<div dir="ltr">I don't get the "in the hands" part... its completely automatic.</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jun 19, 2015 at 4:09 PM, hank pronk via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Agreed,<br>
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 :-)<br>
The noise of a compressor is a welcome sound if it means keeping the dome on the sub :-)<br>
Hank--------------------------------------------<br>
On Fri, 6/19/15, Carsten Standfuß" via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
Subject: Re: [PSUBS-MAILIST] over pressure valve<br>
To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Received: Friday, June 19, 2015, 2:47 PM<br>
<div><div class="h5"><br>
But a overpressure vale works<br>
full auto. A compressor<br>
not. <br>
<br>
A OPV needs<br>
no energy - but a compressor did.<br>
<br>
<br>
A OPV needs no room - but<br>
a compressor did.<br>
<br>
And a<br>
compressor is<br>
a noisy solution..<br>
<br>
vbr<br>
Carsten<br>
<br>
<br>
<br>
"hank<br>
pronk via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
schrieb:<br>
> Personally I think an onboard<br>
compressor is a much safer option than an over pressure<br>
valve. There are multiple safety benefits to an onboard<br>
compressor, over pressure being the biggy. With a<br>
compressor you can get rid of the pressure without surfacing<br>
and trying to control a perfect ascent. With the OPV you<br>
have to surface a bit and let air out and wait then surface<br>
more and wait and so on. You can't just surface and hope<br>
the valve keeps up with the demand. This is more important<br>
for subs with large domes.<br>
> The next<br>
benefit to a compressor is, if you lost all your air, you<br>
surface by dropping your weight. In my case the weight is<br>
small and I would also drop the thruster and tail assembly.<br>
Still, not much sub out of the water. With the compressor,<br>
I can open my vent valve in the hatch and use the compressor<br>
to fill the ballast tanks.<br>
> Hank<br>
><br>
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