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For the moment we have stopped the tests. Will inform on september whe we cotinue with the tests

Thanks everyone for your help. We will make some more tests to check it

Hi, the welds are fabrication welds. All the information I have read till now discourage heat treatment of superduplex stainless (that's why I used forbidden maybe too soon). Just one note that maybe was not clear in my first message. The stress of 100 MPa is the calculated stress obtained by...

Hi, we have made a valve for water at low pressure (2 bar) in superduplex 2507 welding thick parts (100 mm - 4"). The valve stress levels are very low (100 MPa at test pressure 3 bar). But we are getting permanent deformations and each time we make a test at 3 bar it deforms a bit more...

I do not know where it goes exactly but in my experience younger drafters build the 3D models correctly and they are quite good with the 3d tools. But then they take little care about 2D drawings. They just "throw" views and put a lot of dimensions (and duplicate them) but do not take much care...

I agree, differential pressure are alway in kPa o psi. And,at least in European code, it clearly says that all pressures, unless otherwise stated, are manometric. So you only have to detail it if you are working with absolute pressure.

I think at least two: reviewed and approved.

As I understand if there's electrical continuity in static and the valve is correctly earthed there will not be static electricity under dynamic conditions. If you have some element that is not conductive and not correctly earthed then you have many limitations. To measure the electrical charge...

We have two CJP (shell vs vertical flange and shell vs horizontal flange) and one fillet weld (vertical flange vs horizontal flange). See picture Regards,https://files.engineering.com/getfile.aspx?folder=5612b712-e135-4670-8f50-41fe3bfcacaf&file=2.png

Thank you for you help. It is something like the picture attached but the horizontal flage goes to the outside of the vertical flange. So we have the longitudinal seam, the circumferencial and the one to weld the vertical flange to the horizontal one...

Good morning, we are designing a pressure vessel and at one point we have three weld seams that coincide. Does anyone know if there are limitations in the codes (no matter ASME or EN) to this? Regards,

Good afternoon again, I was thinking that you also have EN 12516-2:2014. It is harmonized under PED directive and has calculations for figures like attached. kc in EN 12516 is the join factor (z in EN 13445-3, same criteria) f = allowable stress. Same safety factors as in EN 13445 Thickness...

For flanges bolts over 1" it's recommended to be 8 tpi. In metric bolts for flanges over M36 fine pitch it's recommended. For hydraulic cylinder stems also fine pitch it's used (at least in metric). Regards,

Hi, I've been some research but couldn't find anything either. And the directive itself just mentions parts and assemblies but as I understand you have to calculate the whole assembly. Regards,

I have used the 6th and the 7th. And the 7th distribution (first theory and tables and the end of the chapter) it's much more easy to use.

https://elpais.com/elpais/2020/01/16/inenglish/1579162775_866279.html One of the victims is a man who was sitting inside his home, two kilometers away from the site of the accident. Firefighters have located a one-ton piece of metal that went flying through the air from the force of the blast...

Hi, - Carbon steel: ISO 898 - Stainless steel: ISO 3506 - EN 1515 (specially part 4 if you have to fulfill PED) Regards

Hi, two points: - before doing an stress linearization be sure the results are accurate enough in that area. See https://pveng.com/home/fea-stress-analysis/asme-viii-2-permissible-cycle-life/ (take a look at the whole website, it is worth it). - You already have von Mises stress on the critical...

The eurocode design for steel the fatigue starts at 10 000 cycles (if I'm not wrong). The european pressure vessel code considers fatigue from 500 cycles.

I think PD 5500 is quite similar to EN 13445 but it is not harmonized standard. I wouuld reccomend you to use EN 13445 + EN 10028 wich are both harmonized. Regards