[PSUBS-MAILIST] cable fittings

Fri Jun 19 09:48:26 EDT 2020

Brian

Not sure to tell you the truth. I may be calling it the wrong thing. The
Blue Globe fittings that others have mentioned is what I want and I have a
call out to the Vendor that carries that German fitting to see if I can get
it in a 3/8" NPT for the rating that I want. Also reaching out to Contaclip
as Sean and some others have mentioned. I was going to do a test today on
the SealCon fittings that I bought a few years ago that have a 10 bar
rating to see at what pressure they extrude but wasn't able to.
Hopefully tomorrow. I'll let ya know the results.
Rick

On Fri, Jun 19, 2020 at 5:55 PM Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Rick,         Isn't there a difference between strain relief and just a
> straight compression fitting ?
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] cable fittings
> Date: Fri, 19 Jun 2020 03:20:56 -1000
>
> Brian
> sorry I didn't answer sooner as been crazy. I will be passing a
> depth sounder wire, a UTC underwater comms transducer wire, a VHF
> radio antenna cable and LED lights which is about 5/16" diameter with 4
> insulated wires inside of it.
>
> Rick
>
> On Mon, Jun 15, 2020 at 10:41 AM Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Rick,         What are you trying to run through there?
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] cable fittings
> Date: Mon, 15 Jun 2020 06:50:04 -1000
>
> Just called Sealcon to confirm how they rate their strain relief fittings
> and they base it on line pull so the ones I have won't work. they said that
> they also sell a cable clip that attaches to the cable on the pressure side
> to keep it from extruding so I might but one of them and do some testing to
> see if this will be an option or not.
> jRick
>
> On Tue, Jun 9, 2020 at 6:00 AM Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Ian,
>
> https://www.macartney.com/what-we-offer/systems-and-products/connectors/subconn/
> I'm not sure how you get Psub discount. I got some through Jon the
> facilitator / owner
> of the group a long time ago.
> He normally reads the emails & will comment if you have a question.
> There may be an email link to Jon, or more info on the Psub web site.
> He's based in NY, so just a submarine ride away!
> Cheers Alan
>
> On 10/06/2020, at 1:07 AM, Ian Juby via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> :O  That's them!  Subcon eh? I'll look them up. Psubs gets a discount? How
> does that work?
>
> Ian
>
>
> On Mon, Jun 8, 2020 at 6:46 PM Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Thanks Ian,
> I have those type of penetrators (below). Psubs gets a discount from
> subConn
> that makes them.
> Would be a bit difficult making them yourself & the bought ones have a
> securing
> device so they can't pull apart ( orange thing in photo).
> I agree that there wouldn't be much call for wet mating them, & that it
> would just
> be an opportunity for corrosion.
> Alan
>
> <image1.JPG>
>
> On 9/06/2020, at 5:43 AM, Ian Juby via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi Rick,
> I saw your post and wanted to ask if you meant electrical or plumbing
> through hull connections. So I'm glad you reposted because I haven't been
> able to follow the thread, nor have I had the time to go back and look
> stuff up.
> When I was working R&D on our diver heater system, we used a watertight
> bulkhead connector for the shot line and remote control. Unfortunately,
> this was over 20 years ago and I was not the one who actually ordered the
> connector. So I innernets'd some pictures to try and hopefully find it
> again because I remember quite well what it looked like, its design and
> construction. The closest thing I could find was Teledyne Marine's "Wet
> mate" connectors:
> http://www.teledynemarine.com/electrical-wet-mate-connectors/
> I couldn't tell you the price, but I'm sure they weren't cheap. For my ROV
> project, I'm still in the rough design phase and I keep increasing its
> depth capabilities. So I'm just going to make my own through-hull
> connectors, and they will be similar to this design.
> The through-hull seal is accomplished by a simple and reliable o-ring
> (which doesn't appear in teledyne's picture). Basically, the rubber
> connector body is mounted to a brass threaded tube that goes through the
> bulkhead. The brass threaded tube has a seat for an o-ring which gets
> compressed by both the nut and external water pressure. Here, I drew a
> pretty picture:
>
> <bulkhead connector.jpg>
> I just realized I didn't mark the brass tube, but it's the part that goes
> through the bulkhead.
> The particular connector we were using only needed to go to like, 300
> feet. I believe we tested the heater unit to 300 psi and ironically, it was
> the swagelock fittings inside the unit that leaked - that electrical
> connector never leaked. We had I think 8 electrical connections passing
> through that? We could get the identical connector as a straight-through
> connector, and not an angled connector like my drawing.
> The pins and sockets were the solid style - in other words there was no
> splits to allow for expansion or contraction of the sockets or pins. This
> further added to the waterproof nature as now the wire (a possible leak
> point) was buried in solid rubber, behind a solid metal socket which itself
> was buried in solid rubber. Any water wicking along would have to travel
> 1/2" along the metal/rubber just to get past the socket.
> The connector body was a hard rubber, both the through-bulkhead block and
> the male connector. Under high pressures, the water can wick along the
> inside of the wires (between the copper and the outer insulation) or if you
> pass the wire through say, silicone rubber, it can wick along the junction
> of the outside of the wire and the encasing rubber. So the longer that
> travel distance is, the higher the pressure needs to be to force water
> through those avenues. That rubber block was only maybe 2 inches left to
> right in my drawing. I don't remember what pressures or depths it was rated
> for, but I guarantee you it could take a LOT of pressure. Mechanically
> (because the bulkhead hole was small) and in keeping watertight. The
> biggest risk for a leak was if the bulkhead got a scratch where the o-ring
> seated against it. I have no doubt that connector could have taken
> hydraulic pressures (thousands of PSI).
> I did not draw this in my pretty picture, but the head of the brass tube
> probably had multiple rings inside the rubber, both to get good mechanical
> locking between the rubber body and the brass body, and to make the
> greatest distance the water would have to travel to get around from outside
> to inside the tube, if it were to wick along the junction between brass and
> rubber. But I'm speculating there because I didn't cut one of those
> connector$ open to find out. Lest I get fired and stuff for destroying a
> connector worth hundreds of dollars, you know.  :D Just, when I go to make
> my own connectors, I'll be making the mounting tube like that, for those
> reasons. The rubber that made up the connector body filled everything,
> including right to the bottom of the brass tube.
> The nice thing about making your own connector as well is that you can
> make the electrical pins, sockets and wires any size you want to match your
> electrical current needs.
>
> These particular connectors could be plugged and unplugged underwater, but
> I suspect it would be very difficult to do as it would have to displace
> water or vacuum from the connector holes. But as you can see, the male pins
> had insulating rubber for a part of their length to maximize the distance
> the electricity would have to travel from pin to pin, thus maximizing the
> electrical resistance from pin to pin as well.
> Hope that helps,
> Ian
>
>
> On Mon, Jun 8, 2020 at 12:09 PM Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> I posted the other day about cable threw hull water tight fittings and
> only got one response back and was hoping for more feed back as I know most
> of you probably don't make your own so for the ones that buy them, is Blue
> Globe the only player out there besides sealcon?
> Thanks
> Rick
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