[PSUBS-MAILIST] Gauge for outside viewport?
Alan James via Personal_Submersibles
personal_submersibles at psubs.org
Wed Oct 7 01:13:10 EDT 2015
I saw some oil filled pressure gauges today.The oil only went 3/4 or so up the dial face.I asked why it didn't completely fill the inside, but the sales person couldn't tell me.We surmised that the purpose of the oil was as a buffer in case of explosion.So if you find an oil filled gauge it is not necessarily going to be full or pressureresistant.Cheers Alan
From: Private via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Tuesday, September 22, 2015 12:30 PM
Subject: Re: [PSUBS-MAILIST] Gauge for outside viewport?
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
>
>
>
>
>
>
>
> --089e0115ebd0a0d2500520391e8b--_______________________________________________
>
> Personal_Submersibles mailing list
>
> Personal_Submersibles at psubs.org
>
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
> _______________________________________________
>
>
>
> Personal_Submersibles mailing list
>
>
>
> Personal_Submersibles at psubs.org
>
>
>
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
>
>
>
> Personal_Submersibles mailing list
>
>
>
> Personal_Submersibles at psubs.org
>
>
>
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
>
>
>
> Personal_Submersibles mailing list
>
>
>
> Personal_Submersibles at psubs.org
>
>
>
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
>
>
>
> Personal_Submersibles mailing list
>
>
>
> Personal_Submersibles at psubs.org
>
>
>
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
>
>
>
>
>
>
> -----Inline Attachment Follows-----
>
>
>
> _______________________________________________
>
> Personal_Submersibles mailing list
>
> Personal_Submersibles at psubs.org
>
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
>
>
> _______________________________________________
>
> Personal_Submersibles mailing list
>
> Personal_Submersibles at psubs.org
>
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
> -----Inline Attachment Follows-----
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20151007/82957af7/attachment-0001.html>
More information about the Personal_Submersibles
mailing list