Issues related to the matching of pipes and corresponding valve flanges
Thread Content
I would like to ask fellow sea professionals: how are pipes, valves, and flanges matched together? Are there any relevant standards? Can the materials used be different? What material is generally used for handling methanol condensate?
For methanol media, stainless steel is generally used; 304 grade is usually sufficient. It also depends on any other requirements. In the sites I’ve been to, for applications involving methanol, pipes, valves, and flanges made of 304 or 316 grade material are used. As for the type of valve to be used, it depends on the process requirements.
Firstly, valves, fittings, and the like are all designed to serve pipelines. It is necessary to determine the series of the pipeline first; then the fittings should match that of the pipeline, and the same applies to valves. As for exactly what should be used in each location, it depends on the requirements. In China, most valve flanges follow the JB standard. The key point is to confirm the series of the pipeline – series I and II have different outer diameters. It is possible to connect pipes made of different materials in cases where such a requirement exists; for example, it is feasible to convert from stainless steel to carbon steel, or from carbon steel to stainless steel or alloy steel
How are pipes, valves, and flanges matched together? Answer: (1) Select pipes, valves, and flanges with the same outer diameter for the connections; (2) choose pipes, valves, and flanges from the same series in terms of wall thickness; (3) use pipes, valves, and flanges made of the same material. Are there any relevant standards? Can the materials be different? What material is generally used for methanol condensate pipelines? Answer: There are corresponding specifications for each of them, as well as appropriate material standards. For systems using methanol condensate, ordinary carbon steel is sufficient. Refer to the book \"Examples of National Pressure Pipeline Design\" written by Zhang Dejiang and Song Keko