Oxygen pipelines are required to meet oxygen purity standards; what are the requirements for oxygen purging gas?

The cleaning of oxygen pipelines is an important aspect in ensuring the safe operation of the system. For gases used in oxygen purging or displacement, the main standards and requirements include: 1. **Purity requirements**: The gases used (such as nitrogen or helium) are typically required to have a very high purity, generally exceeding 99.999%, in order to avoid the introduction of any impurities that could cause reactions. 2. **Oil-free and dust-free**: The gas should not contain oils, dust, or other impurities. These impurities can all become potential sources of fire and explosion. 3. **Drying**: The gas should be dry, with moisture content kept at an extremely low level to prevent corrosion of pipelines and equipment. Specific national and local standards, such as China’s standard GB/T 8979-2008 \"Safety Regulations for the Transportation, Storage, and Use of Industrial Oxygen,\" provide detailed specifications and requirements. These cover various safety measures related to the use of oxygen systems, including the quality requirements for the gas. Industry standards, such as those in the petrochemical industry or specific equipment manufacturing sectors, may also have more specific standards or recommended practices. It is recommended to refer to relevant ** or the latest industry standards in practical operations for design and maintenance, in order to ensure safety and compliance with regulatory requirements. If a specific standard text is required, you can visit the official standard issuing authority to obtain or purchase the relevant standard documents. .

The material requirements for pipelines, pipes, fittings, and valves must meet the specifications for oxygen flow rates, in accordance with relevant standards. The pipeline must undergo degreasing inspection before installation, with signature confirmation. Tungsten inert gas welding is used for root pass during installation to reduce the formation of mechanical impurities. Pipe cleaning methods include pickling and sandblasting for rust removal. Fittings, valves, instrument system sampling tubes, and instrument valves – all those in contact with oxygen must be degreased. After installation, gas purging should be used to remove mechanical impurities. It is essential to ensure these two tasks: degreasing and removing impurities (rust removal for carbon steel pipes). When put into use, if there are no other substances that can react chemically with oxygen, oxygen is used directly for displacement until the oxygen content at the end meets the required standard. Oil-free and free of mechanical impurities must be strictly checked to avoid serious accidents; remember this! ! ! For reference. For reference.

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