[PSUBS-MAILIST] Gauge for outside viewport?

Private via Personal_Submersibles personal_submersibles at psubs.org
Mon Sep 21 20:30:29 EDT 2015


Light from inside, it'll be right up against the window.



> On Sep 21, 2015, at 8:09 PM, Pete Niedermayr via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> What about illumination ?
> 
> Pete 
> --------------------------------------------
> On Mon, 9/21/15, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Subject: Re: [PSUBS-MAILIST] Gauge for outside viewport?
> To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
> Date: Monday, September 21, 2015, 6:35 PM
> 
> It would
> go outside one of the CT viewports. Specifically, the one
> that looks back toward the stern and is therefore seldom
> used. The tank pressure is something I normally look at just
> once before a dive. You want to be able to see it if you
> want to, but it's not a frequent-use item I would put
> right in front of the pilot where real estate is most
> precious.
> So far I
> still haven't located a liquid filled SPG. The one
> Stephen suggested is for sale in Germany but I haven't
> located it here yet.
> 
> Thanks,
> Alec
> On Mon, Sep 21, 2015 at
> 7:08 PM, Pete Niedermayr via Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
> Alec,
> Where are you thinking of mounting the gauges ? Outside one
> of the conn viewports ? Outside the dome ? Or 2 sets for one
> each ?
> 
> 
> 
> Pete
> 
> --------------------------------------------
> 
> On Mon, 9/21/15, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
> 
> 
> 
>  Subject: Re: [PSUBS-MAILIST] Gauge for outside
> viewport?
> 
>  To: "Personal
> Submersibles General Discussion" <personal_submersibles at psubs.org>
> 
>  Date: Monday, September 21, 2015, 8:34 AM
> 
> 
> 
>  Exactly.
> 
>  The valves to blow ballast are outside and operated via
> 
>  through-hulls.
> 
>  On Mon, Sep 21, 2015 at
> 
>  8:57 AM, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
> 
>  wrote:
> 
>  >1) I
> 
>  have a bunch of oil filled gauges lying around, but if
> they
> 
>  are left in any position other than with the rubber caps
> at
> 
>  the top, they leak all over the place. The shelf they
> live
> 
>  on is covered with oil, so I'm just not confident
> they
> 
>  will >keep the oil inside in the
> 
>  field. Yes, I suppose so.  The ones
> 
>  I have drip.  I thought i'd sprung a minor hull leak
> at
> 
>  first... >2) Yes,
> 
>  SCUBA tank gauges have a tiny orifice in their hose
> fittings
> 
>  for just that purpose, to prevent a broken instrument
> from
> 
>  emptying your tank too quickly. That is good and I plan
> to
> 
>  use it on the sub as well. However, the problem
>> still
> 
>  persists that SCUBA gauges can only be taken to under
> 500
> 
>  feet. I came across tech diver accounts of gauge issues
> such
> 
>  as the plastic faces buckling and pinning the needle, or
> the
> 
>  whole enclosure imploding at about 400
> 
>  >feet.  oh.  Are you not having
> 
>  the HP lines inside the sub at all?  Controlling the
> air
> 
>  with a through hull? 
> 
>  RegardsJames
> 
>  On 21 September 2015 at
> 
>  13:20, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
> 
>  wrote:
> 
>  Hi James,
> 
>  1) I
> 
>  have a bunch of oil filled gauges lying around, but if
> they
> 
>  are left in any position other than with the rubber caps
> at
> 
>  the top, they leak all over the place. The shelf they
> live
> 
>  on is covered with oil, so I'm just not confident
> they
> 
>  will keep the oil inside in the field.
> 
>  2) Yes, SCUBA tank gauges have a
> 
>  tiny orifice in their hose fittings for just that
> purpose,
> 
>  to prevent a broken instrument from emptying your tank
> too
> 
>  quickly. That is good and I plan to use it on the sub
> as
> 
>  well. However, the problem still persists that SCUBA
> gauges
> 
>  can only be taken to under 500 feet. I came across tech
> 
