[PSUBS-MAILIST] Fw:

[Stephen Fordyce via Personal_Submersibles]

Sounds like a good plan Hank, brilliantly simple!
On 20/09/2015 10:44 PM, "hank pronk via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

> Steve,
> There is no over pressure valve in the traditional sense.  I will secure
> the hatch with rubber straps, the same as what holds a Jeep hood down.  If
> there is an over pressure it will burp out the hatch.  That is the plan for
> now at least.   When I return from the deep test, I plan to build a test
> pool also.
> Hank
>
>
>
> On Saturday, September 19, 2015 8:01 PM, Stephen Fordyce via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Hank,
> I knew there would be a bunch more behind it:).
> Is there an over pressure valve though?
> Cheers,
> Steve
> On 20/09/2015 7:24 AM, "hank pronk via Personal_Submersibles" <
> personal_submersibles at psubs.org> wrote:
>
> Hi Steve,
> I did not mention that the hatch will have two valves to act as a snorkel,
> in case there is a problem with the bladder and I can not open the hatch at
> the surface.
> I have the same thoughts you mention about the bolts  in some situations,
> e.g., if I want to get out in a hurry because a leak is developing.
> I went this way because it is bullet proof and quick and easy to build.  I
> do think about it a lot so I may change it to remove the bolts from inside
> the pod where it is safe.
> If the sub and pod are at a great overpressure, I can deal with that by
> pumping air out with my hp compressor, I would just dump the air overboard.
>
> Also it takes very little depth to hold the pod in place with the bolts
> removed.  At a depth where the pod could fall off, I could just swim out of
> that scenario.
> Hank
>
>
>
> On Saturday, September 19, 2015 3:04 PM, Stephen Fordyce via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Hank,
> That is admirably simple, especially the bit about the pressure holding it
> on after you undo the bolts.
> I wonder though did you consider the scenarios of a partly or fully
> pressurised sub as you are escaping?  (I'm curious as to what valves are
> included for the escape pod) Highly unlikely really, but then so is having
> to use the escape pod - here are some specific cases I can think of.
> 1. There is a slight vacuum in the pod on surfacing (sucking hatch closed)
> 2. There is a slight overpressure in the pod on surfacing (blowing hatch
> open)
> 3. There is a major over-pressure during ascent (ie. Sub and pod were
> partly or fully at ambient before escape). Main implication is blowing the
> hatch, but if you were actually at ambient it would be incredibly tragic if
> the pod fell off due to lack of pressure holding it on.
> Cheers,
> Steve
>
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