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BTW, if you don't have a WPS / PQR for welding P1 to P8 per ASME IX / VIII then the welding idea won't be possible. Do you have one? Does it require PWHT? I'm assuming you could get away with none considering 316 is annealed condition. Not sure about what is needed on the CS side. ASME will...

A galvanic / electrical potential chart will show two values for stainless: passivated and unpassivated. This accounts for the protective layer (or the lack of one).

Right. I'm trying to get my hands on B16.5... trust me. We have a hardcopy, but I need a digital one. Thanks for all the help

I realized what it was right after I typed this up and now I feel bad I submitted the question. The reference has to do with weld repairing during the casting / forging phase.

I sent the question into the ASTM.org website. We'll see what they say about the IX reference. I've asked an API person a question before and was blown off. Those people have regular industry careers, so they probably just have "better things to do".

Maybe it is a mistake in the A182 spec?

Yeah, I found that odd. I'm just telling you what it references. You can check for yourself (I don't want to break any rules for sharing snipets of code). However, the actual code that gets referenced inside BPVC Section II is SA182, not A182. I'll have to dig deeper. I was also surprised...

Thanks Mike. That's what I was shooting for. ASTM A182 does reference ASME BPVC IX. I think we are basically saying that other materials are "pre-approved", while 410 requires some additional calculations. Thanks again

Maybe nevermind, it looks like it is commonly produced? B16.5 is a dimensional spec only, correct? It is somewhat confusing that we call out material from ASTM for a ASME part. I would still like some clarification, if anyone has sort of a decision tree / selection process summary..

Hi, Simply put, I have a compressor casing that needs a weld neck flange. Construction is per ASME VIII. THe casing is 410 CA6NM. I was looking thru our company's specs and noticed we don't have any martensitic stainless weld neck flanges called out (I was looking for 410). I start looking...

Hi, I'm working on my first WPS / PQR and it started me down a path of Codes and Standards. And, as with most things, the more I learn the more I don't know. I work with a company building Oil Free Screw compressors. Below is what I 'think' is the flow direction of construction standards, is...

It's also fair to point out that you start with the simplest method: pure urea. After you are comfy, you can start attempting to work with more complicated materials, like urine, to replace the more expensive urea. You have to start somewhere.

https://link.springer.com/article/10.1007/s00253-016-7370-6 It's being studied quite a bit. Don't quote me, but I think that concrete production accounts for 5% of the greenhouse gases added to the atmosphere annually. Even a small decrease in the energy required would be a big win.

I recognize that it creates CO2 / greenhouse gases. It 'may' create less than normal concrete manufacture. A cradle to grave would need to be done.

You can't make up your own mind on a topic you aren't trained in / have no knowledge of!! Imagine if you were in your college materials engineering class again and you told the professor that the textbook was full of trash. Wouldn't that be arrogant? To claim an entire field you know...

Geo, Global warming potential means the amount of heat that molecule can trap, but doesn't take into account any other effects? Like the article mentioned above, NOx has the ability to react and leave OH-, which helps break down CH4. After all the costs and benefits are taken into account, is...

Frustrating, but for some reason all the links to the IPCC report concerning NOx is giving a 404 error.

It sounds complicated, but this suggests that NOx is overall bad for the environment: Wikipedia: The direct effect of the emission of NOx has positive contribution to the greenhouse effect.[28] Instead of reacting with ozone in Reaction 3, NO can also react with HO2· and organic peroxyradicals...

Hi, About 6 months ago, I learned about the possibility of a microbe that uses urea, carbon dioxide, and calcium to create Calcium Carbonate. It's an interesting microbe because it could help to sequester CO2 in the air. Problems of Cradle to Grave carbon cycles probably make it a bad...

Lol, in this thread I've learned that politicians know more about climate change than the people studying it. https://en.wikipedia.org/wiki/Greenhouse_effect Some of the deniers on here should go thru the above link and cite their sources as they discredit the entire wiki page on how global...