Most general corrosion, maybe some pitting.
Yes, we have an old bundle in the shipyard that we use to qualified vendors
that's what i plan on doing with this vendor if they come out but i wanted to check with the experts here to hear any feedback.
thank you for responding.
Hi All,
I'm looking into alternate technologies that can measure for detects and wall lost in heat exchanger tubes. We been using IRIS and ECT. I recently learned about Acoustic Pulse Reflectometry (APR)and apparently the major benefits is that it's minimally invasive and it's faster than ECT...
In times like these, it would help to get their supervisor involved as well as yours.
Sometimes bringing others into a discussion especially those that are higher up can create a new dialogue that can yield an understanding.
I have done this a few times with inspectors actually and it always...
Thanks all for the replies.
The equipment that I'm looking appears to have a 2% difference between the two equations.
While that may not seem like much, as you imagine if the thickness is closer to the higher reading would it be risky to go with the higher Tmin? It will help increase the...
Equation in UG-27c gives a different minimum thickness than the equation in Appendix 1, 1-1(a)than for the same pressure vessel.
Which one should I use? Am I missing something?
To OP's point, how are the ASME VIII exemptions determined?
why is a pressure vessel with a diameter less than 6" exempt from the code?
I wish these codes contain more background information on have reached their requirements.
Snickster, after reading that i drew a sketch and now it clicks! I appreciate you breaking that down further for me. For the record I'm a chemical engineer so some of this material is a bit foggy in my head.
For Yt/St I meant Yield Strength/Tensile Strength. sorry for using the wrong variables.
Thanks 1503-44. I never had yield stress explained to me like that before. Fascinating
Snickster:
"Since the material in the plastic region cannot support the load beyond the plastic stress then the width of the plastic region is spread out further from the point of the discontinuity until the...
I was reading a thread about local plastic deformation and strain hardening effects and there were a couple of comments that I found to be confusing. Below is the link to the thread along with the two comments in question. I provide input below:
Thread...
@LittleInch
"as well as the fact that the design intention is to allow repeated entry into the inside, in this case via a time consuming removal of several large bolts..."
This is an interesting point that i haven't heard of before. It makes sense conceptually. Is this mentioned in a codes or...
In u-1(2) e in ASME VIII, it exempts "piping components" such as "strainers".
Mechanically, filters and strainers can be very similar.
However, this gas filter I'm looking at is ASME VIII stamped and i was told it isn't considered a "piping component". Can someone tell me why? thanks...
What was the fabricator's reason?
As others have pointed out, you have to check to make sure the scaffolding is secured. Are the pads and scaffold rated for the pressure?
Is there a liner or coating inside the equipment? if so, make sure the scaffold doesn't damage that during the test.
Thank you all for the responses. I do understand one is rare to one engineer may not be rare to another. My apologies for not making that clear.
I was just curious to see what others have experienced.
I try to read API 571 often to become more aware of 70+ mechanisms.
In API 571 there is about 70 different types of damage mechanisms list. Of course, each different mechanisms has a variety of variants.
From your experience, which mechanism is the most rare? Personally, I have never seen dealloying myself.
