Regarding Series A and Series B pipes
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I would like to ask the experienced members of this forum. I’m new to design work, and currently there are pipes of Series A and Series B used for piping systems. It seems that according to the chemical process manual, Series A should be used. So which series should be taken as the standard for piping work? This relates mainly to things like flanges. Also, if any kind person could provide a table showing the nominal diameter, wall thickness, and quality specifications for Series B, that would be great! Thank you! Can’t the pipes with brackets really be used? If it says it’s not recommended later, does that mean it can’t be bought? For moving old equipment, I think numbers like 32 are used in those brackets. Thank you
Series A is mainly designed for flanges that meet American standards, while Series B is intended for flanges that meet European standards. Currently, Series B is used in China.
The A series is based on US standards and uses imperial measurements； Series B is the national standard, using metric dimensions. Specific parameters such as the nominal diameter, wall thickness, and mass mentioned by the poster can be found in ASME B36.10 and ASME B36.19 (American standards), as well as GB12459. The above are merely my personal humble opinions; please feel free to offer your guidance.
Series A is the internationally standard series (commonly known as imperial pipes), while Series B is the series used in China (commonly known as metric pipes). You can see that pipes with the same diameter in the ranges HG20592–20635 have different appearances and wall thicknesses. The main issue concerns the proper use of components; pipes, pipe fittings, valves, flanges, gaskets, and bolts must all be selected from the same series of standards.
This post was last edited by Reaching for the Moon in Nine Heavens on 2010-12-9 at 10:34. There are flanges that are compatible with Series A pipes, and flanges that are compatible with Series B pipes; Series A uses imperial units while Series B uses metric units； Seamless pipes are divided into Series I, II, and III. Series I is the general-purpose series, consistent with imperial pipes, and belongs to the **recommended standard series. The dimensions and wall thickness of seamless pipes are specified in GB/T17395-2008
Series A consists of flanges that meet American standards, while Series B consists of flanges that meet European standards. Currently, Series B is used in China.
For pipeline series, refer to HG/T 20592-2009. The nominal diameters in parentheses are not commonly used, but they are still available for purchase. These less common pipe diameters are not recommended for newly installed units, but can be used as a reference for previous pipe diameters in relocation projects.
Series A represents flanges that meet American standards, while Series B corresponds to flanges that meet European standards. In China, Series B is currently in use, as specified in HG/T 20592-2009.
There is another issue: GBT_17395-2008 _Dimensions, Shape, Weight and Allowable Deviations of Seamless Steel Tubes_ recommends the use of Series I, while flanges require Series B. How should one choose in such a case?
Series A represents flanges that meet American standards, while Series B corresponds to flanges that meet European standards. In China, Series B is currently used; for reference, see HG/T 20592-2009.