Why is the oxygen pipeline degreased?
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Why is degreasing necessary? The impurities that form during the manufacturing and installation of oxygen pipelines include weld slag, rust, grease, dirt, and other such substances. The presence of these impurities poses safety risks in production and causes various problems; for example, they can generate sparks that may lead to explosions, as well as damage the precision of measuring instruments and devices attached to the equipment and pipelines； Blockage process flow ； It affects the quality and output of the products, among other things. Therefore, after the piping is installed but before it is put into use, it is necessary to carry out proper degreasing and cleaning of the oxygen-using equipment and oxygen pipelines, in order to remove the oil, welding slag, and other mechanical impurities that have accumulated during manufacturing, transportation, storage, and installation. This ensures that the cleaned surfaces achieve the required level of cleanliness, thereby creating favorable conditions for the safe and efficient operation of the system. 2. Standards applied: Specifications for the construction and acceptance of degreasing projects HG20202-2000; Quality standards for chemical cleaning of industrial equipment HG/T2387-2008; Specifications for the construction and acceptance of industrial metal pipeline projects GB 50235—97. 3.3.2 Water-based degreasers: Acidic or alkaline water-based degreasers are widely used today. Since they are non-volatile, the wastewater generated can be easily treated, allowing for easy reuse in cleaning processes. 3.3 Other degreasing agents: steam, to be used only where steam is readily available. Oil-free quartz sand or steel wool, used only for rust removal and rough degreasing, requiring oil-free compressed air as well. 4. How to degrease 4.1 Wiping degreasing, for parts such as valves. 4.2 Immersion degreasing: A method used when cyclic degreasing is not suitable for parts or equipment, or as a preliminary degreasing step before installation. 4.3 Circulative degreasing yields the best results; it also allows for processes such as pickling and passivation to be carried out. Using organic solvent-based or water-based degreasing agents for cleaning can achieve excellent outcomes. 5. Other requirements: In addition to having an oil content that meets the specified standards, oxygen pipelines must also be free of rust and particles, and dry rather than moist (if a specific dew point is required, they must be dried to that level). If the client requires the pipes to be passivated, then both carbon steel and stainless steel pipes should be passivated. 6. Standards and testing methods: a. Inspection under ultraviolet light should show no purple-blue fluorescence ； b. Wipe with clean, dry white filter paper; there should be no oil stains on the paper (except for discoloration caused by metal oxidation). c. Blow with oil-free steam, collect the condensate, and place a piece of pure camphor there – the camphor will rotate continuously. d. Quantitative analysis of oil content: the oil content per square meter meets the specified standard ； Sichuan Xiangguang Cleaning Technology Co., Ltd
Are there any more environmentally friendly degreasers? Normally, propylene is used, but this substance is a highly regulated hazardous material that requires registration; it’s also troublesome to purchase
Oxygen is a strong oxidizing agent, and lipids are organic substances; static electricity or sparks that may occur during pipeline transportation can easily lead to explosions, so degreasing is necessary before installation.
You can try an alkaline degreaser~~ However, for small items, dichloroethane or dichloroethylene are generally used; carbon tetrachloride should not be used~~
Currently, trichloroethylene is used instead of carbon tetrachloride for factory maintenance, while propane is more commonly used for cleaning instrumentation.
It seems that each place uses a different cleaning agent. .
There are environmentally friendly cleaning and degreasing agents; the American Blue Gold degreasing agent is eco-friendly and non-toxic, and it is continuously used by companies such as Praxair, Air Products, CNOOC, and CIMC. The original solution is a concentrated form; it should be diluted with softened water or deionized water at a ratio of 1:20 to 1:25 before use. It can be reused, and the waste liquid resulting from cleaning can be discharged into the sewage system after minor treatment.