Pipeline connection method
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There are several types of pipe connections within the station, including welding and flange connections! I would like to ask which one is the best, and how should I choose the connection method? Why is a straight pipe section needed when connecting elbows?
The elbow connecting to the main straight pipe should be used to enhance welding strength and reduce friction. The piping connection method mainly depends on the material used for the connections; flange connections are generally used for pipes made of different materials. Or in some places, flange connections are used to facilitate disassembly (without the need for welding)
Generally, valves need to be installed in order to add flanges; welding is a more reasonable option in other cases, as it helps to reduce the number of sealing points.
The connection of pipelines is generally divided into threaded connections, welding, and flange connections. Water-gas pipes with low pressure and small diameters generally use threaded connections. For pipes generally larger than DN50, welding is the commonly used connection method. Welded pipe connections are the most widely used form; they are easy to install, strong, airtight, practical and reliable, and can save steel. This method can be used wherever disassembly is not required during use. Flange connections are required at the points where pipes are connected to valves or equipment, as well as where pipes need to be removed.
Different media have different requirements; you’ll understand if you read a book on pipeline design
The 4th floor is the correct answer: flanges should be used at the points where connections are made to the equipment, while welding should be used wherever possible elsewhere
Station areas typically consist of high-pressure and medium-pressure vessels and pipelines. Therefore, aside from the equipment (valves, separators, pressure regulation systems, metering systems, etc.) which are connected using flanges, all other pipelines must be welded in accordance with relevant standards and industry regulations. Additionally, radiographic testing, strength tests, and pressure tests for tightness must be carried out, and the results must meet the specified requirements before the pipelines can be put into operation Elbow connections to main straight pipes (where the pipe segment is larger than the diameter of the straight pipe) are primarily used to enhance strength.