Why can’t pipes with diameters of DN32, DN65, DN125, and DN175 be chosen unless there are special requirements?

2011-03-07View Original

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I’m not quite clear about the issue mentioned in the process pipeline installation design manual :dizzy:

Reply #22011-03-07

They do not belong to the most commonly used first series; they are part of the second series, and can be chosen if necessary

Reply #32011-03-07

I haven’t heard of a DN175 specification; I believe the main reason is that these specifications are not commonly used, including the accompanying flanges, bolts, gaskets, etc. In both Series I and Series II of HG20553, there are pipes of corresponding specifications. However, Series I is the same as international standards, while Series II belongs to metric pipes and is an obsolete series

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Why can’t pipes with diameters of DN32, DN65, DN125, and DN175 be chosen unless there are special requirements?

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