Study on the use of polymer ring under the use of gas compression equipment underwater

The temperature rises during operation, especially for mobile micro-high-speed high-pressure units, and the temperature of the friction pair is higher. The heat-dissipated fluoroplastic decomposition product then exits the compressor and enters a compressed gas source for the submersible operator's breathing/life support system 0. There is a potential threat of polymer-like smoke fever that occurs like flu. The divers are breathing in confined spaces, the harsh working environment and heavy diving operations, the consequences will be unimaginable. This may be one of the important reasons for the use of PTFE piston rings in gas compressors for foreign personnel.

It must be clarified that it is customary to think that even in the case of overheating, the fluoroplastics have less decomposition products, and the continuous operating temperature is generally up to 260 bC. The weight loss of the ring can be ignored. This means that the service life of the machine does not mean that the gas is in compliance with the gas. The personnel health and safety requirements also pointed out that there is no authoritative data on the working temperature and corresponding weight loss of the domestic PTFE piston ring, and there is no detailed report on the toxicity of tetrafluorochemical decomposition products. To this end, when designing a gas compressor for personnel breathing, it may be necessary to refer to foreign similar working conditions for preliminary identification.

Because most of them are fixed large-scale, water-cooled, low-pressure, low-speed compressors, the operating temperature of the ring is relatively low, generally 205230bC, overheating 370bC, that is, less thermal decomposition products. At the same time, the compression level is small, resulting in a small total amount of piston rings, and a large amount of exhaust gas. As a result, the gas volume is significantly larger than the recommended value for diluting the thermal decomposition product to a safe concentration, so the gas supply is considered safe.

It should be pointed out that even if food is contaminated by thermal decomposition products of fluoroplastics, most people do not enjoy it when working in confined spaces. The toxicity of gastrointestinal tract is different from that of respiratory system, so it cannot be supported by diving/life support. The compressed gas source of system 0 is equivalent.

It can be seen that for gas compressors for diving breathing, such as the use of PTFE piston rings, the gas quality test should first determine the content of thermal decomposition products of fluoroplastics. Because it is not easy to detect the content of fluoroplastic decomposition products in compressed gas at present, the expedient is the measured operating temperature of the ring. Based on the relevant data, the corresponding weight loss and the gas flow rate required to dilute the pyrolysis product gas to a safe concentration are obtained, and a preliminary calculation of the safety of the safety is performed.

Firstly, it is recommended that the relevant departments study the amount of pyrolysis products corresponding to the working temperature of the PTFE ring, and give a quantitative analysis of the degree of toxicity of the human body, and establish authoritative standards to be bound to avoid the occurrence of malignant events that endanger the health of personnel.

Secondly, the oil content of the compressed gas for diving breathing should be measured by ultraviolet spectrophotometry according to GBn256/diving breathing gas 0.

In summary, a gas compressor that uses a PTFE piston ring to achieve oil-free lubrication of the cylinder, such as a diving breathing machine, should first verify the health and safety of the gas transmission quality.

Conclusion Modern diving technology plays an important role in marine development projects. In terms of current use, whether it is a light diving equipment using a piggyback cylinder or a special type of diving compression tank such as a diving bell, all kinds of diving operations performed by the diver are performed, depending on the /Life Support System 0 A source of compressed gas for the diver to breathe. Therefore, the selection of models for personnel breathing should establish a people-oriented design idea, first consider health safety.

At present, there are many ways to prepare clean and oil-free compressed gas, which can be fully demonstrated according to the requirements of use to determine the best solution. If a gas compressor with a filled PTFE piston ring is used, it is important to pay attention to the incubation period of certain dissipative components to the human body. The safety inspection safety report must be issued by the supervisory department.

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