Dear experts,
I didn't get a complete answer on a similar question asked about this on ASME forum, so I hope you may explain me what is the tolerance as per B16.9 for the misalignment of the fabricated elbows? We had measured 2.5mm internal misalignment on the 36" 90Deg. elbow. Client insists...
Hi ElCId,
It's a good question especially because ASME VIII is a design standard. Although there are strength requirements for joints but some guidelines on joint configuration would be also nice.
KevinNZ, thank you for your feedback.
In that table they don't mention anything about misalignment though. I am wondering if the Note 5) belonging to Fig.1 "Maximum Envelope for Welding End Transitions" is referring to angular misalignments. Here is the text: Note 5) "Where transitions using...
Greetings to all
B 16.9 in paragraph 7 refers to so called "collaped arcs". It reads as follows:
7 SURFACE CONTOURS
Where adjacent openings in fittings are not in parallel
planes, they shall be joined by a circular arc or radius
on the external surfaces. The arc or radius may be terminated
in...
Denstan, thanks. I agree, it is not the smoothest transition but this isn't for cyclic loads so should be fine. And it is much better that what was there before.
Gator, well spotted - they didn't turn it. Simply completed the welding. And to be honest, we are confused with this "orientation" thing. In the first image it seems that the weldolet should be flipped but now, when they filled up and completed the weld it looks allright...
Agree?
Gator,
This was picked up upon periodic visit to the shop and now it has been welded in proper way (see photo)
Thank you guys for the feedbackhttp://files.engineering.com/getfile.aspx?folder=8893fb50-2f86-4e42-826c-8797355b661a&file=DSC04107.JPG
Hi LittleInch,
Thank you for the post. Good one! However in our case I think the weldolet was installed upside down and without the due machining. My recommendation was to redo it and I'm trying to get the info now as to what has actually happenned...
JT
Gent's sorry for not reacting to your valuable feedback so long. Due to unknown to me reasons the notification emails were ending up in the junk folder, so I didn't see any feedback till today... This is first time this happens, normally I get it all in my inbox.
Thank you all for practical tips...
Hi all,
Could this be right (see photo attached)??
Generally speaking, which standard specifies how the weldolet branch connections shall be fitted? I mean when it's set it, set on etc. and what's the proper orientation (meaning which side goes onto run pipe)?
Thanks in advance for all kinds...
Hello
Could someone help me to understand how do I interpret these bend angles and the projections under them? What does fitter actually do with these figures when laying this line? And from inspection point of view - how can I check in field that this bend angle is actually correct?
Another...
Thank you guys for your input.
DekDee, I am not sure about that last line of yours. PED allows mixing if you are choosing a more stringent standard/norm but not other way around. So IF ASME is less stringent than EN norms in NDT requirements then PED demands you to follow EN norms. The question...
PED is Ok if you design according ASME as it gives more wall thickness and therefore doesn't harm but NDT acceptance criteria under EN norms are more stringent. So naturally they want EN norms to be used for that.
Thanks XL83NL!
It was an interesting read. After talking to authorities coordinator, I have the feeling that the problem isn't that big as PED seems to be flexible to accept ASME design because it's usually higher wall thickness than EN. However, NDT requirements in EN are more stringent and...
Hello respected specialists,
We have our standard piping design according ASME norms and the client is in one of EU countries where PED norms apply. The client who will do the welding has all of his procedures and welders qualified according EN norms and if they have to now requalify...
Thanks so far for all the input. Gator, i am saying thicker wall because it is expected that in 20 years there would be some wall reduction on existing pipes and new pipe will be then thicker. This is risers and downcomers to the steam drum and connecting piping to the transfer line exchangers...
Hello All,
My Client wants to replace some of the old equipment in the plant and the question is weather to replace or not the piping which is connected to this equipment, which is also of the same age (20 years). At this moment I dont have any maintenance inpsection reports and do not have...
Metengr, is this a correct understanding that the higher the nickel, the better? In this case why not use ErCrMo-3 which has higher Ni content (60%) than ErCrNi-3?
Thanks guys.
Arunmrao, what do you mean by a higher grade Ni electrode? Like ErCrMo-3? It has 60% Ni - is that what you mean?
Metengr ErCr-3 was also my suggestion from what we have at hand. However, since they are going to be pulling 16 meter pipes through this plate I hope this structure will...
