Variable diameter pipe refers to a pipeline with two or more ports of different diameters. Its pressure loss is equal to the sum of the pressure losses of each pipe section, and it is often used in situations where there are multiple branch pipes along the way. It is also possible to gather the inlet ends of several single or multiple pipelines through distributors or other devices, and connect the outlet ends in the same way to form a pipeline network. In theory, the pressure loss values of the fluid in each branch pipe are equal, and the flow rate at the pipeline connection point is equal to the sum of the flow rates of each branch pipe. Often used in situations with large throughput or multiple expansions.
A closed loop formed by connecting various pipelines. Often used in oil and gas gathering and transportation pipelines in oil and gas fields, as well as in urban water supply or gas distribution pipelines. The reliability of transportation is higher than that of branched pipe networks, and there will be no interruption of transportation after a certain point due to a malfunction, but the total length of the pipeline has increased. At each node of the pipeline network, the outflow and inflow are equal.
A reducing pipeline with a nominal diameter difference of one level between two ends is called a first level reducing pipeline, a reducing pipeline with a difference of two levels is called a second level reducing pipeline, a reducing pipeline with a difference of three levels is called a third level reducing pipeline, and a reducing pipeline with a difference of four levels is called a fourth level reducing pipeline;
According to the size chart, if the diameter is one size smaller than the main pipe, it is called the first level of diameter reduction, and if it is two sizes smaller, it is called the second level of diameter reduction……
For example, DN300-150 is a third level variable diameter, DN300-200 is a second level variable diameter, DN300-100 is a fifth level variable diameter, and so on!
