Steel pipe network to share: seamless steel pipe diameter can be divided into diameter, diameter, nominal diameter

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 outside diameter, for example, a seamless steel pipe with an outside diameter of 108, with a wall thickness of 5 mm, represented by D108*5, plastic pipe Also use the outer diameter, such as De63, other such as reinforced concrete pipe, cast iron pipe, galvanized steel pipe, etc. are represented by DN, generally used in the design drawings to indicate the nominal diameter, the nominal diameter is for the convenience of design and manufacture and maintenance of artificial regulations One of the standards, also known as the nominal diameter, is the specification of the tube (or 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 100 MM can be used for several types such as 102*5 and 108*5. 108 is the outside diameter of the pipe, and 5 is the wall thickness of the pipe. Therefore, the inner diameter of the steel pipe is (108*5 -5) = 98mm, but it is not exactly equal to the difference between the outer diameter of the steel pipe 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 the 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.
The seamless steel pipe knowledge is published by 51 steel pipe network.

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