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ansi to Din
2

ansi to Din

ansi to Din

(OP)
Looking for a cross reference guide from Din to ansi

RE: ansi to Din

Can you be more specific?

RE: ansi to Din

I am only familiar with the DIN Standard as it pertains to drafting and basic design (fits and the like).

Any new book on drafting should have both DIN and ANSI standards.  Perhaps not as in-depth as you would like but you will get some information.  

My experience with both standards, however, would lead me to beleave that you will not find a cross-reference type of book.  The standars cover pretty much the same material but since ANSI uses Imperial numbers and DIN uses metric you will not find a direct equivalent between them.

RE: ansi to Din

2
There are a number of differences between ANSI and DIN. But the most important factor to consider at the moment is that there is a 'Common Approach' being developed across Europe.

The idea of this common approach is to harmonize standards across the community to reduce barriers to trade between member states. One aspect of this is the Pressure Equipment Directive (97/23/EC). The developments of this is that a number of national standards relating to Pressure Vessels (including 'pipework', 'safety accessories' and 'pressure accessories') are being harmonized as we speak (type, garble, cackle, etc.).

We have recently received the new standard that replaces British metric flanges, I haven't had time to read this yet but I fully expect it to supercede both BS and DIN specifications.

I would suggest that you look at the Common Approach website, a link for this can be found in the CEN forum.

Hope this is of some help.

Regards,

Fawkes.

RE: ansi to Din

A few months ago, I was searching for the differences between ASME, ANSI, DIN and ISO codes.  My understanding is that there is joint effort to make a global standard under the ISO group, of which ASME makes up roughly 90%.  The new codes would be a callobration between all the different codes and standards body.

However, if your company is continually going to be working with both regulations, it may be useful to invest the money to buy both standards, and use the code revelant to the country where the equipment is going.

Hope this provides you some insight.

RE: ansi to Din

As I mentioned earlier, standards across Europe are changing. All European metric flanges (DIN, BS4504, etc.)have now been superceded, the new specification is EN 1902. There is a specification currently under approval for ANSI-type flanges and this is refernced in EN 1902 or you can find the reference by going to the CEN website. To the best of my knowledge these are also to become the ISO standard mentioned above. The new EN 1902 flanges are based on the DIN flanges but there are some changes to the height of the raised face so be careful when using them.

Fawkes

RE: ansi to Din

For flanges checkout ISO 7005. This includes dimensions and pressure ratings for both DIN 2615 flanges, and ASME B16.5 flanges (only now 150# is called PN20)

For piping and pressure vessel codes the "new approach" includes development of EN codes for both:
Both are preliminary but are due to be released in final versions this summer I'm told. As they seem to have been rushed through (as discussed by Fawkes in the CEN forum) there are probably still many errors. The piping code which I have seen is based on a mixture of ASME/DIN and BS standards for the various sections, e.g. flange design as in ASME/BS, branch design as in BS, etc.

prEN13480, part 1 to 5) - the new piping code
prEN13445, part 1 to 7) - the new pressure vessel code

For fittings I don't know of any common standards but butt welding fittings are covered by DIN 2605, 2609, 2615, 2616 and 2617. These fittings are not the same as per ASME B16.9, except for main dimensions.

Valves cannot be compared for dimensional standards as the DIN and ASME pressure ratings are not the same. Furthermore DIN have several dimensions for each combination of valve type, size and rating whereas ASME normally have only one or two.

For materials checkout all the threads in the Materials engineering forum with links to web sites. There are lots of comparison tables around with suitable substitutions, but no exact cross reference list, as there are typically small variations in chemical composition from ASME to DIN.

Fawkes
I had never heard of EN 1902 so I looked it up at www.beuth.de (german standard supplier)
It came up with the title:
"Adhesives - Test method for adhesives for floor coverings and wall coverings "
This doesn't look much like flanges.
Can you tell more about this?

