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What you need is U-11, 12, 13, or even 14 certificate: U-11. Manufacturer of pressure vessel parts at the above location only U-12. Manufacturer of pressure vessel parts at the above location and field sites controlled by the above location U-13. Manufacturer of pressure vessel parts at field...

SecVIII-1 is used in more typical applications, you can say that in general all pressure vessels are similar. SecIV is about small boilers- try to find two similar constructions of heat exchangers on the market! Konrad Anikiel

Histogram, could you say which particular tuv is it? There are couple different tuv's around. Konrad

And material to UG-10

The study for the EU what you say, well, i have it, but the results are stange because its said that there is more difference between several workshop than between several codes (Div 1 Div2, DBF or DBA). I see it very theorethical. I see it very deeply true. I can spend more time on designing...

Cluain: you are 100% right, 97/23 is newer, thus built on bad experience of older stuff. Sending a sheet of paper with questions and having someone from the purchaser signed it off makes people ask themselves questions, otherwise called "think". Doesn't cost a penny, may save someone's skin...

FYI, it has been discussed here: http://www.onetb.com/forum/viewtopic.php?t=86 Cheers Konrad

Thanks. QW-404.12 applies to supplementary essential variable in GTAW, but it shows clearly the intent. That's it!

Metengr, thank you, this is what I feel, but could you please help me with finding a clear justification of this in SecIX? The AI needs to be convinced somehow... The process is GTAW. Change in F-no is essential both for process and welder. QW-404.4 describes change from assigned to unassigned...

Hello, We're using UNS S43932 under SecIV. There's Note 13 applicable under Table HF-300.1 saying "Filler metal shall be Type 430 with a nominal titanium content of approximately 1.25%". AWS 5.9 ER430 does not specify Ti content, so we can order a custom crafted filler wire with special content...

ukinam, No, I don't consider 1a inwardly flanged. This is not what anyboby said here, including the North Americans. The issue begins clear after browsing an inch of paper forward and opening the book on Page 139, HLW-411.2(a) and (b)- they're linked to sketches which leave no doubt, and noone...

ukinam, No, I'm not intending to use this shape. But it's quite widely used, for instance as bottoms of LPG portable containers. Just my thoughts about inwardly/outwardly flanged dish began on shapes #1 and #2- but apparently it doesn't have anything to do with shape of the dish.

solidhardhead, this issue was discussed a time ago here: http://www.onetb.com/forum/ftopic86.html Konrad

Well, I think that CodeJackal's understanding is backed with some sense. I asked myself a question: why did they say that "inwardly" is less safe than "outwardly", and required more welding on the inwardly flanged body? I think the answer is in the fatigue due to alternating pressure. 1b, if...

doc9960, Why do you think that my sketch #2 is not a flanged head/tubesheet? Would that mean it's exempted fom double weld requirement or that it's not permitted at all? Konrad

Hello, HW-711.1 SecIV allows welding a flanged tubesheet with a lap joint. Whether it has to be a single or double weld, depends on a word that I don't understand. An outwardly flanged tubesheet can be welded with single fillet lap joint, and an inwardly flanged one- must be welded with double...

And for me it's the only hope to make a HX right: to exempt it from UHX. Konrad

GenB, As a matter of fact, I most often do bursting test of a ribbed structure. The disadvantage is that BPVC provides for parts, not connections between them. This leaves an open discussion what to do when during a bursting test some welded/brazed joint breaks. Looks like some requirements are...

Well, I'm not setting stresses to 99% of the Yield Point of the piece of material actually used, like some suiciders do :-) Konrad

The reasons for using ribbed flats are various. Sometimes I use rare and expensive materials, sometimes it's too thick to form, sometimes the design gets more compact with flat, sometimes it's just a pretext not to use UG-34's heavy wall thickness. Konrad