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If you are able to use DIN you might be interested in DIN 28083 for support lugs, DIN 28084 for support rings, and DIN 28086 and 28087 for lifting lugs. I do not know what your design code is.

Looks like there has been a laminar dislocation which grew by bolt tension to the diameter of the bolt hole and clearly stopped there where tension in the material becomes pressure. Then you put torque on it to loosen up, and it is a well known fact that if you want to destroy anything, put...

I recognise the lack of detail. We use the same between EN13480 and 13445 mainly. For instance the detailed explanation about hydrotesting in part 5 in which the 13445 is more clear about when creep is applicable. But other than that one has to be careful.

You are right, I know about this Guideline. And you will most likely place yourself in an almost impossible situation if you would be mixing design codes. I read it more like it is allowed to use different codes in design, manufacturing and inspection. But indeed, close reading it can be...

PED requires that ALL pressure bearing materials are traceable. The practical problem however is marking. Se PED guideline 7.4. 3.1 at least is required for cat. II, III and IV equipment. See also PED Guideline 7.8 I know from practical point of view that it is allowed to receive a bundled...

I do not think mixing design codes is allowed in the PED. Which design code are you going to engrave on the name plate? If you are using a PMA make sure that the manufacturer (in terms of the PED, not nescessarily the company that actually "builds" the system) accepts this PMA. You might be...

If the joining flange is raiced face it does not matter. The surface outside the raised face portion can not apply pressure to the gasket and thus has no effect on the closing parameters. Not sure it helps, but just FYI.

Okay, I presumed it was about allowable stresses for internal pressure, but this is about external. I can not help you there. The Dutch Rules for Pressure Vessels do not make a distinction.

I am at work now. And indeed it is Annex E. However, I do not think you will be able to succesfully calculate acc. this annex either. Perhaps EN 1591? But a calculation according to this standard would require software because it is quite comprehensive. What is your design code? If you are...

Might it have something to do about the difference in the 0,2% yield strength for CS vs 1% yield strength for SS?

Why should it not? EN-codes lean very heavyly on DIN, that is correct, but they are not just a copy. Of the DIN flanges there are also not very much PT-ratings available with regard to EN 1092-1. I think the EN-1092-1 is a evolution of the DIN standards and very well possible the flange failed...

Flange ratings are quite conservative. You could recalculate the flange at the hydro pressure used. Another reassuring fact is that the yield strength you are calculating the hydro case with is appr. 95% of a value that most likely is lower than the actual yield strength of the material used. If...

I know. Some people just need a different approach to get the picture. (No offence to anyone).

Netherlands: Dutch Rules for Pressure Vessels (Regels Toestellen onder Druk or RToD) (the last issue of this standard has been sent out September 2005, this code has been frozen). Germany: AD Merkblätter (I have no idea about the status) Acc. to EN 13480-3 issue 2013: According to the...

They will probably be pressed in a die out of a plate. When the size of the cap becomes that large that plates have to be welded together before pressing in the die, it will be welded. However, those sizes will probably be called a head then.

You could weld strips on the pipe at both side of the clamp to prevent it from "slipping".

At ambient temperature normally the yield strength is leading for the allowable stress, normally Re/1.5, but there are exceptions. By hydrotesting at 1.43*PS you reach 1.43*Re/1.5=approx. 95% yield strength. Just another vision on what DBreyer wrote. I thought it might help. Kelly

Stress Corrosion Cracking

I am not familiar with EN 12952, but when I see "boilers" P195GH and P245GH do not seem the best choise of materials to me. What is your PS and TS? I could advice a material choise though, because I have some experience in high pressure high temperature steam piping. Kelly

Are you working in the creep region? I am not sure wether you will find creep data for austenitic stainless steel.