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Brian, As Sean stated, the PVHO document is copyright protected so we cannot post it on the website. For what it's worth, I purchased the document back in early spring and found it to be seriously lacking in content so I requested and received a refund. The document can essentially be divided into two topics, viewports and everything else. If you have Stachiw's Handbook of Acrylics, you don't need ASME PVHO for anything related to viewports since the subject matter is identical. In fact, Stachiw's book is superior here because it includes detailed descriptions of fabrication, his methods and experiments, rather than ASME PVHO which only provides you with the standard. Also note that Stachiw was chairman of the subcommittee creating standards for viewports at ASME. As far as "everything else" in relation to fabrication of the pressure hull, 95% of ASME PVHO points you to ASME BPVC for specific information, formulas, and documentation. The ASME BPVC (Boiler and Pressure Vessel Code) is a huge document which costs $600 or more. In my opinion, the ASME PVHO document should be edited and re-marketed as ASME PVHO Viewports because that is about the only information within it which is self-contained and does not require purchasing a separate and more expensive document. For example, I purchased ASME PVHO when I was working on hull opening reinforcement and window seat thickness requirements but the document had nothing to offer here except that fabrication must comply with ASME BPVC. If you have Manned Submersibles (free online), Stachiw's Handbook of Acrylics, and ABS Standards (free online), then I think you have everything you need for a home-built sub that is not intended for classification. Jon On 11/3/2010 1:51 AM, Brian Cox wrote:
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