Natural gas pipeline flange selection
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According to the specification, there is a flammable and toxic medium pipeline, and the flange is a convex neck flange. Is it suitable for natural gas pipelines? Also, does the choice of neck flange have anything to do with pressure?
Raised neck flanges are generally suitable for some pipeline systems with high medium temperatures and high pressures. They are mainly used to prevent pipeline leakage and improve sealing performance. For natural gas pipelines, it is appropriate to choose a raised neck flange. Since natural gas is a flammable and toxic medium, the use of convex neck flanges can provide better sealing performance and prevent natural gas leakage. Whether the choice of neck flange is related to pressure, the answer is yes. When selecting flanges, the operating pressure of the piping system needs to be considered. For high-pressure natural gas pipelines, flanges with better pressure resistance are usually selected to ensure the safe operation of the pipeline system. Therefore, when selecting a specific type of neck flange, it is necessary to select the appropriate flange material and specifications according to the working pressure of the natural gas pipeline. .
It's best to write down the specifications, otherwise I won't know where the problem is if I have any questions, such as the convex neck flange you mentioned. Does this refer to the concave and convex neck flange? Pipes with higher pressures require the use of neck flanges.
Partially, but not completely, applicable to natural gas pipelines. We also need to look at the process conditions, installation environment, implementation specifications and other factors. For example, pressure and temperature will also affect the selection of different flange types. It is best to look at some relevant standards.
My personal understanding is that only the following four types of flanges can be used for natural gas transmission pipeline flanges.