Re: [PSUBS-MAILIST] Acrylic Pressure Vessels

["" <indyair@iquest.net>]

Hugo,
Thanks for answering, good points for sure. I will search about the JSL sub. 
There just seems to be something about sitting in a bubble : )

Steve

Quoting Hugo Marrero <hmarrero@hboi.edu>:

> Hi Steve,
> 
> You assummed correctly! The JSL sub sphere is all acrylyc and is rated to
> 3000 ft. While it is a great material to build a p-sub, our sphere costs us
> a whoping $120K, pressure tested and delivered. For a psub to 150 ft you are
> looking at least $50K. The lead time can be up to a year from the time you
> order it. Acrylic is adversely affected by uv light causing hazing,
> discoloration and crazing. It is a very soft material and scratches very
> easily, and once scratch it is expensive to repair. Acrylic is also very
> intolerant of high temperatures, and certain solvents, both of which will
> severely weaken the material's strenght.
> 
> For ABS approved design, acrylic viewports and hulls are placed out of
> commission after 10 years for flat viewports and 20 years for hemispherical
> viewports and spheres. This is whether they are in service or not. This is
> due to the lack of existing data to substantiate a longer service life. They
> can also expire after a pre-determined number of pressure cycles before the
> 10 or 20 year time allowance.
> 
> 
> regards,
> 
> Hugo
> 
> 
> 
> 
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