ASME B31.3 Interpretation Issue 3

[pegus]

Good day everyone,

I recently started reading ASME B31.3 in order to design my pipe line according this code.

I have an issue to understand the meaning of paragraph 302.3.2 Bases for design Stresses, in this paragraph list the bases for establishing the allowable stresses for the materials listed on the code for example for bolting materials:

-1/4 of the tensile strength at room temperature
-2/3 of the yield strength at room temperature
-2/3 of yield strength at temperature
-100% average stress for a creep rate of 0.01 per 100h

Do these properties mean that the listed allowable stress fulfill this requirements? or that I need to get those values from the listed maximum allowable stresses?

Regards!

 

[XL83NL]

Table A-1 is based on the outlines of 302.3.2, so you don't need to apply those factors (again) when using stress allowables from table A-1. If you use a material not listed in table A-1 (i.e. a non-listed material), you need to follow the requirements on table 302.3.2, amongst others.

 

[TGS4]

pegus - based on the flurry of questions that you have posted in multiple fora, it would appear that you are completely out of your technical ability.

Your profile says that you are posting from BC (I'm going to assume Canada, as I believe that there is a bug in the site's location algorithm). I should remind you of the Canadian engineering requirement that you practice engineering only in the subjects that, by virtue of your training and experience, you are competent in. Based on you questions, you are not competent, and will likely lead this project of yours (which is at a very high temperature and a pressure that can cause serious damage) to potentially catastrophic results. You have an obligation to protect the public - an obligation that you are not discharging by getting anonymous advice off an internet forum on a topic that you yourself have no idea about; advice to questions that I am certain that you are only providing a quarter of the necessary information.

Get a mentor who knows this stuff. Get your employer to hire a skilled contractor or consultant who knows this stuff, and learn from them.

 

[pegus]

TGS4 - Thanks for your advices, you are right, I am a new mechanical engineering that are developing these new tasks. Asking in this forum does not mean that I will take everything literally and justify my work saying that I read it on internet, I use the information that you say to give me a better understanding of what topics research more. As I am a new engineer, every work I performed is evaluated by a peer, and I also get reference information of similar analysis to based mine in the new ones, but as some reference information is hard to comprehend, that is why I research in forums, I just want to understand better what I am developing now, because every work I performed teach me something new.