How to produce high-quality beer equipment-Welding quality inspection method: leak tightness inspection So how to check the leak tightness of beer equipment tanks, process pipes, steam pipes, air pipes, etc.?
How to produce high-quality beer equipment-Welding quality inspection method: leak tightness inspection
So how to check the leak tightness of beer equipment tanks, process pipes, steam pipes, air pipes, etc.?
In general, the following methods can be used for testing according to the characteristics of different tanks and pipelines:
1. Submersible test
Used for small vessels or pipes subject to small internal pressure. Before the inspection, fill the container or pipeline with compressed air at a certain pressure (0.4-0.5MPa), and then submerge it to test the tightness, such as leakage; there must be bubbles in the water. This is also a common segment for checking whether the inner tube of a bicycle is leaking.
2. Water test
The static pressure generated by the water's own weight is used to inspect the structure for leakage. Based on visual inspection, it is suitable for general welded structures that are not under pressure but require tightness.
3. Ammonia leakage test
The purpose is the same as the coal pumping leakage test, and its sensitivity is higher than that of the kerosene leakage test. Before the test, paste a white paper strip or bandage impregnated with 5% HgNO3, aqueous solution or phenolphthalein reagent on the side of the weld for easy observation, and then fill the container with ammonia or add 1% nitrogen for compression Air. If there is a leak, it will be spotted on a strip of white paper or bandage. Dark spots were dipped in 5% HgNO3 aqueous solution, and erythema dipped in phenolphthalein reagent.
4. Kerosene leakage test
Used for welding structures that are subject to relatively small internal pressure and require a certain degree of sealing. Kerosene has strong permeability and is very suitable for the sealing test of welds. Before inspection, brush lime water on one side of the weld for observation. After drying, brush kerosene on the other side of the weld. If there are penetrating defects, kerosene spots or kerosene bands will appear on the lime layer. The observation time is 15-30min.
5. Helium mass spectrometry test
Helium mass spectrometry test is currently the most effective method for leak testing. The sensitivity of helium mass spectrometer is extremely high and can detect helium with a volume fraction of 10-6. Before the test, fill the vessel with helium, and then check for leaks on the outside of the vessel’s weld. The disadvantage is that helium is expensive and the inspection cycle is long. Although helium has a very strong penetrating power, it takes a long time to penetrate very small gaps (such gaps cannot be detected by other means), and the leak detection of some thick-walled vessels often lasts for tens of hours. Appropriate heating can speed up the leak detection speed.
6. Air tightness test
Airtightness test is a routine inspection method for boilers, pressure vessels and other important welded structures that require airtightness. The medium is clean air, and the test pressure is generally equal to the design pressure. The pressure should be increased step by step during the test. After reaching the design pressure, apply soapy water to the outside of the weld or sealing surface and check whether the soapy water is bubbling or not. Because the air tightness test has the risk of explosion, it should be carried out after the water pressure test is qualified.
In the brewery beer equipment inspection, the air tightness test is different from the air pressure test
1. Their purposes are different
The air tightness test is to check the tightness of the pressure vessel, and the air pressure test is to check the pressure resistance of the pressure vessel. Secondly, the test pressure is different. The air tightness test pressure is the design pressure of the vessel, and the air pressure test pressure is 1.15 times the design pressure. The air pressure test is mainly to check the strength and tightness of the equipment, and the air tightness test is mainly to check the tightness of the equipment, especially the small penetrating defects; the air tightness test focuses more on whether the equipment has small leakage, and the air pressure test focuses on For the overall strength of the equipment.
2. Use medium are different
Air is generally used in the actual operation of the air pressure test. In addition to air for the air tightness test, if the medium is highly toxic, no leakage or easy penetration is allowed, and ammonia, halogen or helium is used.
3. Safety accessories are different
During the air pressure test, there is no need to install safety accessories on the equipment; the air tightness test can only be carried out after the safety accessories have been installed under normal circumstances (Capacity regulations).
4. Sequence are different
The air tightness test needs to be carried out after the air pressure or water pressure test is completed
5. Test pressure are different
The air pressure test pressure is 1.15 times the design pressure, and the internal pressure equipment needs to be multiplied by the temperature trimming factor; when the air tightness test medium is air, the test pressure is the design pressure. If other media are used, it should be adjusted according to the medium.
6. Use occasions are different
Pneumatic test: The hydraulic test is preferred. If the hydraulic test cannot be used due to the equipment structure or support, or the equipment volume is large, the pneumatic test is generally used. Air tightness test: The medium is a highly or extremely hazardous medium, or leakage is not allowed.
Pneumatic test is a pressure test, in order to check the pressure strength of the equipment. The air tightness test belongs to the tightness test, in order to test the sealing performance of the equipment.
Check Tiantai Beer Equipment Co. when you start to set up your brewery, you will get more The stainless steel brewery tanks and pipes of brewery beer equipment produced by Tiantai Company have passed strict sealing and pressure tests. Each inspection process strictly records data to ensure that all brewery tanks and pipelines meet the design requirements and use standards. If you have plans to set up a brewery, we hope that Tiantai can become your brewery beer equipment supplier. Tiantai has provided high-quality brewery equipment to more than 1,800 breweries in 94 countries around the world, and has won praise from brewery investors and brewers.
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