If the OP's workplace is anything like mine then the OP will get one of two answers when asking for temperatures for both above ground and below ground pipe. It's either ambient or 100F. No one takes the time to see what temperatures the line will actually experience. I know that if the pipe...
I'd actually like to know the answer to this one too. I assume you mean the operating and design temperatures are "ambient" correct?
I've heard different senior stress engineers suggest using anything from 100F to 160F as an ambient, blocked-in temperature for analysis. The most common...
LittleInch, to answer your question, that's why I'm here :)
More experienced pipeline engineers and/or designers tell me don't weld on the pipe (pad or no pad). But there's never a reason why we shouldn't weld on the pipe.
One of the more difficult aspects of pipe stress that I'm learning...
I agree with both of you. By the way, do you two know each other? :)
This seems to be an argument I have at least once a month. Maybe I'm not communicating it well enough. If the code allows this, and if my calculations say we won't overstress the pipe then why is welding to the pipe (or to...
I've been working in pipe stress analysis of pipelines, compressor stations, and pump stations for about 2 years now. A recurring issue that I've run into in this time is welding supports to pipe under the pipeline codes.
Every designer and engineer that's been in pipeline for a while...
DSB123,
This is off topic, but if you really want to educate a young, inexperienced engineer maybe you could take a shot at my question in thread775-361875
http://www.eng-tips.com/viewthread.cfm?qid=361875
(I hope I linked those properly)
No one else has replied, and when I ask people at my...
Sorry for replying so harshly. I'm used to another "engineering" forum that's been overwhelmed with trolls in the last few years and I guess I projected that onto this one.
I have been trying to find an experienced stress engineer to work under for years, but I've realized that my...
DSB123,
I guess I did say "any advice is appreciated." That was my mistake...although this hardly qualifies as advice.
I didn't realize that seeking training meant that I was simply going to plug information into CAESAR II and print reports.
How do you know that I'm not already working under...
Does anyone know of some good pipe stress training courses? I'm especially interested in the dynamic analysis (water hammer, earthquake, wind/wave, etc.).
I'm hoping to get approval from my company for the CAESAR II dynamics course, and I've purchased L.C. Peng's book on pipe stress (which may...
I'm hoping someone out there has some experience on this subject and can help guide me in the right direction.
I'm working on a stress analysis that involves a pipeline valve station during a surge event (after closing the valve at this station). I have pressure vs. time data at each elbow in...
Again maybe I'm confused as to what you're asking, but all of these equations are based on the equations we learned in college. These were developed from experimentation and then modified to use safety factors.
You'll see slightly varied forms of these equations in all the different codes...
jkal321,
That's not the same code that we were talking about. We were talking about ASME B31.4 for pipe. That looks like it's referencing ASME Section VIII for pressure vessels.
I'd like to know the same thing Brad.
I'm still new to stress analysis but I've seen a lot of companies have criteria for when to do analysis and what to look for for in-plant piping. For example, if you're pipe is over X inches in diameter and over Y temperature, stress analysis is required...
I don't have a copy of ASME B31.4 in front of me, but when I posted this I was using the most recent version of it. If I remember right, that was from Table 403.3.1-1 as mentioned in BigInch's post.
BigInch,
Thanks for the reply.
I'm reading the 2012 version of the code (and maybe CAESAR is based on an older version), but the allowable stresses are as follows for Additive Longitudinal:
Restrained Pipe: 0.9 Sy
Unrestrained Pipe: 0.75 Sy
Riser Pipe: 0.8 Sy
Slurry Pipe...
Hi, I couldn't get an answer on the Intergraph forums so I'm hoping someone on here can help me with this.
Recently, I ran an analysis of a pump station piping system in CAESAR II. The code I used was ASME B31.4 and the material was A-106 Gr. B. The temperature was 100F and the pressure was...
No this is really good information. It confirms what I read before. I should have posted my question here first instead of trying other "engineering" forums.
This is actually for a pig launcher/receiver, so I'm thinking we may just ensure that the pigging procedures does not permit...
I've been told that the minimum permissible temperature of API 5L material according to the pipeline codes (ASME B31.4 and B31.8) is 32F. In ASME B31.3, the minimum temperature of API 5L is -20F according to the stress tables in the back.
Does anyone know what the actual minimum permissible (or...
