Outer diameters differences

Is DN125 size the same as 133 fi, 139.7 fi or 141.3 fi?

One of the most frequent problems in requests we receive are the exact sizes in ordered products. The differences usually appear in three most important sizes: DN100, DN125 and DN150. The problem results from differences used in Polish standards. Although currently applied standards in Poland are EN standards, a lot of installations were made according to DIN or even American standards.

Table showing the EN / DIN / ASME differences for the following sizes:

It is worth noting that it is possible to produce and deliver untypical flanges e.g. DN125 according to EN1092-1 with a pipe hole 133 fi. It needs to be agreed in advance between the purchaser and the deliverer.

Your requests are always checked to make sure the technical details are correct and to select correct products. It is worthwhile to take a moment and arrange with your designer or contractor all technical details. Thanks to this our offer is quicker to make and, what is most important, it will contain exactly the products you are looking for.