Hi,

I am trying to find out a bit about the history of DIN flange standards. When was the latest revision issued? The latest I have found is March 1975... Is there no later issue?

When was it withdrawn? Did ISO 7005 replace it in 1992? And then EN 1092 in 2001?

The withdrawn DIN standards are still often reffered to in flange catalogues together with EN 1092, so it seems strange to me that there are no later issue than 1975...

All help is highly appreciated!

The latest revisions of the old DIN standards are indeed from 1975. EN 1092 replaced most of the old standards (up to 100 bar as far as I know). Have a look at the attachment. It contains some valuable information.

The funny thing is that most flange manufacturers still deal and supply acc. to the old DIN standards. So, they are still very common. For most flanges dimensions were not changed. I can tell you that we have not found a supplier yet who stamps our flanges in compliance with the new EN. The stamp still says "DIN XXXX".

• http://files.engineering.com/getfile.aspx?folder=22a738a8-176f-4ec7-9676-24

Thaks a lot micalbrch! What you say is also the same as I have experienced. I ordered some EN flanges with designation according to EN 1092-1, but received flanges with DIN Stamps...

Very confusing to learn about "DIN" flanges when you are new to it.. "Same but different" standards, different pipe OD even though DN designation is the same etc...

At least I know now that I have the latest rev of both standards.

The DIN flange standards you are referring to only specify dimensions, as where EN 1092-1 specifies dimensions, accepted materials, ratings, the details of weld ends, etc.etc.
DIN had all this information in seperate standards.

The latest edition of the EN 1092-1 is 2007.

An abnormality regarding to the difference between EN and DIN is the number of bolts used for DN65 PN10/16. EN refers with a note to this difference though.

In the Netherlands it is quit normal that when you ask for EN flanges, you will receive them stamped with EN 1092-1 and material code according EN material. If you are designing under the PED, please note that when the material is not EN material you might need a PMA (particular material appraisal), even if the material is equivalent to the EN material. This is related to the Essential Safety Requirements to convince yourselve and other parties that the material has correct characteristics for your application.

Kelly