[PSUBS-MAILIST] over pressure valve

[hank pronk via Personal_Submersibles]

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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