[PSUBS-MAILIST] inside ballast

[Sean T. Stevenson via Personal_Submersibles]

Also, I wouldn't use copper for anything other than domestic water or low pressure air, and even then, it isn't an ideal choice for the marine environment.  ABS requires a rating of four times the operating pressure. I typically use Swagelok seamless tubing in 316 SS, and there are different diameters available to match your flow requirements, and different wall thicknesses available to match your pressure requirements. I use HP Autoclave tubing for the really high pressure stuff (15,000 - 60,000 psi), which is also 316 SS - of course, PSubs should never need such pressures.

Sean



On December 7, 2016 4:59:02 PM MST, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>I'm routing my lines to use two scuba tanks as my internal ballast.  I
>estimate the total weight if they are both filled with water to be
>around 42 lbs.  (about 570 cu in for each, alum 80's)  .  What kind of
>water line does everybody use?  I was considering using soft copper but
>I'm not sure of it's pressure rating.  Or maybe that is not such an
>issue.  It could see some pressure using the HP tanks in a closed
>position, which then could be an issue I guess.   But I would most
>likely just give a little blast of HP air to push the water out.  Hmmm,
>wonder if I should have the option to vent outside the sub if I had
>some air pressure in the ballast tanks?  or I guess I could just simply
>let it push all the water out and then it would get expelled that way. 
> Are there any specific rules like that for inside ballast tanks?
>
> 
>
>Brian
>
>
>
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