>  diver accounts of gauge issues such as the plastic
> faces
> 
>  buckling and pinning the needle, or the whole enclosure
> 
>  imploding at about 400 feet. 
> 
> 
> 
>  Thanks,
> 
>  Alec  
> 
>   
> 
>  On Mon, Sep 21, 2015 at
> 
>  5:03 AM, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
> 
>  wrote:
> 
>  Hi Alec, I have a
> 
>  couple of thoughts.   1.  The
> 
>  gauges I have are chemical protected, so they have an
> oil
> 
>  filled diaphragm separating the inlet line from the
> gauge
> 
>  internals.  Then there is a small vent hole at the top
> of
> 
>  the gauge.  You could attach a rubber hose\bladder
> to
> 
>  this vent hole, top it up with glycerine or whatever
> the
> 
>  gauge is filled with and have a fully compensated valve
> with
> 
>  a bladder. 2.  How about using just
> 
>  a normal scuba gauge which will probably be perfectly
> 
>  fine.  But, just make a small adapter that screws onto
> the
> 
>  gauge and has only a tiny little orifice to allow the
> input
> 
>  air.  That way if the gauge did ever fail, it would
> only
> 
>  bleed out air slowly and you'd have time to blow
> 
>  tanks.  If you are using a scuba 1st stage and piping
> from
> 
>  the HP port (I assume your not and are plumbing
> straight
> 
>  into tanks) then the scuba HP already has this small
> hole
> 
>  for the same reason. Also, it would
> 
>  be easy enough to test a gauge.   Find somewhere deep
> 
>  enough and take a fishing rod and a packed
> 
>  lunch! Im fairly sure Emile has
> 
>  external gauges on his sub and its a 200m diver.  He
> could
> 
>  maybe advise? Just a thought.
> 
>  Kind Regards
> 
>  James  
> 
>  On 21 September
> 
>  2015 at 06:51, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
> 
>  wrote:
> 
>  Hi Alec,    New sub ? 
> 
>  I must have missed that !    do you have any
> 
>  details?    BTW, I received that big gage ! 
> It's
> 
>  huge !  I hope I can get it in through the hatch !  
> As
> 
>  it is designed for sea water I assume all I have to do
> is
> 
>  plumb it in, will salt water getting into the tubing
> cause
> 
>  any problems?   Brian
> 
> 
> 
>  --- personal_submersibles at psubs.org
> 
>  wrote:
> 
> 
> 
>  From: Alec Smyth via
> 
>  Personal_Submersibles <personal_submersibles at psubs.org>
> 
>  To: Personal Submersibles General Discussion
> 
>  <personal_submersibles at psubs.org>
> 
>  Subject: [PSUBS-MAILIST] Gauge for
> 
>  outside viewport?
> 
>  Date: Sun, 20 Sep
> 
>  2015 23:03:02 -0400
> 
> 
> 
>  I have an
> 
>  interesting thing to think about and wondered if any of
> the
> 
>  PSUBS brain trust might have a suggestion.
> 
>  One of the simplifications on my new
> 
>  sub is that all HP air lines are external, aside from
> the
> 
>  BIBS (which is normally shut off anyway). Thus, I'm
> 
>  looking for a 3,000-4,000 psi gauge to mount outside a
> 
>  viewport, like in the Pisces photo that I'll paste
> 
>  below. In case my paste doesn't come through, it is
> the
> 
>  one at the top of the following article: http://www.nytimes.com/2015/09/15/science/piloted-deep-sea-research-is-bottoming-out.html?_r=1
> 
>  The first thing that came to mind
> 
>  was to use a SCUBA submersible pressure gauge, but the
> 
>  problem is these are normally 1 atm dry enclosures of
> 
>  limited depth rating. There is generally little
> information
> 
>  posted about how deep they'll go, but what I did
> find
> 
>  was mentioned 260 feet for the plastic ones and 490 feet
> for
> 
>  the brass variety. This is a 1,000 foot sub.
> 
>  The second idea was to use oil
> 
>  filled gauges intended for above-water use. But these
> 
>  generally have considerable bubbles in the oil, are not
> very
> 
>  good at keeping the oil inside, and have other hardware
> not
> 
>  intended to live long in sea water.
> 
>  Any suggestions would be most
> 
>  welcome!
> 
> 
> 
> 
> 
>  Thanks,
> 
>  Alec 
> 
> 
> 
> 
> 
> 
> 
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