What you a doing by invoking the paragraphs you mention is not a true "stress check" as we normally think about it for B31.3 It is a check of the "operating" stress (which doesn't have a code allowable) without stress intensification factors applied vs the basic allowable stress for the...
I certainly came of age with the default "conservative" allowable stress mentality. For the most part, we still keep it as the default for the first pass. For many systems, pipe stress isn't the limiting factor anyway. Nozzle loads and structural loading tend to be the real limits.
I will...
I've got an update to report on my case. While folks are in agreement that API 686 has some ambiguity and apparent internal conflict between what that figure B.3 says and what the body text says, the client specs do not. Our client standards are clear on the 5D with no exception for top/side...
I've had a rather strange issue come up and I'd like to see how it compare with everyone else's experience. I'm sure most of us here are aware of API 686 for "machinery installation" and the requirements for piping design. Specifically the 5D of straight run requirement.
Chapter 6, Section 3...
In my experience, my clients see "design conditions" as being the basis for calculating the required wall thickness of a pipe. Our line list automation works on that basis. The "Flexibility" temperature for stress analysis is a different concept. We generally state in our design basis that...
As I've gotten older, I've come to realize that springs are better avoided when possible. As for liftoff, if your stresses, equipment loads, and deflections are acceptable without the support active (i.e. lifted), then let it lift. Springs should be used when that support going inactive...
As others have noted, Caesar won't check the local stresses that you need to consider for a support attachment - this is true for dummy legs, lugs, saddles, whatever. That's just not within the capacity of a Caesar beam element model.
The Paulin suite of tools is really something every stress...
I'm surprised it's only three so far
$1 million lawsuit filed by injured workers in Pemex Deer Park hydrogen sulfide release
“If owners and operators of oil refineries follow the proper policies and procedures designed to protect people, then the release of highly toxic gases does not happen,”...
At low levels, you can definitely smell the rotten egg scent of H2S. However, at levels that rise to immediate danger, you nasal receptors get overloaded and you don't smell it anymore.
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"
All opinions expressed...
Shelter in place has been lifted. Death toll now at 2 with another 35 injured.
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"
All opinions expressed here are my own and not my company's.
Still developing, so no details on the cause, but local areas are still ordered to shelter in place.
PEMEX Refinery H2S leak
H2S is pretty nasty and most of us local have had to go through safety awareness training specifically for it. Many facilities require folks to wear H2S monitors where...
The driver of the SUV has finally been identified. And, for the love of all you hold dear, avoid the comments section. People are terrible.
human-remains-found-in-suv-that-struck-deer-park-pipeline-identified
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"...
The fire has died down significantly and investigators have been able to get into the area to begin their work. Not surprisingly, they found human remains in the car. That cannot have been an easy thing to look upon.
Human Remains Found
Edward L. Klein
Pipe Stress Engineer
Houston, Texas...
Wow, that video of the crash is impressive. The eye witness report from earlier suggest the driver had some kind of medical incident and ended up flooring the accelerator. It was definitely moving fast in that video clip.
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is...
