The leakage rate is tested at 10-5 mbar I/s， The following is considered qualified (actual testing revealed a leakage of 2 ml within 24 hours, approximately 10-5 mbar. l/s).

The helium mass spectrometer leak detector can be applied to leak detection of fire equipment, hoping to be helpful to everyone.

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