Some questions regarding oxygen pipeline installation
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Hello, seniors! Currently, oxygen pipeline installation is required for work purposes, and the following questions have arisen upon consulting relevant specifications: 1. The \"Design Code for Oxygen Stations\" specifies that the elbows and branch connections of oxygen pipelines must not be installed directly on the outlet side of valves; instead, there should be a straight pipe section with a length of at least 5 times the nominal diameter of the pipeline, and this length should not be less than 1.5 meters. Is this requirement applicable to the shut-off valve downstream of the control valve and the bypass tee? Otherwise, the distance between the downstream shut-off valve and the bypass tee is 1.5 m, making it difficult to arrange the piping properly. However, according to GB16912, the valve assembly is considered as a single component, and it is required that there be a straight pipe section of 1.5 meters behind the valve assembly. 2. For mass flow meters, is this considered a throttling element? There was originally no requirement for straight pipe sections. Does this also require a 1.5m straight pipe section? 3. Regarding fittings, can welded fittings be used? 4. For connecting a smaller pipe to a larger one, when no suitable fittings are available, is it permissible to make holes and weld instead? 5. Is a 1.5m length also required for the straight pipe section behind the large and small ends? It doesn’t seem to be clearly stated. I would appreciate it if those with relevant work experience could reply when they have time. Thank you!
This post was last edited by CHANGBAISHI on 2020-7-5 at 16:24. Everything is carried out in accordance with the requirements of the \"Design Code for Oxygen Stations\". 1. It has been clarified. 2. For flow meters, they need to be designed in accordance with their usage requirements. 3. It shall be subject to the allowable pressure, but it is necessary to ensure that the type of pipeline, its material, and the manufacturing process all meet the physical and chemical requirements of oxygen. Parameters such as pipe diameter, material, and oxygen flow rate are all strictly specified. It is clearly specified in the \"Design Code for Oxygen Stations\". 4. Regarding the issue of openings, as long as they meet the relevant design requirements, that is sufficient. It is important to ensure that the inside of the pipes is clean, free of weld slag and grease, in order to prevent the generation of static electricity sparks due to impacts, or accidents such as explosions caused by contact with oil. 5. The distance on the side with the smaller tube diameter should be this much. To accommodate the special functions of control valves, all of this has been designed to meet the requirements of oxygen as a special medium. The \"Design Code for Oxygen Stations\" should be thoroughly studied, and the regulations therein must be followed. Remember not to create trouble for yourself; for reference only.
Note that it is optional to include a 1.5m straight pipe section; for new installations, it is recommended to include one
Seeking advice: In the case of liquid oxygen pipelines, is there a requirement for a 1.5-meter straight pipe section after the shut-off valve and before connecting to the elbow?
This post was last edited by CHANGBAISHI on 2022-9-16 06:09