[PSUBS-MAILIST] over pressure valve

[hank pronk via Personal_Submersibles]

You have to be experienced to surface slowly and hover while the valve leaks out the air.--------------------------------------------
On Fri, 6/19/15, Alec Smyth 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, 4:16 PM
 
 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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