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Re: [PSUBS-MAILIST] Service Life vs. Design Life of Acrylic Windows
Hi Brent,
A perfect safety record, as referenced by Stachiw, is the record of ASME
PVHO-1 pertaining to viewports (which is the subject of his book). You
are of course free to take whatever approach you want toward building
your own submarine. The only issue I see with your logic is that "the
most convincing data" available is likely already encompassed within ABS
and ASME.
Jon
Brent Hartwig wrote:
Hi Jon,
I'm not one to throw out the baby with the bath water, sort
speak. The PVHO, ABS, and other standards have been put together with
many thousands of hours of hard work, calculations and testing. What
I see Stachiw doing there was part of the push pull aspect that is
required to develop a standard. Whether it makes it better, or worse,
it's part of the process. Unless one is required to go by a
particular standard to be able to have there sub function in a
particular way, for a particular purpose, we are able to choose what
rules, if any we choose to use. For many of use we are lucky we don't
have to have are subs ABS classed or we would be forced to watch from
the sidelines.
For me I choose to use PVHO, and ABS as a tool, not a bible, and if I
find other data that is different then PVHO or ABS from sources like
Stachiw, Moorhouse, Nuytten, or the like, I will go with the one that
I find to have the most convincing data.
What entails a perfect safety record? I know of a 48 passenger ABS,
PVHO certified tourist sub, that a local friend of mine was a key part
of building in Seattle , called the Voyager that used
to operated in Hawaii, that had a hydrogen explosion on it,
that seriously injured two of the crew that came into the sub in the
morning to get it ready for the day, after charging the batteries over
night. There was a problem with the battery bank venting system and
the hydrogen built up under the floor plates enough that when the
static spark set it off from the two men walking around inside, the
explosion a cured, and the floor lifted up so fast it injured the
men. There is a chance the company didn't report it or that sub might
of been required to got through a complete over haul.
*
Regards,*
*Szybowski*
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