鋼塑復合管分類中A系列與B系列的區別？
In keeping with the current international popular corresponding to two different series of steel pipe diameter: metric series (PN series), imperial series series (CLASS)
A series of imperial series, nominal size with the NPS identification, pipe diameter according to ASME B36. 10 m
B series for the metric series, nominal size with the DN identification, according to stipulations ISO4200 pipe diameter
為了與目前國際上流行的兩個不同系列的鋼管外徑相適應:公制系列(PN系列),英制系列(CLASS系列)
A系列為英制系列,公稱尺寸用NPS 標識，管子外徑按ASME B36. 10M 的定
B系列為公制系列,公稱尺寸用DN 標識，管子外徑按ISO4200 的規定
For the nominal diameter of DN200 diameter: A series (British series) is 219.1, B series (metric series) of 219, of course, the difference was so small that can be ignored, but for other diameter difference can not be ignored:
A series of large diameter is commonly known as the series,
B series is commonly known as the small diameter series
But you can see A series of large diameter DN200 only the following, in more than 12 metric pipe diameter is less than.
In many cases, both difference is very big, such as DN100 time difference between the 6.3 mm, large diameter difference of more than 20 mm
對于公稱直徑DN200的外徑:A系列(英制系列)為219.1,B系列(公制系列)為219 當然,這個差別是很小的,可以忽略,但對于其他直徑差別往往不能忽略:
A系列就是俗稱的大外徑系列，
B系列就是俗稱的小外徑系列
但可以看出A系列的大外徑僅限于DN200以下，在DN300以上其直徑反而小于公制管。
很多情況下兩者差別是很大的：如DN100時差了6.3mm，大直徑時差別達20mm以上
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