Galvanized pipe is a kind of welded pipe for low pressure fluid transportation, also known as general welded pipe. So what's the size of the galvanized pipe?
Galvanized pipe is actually galvanized steel pipe, so as to improve the corrosion resistance of steel pipes. Galvanized pipes are divided into galvanized and hot-dip galvanized pipes. In contrast, the corrosion resistance of hot-dip galvanized pipe is much stronger than that of galvanized steel pipe. Because the galvanizing layer of the hot-dip galvanized pipe is thicker. Galvanized pipes are mainly used for gas and heating pipes, but not for water pipes.
Generally speaking, the diameter of Ji'nan galvanized pipe can be divided into outer diameter, inner diameter and nominal diameter. The outer diameter of pipe for seamless pipe is expressed by the letter D, and then the size and wall thickness of the pipe are attached. The nominal diameter of the pipe is not equal to its inner diameter and outer diameter.
The nominal diameter is close to the inner diameter, but it is not equal to the diameter of the diameter of the inner diameter. In the design drawing, the Ji'nan galvanized pipe should be called the nominal diameter. The purpose is to determine the pipe, pipe, valve, flange, gasket and other structure size according to the nominal diameter. The nominal diameter is used to use the nominal diameter. The number DN indicates that if the outer diameter is used in the design drawing, a piping gauge table should be made, which indicates the nominal diameter and wall thickness of a pipe.
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