Does the Owner have a piping line class specification? You should check any NDE requirements there, too. I concur with Steakman911.
Putting Human Factor Back in Engineering
As I was searching through the different treads of this forum, I found some good info regarding the bake-out, but there was not much discussion on the practices. I would like your opinion and advice on the bake-out temperature and time. So far the mnost common are the temperatures between 200°C...
Sorry Guys. Forgive my frustration.
It was not my intent to question your abilities. Most fabricators, I had misfortune to encounter, were totally relying on PWHT contractor, who could not even provide a decent PWHT procedure. When I talked emperature gradients, they gave me that absent look...
Good point weldtek. Thank you for that.
Please remember though that the Code is a set of minimum requirements not a pressure vesel design handbook.
Good engineering practice will dictate how to make provision in PWHT procedure for the nozzle, which is substantially thicker than the shell...
Great thread:
some picky comments that came to my mind; and sorry if I repeate what was already said.
1. Don't put in the heat treatment furnace something that does not require heat treatment: blind flanges (and bolts); unless there is good reason to do it, which was not mention in the initial...
I have to support JR97. So called "cold cracking" or "hydrogen cracking" is the factor in selecting the delay.
The reason for the delay before liquid penetrant or magnetic particle examination is to allow all the hydrogen from metal to migrate to microvoids in material and cause cracking...
I think, the most important question I always have to ask myself is: is it coaching or is it mentoring? Most of you Esteemed Ladies und Gentlemen are very eloquently touching on "teaching the right way and ensuring the "young ones" follow our ways".
I am not that youg anymore and continuously...
ASME BPV Code addresses only the new fabricated vessels, not repairs. Neither does it deal with various services. For the repairs i suggest API 510 for inspection and National Board Inspection Code old ANSI NB-23 for suggested repairs. Also, do your self a favour: do not stick the austenitic...
JStephen your comment is duly noted. I don't think JLSeagull mentioned TX in his question. I apologize if I missed something.
Putting Human Factor Back in Engineering
I am not sure why anybody would like to risk the use of questionable quality material on vessels.
The mentioned UCS 6 (b)(1) suggests that the vessel may leak. I agree that SA-36 may meet the SA-516 strength but also it may not. Lottery or russian roulette? I don't want it in my vessels...
Well, in my humble opinion, the quest for ruling on what is and what is not a pressure vessel should start at the local authority. The lack of legal description of the vessel by this authority would warrant code definition to be applied. Don't forget the code is becoming law if referred to by...
I love this disecting of every word in the code.
In my understanding meteng's statement is correct that the code is addressing the multiple PWHT cycles.
To confuse the issue more:
How do you ensure with your famous (or infamous) 80% the heating and cooling rates of multiple PWHT are...
Just a stupid thought. Have you tried tracing the U-1A's with the original vessel manufacturer? Another possibility is the AIA (if you know which one cosigned the form).
Putting Human Factor Back in Engineering
Hi guys,
I found some conflicting information in the thread #177-44286.
Can anyone, who is in posession of pre 1962 ASME check for me the allowable stress value for SA-212 B in room temperature?
Thank you kindly.
Putting Human Factor Back in Engineering
Design gurantee does not always cover the material and fabrication. Your PWHT qualification is important for a couple of reasons. One of them is to confirm design strength of material after a number of cycles. I hope you requested at least one extra cycle for your maintenance.
I see no reason to...
As usual metengr made it extremely difficult to top his answer up. Fully agree with metengr either weld material: matching P1 or P4 can be used. Three small comments.
1. Careful with material thickness. Due to its strength the P4 material requires less wall thickness. Ensure the joint: both P1...
gbratis
variance is a deviation from a code granted by local authority as a blanket or for a specific purpose. It can be issued for any code requirement: insppection, test, design, material etc.
In regions regulated by jurisdictions those jurisdictions specify design, fabrication and testing...
