RE: [PSUBS-MAILIST] Open Discussion's Allowed in PSUB's Mailing List

[Brent Hartwig <brenthartwig@hotmail.com>]

Thank you Jon for the data you provided. 
 
That is exactly the detailed and thought out kind of data I and others are after. Some times I'm looking for little bit of a short cut in finding an answer to a question, and in many areas of the field of submarines one just has to do allot more detailed research to even get to a point they can start to put it all together. I just had to start to break everything down into different subjects and archive data I felt was good in those different files, so I can quickly refer back to them when the need arises. My archive is getting bigger every day.
 
My poor mother was my teacher for a couple of years, and I would ask her a question on a academic item I knew she must know, and she wouldn't tell me the answer(s). She wanted me to find it for myself, and I used to hate that. But it made me more self reliant, so that means she was a great teacher. Here it's a bit different, there's not as much of a need to hold back information one knows, not that discovering it for yourself along with loads of other supporting data isn't important as well in ones educational growth.
 
I didn't mean for it to come off like I didn't think the Stachiw book wasn't worth every bit of $200, I was just trying to explain my thought process of why I went ahead and asked the question, even though I hadn't done all the research knew I could of done in time. I have a long list of questions much like that one, but on all sorts of different subjects that I think I haven't done even my basic Google research on, so I don't waste the groups time with them. So I believe I am being measured in my questions for the most part.
 
Now the Stachiw book has been moved up to the top of my list of things to acquire, read, and understand. The heck with the new $325 triple shade Speedglass auto darkening helmet, who needs a helmet to weld anyways, just turn your head and do it by brail while you read the Stachiw book. ; )' 
 
Just kidding guys I use a helmet, just not the one I want. Even though I have an Uncle that sometimes MIG welds like that, with his head turned. The man is good at welding, I'll give him that.

Regards,
Brent Hartwig

> From: jon@psubs.org
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Open Discussion's Allowed in PSUB's Mailing List
> Date: Wed, 22 Aug 2007 21:10:20 -0400
> 
> Hi Brent,
> 
> After hearing Dr. Joan Stachiw say it in person, and reading it myself in Dr. 
> Jerry Stachiw's book, I can tell you with certainty that ASME PVHO standards 
> require annealing for any acrylic component whose surfaces were machined, 
> sanded, and/or machine polished. Now that I have the book myself, I can even 
> give you a reference; 15.2.3 Annealing, Page 837, "Handbook of Acrylics for 
> Submersibles, Hyperbaric Chambers, and Aquaria".
> 
> In my opinion, Stachiw and ASME PVHO, are synonymous. Stachiw served within 
> ASME and wrote many (most?) of the standards regarding acrylic viewports 
> because of his extensive research with the material. If I'm wrong, someone 
> correct me, but I believe this is true.
> 
> You are correct that Stachiw's book does not specifically reference water jet 
> cutting acrylic and his book may be "dated" in that respect. However, he 
> constantly refers the reader to the latest ASME PVHO standards which we 
> assume are updated when new procedures are tested, qualified, and adopted by 
> that organization. If water jet cutting acrylic viewports is not singled out 
> in the current ASME PVHO standard (I don't have a copy of it), then we can 
> assume that the more general description of "machined" applies and annealing 
> is required when building to ASME PVHO specs.
> 
> So you see, your question would have been answered in that $200.00 book 
> because you would have been pointed to the latest ASME PVHO specs. You could 
> have then read those specs to determine if annealing after water jetting was 
> an exception. The reason you sometimes get "pat" answers on this forum, is 
> because someone might have already done that research and is merely giving 
> you the "answer" you seek in the most forthright manner they know how.
> 
> If you are suspect of the credentials of those that might respond to your 
> questions, then you should either target your question to that person to whom 
> you do trust; or purchase the Stachiw book/ASME PVHO standards so that you 
> can find the answer yourself. After all, if you can't trust yourself, who 
> can you trust?
> 
> Jon
> 
> > I once posted a question about
> > whether or not I needed to anneal acrylic, if I only cut it with a aqua jet
> > cutter. Since I had reason to believe the aqua jet cutting process wouldn't
> > put any heat stesses on the acrylic that would need annealing to take care
> > of. I did a PSUB's archive search before I posted my question. Along with
> > the speculation that my question wouldn't be answered in a great but
> > slightly dated $200 book, (I hadn't aquired yet) since I believed aqua jet
> > cutting of acrylics was basicly a new process, I asked the question. I got
> > the patt answere of that, all acrylic needs to be annealed after cutting,
> > in such a way I couldn't tell if they really knew that, with regards to my
> > question, or if they just didn't want to deal with it. 
> 
> 
> 
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