钢塑复合管分类中A系列与B系列的区别？
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
为了与目前国际上流行的两个不同系列的钢管外径相适应:公制系列(PN系列),英制系列(CLASS系列)
A系列为英制系列,公称尺寸用NPS 标识，管子外径按ASME B36. 10M 的定
B系列为公制系列,公称尺寸用DN 标识，管子外径按ISO4200 的规定
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
对于公称直径DN200的外径:A系列(英制系列)为219.1,B系列(公制系列)为219 当然,这个差别是很小的,可以忽略,但对于其他直径差别往往不能忽略:
A系列就是俗称的大外径系列，
B系列就是俗称的小外径系列
但可以看出A系列的大外径仅限于DN200以下，在DN300以上其直径反而小于公制管。
很多情况下两者差别是很大的：如DN100时差了6.3mm，大直径时差别达20mm以上
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