Regards
Mogens



RE: ansi to Din

Mogens,

I was entering the details from memory and as usual its pretty patchy, try EN 1920 or other varitaions. Its worth noting that in Germany the standards for the old DIN flanges are still active as is AD-Merkblatter until the PED becomes compulsary on 29th May 2002. From this point the EN standards are mandatory and so is AD-2002 (I think this is what they're calling it). If you have trouble with the specification i've entered try the listing on the new approach website:

http://www.newapproach.org/NewApproach/ProductFamilies.asp?97/23/EC

This specification has been rushed through, how do I know? Get a copy, look at the drawing for a raised face flange, the dimesions aren't labelled!! You have to backtrack through the specification to find the correct columns in the tables. One good aspect of this standard is that ASME materials are acceptable, and as the standard identifies which elements of the essential safety requirements are covered this means that particular material apopraisals for flanges to this standard in ASME materials are not necessary.

Fawkes.

RE: ansi to Din

Now here's a good idea, after posting the URL above I decided it might be nice to go and get the names so here they are:

EN 1092 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated

EN 1759 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, Class-designated

EN 1591 Flanges and their joints - Design rules for gasketed circular flange connections

Hope this helps.

On the new approach web site EN 1092 is a proposed document, this isn't the case in the UK, the standard has replaced all others.

Fawkes

RE: ansi to Din

Fawkes

Thanks
Good website about the new approach by the way

Only I'm getting more and more confused now about which standards to follow.

I thought that the ISO standards were established to make uniform worldwide standards. When I saw the ISO 7005 for flanges covering both class and PN designated flanges, I did not look for EN standards to cover the same - at least not with new numbers. Whenever possible I expected that EN standards covering the same topic would be adopted with the same name, like fex. EN ISO 6708.

This means perhaps that I can throw out ISO 7005, since it is not in the new approach?

Sorry Hedge for the thread turning slightly out of direction.

Regards
Mogens





RE: ansi to Din

Mogens,

Don't throw anything away. It may well be that ISO 7005 has been incorporated into the EN standards, it may not. Read all the specifications carefully, there is probably a lot of common ground and many suppliers provide flanges with multiple certification and will stamp as required.

The biggest problem with all of this is the battle that appears to loom in the background between the USA and Central Europe. The Americans think that they control all and everything, Central Europe its fighting tooth and nail to prove this isn't so. I know I've just upset one person on the site with such a comment but its about time national boundaries and zenaphobic egos were put to one side and we got on with decent engineering.

Fawkes

RE: ansi to Din

Mogens, and everybody else,

Here is the introduction from EN 1092-1:2001

''
When Technical Committee CEN/TC 74 comenced its work of producing this European Standard it took as its basis the International Standard ISO 7005-1, Steel Flanges.

In taking this decision, CEN/TC 74, agreed that this standard would differ significantly from the ISO standard in respect of the following:

a)Whereas ISO 7005-1 included in its scope both the original DIN based flanges and also the original ANSI/ASME based flanges, EN 1092-1 contains only the DIN based flanges. CEN/TC 74 has produced a seperate series of standards, prEN 1759-1:2000, prEN 1759-3:2000 and prEN 1759-4:2000, dealing with ANSI/ASME based flanges in their original class designations.

b)The opportunity was taken to revise some technical requirements applicable to the DIN origin flanges.

Consequently, whilst the mating dimensions, the flange and facing types and designations are compatible with those given in ISO 7005-1, it is important to take account of the following differences which exist in EN 1092-1:

1) The p/T ratings of this standard have been reduced in many cases by either limiting the lower temperature ratings which can no longer exceed the PN value, or by increaing the rate at which allowable pressures shall reduce with an increase in temperature.

2) In addition to the range of PN 2.5 to PN 40 DIN original flanges contained in the ISO standard, EN 1092-1 also includes PN63 and PN100 flanges.

3) This standard specifies grades of European steels similar to those specified in ISO 7005-1, but in addition permits the use of those grades of ASTM steels which are specified in the ISO standard for use with the ANSI/ASME based flanges.

4) This standard gives an informative annex concerning requirements of EU Directives.

"

I hope that this is of some use.

Fawkes

RE: ansi to Din

Good work Fawkes.

I can see now that I do need the new EN standards, in order to ensure ratings are compatible with those.

Regards
Mogens

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