DN40 seamless steel pipe knowedge

DN40 seamless steel pipe can be converted to the outer wall thickness. D40*2 or D40*3
In general, the diameter of the tube can be divided into outer diameter, inner diameter, and nominal diameter. The outside diameter of the pipe, which is a seamless steel pipe, is indicated by the letter D, followed by the size and wall thickness of the outer diameter. For example, the seamless pipe with an outer diameter of 108, with a wall thickness of 5 mm, is represented by D108*5 in the design drawing. The nominal diameter is generally used to indicate that the nominal diameter is a standard that is conveniently and artificially specified for the design, manufacture, and maintenance. It is also called the nominal diameter and is the specification name of the pipe (or pipe fitting). The nominal diameter of the pipe is not equal to its inner diameter and outer diameter. For example, the seamless steel pipe with a nominal diameter of 100mm has several types such as 102*5 and 108*5. The outer diameter of 108 is the outer diameter of the pipe, and the wall thickness of 5 is the thickness of the pipe. Therefore, the inner diameter of the steel tube is (108*5-5)=98MM, but it is not exactly equal to the difference between the outer diameter of the steel tube and the thickness of the two walls. It can also be said that the nominal diameter is close to the inner diameter but not equal to the inner diameter. A pipe diameter specification name, in the design drawings, so use nominal diameter, the purpose is to be based on the nominal diameter can determine the pipe, fittings, valves, flanges, gaskets and other structural dimensions and connection size, nominal diameter using the symbol DN Said that if the use of the outer diameter in the design drawings, should also make a pipe size comparison table shows the nominal diameter of a certain type of pipe, wall thickness.
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