[PSUBS-MAILIST] Gauge for outside viewport?
Alec Smyth via Personal_Submersibles
personal_submersibles at psubs.org
Mon Sep 21 19:35:40 EDT 2015
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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