In general, the tube diameter can be divided into the outer diameter, inner diameter, nominal diameter. The outer diameter of the pipe seamless steel pipe tube with the letter D and subsequent additional outside diameter size and wall thickness, for example, the outer diameter 108 seamless steel tubes, wall thickness 5MM, D108 * 5, the plastic tube outer diameter, said, such as De63, such as reinforced concrete pipe, cast iron pipe, galvanized steel pipe using the DN for the nominal diameter, commonly used in the design drawings to represent the nominal diameter is artificially provisions in order to design and manufacture and maintenance convenience a standard, than the nominal diameter is the name of the tube (or pipe) specifications. The pipe nominal diameter and the inside diameter, outside diameter is not equal, for example: the nominal diameter 100MM seamless steel pipe Post 102 * 5,108 * 5 good several, 108 for the outer diameter of the tube, the tube wall thickness, Therefore, the inner diameter of the steel pipe (108 * 5-5) = 98MM, but it does not exactly equal to the pipe diameter minus twice the wall thickness of the difference can also be said, the nominal diameter is close to the inner diameter, but not equal to the inner diameter of the name of a tube diameter specifications, design drawings so use the nominal diameter, is according to the nominal pipe diameter can be determined, pipe fittings, valves, flanges, gaskets and other structural dimensions and connection dimensions, the nominal diameter using symbols DN said that if the outer diameter expressed in the design drawings, should be made to pipeline specifications table, show that a pipe nominal diameter, wall thickness.
Tube series standard
pressure pipeline design and construction, first consider the selection of pressure pipelines and their components the standard series. The application of the standard system of the world can be roughly divided into two categories. Pressure Piping in Table 3. Flange standards in Table 4. Table 3 Pressure Piping
of
classification the large
OD series
small diameter series
specifications
the DN-public said the diameter
Ф-outer diameter
DN15-ф22mm , DN20-ф27mm
DN25-ф34mm, DN32-ф42mm
DN40-ф48mm, DN50-ф60mm
DN65-ф76 (73) mm, DN80-ф89mm
DN100-ф114mm, DN125-ф140mm
DN150-ф168mm, DN200-ф219mm
DN250-ф273mm, DN300-ф324mm
DN350-ф360mm, DN400-ф406mm
DN450-ф457mm, DN500-ф508mm
DN600-ф610mm,
DN15- ф18mm, DN20-ф25mm
DN25-ф32mm, DN32-ф38mm
DN40-ф45mm, DN50-ф57mm
DN65-ф73mm, DN80-ф89mm
DN100-ф108mm, DN125-ф133mm
DN150- ф159mm, DN200-ф219mm
DN250-ф273mm, DN300-ф325mm
DN350-ф377mm, DN400-ф426mm
DN450-ф480mm, DN500-ф530mm
DN600-ф630mm,
Disclaimer: The above "Cold galvanized steel pipe standards" header information shown by the enterprises themselves, the authenticity of the content, accuracy and legitimacy of responsibility by the publisher. China Steel Harbor does not undertake any guarantee responsibility.
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