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Re: [PSUBS-MAILIST] Questions for Phil..

Cool.  BTW: a good friend wrote to let me know I was leaving something out of this discussion:
 
ABS requires pressure vessels for human occupancy to have a minimum of 72 hours life support capability.
 
USCG requires that pressure vessels for human occupancy, used for passenger service or charter, be ABS certified and USCG inspected on a yearly basis.
 
There is no life support requirement for private use, nor do private vessels need to be ABS certified.
 
So PVHO only matters if one wants to get his boat certified, which might not be a concern for the guy making a homebuilt sub.  And none of this has anything to do with the folks driving ambient or wet subs.
 
Whew!
 
Pat
 
 
----- Original Message -----
From: Alec Smyth
To: 'personal_submersibles@psubs.org'
Sent: Friday, August 10, 2001 8:35 PM
Subject: RE: [PSUBS-MAILIST] Questions for Phil..

127 pages
-----Original Message-----
From: Captain Nemo [mailto:vulcania@interpac.net]
Sent: Friday, August 10, 2001 4:27 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Questions for Phil..

$150.  Yeah, that's what I remember it being the last time it was discussed here.  Guess I'm going to spring for one.  BTW: how many pages?
 
And thanks for the tip-off about the other documents; guess I'll order them at the same time.  Still, in the meantime, I'll echo your plea for anyone having those references to please share the pertinent information with everyone.
 
VBR,
 
Pat 
 
----- Original Message -----
From: Alec Smyth
To: 'personal_submersibles@psubs.org'
Sent: Friday, August 10, 2001 5:57 PM
Subject: RE: [PSUBS-MAILIST] Questions for Phil..

I bought it, and it cost around $150. That might seem pricey for a few loose pages, but for those unfamiliar with this ASME publication, it contains really valuable (I would even say essential) information for designing acrylic viewports. I strongly recommend it to anyone designing or building their own viewports. 
 
PVHO is 99% about viewports and piping. The reference to welding is so small I'll transcribe some of it below. I want to clarify I am not really certain of what it is saying for lack of the referenced documentation.
 
"1.4.1 Joint Design. All PVHOs shall be designed with joints as follows.
 
(a) All joints of categories A, B, and C shall be Type No 1 of Table UW-12 for Division 1 vessels or shall comply with AF-221 for Division 2 vessels, except as permitted in (c) below.
 
(b) All joints of Category D shall be full penetration welds extending through the entire thickness of the vessel or nozzle wall. Backing strips shall be removed.
 
(c) ..."
 
I don't know what those joint categories are, but I am assuming D would be the critical ones. Neither do I have table UW-12. I think all this stuff is in Section VIII, a different ASME publication which I don't yet have my hands on. Perhaps someone with Section VIII handy can educate the rest of us on these items?
 
 
rgds,
 
- Alec
-----Original Message-----
From: Captain Nemo [mailto:vulcania@interpac.net]
Sent: Friday, August 10, 2001 3:34 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Questions for Phil..

Hi Alec!
 
That's really good  news.  I use the electrodes a lot; did on my NAUTILUS, too.  A couple years ago somebody on this forum said that was contrary to PVHO, and said continuous feed was required.  I didn't have a copy, so there wasn't much I could say.  But if such is not the case, I for one am glad to hear it.
 
BTW:  Where did you get ahold of the PVHO at?  Borrow it?  Or if you bought it, how much does it cost now?
 
VBR,
 
Pat
 
----- Original Message -----
From: Alec Smyth
Sent: Friday, August 10, 2001 12:51 PM
Subject: RE: [PSUBS-MAILIST] Questions for Phil..

Pat,
 
I just checked the current PVHO. It specifies full-penetrations welds, but doesn't tell you what welding technique to use.
 
rgds,
 
- Alec