[PSUBS-MAILIST] over pressure valve

[Alec Smyth via Personal_Submersibles]

I don't get the "in the hands" part... its completely automatic.

On Fri, Jun 19, 2015 at 4:09 PM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

>
> Agreed,
> In the hands of an experienced submarine operator an over pressure valve
> is safe, providing it is large enough.  I have not seen an example of a
> large enough OPV.  A simple valve in the hatch will do the same job, just
> need an umbrella :-)
> The noise of a compressor is a welcome sound if it means keeping the dome
> on the sub :-)
> Hank--------------------------------------------
> On Fri, 6/19/15, Carsten Standfuß" via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>  Subject: Re: [PSUBS-MAILIST] over pressure valve
>  To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
>  Received: Friday, June 19, 2015, 2:47 PM
>
>  But a overpressure vale works
>  full auto. A compressor
>  not.
>
>  A OPV needs
>  no energy - but a compressor did.
>
>
>  A OPV needs no room - but
>  a compressor did.
>
>  And a
>  compressor is
>  a noisy solution..
>
>  vbr
>  Carsten
>
>
>
>  "hank
>  pronk via Personal_Submersibles" <personal_submersibles at psubs.org>
>  schrieb:
>  > Personally I think an onboard
>  compressor is a much safer option than an over pressure
>  valve.  There are multiple safety benefits to an onboard
>  compressor, over pressure being the biggy.  With a
>  compressor you can get rid of the pressure without surfacing
>  and trying to control a perfect ascent.  With the OPV you
>  have to surface a bit and let air out and wait then surface
>  more and wait and so on. You can't just surface and hope
>  the valve keeps up with the demand. This is more important
>  for subs with large domes.
>  > The next
>  benefit to a compressor is, if you lost all your air, you
>  surface by dropping your weight.  In my case the weight is
>  small and I would also drop the thruster and tail assembly.
>  Still, not much sub out of the water.  With the compressor,
>  I can open my vent valve in the hatch and use the compressor
>  to fill the ballast tanks.
>  > Hank
>  >
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